REPUBLIC OF MAURITIUS

REP UB LIC OF MAURIT IUS
METEOROLOGICAL SERVICES
MONTHLY BULLETIN
of
CLIMATOLOGICAL SUMMARIES
OCTOBER 2010
February 2011
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 Weather Stations
Synoptic weather stations perform synoptic weather observations; that is, surface weather observations at
fixed intervals of time of sky cover, cloud base height, atmospheric pressure, temperature, dew point, wind
speed and direction, precipitation amount, horizontal visibility and other special phenomena.
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
Climatological stations record such parameters as: maximum and minimum temperatures, rainfall and some
other elements like atmospheric pressure, humidity, soil temperatures, sunshine and wind. The Mauritius
Meteorological Services has a network of 26 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
collaboration 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.
1
Thermometers and Hygrometers
Ordinary mercury in glass thermometers are used to measure dry, wet bulb and soil temperatures.
Maximum and Minimum temperatures are measured by other appropriate thermometers.
Thermohygrographs have been installed at four stations.
Anemometers
Eight Dines anemometers provide wind data at the following sites in Mauritius: Digue Seche, FUEL,
Medine, Mon Desert Alma, Pamplemousses, Plaisance, Quatre Bornes and Vacoas. There is also one Dines
anemometer at Pointe Canon in Rodrigues. At Agalega, St. Brandon and Plaine Corail airport in Rodrigues,
wind is measured by a cup anemometer.
Sunshine Recorders
Campbell Stokes sunshine recorders have been installed at twenty-one sites in Mauritius. One station 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 tide gauges installed at Port Louis and Port Mathurin. In January 2009, a new
tide gauge was installed in Agalega and another one at Blue Bay.
Upper Air monitoring Equipment
Upper Air observations are carried out daily at Vacoas.
A GPS system using the SR2K2 software ICAR-IGOR pro 5.03 is used to compute upper level winds.
Automatic Weather Stations
22 automatic weather stations have been installed at different sites over the island. Weather parameters
observed by these automatic weather stations are: humidity, rainfall, temperature, wind and pressure. Four
stations, namely Vacoas, Bain Boeuf, Belle Mare and St Felix also record global solar radiation. There are
also two stations in Rodrigues which measure all the above six parameters.
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.
2
Map of Mauritius showing Contours and Basin
N
Mon
Choisy
40
NN
Contours: Height (metres)
Digue
Seche
Regional Delimitations
160
NN : North
Pamplemousses
NW : North West
NW
EE : East
320
Fort William
WW : West
40
CW : Central Plateau (Windward)
FUEL
Reduit
Alma
Medine
160
WW
320
SE : South East
EE
320
Beau
Champ
440
CL
Vacoas
40
CL : Central Plateau (Leeward)
160
SS : South
SW : South West
440
Sans
Souci
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
Rodrigues
Reunion
20º S
Mauritius
Europa
Fort Dauphin
45º E
25º S
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
3
WEATHER SUMMARY - OCTOBER 2010
The current La Nina conditions which had started to develop in June and July 2010, was classified as
a moderate to strong La Nina event during the month of October. On the other hand, the sea surface
temperature pattern over the Indian Ocean confirmed a negative Indian Ocean Dipole. Satellite
pictures were indicating quite strong subsidence over western equatorial Indian Ocean. Most of the
active clouds were confined over the South East Indian Ocean.
In all four shallow lows developed over the equatorial region during the month of October. One of
these lows evolving to the east south east of Diego Garcia intensified into a tropical depression in the
early morning of October 27; however due to unfavorable conditions the system started to weaken
during the day. It is worth noting that, another low evolving to the east of Cocos Island was named,
Anggrek, on October 31. Since this storm was evolving in the Australian region of responsibility, it was
being monitored by Perth TCWC.
With the axis of the subtropical high lying around latitude 32 degree south, moderate easterlies were
flowing over the Mascarenes during the first week of October. Perturbations in the easterlies
accounted for some fairly good amount of rainfall over the island during this period. Thereafter,
Mauritius was mainly under the influence of a ridge and conditions were mainly dry.
