WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
25th OF AUGUST 2026 AT 17:30 UTC.
FOR SOUTH-EAST SECTOR OF METAREA. VII, PREPARED BY REUNION, SEE AREA
2 BELOW.
NOTE: WX OBSERVATIONS.
======================
COULD ALL VESSELS EXPERIENCING UNEXPECTED, SEVERE WX/SEA STATE PLEASE
MAKE EVERY EFFORT TO REPORT THIS TO SAWS VIA CAPE TOWN RADIO.
AREA 1:
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FORECAST VALID FROM 252200 TO 262200 UTC:
WIND IN KNOTS, WAVE HEIGHTS IN METERS. NO SEA STATE GIVEN IF WAVES LESS
THAN 3M.
NOTE THE WIND SPEEDS QUOTED HERE ARE THE EXPECTED AVERAGE SPEEDS.
INDIVIDUAL GUSTS MAY EXCEED THESE VALUES BY A FACTOR OF UP TO 1.5.
WAVE HEIGHTS ARE SIGNIFICANT WAVE HEIGHTS, WHICH MAY BE ACCOMPANIED BY
INDIVIDUAL WAVES 1.5 TO 2.0 TIMES HIGHER.
GALE FORCE WARNINGS:
====================
1. TRISTAN: N to NW 35 in the south-west until mid-period.
2. CAPE WEST: E to SE 35 in the extreme east, while N to NE 35 in the
extreme north-west towards end of the period.
3. CAPE EAST: W to SW 35 in the south.
4. MARION FORTIES EAST: SW 35 to 40, reaching 45 in the south.
SYNOPTIC CHART 12:00Z
=====================
High 1030 hPa 44s09e, High 1022 hPa 25s38e.
Low 984 hPa 45s30w, Low 990 hPa 50s24w, Low 1004 hPa 49s08w, Low 1014 hPa 25s13e, Low 944 hPa 57s54e.
1. Cold front: 33s19w, 40s17w, 45s20w, 47s30w into 45s30w.
2. Cold front: 33s10w, 40s06w, 46s06w into 49s08w.
3. Cold front: 36s40e, 36s45e, 37s50e, 40s56e into 44s65e.
4. Cold front: 40s35e, 41s41e, 42s50e, 45s55e, 50s58e, 55s60e into
57s54e.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : S to SE 05 to 15.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SW 05 to 15 but SE 10 to 20 in the south-west.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : E to SE 10 to 20 in the north, otherwise W to NW 15 to 25.
VIS : Good but moderate in showers and thundershowers in the south-
west.
SEA STATE: 3.0 to 4.0m in the south-west, reaching 4.5 to 5.0m in the
extreme south-west, with SW swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : Variable 05 to 10 in the north-east and extreme south-west,
otherwise S to SE 10 to 20, spreading to the north-east from
mid-period.
VIS : Good, but moderate in showers and thundershowers in the
extreme north-east at first.
TRISTAN (30S/40S, 00E/20W):
WIND : N to NW 20 to 30, reaching 35 in the south-west until mid-
period.
VIS : Moderate to poor in showers and thundershowers, except in the
extreme north-east.
SEA STATE: 3.0 to 4.0m in the west, spreading to the south-east by mid-
period, while reaching 5.5 to 6.5m in the extreme west, with W
to NW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : E to SE 10 to 20, reaching 25 to 35 in the extreme east, while
becoming NE 20 to 30 in the south-east from mid-period. It
will be N to NE 15 to 25 in the west, reaching 35 in the
extreme north-west towards end of the period.
VIS : Good, but moderate in showers and rain in the south-west.
SEA STATE: 3.0 to 4.0m in the east, reaching 4.5 to 5.0m in the extreme
east, with S to SE swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : W to SW 20 to 30, reaching 35 in the south, but NW 20 to 30
in the extreme north-east until mid-period. It will be E to NE
15 to 25 in the extreme west.
VIS : Good in the west, otherwise moderate in showers and rain.
SEA STATE: 4.0 to 5.0m in the extreme west and north, otherwise 6.0 to
7.0m, spreading northwards towards mid-period, while reaching
8.0 to 9.0m in the south, with SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : W to SW 15 to 25, while cyclonic 10 to 20 in the north-east.
It will become S to SE 15 to 25 in the west by mid-period.
VIS : Good but moderate in showers and rain.
