Mauritius Meteorological Services

Transcription

R E P U B L I C O F MA U R I T I U S
METEOROLOGICAL SERVICES
MONTHLY BULLETIN
of
CLIMATOLOGICAL SUMMARIES
May 2008
August 2008
Contents
Introduction
1-2
Map of Mauritius / Area of responsibility
3
Weather Summary
4
Rainfall in Mauritius
5-10
Mean Monthly Rainfall
11
Rainfall Analysis
12
Monthly Climatological Summaries
13
Monthly Agrometeorological Summaries
14
Monthly Synoptic Summaries
15
Mean Sea Surface Temperature
16
Surface Wind Rose
17
Upper Winds Observations
18
MONTHLY CLIMATOLOGICAL SUMMARIES
for
MAURITIUS, RODRIGUES AND OUTER ISLANDS
1. INTRODUCTION
Mauritius lies between Latitudes 19º58.8' and 20º31.7' South and Longitudes 57º18.0' and 57º46.5' East.
Rodrigues lies between Latitudes 19º40' and 19º46' South and Longitudes 63º20' and 63º30' East about 650
km East of Mauritius. St. Brandon is a coral atoll situated around Latitude 16º27' South and Longitude
59º37' East about 450 km to the North-North-East of Mauritius. Agalega consists of two small islands
between Latitudes 10º20' and 10º29' South and Longitudes 56º34' and 56º42' East, about 1050 km almost
North of Mauritius.
Monthly climatological data presented in this issue are based on daily observations of various meteorological
parameters recorded in Mauritius, Rodrigues, St. Brandon and Agalega.
2. STATIONS
Synoptic Stations
Synoptic stations are meteorological weather observing centres where all meteorological parameters are
being monitored at fixed intervals of time and their observations are exchanged on the Global
Telecommunication System of the World Meteorological Organisation.
The Mauritius Meteorological Services maintains six synoptic stations :
Vacoas (20º18'S, 57º30'E) WMO Station number 61995, and Plaisance (20º26'S, 57º41'E) WMO Station
number 61990, in Mauritius. Pointe Canon (19º41'S, 63º25'E) WMO Station number 61988 and Plaine
Corail (19º41'S , 63º45'E) WMO Station number 61989, in Rodrigues. Raphael Island, located at 16º27'S
and 59º37'E WMO Station number 61986, in St Brandon. Agalega located at 10º21'S 56º35'E, WMO
Station number 61974, in North Island.
Climatological Stations
Ordinary climatological stations are stations where climate parameters such as extreme temperatures and
amount of precipitation are recorded and including, if possible, some other elements like atmospheric
pressure, humidity, soil temperatures, sunshine and wind are monitored daily for the preparation of
climatology. The Mauritius Meteorological Services has a network of 22 ordinary climatological stations in
Mauritius.
Agrometeorological Stations
The agrometeorological stations monitor standard climatological data that are of interest to agriculture,
livestock breeding and forestry. These stations monitor the following parameters, evaporation, humidity,
rainfall, sunshine duration, temperature and wind.
The Mauritius Sugar Industry Research Institute manages four such stations in Mauritius with the assistance
of the Meteorological Services. Savannah Sugar Estate maintains another station at La Baraque.
3. INSTRUMENTS IN USE AT METEOROLOGICAL STATIONS:
Raingauges
Ordinary raingauges with outer rim of diameter 11.28 cm together with ordinary laboratory cylinders
graduated in cubic centimeters are being used to measure rainfall at most stations. Readings are taken at
0700 hours daily. Fourteen stations are equipped with rain recorders, which provide rainfall intensities.
Thermometers and Hygrometers
Ordinary thermometers are used to measure dry, wet bulb and soil temperatures. Maximum and Minimum
temperatures are measured by appropriate thermometers. Thermohygrographs have been installed at eight
stations.
Anemometers
Nine Dines anemometers provide wind data at the following sites in Mauritius: Digue Seche, FUEL, Medine,
Mon Desert Alma, Pamplemousses, Plaisance, Port Louis Harbour Radio, Quatre Bornes and Vacoas. There
is also one Dines anemometer at Pointe Canon in Rodrigues. Wind at Agalega is measured by a cup
anemometer.
Sunshine Recorders
Campbell Stokes sunshine recorders have been installed at twenty-one sites in Mauritius. Two stations at
Rodrigues and one at Agalega are also in operations.
Evaporation Pans
Modified US Class A pans are used to measure daily evaporation amount at 13 stations in Mauritius and one
station, Pointe Canon, in Rodrigues.
Barometers
Mercury barometers, digital barometers and aneroid barographs are used at all synoptic stations to measure
atmospheric pressure.
Tide Gauges
Sea level is monitored using floating type gauges at Port Louis and Port Mathurin.
Wind Finding Radars
Upper Air observations are carried out daily at Vacoas and Pointe Canon using WF33 radars.
At Agalega and St. Brandon, upper air wind observations are made using a theodolite - an optical instrument.
Automatic Weather Stations
22 automatic weather stations have been installed at different sites over the island. There are also two
stations in Rodrigues. Weather parameters observed by these automatic weather stations are : humidity,
rainfall, temperature and wind.
4. METEOROLOGICAL SUMMARIES
Monthly summaries of meteorological observations in the form of mean totals, extreme values with date of
occurrence and departure from long term mean are presented in this issue for various climate parameters of
stations located in Mauritius, Rodrigues and the Outer Islands.