During the month of October, Mauritius, St- Brandon and Agalega were deficient in rainfall. The total
rainfall over Mauritius amounted to a mean of 45 mm, which was 64% of the normal. Outer island
stations Agalega and St-Brandon recorded 29 % and 61 % of the normal respectively. Rainfall
recorded over Rodrigues was above the seasonal mean (111%).
Temperatures, both maximum and minimum were slightly above the monthly mean for all the stations
of the Republic of Mauritius, including the outer islands stations. The bright sunshine hour over
Mauritius was slightly above whereas at Rodrigues, due to some cloudy days the monthly sunshine
hours were below normal.
The mean sea level pressure was slightly below the long-term mean at all stations.
4
RAINFALL IN MAURITIUS
STATIONS
Alt
Location
m
Total
mm
Dep
from
Normal
---
OCTOBER 2010
No of days on which RR
Maximum
reached or exceeded
Rainfall
1
5
10
25
50 in 24 hr
Date
mm mm mm mm mm
mm
REGION : NORTH
Cap Malheureux
Mont Choisy
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)
Belle Vue (BVM)
Labourdonnais
NPIPP
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
16382
24391
510360
36396
48322
20370
19371
26345
28360
29387
35375
39356
40365
36342
46353
46396
50328
56366
57340
57379
59327
61346
64351
66404
67357
70347
74400
63370
74381
79362
81381
91369
100355
3
9
40
30
7
30
30
55
49
40
64
46
58
104
73
91
40
44
122
65
114
41
79
96
64
119
88
97
177
171
198
186
262
180
15.0
11.7
7.9
14.2
10.2
17.2
9.0
23.2
16.6
12.4
18.0
13.8
23.0
30.0
21.1
20.5
25.0
16.6
16.0
16.3
21.0
15.4
20.0
23.4
27.8
25.5
26.1
16.0
28.3
26.8
33.1
47.9
34.3
45.4
32.0
-15.3
-17.2
-23.3
-24.0
-27.5
-15.4
-17.6
-17.3
-15.8
-23.2
-16.4
-11.1
-20.1
-13.3
-13.0
-21.0
-21.0
-25.8
-13.7
-24.5
-25.1
-14.4
-33.3
-31.0
-14.1
-13.9
-27.1
-15.6
-39.1
-39.6
-15.2
4
2
1
3
5
4
3
5
4
2
3
3
2
4
3
5
4
4
3
2
3
3
3
6
5
3
5
3
4
3
5
8
6
6
4
1
2
1
1
1
1
1
2
1
2
1
1
2
3
2
2
2
1
2
2
2
1
2
1
2
1
1
1
1
2
3
4
3
4
4
1
0
0
0
0
0
0
1
0
0
1
0
1
1
1
0
1
1
0
0
0
0
0
1
1
1
1
1
1
2
1
2
1
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
10.0
6.0
7.9
8.6
5.8
8.6
6.0
10.4
9.0
7.0
10.0
8.9
15.0
13.0
10.9
6.7
13.0
10.3
8.0
9.1
9.0
9.8
9.0
12.0
15.0
18.8
15.0
10.0
15.8
12.2
15.0
15.0
15.0
15.0
11.0
4
1
4
4
4
4
Cantin
Balaclava (AWS)
Richeterre (Versailles)
Cite La Cure
Fort William ( P.L.H.R. )
73303
50310
76310
88313
91287
24
18
30
40
6
10.9
24.2
7.4
-15.5
-7.5
3
7
4
0
2
0
0
0
0
0
0
0
0
0
0
4.6
6.0
2.5
4
27
4
* Often
- Data not available
5
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
aws: automatic weather station
RAINFALL IN MAURITIUS
---
OCTOBER 2010
No of days on which RR
Maximum
reached or exceeded
Rainfall
1
5
10
25
50 in 24 hr
Date
mm
mm mm mm mm mm
Alt
Location
m
Total
mm
Dep
from
Normal
Port Louis (aws)
Le Souvenir
Amitie (2)
Notre Dame
Domaine Les Pailles (aws)
Valton
Beau Fonds
REGION : WEST
100300 5
69336 70
81324 88
85334 131
117293 90
92335 146
91349 236
7.8
17.0
17.0
23.0
14.8
20.0
26.0
-18.7
-11.5
-16.1
-19.0
-20.0
3
3
4
4
5
4
4
0
2
2
2
0
2
2
0
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2.6