SEA STATE: 3.0 to 4.0m except in the north-west, but 4.5 to 5.0m in the
south, reaching 6.0 to 6.5m in the extreme south from mid
period, with S to SW swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 15 to 25, but SW 05 to 15 in the north-east towards
end of the period.
VIS : Good.
SEA STATE: 3.0m in the south-east towards end of the period, with S
swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20, but N to NE 10 to 20 in the south.
VIS : Good but moderate in showers and rain in the north.
SEA STATE: 3.0m in the extreme south towards end of the period, with S
swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : SW 30 to 40, reaching 45 in the south.
VIS : Moderate to poor in showers and thundershowers with snow
showers in the south.
SEA STATE: 7.5 to 8.5m, but 9.5 to 10.5m in the west, spreading eastwards
from mid-period, with SW swell.
AREA 2:
=======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA
ACK (AMSTERDAM-CROZET-KERGUELEN)
26/08/25 AT 1700UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- STRONG GALE FORCE 9 TO STROM FORCE 9 TO 10 OVER KER.
- STRONG GALE FORCE 9 OVAR CRO.
- GALE FORCE 8 OVERWAM.
PART 2: GENERAL SYNOPSIS, 26/08/25 AT 1200UTC
HIGH 1027 NEAR 30S/80E, MOVING EASTWARDS.
CF FRONT AXIS 30S/65E, 35S/64E, MOVING EASTWARDS.
WAVYNG FRONT CG AXIS 38S/53E, 47S/79E, MOVING VERY RAPIDLY EASTWARDS
WITH THE FORMATION OF TWO LOW, EXPECTED THE 26/08 AT 12:00 UT: 959 HPA
NEAR 49S/67E AND 973 HPA NEAR 45S/70E
PART 3: FORECAST FOR 24 HOURS FROM 26/08/25 AT 1800UTCTO 26/08/26 AT
1800UTC
WAM (30S/40S, 50E/65E)
RAIN AND FRONTAL SHOWERS, CG LOC GRAIN.
WIND: WESTERLYTO NORTH-WESTERLY 4 TO 7 FROM NORTH TO SOUTH, SOON
INCREASING NORTH-WESTERLY 5/6 IN NORTH AND 7/8 WITH VIOLENT GUSTS
IN SOUTH, THEN LATER IN THE WEST, BACKING WEST TO SOUTH-WESTERLY
5/6 IN NORTH AND 7/8 IN SOUTH.
SEA : BECOMING VERY ROUGH TO HIGHFROM NORTH TO SOUTH. LONG SOUTH-WEST
SWELL3 TO 6 M.
VIS : POOR TO VERY POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
RAIN AND FRONTAL SHOWERS (CF IN THE NORTH AND CG IN THE SOUTH), LOC GRAIN.
WIND: NORTH-WESTERLY 5/6, INCREASING DURING THE DAY 6/7 IN THE SOUTH.
SEA : MODERATE TO ROUGH,BECOMING VERY ROUGH TO HIGH IN THE SOUTH-WEST
HALF. LONG SOUTH-WESTERLY SWELL 3 TO 5 M IN THE SOUTH-WEST HALF.
VIS : POOR TO VERY POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
RAIN AND FRONTAL SHOWERS. (CG) LOCALISED HAIL, SNOW IN THE SOUTH.
WIND: WESTERLY TO NORTH-WESTERLY, FORCE 7 TO 8, WITH STRONG GUSTS AHEAD
OF THE FRONT, BACKING WESTERLY TO SOUTH-WESTERLY 7/8 BEHIND,
REACHING LOCALLY 9 IN THE NORTH. TEMPORARY CLOCKWIZE 6/8 IN THE
SOUTH-EAST THIS MORNING.
SEA : HIGH, BECOMING VERY HIGHIN THE SOUTH-WEST AT END. LONG
SOUTH-WESTERLY SWELL 4 TO 8 M.
VIS : VERY POOR.
KER (40S/50S, 65E/80E)
RAIN AND FRONTAL SHOWERS. (CG) LOCALISED HAIL, SNOW IN THE SOUTH.
WIND: NORTH-WESTERLY 6/7, REACHING LOCALLY 8 IN THE SOUTH, INCREASING
DURING THE DAY BY WEST, NORTH-WESTERLY THEN WESTERLY 7/8, REACHING
9/10 NEAR THE LOW. VIOLENT GUSTS.
SEA : VERY ROUGH TO HIGH, BECOMING HIGH. LONG WEST TO SOUTH-WEST SWELL 3
TO 7 M.
VIS : VERY POOR.