Map of Mauritius showing Contours and Basin
N
Mon
Choisy
40
NN
Contours: Height (metres)
Digue
Seche
Regional Delimitations
160
Pamplemousses
NN : North
NW : North West
NW
320
Fort William
EE : East
40
WW : West
CW : Central Plateau (Windward)
FUEL
Reduit
Alma
Medine
160
WW
320
CL : Central Plateau (Leeward)
EE
320
Beau
Champ
440
CL
Vacoas
40
160
SE : South East
SS : South
440
Sans
Souci
SW : South West
CW
600
Ferney
SE
160
Le Morne
Plaisance
SW
Britannia
SS
40
Bel Ombre
Scale 1:300,000
Seychelles
05º S
Diego Garcia
10º S
Agalega
Diego Suarez
15º S
Tromelin
St. Brandon
J. de Nova
Tamatave
Tana
20º S
Rodrigues
Reunion
Mauritius
Europa
25º S
Fort Dauphin
45º E
50º E
55º E
60º E
65º E
70º E
75º E
80º E
85º E
90º E
Area of responsibility of the Republic of Mauritius for the naming of tropical Cyclones
WEATHER SUMMARY - May 2008
Convective activity remained weak in the equatorial region all throughout the month. The few ragged
convective cloud clusters observed were unorganized and shortlived.
The light wind conditions which prevailed over the Mascarenes during the first three weeks were
conducive to the formation of sporadic localized thunderstorms. Worthy to note, is the funnel cloud
observed in the afternoon at Phoenix on the Central Plateau, on May 2.
Atmospheric conditions became very unstable in the period 14 to 19 May. Two zones of unsettled
weather crossed the island. The first one developed to the south west of Reunion on May 13. Active
clouds associated to the system triggered frequent thunderstorms and lightning which illuminated the
sky for hours in the evening. The next day it crossed Mauritius causing widespread thundery showers
and hail in few regions. The electricity network was damaged as the electric storm struck one of the
main power supply lines.
Very soon afterwards, another zone of unsettled weather developed between Mauritius and Rodrigues.
It influenced the weather from 16 to 18 May, causing widespread heavy rain and thunderstorms all over
the island. For e.g Arnaud and Plaisance recorded 310 mm and 192 mm of rainfall respectively over the
3 day period.
After the passage of a cold front on May 24 Mauritius came under the influence of cold and windy
weather due to the anticyclone to the south of the mascarenes. A drop of 2 to 4 degrees Celsius in
temperature was noted all through the island. This was infact the very first surge of cold air indicative
of an early onset of winter 2008.
Temperature both minimum and maximum was close to average at Mauritius and Rodrigues. The
minimum at St Brandon and Agalega were close to the average. It is to be noted that on certain nights
due to the calm conditions and clear skies the minimum dropped by 3 to 5 degrees below the long term
average. A minimum temperature of 9.7°C was recorded by the automatic weather station at Arnaud on
May 27.
Total rainfall over Mauritius for the month was well above the long term mean 180%. Rainfall at St
Brandon was close to average. However the second fortnight of May was very dry with rainfall
amounting only to 7% of the long term mean.
Rainfall at Agalega was well above the long term mean 160%. Rodrigues saw a very wet month with as
much as 201% of the long term mean rainfall at Pointe Canon.
Mean sea level pressure was slightly above average at Mauritius and Agalega, close to normal at St
Brandon but below average at Rodrigues.
RAINFALL IN MAURITIUS
Location
Alt
m
Total
mm
Dep
from
Normal
Cap Malheureux
Mont Choisy
Sottise
Mapou Cour
St. Antoine (Cour Usine)
Bain Boeuf (AWS)
Digue Seche
Solitude (La Plaine)
Mon Loisir Rouillard (AWS)
Mon Loisir Rouillard
Fond du Sac
Mapou (BVM)
Fleurant
Forbach (BVM)
Fair Fund
Belle Vue (BVM)
Labourdonnais
L'Esperance (BVM)
NPIPP
St. Andre (Cour)
Mauricia ( B.V.M. )
Schoenfield
St. Andre (AG22)
Mon Choix
Beau Plan
Beau Sejour
Champ Rose
Pamplemousses ( MSIRI )
Maison Blanche
Mon Loisir S.E.
The Mount
Esperance (Beau Plan)
Belle Vue Maurel
Mon Piton
Antoinette
Grande Rosalie
Mon Songe
California
Industrie ( Cour )
REGION: NORTH WEST
594374
12333
12342
16382
24391
510360
36396
48322
20370
19371
26345
28360
29387
35375
39347
39356
40365
42386
36342
46336
46353
46396
50328
56366
57340
57379
59327
61346
64351
66404
67357
70347
74400
63370
74381
79362
81381
91369
100355
3
9
18
40
30
7
30
30
55
49