9.0
6.0
10.0
4.2
6.0
11.0
24
4
1
4
24
4
4
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
2.8
6.8
4.1
4.0
7.0
2.0
0.0
2.0
2.0
6.8
1.5
2.7
0.0
0.0
0.0
1.0
0.0
0.0
10.2
4.0
28.0
2.0
14.0
2.0
21.1
0.0
8.2
7.0
9.5
-8.4
-7.2
-15.0
-16.8
-15.8
-10.1
-11.2
-11.2
-6.4
-13.8
-13.2
-12.2
-14.9
-28.4
-20.9
-20.9
-11.8
-5.5
-11.5
-26.3
-13.8
-12.1
-16.0
-17.9
1
3
2
2
3
2
0
1
1
2
1
2
0
0
0
1
0
0
4
2
6
1
5
1
7
0
4
4
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
1
0
1
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2.4
3.4
2.6
2.0
3.2
1.0
2.0
2.0
3.4
1.5
1.4
1.0
2.8
2.0
8.9
2.0
5.1
2.0
5.6
2.8
2.0
5.2
4
4
4
4
4
4
4
4
4
4
29
18
1
4
4
4
4
4
1
1
1
24
La Gaulette
Le Morne (AWS)
Le Morne Brabant
Coteau Gambier
250215
260190
273184
265190
10
2
3
55
6.0
19.0
34.0
32.3
-20.2
13.7
-
2
5
7
7
0
2
3
2
0
0
0
1
0
0
0
0
0
0
0
0
3.0
7.2
9.0
10.0
1
4
4
4
STATIONS
REGION : NORTH WEST
* Often
-
Data not available
6
aws: automatic weather station
RAINFALL IN MAURITIUS
---
OCTOBER 2010
No of days on which RR
Maximum
reached or exceeded
Rainfall
1
5
10
25
50 in 24 hr
Date
mm mm mm mm mm
mm
Alt
Location
m
Total
mm
Dep.
from
Normal
Embrasure
Terres Couleurs
Chamarel ( Estate )
Plaine Champagne
REGION : SOUTH
268204 45
262220 259
262230 267
254258 701
16.0
16.0
109.9
-34.9
-41.0
-9.3
3
4
11
1
2
6
0
0
3
0
0
2
0
0
0
8.0
5.0
31.7
24
23
4
Beau Champs (B.O)
Bel Ombre
St Felix (Factory)
Terracine
Souillac (aws)
Choisy Estate
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
306308
310320
288223
290250
294241
295273
297315
300322
301330
302339
304322
274261
275273
289260
287319
265306
254312
249297
240295
21
8
24
30
28
70
125
46
53
94
86
82
49
64
305
236
168
175
439
475
600
605
29.0
39.4
28.0
22.0
35.0
42.2
34.4
46.0
40.0
51.0
40.0
28.0
32.0
71.0
99.0
34.0
58.0
86.0
153.7
159.1
163.4
-31.2
-2.9
-23.5
-12.5
-16.5
-11.0
-15.0
-18.4
-15.1
-13.0
-19.5
-23.1
-29.0
-33.5
-33.0
-13.9
-40.7
-21.8
-
6
8
6
8
6
6
6
6
6
8
6
6
6
7
8
6
9
11
17
11
14
3
3
2
1
3
4
3
4
3
3
3
2
3
5
7
3
6
6
8
6
6
1
1
1
0
2
1
0
2
2
3
2
1
1
3
3
1
3
4
6
4
5
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
2
3
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
10.0
13.0
13.0
5.4
10.2
18.0
9.4
13.0
13.0
19.0
12.0
10.0
11.0
25.0
33.0
11.0
15.0
20.0
35.2
42.6
38.2
4
24
24
1
3
3
3
4
24
27
27
27
24
3
3
4
24
4
24
24
24
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 15
204403 15
208417 21
215439 24
216420 6
220410 3
203413 20
251405 40
252416 21
257413 27
260424 9
271403 23
293378 31
211390 145
6.5
106.4
85.6
25.4
50.9
43.7
9.9
16.5
10.8
6.0
5.8
11.9
7.6
88.0
-46.5
-4.6
-23.1
-22.9
-38.1
-29.2
-40.5
-42.1
-38.3
-34.6
-44.4
-38.5
-18.8
1
14
10
5
8
8
2
3
4
3
3
5
2
13
1
3
3
2
3
3
1
2
0
0
0
0
1
5
0
3
2
1
2
1
0
0
0
0
0
0
0
3
0
2
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
6.5
37.4
41.0
12.3
21.0
14.2
5.9
8.0
4.6
3.2
2.2
3.7
6.6
32.0
4
4
4
24
4
4
24
4
24
24
4
24
24
4
STATIONS
REGION : SOUTH WEST
* Often
-
Data not available
7
aws: automatic weather station
RAINFALL IN MAURITIUS
STATIONS
Alt
Location
m
Total
mm
Dep.
from
Normal
---
OCTOBER 2010
No of days on which RR
Maximum
reached or exceeded
Rainfall
1
5
10
25
50 in 24 hr
Date
mm mm mm mm mm
mm
REGION : SOUTH EAST
Cent Gaulettes
Riviere des Creoles
Riche En Eau
Riche En Eau (aws)
Astroea (R.E.E)
Courbevoie
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
Rose Belle
Deux Bras
Hewetson
St. Avold
Joli Bois
Britannia
Riche Bois (B)
REGION : EAST
214384
220389
231394
233379
243400
254392
261410
264365
267389
276390
280371
284334
285380
288349
291365
293339
296349
201387
227363
232369
238355
239278
261341
262331
264349
271334
274346
145
134
110
163
69
73
50
160
58
49
76
168
49
107
58
122
76
216
213
287
280
158
255
293
216
229
191
78.9
53.5
43.0
45.5
48.2
24.2
28.0
14.9
26.0
22.6
18.6
22.1
34.3
13.2
30.3
18.6
32.0
31.5
133.5
36.5
84.7
42.2
54.5
74.1
47.1
63.3
37.9
-30.0
-40.4
-28.9
-49.2
-41.6
-41.3
-45.2
-53.9
-34.4
-33.8
-38.7
-34.0
-43.1
-29.3
-32.3
-36.1
-16.6
-11.8
-99.7
-33.9
-23.8
-71.9
-34.3
-46.6
-26.6
-37.6
13
9
10
9
12
5
4
5
8
6
5
7
9
2
7
5
6
6
12
6
12
6
11
12
11
12
9
4
2
3
3
3
1
1
0
2
1
1
1
4
2
2
1
3
3
6
2
8
2
4
4
4
4
2
2
2
2
3
2
1
1
0
0
0
0
0
0
0
1
0
1
0
3
1
2
2
2
2
1
3
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
38.0
20.2
13.5
13.5
14.0
12.5
17.8
3.1
7.0
6.1
7.0
8.6
8.0
8.2
10.0
7.1
10.0
9.4
55.5
18.9
27.2
19.2
13.5
20.0
11.7
14.0
10.2
4
4
26
26
4
24
24
22
4
24
24
24
25
24
24
24
27
27
4
24
4
24
4
27
4
27
4
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 18
82443
9
100441 6
102452 8
107424 40
116461 3
117451 20
138480 5
153472 3
164465 15
97404 113
116414 109
116439 43
8.1
16.0
18.5
20.5
26.0
8.0
14.0
10.5
10.6
11.6
34.5
26.0
18.5
-27.2
-25.0
-23.6
-16.6
-21.0
-34.3
-28.9
-35.3
-40.1
-20.5
-35.5
-34.0
2
1
4
4
6
1
2
4
2
2
5
4
5
1
1
1
1
1
1
1
1
1
1
2
1
1
0
1
1
1
1
0
1
0
0
0
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
6.3
16.0
13.0
14.0
13.5
8.0
13.0
5.0
7.2
7.0
19.0
19.0
13.0
4
4
4
4
4
4
4
4
4
4
4
4
4
* Often
-
Data not available
8
aws: automatic weather station
RAINFALL IN MAURITIUS
STATIONS
Alt
Location
m
Total
mm
Dep
from
Normal
---
OCTOBER 2010
No of days on which RR
Maximum
reached or exceeded
Rainfall
1
5
10
25
50 in 24 hr
Date
mm
mm mm mm mm mm
REGION : EAST
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
35.8
19.9
26.7
18.0
9.0
15.5
13.2
23.7
12.7
10.3
10.8
14.8
8.2
32.0
33.6
35.6
37.2
38.0
29.9
28.5
24.5
59.4
72.8
-26.4
-32.6
-45.1
-33.0
-44.4
-44.9
-51.8
-54.8
-59.6
-66.5
-38.0
-58.0
-53.5
-51.9
-49.0
-72.9
-67.6
-41.5
-59.4
-52.6
-47.1
-57.8
5
4
5
5
3
2
3
3
2
2
3
3
2
4
5
5
5
5
5