40
64
46
58
84
104
73
69
55
91
40
44
122
65
114
41
79
96
64
119
88
97
177
171
198
186
262
180
109.0
130.5
148.0
132.1
147.0
131.2
175.4
159.0
191.8
162.0
160.3
186.0
170.7
181.0
148.0
164.0
138.0
178.0
165.2
134.0
213.5
105.5
151.0
141.8
177.0
112.6
151.0
202.3
153.0
82.5
234.2
208.0
137.4
247.2
213.2
316.2
179.7
283.5
161.0
Massilia
Cantin
Balaclava (AWS)
Richeterre (Versailles)
Cite La Cure
Fort William ( P.L.H.R. )
66315
73303
50310
76310
88313
91287
40
24
18
30
40
6
139.6
175.2
161.2
115.1
147.1
STATIONS
---
MAY 2008
No of days on which RR reached
or exceeded
Maximum
Rainfall
1
mm
5
mm
10
mm
25
mm
50
mm
10.6
50.4
61.7
42.6
38.6
55.1
91.8
59.2
89.2
80.5
67.3
74.0
60.2
55.9
32.1
69.2
114.3
2.1
26.1
88.0
-1.7
70.3
103.1
33.7
-37.2
99.3
95.5
13.4
124.9
69.8
174.8
8.2
104.3
38.9
10
9
9
9
12
12
10
9
11
10
9
13
9
12
9
12
10
12
12
10
13
13
10
12
12
12
8
14
9
10
17
9
13
12
14
18
17
19
10
7
6
8
9
7
8
8
6
9
9
8
8
7
7
7
6
7
7
7
7
7
6
7
5
7
5
7
7
8
7
14
7
6
9
10
10
10
11
7
5
4
4
5
5
5
8
5
6
6
6
6
6
5
6
5
5
5
5
6
5
5
6
4
6
4
6
6
5
3
7
6
4
5
8
8
6
8
4
1
2
2
1
3
1
2
2
3
3
2
2
3
3
2
2
1
3
3
2
2
1
2
2
2
1
2
3
3
0
3
2
2
3
2
5
2
4
3
0
1
1
0
0
0
0
1
1
0
1
1
0
1
1
1
1
1
0
0
2
0
0
0
1
0
1
1
1
0
1
1
0
1
1
2
0
1
1
27.0
56.3
55.4
30.2
34.0
29.2
39.0
54.3
56.6
46.0
55.7
80.0
49.0
59.0
52.0
52.0
56.4
56.0
36.7
32.0
65.0
31.6
40.0
45.0
67.0
37.0
55.0
54.2
51.0
14.7
50.8
79.0
31.5
86.0
57.1
61.0
43.9
73.7
63.0
18
17
17
16
16
16
16
81.6
95.4
98.9
8
10
10
8
6
6
7
6
5
5
3
6
5
2
5
3
3
3
2
3
1
0
1
1
0
59.0
43.0
71.2
56.2
49.0
17
16
17
17
16
in 24 hr
Date
mm
REGION : NORTH
* Often
- Data not available
aws:
automatic weather station
17
16
16
17
17
16
17
17
17
17
17
16
17
17
17
17
17
17
17
17
16
17
29
16
17
17
17
16
18
17
17
17
Location
Alt
m
Total
mm
Dep
from
Normal
Port Louis (aws)
Le Souvenir
Amitie ( I )
Amitie (2)
Notre Dame
Domaine Les Pailles (aws)
Valton
Beau Fonds
REGION : WEST
100300
69336
74335
81324
85334
117293
92335
91349
5
70
85
88
131
90
146
236
121.4
158.0
188.0
155.0
193.0
129.8
162.0
239.0
Pointe aux Sables
Albion (Medine)
Albion (aws)
Balisage
Petite Riviere Noire
Case Noyale
Petit Verger
Richelieu
Gros Cailloux
St Antoine (Medine)
La Mecque
La Ferme
Belle Vue (Medine)
Medine (Medine)
Palmyre (No.1)
Clarens (Medine)
La Verette
Magenta
Tamarin ( Estate )
Yemen
Beaux Songes (aws)
Chebel
Bagatelle (Medine)
Le Bosquet
Barkly ( Exp. Station )
Le Reduit ( MSIRI )
La Chaumiere (R.B. No1)
Trianon (Estate)
Corps de Garde
Beaux Songes (Medine)
Pierrefonds
Bassin
REGION : SOUTH WEST
102272
127240
120240
138232
232223
242220
109260
113272
124254
134249
149234
152248
153228
155233
168233
178236
190247
191260
193238
202242
160250
125270
131292
133263
133272
139293
140259
150291
162264
160250
171261
177268
15
12
5
40
3
15
52
67
82
116
85
140
61
91
91
67
72
88
43
67
225
162
302
183
207
311
174
305
281
225
278
314
68.5
95.5
110.4
122.8
204.4
251.0
54.8
81.0
57.0
68.0
81.5
81.2
73.0
66.7
67.1
114.6
69.6
110.0
75.9
70.9
94.8
98.6
209.5
77.6
98.0
155.8
81.9
162.1
82
150.0
143.9
La Gaulette
Le Morne (AWS)
Le Morne Brabant
Coteau Gambier
250215
260190
273184
265190
10
2
3
55
279
203.6
229.0
223.9
STATIONS
---
MAY 2008
or exceeded
Maximum
Rainfall
1
mm
5
mm
10
mm
25
mm
50
mm
65.4
96.5
72.3
97.9
60.0
127.8
7
9
10
11
11
6
11
10
5
5
6
6
5
5
5
7
5
5
4
4
3
5
4
5
3
1
2
2
2
2
2
3
0
1
1
1
1
0
1
1
35.0
74.0
96.0
71.0
120.0
37.4
92.0
130.0
16
17
17
17
17
16
17
17
61.5
91.6
155.8
183.9
31.1
15.6
30.9
41.6
42.2
45.0
24.0
25.4
78.2
34.8
64.4
31.9
22.4
55.1
123.9
35.0
43.3
71.4
34.7
29.8
103.2
86.3
6
6
6
6
5
11
6
6
6
4
4
8
6
5
3
4
7
4
7
7
9
6
10
5
14
7
4
9
4
3
5
5
5
5
5
5
7
5
6
3
3
3
4
3
3
2
4
3
3
4
4
4
4
6
3
7
6
3
5
3
3
3
4
3
4
5
4
5
3
4
3
3
2
3
2
2
1
2
3
3
3
2
3
4
4
3
2
4
3
4
2
3
3
0
2
2
2
4
3
0
1
0
1
2
2
1
1
1
2
1
2
1
1
2
2
3
1
1
2
2
2
2
3
3
0
0
0
0
2
2
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
2
0
0
1
0
1
0
2
1
21.8
37.4
34.8
47.0
73.4
76.0
15.8
33.0
21.6
28.0
40.5
28.0
40.8
36.2
55.7
66.3
31.9
45.0
26.5
27.4
31.8
32.0
69.1
30.0
30.0
70.1
27.4
79.2
39
65
81.3
14
14
14
14
14
14
14
14
14
16
14
14
14
14
14
14
14
16
16
14
16
14
17
14
14
16
14
16
14
16
16
203.8
154.3
-
10
10
9
15
7
6
9
4
6
5
6
4
3
3
3
3
3
2
3
2
80.4
59.4
58.0
72.7
14
14
18
14
in 24 hr
Date
mm
REGION : NORTH WEST
* Often
-
Data not available
aws:
---
MAY 2008
No of days on which RR
Dep.