5
3
10
10
1
1
1
0
1
2
1
2
1
1
0
2
1
2
2
2
2
2
1
2
1
3
3
1
1
1
0
0
0
0
0
1
0
0
0
0
2
2
2
2
2
1
1
1
1
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
20.4
11.0
13.8
4.4
7.0
9.8
8.0
9.6
10.5
8.8
4.8
7.8
6.2
15.0
15.8
17.0
15.0
18.2
17.3
15.0
14.5
22.6
22.3
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
Bonne Veine (MDA)
Providence
Providence (aws)
Grosse Roche
Piton du Milieu
Eau Bleue Dam
Union Park ( MSIRI )
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
248334
110350
170335
174335
200320
433
369
378
335
442
347
357
360
480
476
467
590
70.7
77.4
83.2
63.0
40.8
149.9
136.2
110.6
87.0
79.3
70.6
126.8
-25.1
-24.5
-59.5
-97.2
-4.3
-2.9
-11.5
-45.7
-57.4
-
9
12
10
16
12
11
11
12
10
12
9
14
5
3
3
5
3
7
6
8
5
4
3
5
2
2
2
2
0
3
3
4
3
3
3
4
1
1
1
0
0
1
3
1
1
0
0
2
0
0
0
0
0
1
0
0
0
0
0
0
27.4
31.0
31.4
14.0
9.7
74.0
42.1
30.0
32.0
22.2
19.6
33.2
4
4
4
24
4
4
4
4
4
24
24
24
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
51.8
48.0
31.7
31.6
31.0
33.7
39.8
-32.7
-9.0
-9.6
-13.0
-28.4
-12.6
8
8
7
8
6
9
8
4
4
2
2
3
2
3
1
1
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
21.1
15.0
9.4
9.2
7.4
9.4
10.5
4
4
4
4
4
4
23
* Often
-
Data not available
9
aws: automatic weather station
RAINFALL IN MAURITIUS
STATIONS
---
OCTOBER 2010
No of days on which RR
Maximum
Dep
reached or exceeded
Rainfall
Alt. Total
Location
from
m
mm
1
5
10
25
50 in 24 hr
Normal
Date
mm
mm mm mm mm mm
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
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
22.5
30.0
33.5
9.5
14.1
19.9
17.6
61.9
74.7
44.1
65.5
24.6
83.4
65.8
63.6
42.9
105.9
87.3
149.6
113.4
119.4
-15.9
-24.2
-29.4
-16.3
-47.8
-11.8
-19.2
-33.3
-21.8
-35.9
-53.7
-25.8
-3.4
8.2
-19.4
-3.7
-7.9
15.8
-20.9
7
8
5
3
4
4
4
9
9
9
12
5
12
6
8
5
10
8
10
11
11
1
2
4
1
0
2
2
6
5
2
3
3
5
4
7
4
7
6
7
7
6
0
0
1
0
0
0
0
1
1
1
3
0
3
3
1
2
5
4
5
4
4
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
3
1
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
6.5
8.6
10.0
5.6
4.9
7.4
6.9
22.1
32.5
17.3
18.0
9.3
20.4
20.8
19.0
14.8
28.0
20.8
33.2
26.8
32.4
1
4
24
24
24
24
24
4
4
4
4
24
24
24
24
24
24
4
4
24
24
407255 58
454216 33
418265 335
45.3
28.9
120.2
4.6
-3.1
-
10
8
13
2
2
7
1
0
5
0
0
1
0
0
0
14.2
6.5
28.2
10
21
10
REGION : RODRIGUES
Pointe Canon
Corail Airport
Citronelle (aws)
REGION :
AGALEGA ISLANDS
Agalega
10º 21' S
56º 35' E
3
20.3
-48.8
8
0
0
0
0
4.8
3
16º 27' S
59º 37' E
4
17.6
-11.2
6
0
0
0
0
3.8
22
REGION :
ST. BRANDON ISLANDS
St. Brandon
* Often
-
Data not available
10
aws: automatic weather station
MEAN MONTHLY RAINFALL
OCTOBER 2010
Isohyetal Analysis ( mm )
REGION
NORTH
NORTH
WEST
HEIGHT
EAST
WEST
0 -- 40
14
14
15
5
40 -- 160
23
20
29
8
160 -- 320
37
37
58
320 -- 440
43
45
60
440 -- 600
75
600 -- 680
27
38
28
71
43
44
29
13
83
75
66
26
24
99
41
119
81
50
64
38
121
74
128
70
38
38
126
119
135
81
>680
Total Mean
CENTRAL PLATEAU SOUTH
SOUTH
SOUTH
Windward Leeward
EAST
WEST
125
22
27
35
9
108
125
63
50
71
Mean Rainfall over Mauritius : 47 mm
Percentage Rainfall of Long Term Mean : 67 %
October 2010 ended up with a slightly below normal rainfall amounting to 47 mm which represents
67% of the long-term mean of 1971-2000.
Very few rainy spells were noted during that month; only one significant rainfall episode extending
for 3 days was noted, namely from 23-25 when perturbed trades coupled with an unstable
atmosphere resulted into scattered showers. While on the 4, 5 and during the night of 20 an
instability line resulted into some scattered showers. Else the rest of the days were mainly dry
except for few night showers which were mostly concentrated over the Central Plateau region.
Most of the regions of the island had slightly below normal precipitation, except to the West, the
North and to the East where it was well below normal. The windward side of the Central Plateau
recorded the highest amount namely 108 mm. Both regions of the Central Plateau recorded the
highest percentage of rainfall that is 83%.
11
36
RAINFALL ANALYSIS - OCTOBER 2010
Expressed as a percentage of the mean
Isohyets in millimetres
10
Mon
Choisy
Mon
Choisy
15-50
10
25
Digue
Seche
Digue
Seche
Pamplemousses
Pamplemousses
50
Fort William
Fort William
50-100
FUEL
12
FUEL
Reduit
Reduit
Alma
Alma
Beau
Champ
Medine
15-50
Beau
Champ
Medine
10
Vacoas
100
Vacoas
Sans
Souci
Sans
Souci
Ferney
150
Plaisance
Le Morne
Ferney
Le Val
Le Val
Plaisance
Le Morne
Britannia
Bel Ombre
Britannia
Bel Ombre
15-50
METEOROLOGICAL SUMMARIES
OCTOBER 2010
Monthly Data from Climatological Stations
288
33
9.3 12.0
163
77 63 44 31 135
28.2 10,11 15.4 11 75 67 35 31
27.2 30 15.5 11 92 74 62 10
30.4 24 15.9 10
27.5 * 17.8 10
29.0 28,29 18.0 1
203
27.1 29 16.2 10
27.1 29 13.1 11
34.1 6 20.7 1
31.5 21 15.0 *
31.0 19 17.5 11 89 55 40 20 198
29.5 28 15.5 1
63 56 45 20
32.0 27 16.0 *
28.5 11,31 19.6 23 91 69 50 31
26.8 28 14.8 1
aws: automatic weather station
31
2
-
8.2 23 264
6.0 3,22 239
224
217
16
40
14
16
8.5
7.7
7.2
7.0
26
27
26
29
22
8.0 4,22 256
229
211
17
32
25
8.3 11.4 8,10
7.4 11.1 26
6.8 11.3 10
5
9.0