reached or exceeded
from
1
5
10
25
50
Normal
mm mm mm mm mm
Maximum
Rainfall
in 24 hr
Date
mm
Location
Alt
m
Total
mm
Embrasure
La Crete
Terres Couleurs
Chamarel ( Estate )
Plaine Champagne
REGION : SOUTH
268204
253230
262220
262230
254258
45
290
259
267
701
215.0
337.5
343.0
322.0
439.4
231.9
231.1
197.9
184.5
8
14
16
18
16
6
8
9
8
13
4
6
6
6
8
3
4
4
4
7
3
3
3
3
4
70.0
92.0
99.0
87.0
76.9
17
14
16
16
14
Beau Champs (B.O)
Bel Ombre
St Felix (Factory)
Bel Air St. Felix
Terracine
Souillac (aws)
Cascades
Choisy Estate
Chamouny
Frederica
Canal Vacoas
Ste. Marie
Fontenelle
St. Aubin
Riviere des Anguilles
Bel Air (Benares)
Union Savanne
Val Riche
Luchon
Satana
Combo
Bois Sec (U)
Bois Cheri
Pradier
Grand Bassin (aws)
REGION : SOUTH EAST
299260
301244
301277
305288
306308
310320
283273
288223
289279
290250
294241
295273
297315
300322
301330
302339
304322
274261
275273
289260
287319
265306
254312
249297
240295
21
8
24
40
30
28
153
70
131
125
46
53
94
86
82
49
64
305
236
168
175
439
475
600
605
274.0
355.8
569.6
530.4
345.0
341.0
281.7
422.5
279.9
484.3
292.6
371.0
345.0
345.9
286.0
301.0
307.0
626.0
644.2
304.0
386.0
531.0
632.6
627.5
510.2
108.9
233.2
435.4
413.5
199.4
100.6
303.2
75.4
330.2
162.9
209.1
181.3
213.9
137.2
157.6
156.3
405.1
324.6
142.9
194.0
285.4
323.4
-
17
16
17
16
18
17
18
18
19
17
17
19
18
17
14
16
18
16
18
18
20
24
28
22
20
10
11
12
12
12
11
13
11
12
15
9
13
12
10
12
13
13
16
15
10
14
15
13
16
14
7
8
10
9
9
8
6
8
7
8
7
11
10
8
9
8
8
9
12
9
9
12
12
11
10
5
5
7
7
4
3
4
4
3
5
4
6
6
4
5
3
4
7
6
5
8
8
8
9
6
2
2
5
5
3
2
2
4
1
4
2
2
2
3
2
2
2
4
4
2
2
4
4
5
3
67.0
125.0
147.3
111.8
90.0
105.6
67.3
97.0
99.5
100.2
70.0
82.0
61.0
69.7
75.0
91.0
66.0
132.0
182.9
75.0
70.0
100.0
136.0
133.0
146.4
14
14
18
18
18
18
14
17
14
17
17
18
14
14
18
18
14
18
17
18
16
18
16
16
16
Pointe aux Feuilles
Bestel
Camizzard
Providence (F)
Ferney
Le Vallon
Campement
Ste Helene
Beau Vallon (Cour)
Terre Rocheuse (BVWest)
Terre Rocheuse (RLChaux)
Mon Desert ( M.D.M.T. )
Riviere Tabac
Florine
183463
204403
208417
215439
216420
220410
203413
251405
252416
257413
260424
271403
293378
211390
15
15
21
24
6
3
20
40
21
27
9
23
31
145
187.0
530.5
549.0
374.7
376.5
420.6
318.8
349.8
284.2
273.2
284.8
290.4
284.6
433.6
31.4
272.7
274.3
225.6
171.1
245.9
200.2
144.7
129.5
147.8
150.0
145.8
190.6
13
21
21
16
18
19
15
17
15
14
12
14
14
19
7
19
16
10
9
12
8
10
9
7
9
7
8
15
5
13
12
7
8
8
6
6
7
7
6
5
7
10
2
6
7
4
5
4
4
5
3
3
2
4
5
6
1
3
2
2
2
2
2
2
2
2
2
2
2
3
61.0
144.6
200.2
133.4
142.6
167.9
145.5
110.0
93.0
87.0
102.0
120.0
96.0
105.4
18
18
18
18
18
18
18
18
18
18
18
18
18
18
STATIONS
REGION : SOUTH WEST
* Often
-
Data not available
aws:
Location
Alt
m
Total
mm
Dep.