11.4
10.2
10.4
11.1
Depth 100cm
-
Depth 50cm
-
MEAN SOIL
TEMP (ºC)
Depth 30cm
19.3 1.4 22.8 1.1
18.2 1.4 21.7 1.1
19.6 0.6 23.8 1.8
20.9 1.3 23.9 1.2
21.3 2.0 24.2 1.8
17.9 0.5 21.7 0.6
16.3 0.6 20.3 0.9
22.1
26.0
18.3
24.4
19.9 1.3 24.6 1.4
18.3 1.1 23.1 1.0
18.4
24.2
21.3 3.7 24.0 2.4
16.4
20.0
- Data not available
-
Date
0.8
0.7
3.0
1.0
1.5
0.8
1.2
3.2
1.5
0.9
1.0
-
-
Daily Maximum
26.2
25.2
27.9
26.9
27.1
25.4
24.2
29.8
30.4
29.3
27.9
29.9
26.7
23.6
Mean Daily
11
11
-
Departure from Normal
Date
18.0
15.5
-
Total Sunshine
Lowest Minimum
14
31
-
Date
Date
32.0
31.5
-
Max. Evaporation
Highest Maximum
1.3
1.2
-
Daily
Departure from Normal
25.9
24.5
-
BRIGHT SUNSHINE
( Hrs )
Departure from Normal
Mean Temperature
1.1
1.5
-
EVAPORATION
( mm )
Total Evaporation
Departure from Normal
21.5
20.4
-
Date
Mean Minimum
1.4
0.9
-
Lowest Relative Humidity
Departure from Normal
30.2
28.5
-
Mean Relative Humidity ( PM )
Mean Maximum
13
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
RELATIVE
HUMIDITY ( % )
Mean Realtive Humidity ( AM )
TEMPERATURE
(ºC)
STATIONS
.
26
284 42.7 9.2 11.5
22
279 50.6 9.0 10.9 10,11
236 7.6 10.8 26
261 10 8.4 10.8 22
METEOROLOGICAL
SUMMARIES
OCTOBER 2010
Monthly Data from Agrometeorological Stations
TEMPERATURE
(ºC)
* Often
Date
Total Evaporation
Departure from Normal
Total Sunshine
Departure from Normal
Mean Daily
30.5
31
14.4
12
-
-
-
-
171
-4
7.0 14,26 268
13
8.6 11.8
26
25.0 24.8
28.6
3.8
19.0
2.1
23.8
3.0
30.6
22
15.5
5
76
72
61
20
147
-5
7.0
22
267
20
8.6 11.6
22
27.3 24.9 24.8
25.4
1.6
18.4
3.1
21.9
2.4
27.0
31
14.0
11
81
71
58
24
108
-5
5.5
31
233
24
7.5 10.5 10,26 22.9 22.2 22.3
25.7
2.1
17.6
1.2
21.7
1.7
29.5
30
15.4
11
80
75
60
31
125
0
6.0 29,31 214
33
6.9 11.4
10
27.1
1.2
19.8
1.0
23.5
1.1
29.8
27
17.4
11
85
66
56
8
174 -10
9.2
37
8.5 11.5
26
- Data not available
10
265
Depth 100cm
Lowest Relative Humidity
0.3
Depth 50cm
Mean Relative Humidity ( PM )
23.3
Depth 30cm
Mean Realtive Humidity ( AM )
0.2
Date
Date
17.9
Daily Maximum
Lowest Minimum
Max. Evaporation
Date
0.3
Date
Highest Maximum
28.7
Daily
Departure from Normal
La Baraque
Mean Temperature
Union Park
MEAN SOIL
TEMP (ºC)
Departure from Normal
Belle Rive
BRIGHT SUNSHINE
( Hrs )
Mean Minimum
Reduit
EVAPORATION
( mm )
Departure from Normal
14
Pamplemousses
RELATIVE
HUMIDITY ( % )
Mean Maximum
STATIONS
21.9 21.6 21.9
METEOROLOGICAL
SUMMARIES
OCTOBER 2010
Monthly Data from Synoptic Stations
Departure from Normal
Daily Max. Evaporation
Date
13.8 11 89 70 81
1
51
31
3
963.2 10 254 17 8.2 11.1 10 139 -8
6.7
22
Rodrigues
26.7 0.4 21.3 1.2 24.0 0.8 28.5 11,31 19.6 23 81 73 77
3
52
28 1017.4 -1.2 1019.4 20 1009.8 10 261 -15 8.4 12.1 30 164 -41
7.0
*
St.Brandon
28.1 1.4 23.5 1.1 25.8 1.3 29.8
13
21.9 2
80 73 77
-3
58
21 1015.3 -1.2 1016.5 15,20 1010.7 10
Agalega
30.7 1.3 24.0 0.7 27.4 1.0 32.0
30
21.9 31 79 70 76
-3
50
31 1012.7 -0.2 1014.0 8,30 1011.3 10 259
15
*
Often
-
Data not available
**
968.7 -1.1 970.6
Mean from main synoptic hours
-
*** Station level pressure
8.4 11.1 15
Total Evaporation
29
Date
Mean Daily
25.0 0.9 17.6 1.1 21.3 1.0 26.6
Daily Maximum
Departure from Normal
Vacoas ***
Date
Total Sunshine
Lowest Mean MSL Pressure
29
Date
9.0
Difference from Normal
7.8 11.3 26 212 39
Mean MSL Pressure **
Date
4
Date
1012.1 10 241
Lowest Minimum
3
Date
10 1017.9 -0.7 1020.0
Highest Maximum
54
Departure from Normal
-4
Mean Temperature
17.2 11 79 67 73
Departure from Normal
29
Mean Minimum
27.5 1.1 20.7 1.5 24.1 1.3 29.1
Departure from Normal
Plaisance
Mean Maximum
Lowest Relative Humidity
BRIGHT SUNSHINE EVAPORATION
( Hrs )
( mm )
Difference from Normal
Highest Mean MSL Pressure
BAROMETRIC PRESSURE
( hPa )
Mean Relative Humidity **
Mean Relative Humidity ( PM )
RELATIVE HUMIDITY
(%)
Mean Relative Humidity ( AM )
TEMPERATURE
(ºC)
STATIONS
MEAN SEA SURFACE TEMPERATURE - OCTOBER 2010
30°C
28°C
26°C
16
24°C
22°C
20°C
18°C
30°C
SURFACE WIND - OCTOBER 2010
Wind Rose (% Frequency)
PLAISANCE
VACOAS
9
1
17
5
2
Calm
1
1
Calm
0
1
43
48
2
3
Mean Wind Speed
Maximum Gust
Date
1
21
5
(ms-1) 8.6
(ms-1) 15.2
FORT - WILLIAM
2
3
1
37
(ms-1) 3.6
(ms-1) 14.7
Mean Wind Speed
Maximum Gust
Date
2
2
18
ST. BRANDON
5
1
2
Calm
2
2
1
1
3
Calm
0
3
33
6
7
7
52
30
40
Mean Wind Speed
Maximum Gust
Date
(ms-1) 3.2
(ms-1) 14.4
Mean Wind Speed
Maximum Gust
Date
18, 25
RODRIGUES (Pte. Canon)
1
(ms-1)
(ms-1)
AGALEGA
2
2
1
Calm
1
1
6.2
-
Calm
2
35
4
1
3
9
8
46
25
Mean Wind Speed
Maximum Gust
Date
FREQ:
0
20
40
(ms-1) 6.3
(ms-1) 20.1
Mean Wind Speed
Maximum Gust
Date
26
60
80
100
17
(ms-1)
(ms-1)
4.1
-
59
UPPER WIND OBSERVATIONS - OCTOBER
2010
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
115 10
140 06
250 07
275 15
285 30
295 39
295 37
290 27
026 08
-
-
-
-
-
-
-
-
-
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
100 25
090 25
260 29
300 49
300 58
310 77
300 71
320 59
300 35
-
-
-
-
-
-
-
-
-
VACOAS*
RODRIGUES***
Absolute Maximum Wind
STATION
VACOAS*
RODRIGUES***
Deg kt Height (m)
Date
310 81
12304
26
-
-
-
*
- Upper wind observations in the morning
*** - Data not available
18