from
Normal
Le Val
Cent Gaulettes
Riviere des Creoles
Riche En Eau
Riche En Eau (aws)
Astroea (R.E.E)
Courbevoie
Ruisseau Copeaux
Mon Tresor
Plaisance
Gros Bois
Union Vale
Sauveterre
La Baraque
Colmar Siding Benares
Savinia
Chateau Benares
Savanah
St. Felix (B.A.S.E)
Benares
Montagne Ronde
Eau Bleu Tostee
Mont Vernon
Astroea (R.B)
Rose Belle
Deux Bras
New Grove
Hewetson
St. Avold
Joli Bois
Britannia
Riche Bois (B)
REGION : EAST
213373
214384
220389
231394
233379
243400
250385
254392
261410
264365
267389
276390
280371
284334
285380
288349
291365
293339
296349
201387
227363
232369
233360
238355
239278
251361
261341
262331
264349
271334
274346
137
145
134
110
163
69
114
73
50
160
58
49
76
168
49
107
58
122
76
216
213
287
274
280
158
219
255
293
216
229
191
435.2
453.2
368.9
395.2
417.6
372.3
453.7
404.8
375.3
385.5
319.6
287.3
372.4
326.5
300.3
281.3
282.0
281.5
505.8
602.7
494.8
626.3
489.1
602.2
565.6
496.3
628.5
408.8
Haute Rive
Bras D'Eau
Providence (P.de Flacq)
Bassin Requins
Constance
Belle Mare
Mare La Chaux
Palmar (aws)
Beau Rivage
Beau Champ - Littoral
Grande Retraite (La Retraite)
Allendy (BV)
Argy
67429
82443
100441
102452
107424
116461
117451
138480
153472
164465
97404
116414
116439
18
9
6
8
40
3
20
5
3
15
113
109
43
96.5
124.0
139.0
193.0
144.5
171.5
161.0
208.4
197.1
202.2
158.0
154.0
141.5
STATIONS
---
MAY 2008
or exceeded
Maximum
Rainfall
1
mm
5
mm
10
mm
25
mm
50
mm
in 24 hr
Date
mm
196.7
235.7
171.7
194.2
207.1
311.9
216.9
221.9
182.4
171.3
153.3
170.9
172.0
109.3
122.9
79.5
130.4
212.0
330.9
238.8
372.3
304.2
410.1
345.8
285.5
408.6
212.1
20
20
17
17
20
18
19
15
15
17
15
15
19
17
17
17
17
18
20
21
19
21
21
20
18
20
20
17
14
15
12
12
13
12
12
10
9
12
11
11
13
10
12
12
13
12
14
14
13
17
15
15
14
14
14
12
11
9
9
11
10
6
7
6
5
9
7
5
11
7
9
8
10
7
13
12
11
15
10
11
12
10
11
9
4
5
4
6
5
5
5
5
5
6
4
4
5
5
4
4
3
3
6
7
6
9
5
6
7
6
8
5
3
3
1
2
1
2
3
3
2
2
2
2
2
1
2
2
3
2
3
4
2
4
4
4
3
4
4
3
105.4
121.8
122.2
120.4
127.2
127.5
152.3
144.7
138.2
111.0
118.0
106.0
80.0
105.2
70.0
88.0
50.0
65.0
121.0
158.3
168.4
104.0
144.8
164.2
135.0
155.0
143.0
119.0
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
14
14
18
18
18
18
18
18
18
18
18
18
-6.8
5.1
0.6
68.1
4.2
37.0
28.3
70.1
60.0
-4.5
-12.8
-5.9
10
5
12
13
14
12
10
13
15
13
16
17
16
6
5
7
8
8
7
7
10
9
10
8
9
9
4
5
5
5
4
5
5
6
4
6
6
7
5
1
2
2
3
1
2
2
2
2
2
2
1
1
0
1
0
1
0
1
1
1
1
1
0
0
0
27.0
55.0
42.0
65.0
42.0
72.0
70.5
81.2
72.4
81.0
32.0
40.0
34.0
16
19
18
18
18
18
18
18
18
18
17
17
18
REGION : SOUTH EAST
* Often
-
Data not available
aws:
Location
Alt
m
Total
mm
Dep
from
Normal
FUEL ( UNION )
La Gaiete
Queen Victoria
Queen Victoria (aws)
Belle Etoile
Naye
Caroline
Clemencia
Belle Rose (DRBC)
La Lucie
Terre Franche (DRBC)
Grand Port (DRBC)
Trois Ilots
La Louise (T. Rocheuse)
Olivia
Beau Vallon (DRBC)
Etoile
Belle Rive (DRBC)
Rich Fund
Unite
Gibraltar
Bel Etang
Sans Souci
REGION : CENTRAL
PLATEAU WINDWARD
127410
128435
132424
130420
137453
139440
148450
153421
153434
154441
166438
167458
171449
174421
178441
178449
183442
186431
125399
138401
138412
145391
178392
146
64
125
112
71
85
64
119
82
73
79
64
91
156
101
110
116
116
189
226
165
265
277
228.3
174.6
211.0
190.8
177.5
222.9
238.8
323.4
197.0
161.9
264.5
201.0
261.9
299.9
296.2
301.4
418.8
263.0
246.1
292.0
283.0
387.9
431.4
Bonne Veine (MDA)
Providence
Providence (aws)
Grosse Roche
Piton du Milieu
Eau Bleue Dam
Union Park ( MSIRI )
Beau Climat
La Flora
Nouvelle Decouverte(aws)
Belle Rive (1E)
Belle Rive ( 2E )
XVI Mile(Mon Bois)(aws)
REGION : CENTRAL
PLATEAU LEEWARD
143353
146371
148367
172375
175346
211357
230344
234336
248334
110350
170335
174335
200320
433
369
378
335
442
347
357
390
360
480
476
467
590
Beau Bois (MDA)
Mon Desert Alma
Minissy (MDA)
Minissy (H)
Moka (aws)
Cote d'Or
Bagatelle (H)
124335
133316
135302
143306
130300
147315
151308
436
367
354
366
344
412
393
STATIONS
---
MAY 2008
or exceeded
Maximum
Rainfall
1
mm
5
mm
10
mm
25
mm
50
mm
60.6
16.3
30.1
37.7
46.7
86.0
128.9
17.1
-2.1
74.6
61.2
95.3
98.2
92.2
146.6
181.1
34.3
48.7
97.2
92.6
163.8
123.8
18
16
20
18
12
16
15
17
16
16
15
14
17
17
19
18
17
17
16
16
15
20
22
9
10
10
9
6
10
10
9
10
10
12
11
8
14
13
10
13
9
9
8
8
11
12
6
5
7
6
5
5
5
6
5
5
6
5
6
9
8
7
9
8
7
7
7
9
10
1
2
2
2
2
3
2
3
3
1
3
2
2
3
4
5
5
3
2
2
4
4
5
1
0
1
0
1
1
2
3
1
0
2
1
1 1
2
2
2
1 1
1
1
2 1
1
2 1
3
84.2
39.7
68.0
41.0
86.0
64.6
87.0
95.3
65.0
45.8
76.0
72.0
10.0
70.0
72.0
91.8
58.6
66.4
87.7
25.0
95.7
34.0
85.0
17
17
17
17
18
17
18
17
18
18
18
18
18
18
18
18
18
18
17
17
17
17
18
309.4
393.6
333.2
443.6
369.0
337.1
575.0
743.3
320.0
497.8
461.1
-
78.9
145.2
165.2
110.2
47.8
307.1
507.9
264.5
225.1
-
16
25
19
25
17
21
21
19
15
23
22
-
8
13
10
14
12
11
16
15
10
11
13
-
8
9
7
11
8
8
13
12
7
8
8
-
3
4
4
3
5
4
6
8
4
6
5
-
2
3
2
3
2
2
3
5
2
2
2
-
91.2
95.0
100.4
98.0
133.9
73.0
162.2
188.6
105.4
199.0
205.8
-
17
16
16
17
16
18
18
18
17
16
16
-
250.8
223.0
211.6
220.7
156.0
221.8
234.2
68.6
101.3
118.4
113.2
95.7
118.0
15
12
9
14
12
15
14
10
7
6
7
6
9
7
7
4
4
4
4
4
4
3
3
3
2
2
2
2
2
2
2
2
1
2
1
87.1
70.4
70.4
77.2
63.0
83.3
113.5
17
16
17
16
16
16
16
in 24 hr
Date
mm
REGION : EAST
* Often
-
Data not available
aws:
Location
Alt.
m
Total
mm
Dep
from
Normal
159280
164305
176294
182258
184293
186275
192276
144340
152334
161318
168326
182316
199281
178310
201290
211275
214283
216294
225275
228295
170290
243275
353
421
424
396
433
396
430
451
448
454
488
564
469
614
353
485
536
564
579
576
580
655
138.7
218.5
232.0
139.1
255.0
125.6
163.8
293.9
276.1
245.7
365.4
249.1
203.4
348.0
273.1
146.5
243.4
411.4
396.6
509.7
517.0
628.0
Pointe Canon
Corail Airport
Citronelle (aws)
REGION :
AGALEGA ISLANDS
407255
454216
418265
58
33
335
Agalega
10º 21' S
56º 35' E
16º 27' S
59º 37' E
STATIONS
---
MAY 2008
or exceeded
Maximum
Rainfall
in 24 hr
Date
mm
1
mm
5
mm
10
mm
25
mm
50
mm
58.5
101.8
111.7
90.9
127.9
61.1
73.3
89.1
82.9
75.0
150.3
34.5
96.9
135.0
23.0
97.3
209.5
210.4
255.0
357.7
8
10
11
5
8
6
7
16
17
14
16
13
8
17
12
17
8
19
19
24
22
19
5
7
8
3
7
4
4
10
9
8
10
9
6
11
9
6
7
12
11
13
13
16
3
5
5
3
4
3
3
6
7
5
7
6
5
9
7
5
5
8
8
10
10
10
3
3
3
1
3
2
2
2
2
2
3
3
3
4
4
2
2
6
5
8
8
6
1
1
1
1
2
1
1
2
2
2
2
1
2
2
2
0
2
3
4
4
2
6
57.0
102.0
116.0
87.8
92.4
52.5
76.2
100.6
118.6
77.2
188.0
100.0
80.0
115.0
65.0
38.1
89.8
99.8
89.0
110.8
153.4
160.0
16
16
16
16
17
16
16
17
16
16
16
16
16
16
16
17
17
16
16
16
16
16
157.2
116.5
78.9
44.4
-
13
10
8
7
6
3
2
2
0
0
44.4
28.9
3
18
3
163.1
61.3
10
7
4
1
1
92.3
27
4
83.3
4.6
8
3
3
1
0
30.6
2
REGION : CENTRAL
PLATEAU LEEWARD
Quatre Bornes ( Michaud )
Highlands
Vacoas
Burgos
Reunion
Holyrood
Moon
Alma
Valetta
Hermitage
Belle Rive (MSIRI)
Wooton
Henrietta
Trou aux Cerfs (aws)
La Marie
Tamarin ( Res. )
Bonne Fin
Good End
Mare Longue
Arnaud
Arnaud (aws)
Petrin
REGION : RODRIGUES
REGION :
ST. BRANDON ISLANDS
St. Brandon
* Often
-
Data not available
aws:
MEAN MONTHLY RAINFALL May 2008
Isohyetal Analysis ( mm )
REGION
NORTH
NORTH
WEST
HEIGHT
EAST
WEST
0 -- 40
144
144
148
103
40 -- 160
169
155
224
99
160 -- 320
234
193
369
320 -- 440
250
222
427
440 -- 600
250
600 -- 680
316
360
254
372
374
367
284
141
424
529
471
324
265
485
222
550
557
433
254
350
494
316
633
453
250
350
564
521
646
433
>680
Total Mean
CENTRAL PLATEAU SOUTH
SOUTH
SOUTH
Windward Leeward
EAST
WEST
659
169
172
255
115
492
694
288
413
472
333
Mean Rainfall over Mauritius : 298.8 mm
Percentage Rainfall of Long Term Mean : 188 %
After a very dry April, it eventually rained quite significantly and May 2008 turned out to
be very wet with a mean rainfall of 299 mm over Mauritius representing 188% of the
long term mean 1971-2000.
However, the first week was mainly dry followed by 4 rainfall episodes namely 08-12,
14-20, 23-24, and 29-31.
The second rainy episode was the most significant one where two active cold fronts
crossed the island on the 16 and the 19. Afterwards, easterly waves coupled with a
very unstable atmosphere contributed significantly to the bulk of precipitation. Over
some regions of the island, particularly to the south and over the central plateau,
moderate showers were frequent. There were even reports of thunder / lightning on the
14, 16 and 18 with water accumulation that affected crops in certain areas.
Actually the first half of May had only a mean rainfall of 58 mm representing 36 % of
the LTM and the second half had a mean of 228 mm representing 144% of the LTM.
Overall, all regions of the island had above normal precipitation with the windward side
of the central plateau recording the highest amount namely 492 mm. However, the
southwest had the highest percentage of rainfall, that is 273%.
RAINFALL ANALYSIS - May 2008
Expressed as a percentage of the mean
Isohyets in millimetres
100-150
Mon
Choisy
Mon
Choisy
150-200
Digue
Seche
200
Pamplemousses
300
Digue
Seche
100
Pamplemousses
200-250
50-100
Fort William 150-200
Fort William
300
50-100
100-150
FUEL
200-250
Reduit
Alma
100
400
Beau
Champ
200
Medine
FUEL
150-200
Reduit
Medine
Alma
100-150
150-200
Beau
Champ
200-250
500
Vacoas
Vacoas
Sans
Souci
600
150-200
Sans
Souci
150-200
300
400
Ferney
Ferney
Le Val
500
Le Val
600
200-300
700
Plaisance
400
Le Morne
Britannia
Bel Ombre
300
300
150-200
Le Morne
300-350
200-300
Plaisance
Britannia
150-200
Bel Ombre
300-350
METEOROLOGICAL SUMMARIES
May 2008
Monthly Data from Climatological Stations
TEMPERATURE
(ºC)
STATIONS
7
31.2
29.1
29.0
30.5
29.7
31.0
27.2
27.5
32.4
31.0
30.7
30.6
30.6
27.5
30.6
26.0
1
1
94
16.2 22,27
80 71 57 25 81
15.2
22
13.0
28
97 85 59 24
14.5
26
16.0
22
16.0 often
139
13.9
26
11.3
27
21.0 14,26
16.0
21
94
16.8
28
92
17.5
15
90 81 59 20
16.0 27,28
14.0
*
85 15.5
22
90 75 52 25
14.5
26
aws: automatic weather station
27
30
-5
-
6.6
5.0
1
11,25
31
22
7.5
1
21
25
-5
-39
7.0
5
25
3,7
7.4 10.9
1
202 -24
215 23
181 -13
193 10
-
6.5 10.6
6.9 10.7
5.8 10.1
6.2 9.9
-
1
24
23,25
193 -10
163 -17
175 5.6
6.2 10.0
5.3 9.8
5.6 10.3
3
22
22
223 -19
7.2 10.8
26
237 20.1 7.6 10.1
193 6.2 10.4
222 -12 7.2 10.5
9
27
5
13
-
Depth 100cm
230
Depth 50cm
16
MEAN SOIL
TEMP (ºC)
Depth 30cm
9.0
Date
-26
Daily Maximum
Departure from Normal
26
Mean Daily
Total Sunshine
20.3 -0.2 23.9 0.2
19.5 0.2 22.8 0.1
16.4 -1.6 21.5 -0.1
18.6 -1.1 22.7 -0.1
19.8 -0.3 23.4 0.1
19.9 -0.4 23.9 0.8
17.1 -1.0 21.2 -0.3
16.4 -0.2 20.0
0
23.0
25.5
18.9 -1.6 24.0 -0.2
20.0 0.5 24.2 0.4
20.2
24.8
18.1
23.1
17.5 0.2
21 -0.2
19.3 0.6 22.5 0.2
17.0
19.7
2,13
Date
0.6
-0.1
1.4
0.8
0.5
1.9
0.4
0.2
1.2
0.3
-0.6
-0.2
-
1
1
13
13
1
*
13
15
4
1
1
105
Max. Evaporation
27.4
26.1
26.5
26.8
27.0
27.9
25.3
23.6
27.9
29.1
28.4
29.3
28.0
24.4
25.7
22.3
1,2
Daily
28
28
-
18.0
15.3
1,2
Number of days
Date
9
2
BRIGHT SUNSHINE
( Hrs )
Total Evaporation
Lowest Minimum
32.5
30.4
Date
Date
0.5
0.4
Lowest Relative Humidity
Highest Maximum
20.5 -1.0 25.9
18.6 -0.7 23.6
Mean Relative Humidity ( PM )
1.9
1.4
Mean Realtive Humidity ( AM )
Mean Minimum
31.2
28.6
Mean Temperature
Mean Maximum
Fort-William
DigueSeche
Labourdonnais
NPIPP
Constance
FUEL
Sans Souci
Le Val (aws)
Rose Belle
Riche en Eau
Beau Vallon
Sauveterre
Britannia
Bois Cheri Tea Est.
Le Morne (aws)
Richelieu
Medine
Barkly Exp. Station
Case Noyale
Mon Desert Alma
Quatre Bornes
Trou aux Cerfs (aws)
* Often
EVAPORATION
( mm )
RELATIVE
HUMIDITY ( % )
METEOROLOGICAL
SUMMARIES
May 2008
Monthly Data from Agrometeorological Stations
TEMPERATURE
(ºC)
STATIONS
MEAN SOIL
TEMP (ºC)
Daily
Date
Total Sunshine
-11
4.7
16
216 -20
7.0 10.5 25 & 27 25.3 25.3
25.2 0.2 16.8 -1.1 21.0 -0.4 28.5
13
14.0 23
84
74
60
22
105
30
0
5.2
6
213 -10
6.9
9.8
9.9 13 & 25 23.3 23.3 23.9
21.0 0.4 28.0 1 & 3 12.0 27
88
78
54
26
97
30
2
9.5
26
194
-9
6.3
24.7 0.4 17.8
0.2
21.3 0.3 28.2
84
80
56
22
79
28
-8
4.3
14
163
2
5.3 10.4
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
-
13.7 27
-
-
-
-
22
-
Depth 100cm
31
0.1
Depth 50cm
Number of days
96
5
Depth 30cm
Total Evaporation
27
25.3 0.7 16.6
Date
Date
Daily Maximum
57
Mean Daily
Mean Realtive Humidity ( AM )
77
Max. Evaporation
Date
80
Lowest Minimum
Date
14.0 23
Highest Maximum
* Often
La Baraque
BRIGHT SUNSHINE
( Hrs )
1
Mean Temperature
Union Park
Belle Rive
EVAPORATION
( mm )
28.7 0.6 18.4 -0.2 23.6 0.2 31.5
Mean Minimum
Reduit
Mean Maximum
Pamplemousses
RELATIVE
HUMIDITY ( % )
24.1 22.9 24.9
21.5 22.3 23.8
METEOROLOGICAL
SUMMARIES
May 2008
Monthly Data from Synoptic Stations
TEMPERATURE
(ºC)
STATIONS
RELATIVE HUMIDITY
(%)
BRIGHT SUNSHINE
( Hrs )
BAROMETRIC PRESSURE
( hPa )
27
1014.8 0.1 1017.4 16 1012.0 3
30.7 0.7 24.6 0.3 27.7 0.5 31.4 16 21.8 15 86 75 81
1
64
12
1012.5 1.0 1014.7 16 1010.0 3 274
Often
-
Data not available
**
Mean from main synoptic hours
-
*** Station level pressure
8.8 10.8
1,8
Date
63
2
Daily Max. Evaporation
4
128 29 10 8.1 16
7.1 10.7 25 107 30
1016.0 -0.7 1018.5 16 1012.2 3 206 -40 6.6 10.7
21.7 15 84 80 83
Number of days
1
3
Total Evaporation
St.Brandon 28.8 0.9 24.4 0.3 26.6 0.6 31.7
Date
25,26
*
Daily Maximum
57
3 221 -8
Mean Daily
3
19.0 26 82 74 78
Total Sunshine
1
965.0
Date
27.6 0.1 21.5 -0.1 24.6 0.0 30.1
5
Lowest Mean MSL Pressure
Rodrigues
Agalega
Date
Date
968.2 -0.3 971.1
Highest Mean MSL Pressure
25
Difference from Normal
Difference from Normal
49
Mean MSL Pressure **
Mean Relative Humidity **
0
15.0 22 92 74 83
Mean Relative Humidity ( AM )
1
Date
24.8 0.0 17.9 0.2 21.4 0.1 28.0
Lowest Minimum
Vacoas ***
Date
1017.6 0.7 1020.7 16 1013.6 3 175 -22 5.6 9.5
Highest Maximum
25
49
Mean Temperature
-5
15.6 27 83 71 76
Mean Minimum
1
27.0 0.2 20.5 0.3 23.8 0.3 29.8
Mean Maximum
Plaisance
EVAPORATION
( mm )
-1 5.6
117 31 -33 6.5
6
1,2
MEAN SEA SURFACE TEMPERATURE - May 2008
30°C
28°C
26°C
24°C
22°C
20°C
SURFACE WIND - May 2008
Wind Rose (% Frequency)
PLAISANCE
9
1
VACOAS
3
12
1
Calm
4
2
3
1
Calm
5
15
16
3
17
2
11
3
3
20
(ms-1)
Mean Wind Speed
Maximum Gust
Date
49
20
6.5
(ms ) 15.2
14
Mean Wind Speed
Maximum Gust
Date
-1
FORT - WILLIAM
(ms-1)
5.4
-1
(ms ) 14.8
30
ST. BRANDON
2
Calm
Calm
12
22
5
DATA NOT AVAILABLE
-1
Mean Wind Speed
Maximum Gust
Date
Mean Wind Speed
Maximum Gust
Date
(ms )
(ms-1)
RODRIGUES (Pte. Canon)
1
2
2
-1
(ms )
(ms-1)
6.7
-
AGALEGA
15
Calm
5
1
37
22
Calm
5
18
27
1
2
28
11
4
14
38
26
Mean Wind Speed
Maximum Gust
Date
FREQ:
0
20
40
(ms-1)
6.3
(ms ) 17.0
12
Mean Wind Speed
Maximum Gust
Date
-1
60
80
100
(ms-1)
(ms-1)
3.5
-
UPPER WIND OBSERVATIONS -
May 2008
Vector Mean
LEVEL
850 hPa
1500 m
700 hPa
3000 m
500 hPa
5700 m
400 hPa
7500 m
300 hPa
9600 m
250 hPa
10800 m
200 hPa
12300 m
150 hPa
14100 m
100 hPa
16500 m
STATION
Deg kt
Deg kt
Deg kt
Deg kt
Deg kt
Deg kt
Deg kt
Deg kt
Deg kt
VACOAS
-
-
-
-
-
-
-
-
-
RODRIGUES
-
-
-
-
-
-
-
-
-
Maximum Wind
LEVEL
850 hPa
1500 m
700 hPa
3000 m
500 hPa
5700 m
400 hPa
7500 m
300 hPa
9600 m
250 hPa
10800 m
200 hPa
12300 m
150 hPa
14100 m
100 hPa
16500 m
STATION
Deg kt
Deg kt
Deg kt
Deg kt
Deg kt
Deg kt
Deg kt
Deg kt
Deg kt
VACOAS
-
-
-
-
-
-
-
-
-
RODRIGUES
-
-
-
-
-
-
-
-
-
Absolute Maximum Wind
STATION
Deg kt Height (m)
Date
VACOAS
-
-
-
RODRIGUES
-
-
-

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