WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
25th OF AUGUST 2026 AT 08:30 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 251000 TO 261000 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 from mid-period.
2. CAPE WEST: E to SE 35 in the north-east, spreading southwards from mid-
period.
3. CAPE EAST: W to SW 35 to 40 in the south.
4. MARION FORTIES EAST: W to SW 35 to 45.
SYNOPTIC CHART 06:00Z
=====================
High 1030 hPa 42s09e, High 1024 hPa 27s38e.
Low 1014 hPa 24s09e, Low 1002 hPa 52s14w, Low 994 hPa 44s59e, Low 948 hPa 55s50e.
1. Cold front: 30s14w 35s11w 40s10w 47s7w into 52s14w.
2. Cold front: 37s35e 38s45e 40s52e 43s60e into 44s59e.
3. Cold front: 42s36e 43s41e 47s50e 52s52e into 55s50e.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : S to SE 10 to 20.
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 4.5m 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, reaching 25 in the south-east at
first.
VIS : Good, but moderate in showers and thundershowers in the extreme
north-east.
TRISTAN (30S/40S, 00E/20W):
WIND : N to NW 20 to 30, reaching 35 in the south-west from 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 towards end
of the 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, but 25 to 35 in the north-east, spreading
south from mid-period. It will be N to NE 15 to 25 in the west.
VIS : Good, but moderate in showers and rain in the west.
SEA STATE: 3.0 to 4.0m in the east, reaching 4.5 to 5.0m in the extreme east,
with W to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : W to SW 20 to 30, reaching 35 to 40 in the south, but NW 20 to 30
in the extreme north-east. It will become E to SE 15 to 25 in the
extreme west from mid-period.
VIS : Good in the south-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 end of the period, while reaching 8.0
to 9.0m in the south, with SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : Variable 05 to 10 in the north until mid-period, otherwise W to SW
15 to 25, while cyclonic 10 to 20 in the north-east from mid-
period. It will become S 10 to 20 in the west towards end of the
period.
VIS : Good but moderate in showers and rain in the south-west towards
mid-period, spreading to the south-east in the second half of the
period. It will become moderate in showers and thundershowers in
the north-east towards end of the period.
SEA STATE: 3.0 to 4.0m except in the north-west, while reaching 4.5 to 5.0m
in the extreme south, with S to SW swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 10 to 20.
VIS : Good.
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.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to SW 35 to 45.
VIS : Moderate to poor in showers and thundershowers with snow showers
in the south.
SEA STATE: 7.5 to 8.5m, but 9.0 to 10.0m in the west, with W to SW swell.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
26/08/25 AT 0600UTC
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 OVER CRO.
- GALE FORCE 8 SUR WAM ET KER;
PART 2: GENERAL SYNOPSIS, 26/08/25 AT 0000UTC
- THUNDERY LOW 1013 NEAR 33S/59E, MOVING EASTWARD LIFTING.
- COLD FRONT OVER CRO, RAPIDLY MOVING EASTWARD.
PART 3: FORECAST FOR 24 HOURS FROM 26/08/25 AT 0600UTC TO 26/08/26 AT 0600UTC
WAM (30S/40S, 50E/65E)
THUNDERY SHOWERS OVER NORTHERN. FRONTAL RAIN AND SHOWERS OVER FAR SOUTHERN SOON.
WIND: CLOCKWISE 3 TO 4 OVER NORTHERN AT TIMES 5, BUT WESTERLY 6 TO 7 WITH
GUSTS OVER SOUTHERN, INCREASING 8 OVER SOUTH-WESTERN LATER. GUSTS.
SEA : MODERATE TO ROUGH, BECOMING GRADUALLY VERY ROUGH TO HIGH OVER SOUTHERN
BY LONG SW SWELL INCREASING 4 TO 6M.
VIS : POOR TO VERY POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
SCATTERED SHOWERS.
WIND: ANTICLOCKWISE 3 TO 4 OVER NORTH-EASTERN SETTING-UP NORTH-WESTERLY 4 TO
5 ELSEWHERE, 6 OVER SOUTHERN AREA. NORTH-WEST 7 BY SOUTH-WESTERN AT
END.
SEA : MODERATE TO ROUGH, BECOMING VERY ROUGH BY SOUTH-WESTERN AT END. SW
SWELL 4 TO 5 M BY SOUTH-WESTERN LATER.
VIS : POOR TO VERY POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
FRONTAL RAIN AND SHOWERS.
WIND: WESTERLY TO NORTH-WEST 7 TO 8, AT TIMES 9. GUSTS.
SEA : VERY ROUGH TO HIGH, BECOMING HIGH ALL OVER THE AREA SOON.LONG SW SWELL
5 TO 7M.
VIS : VERY POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
FRONTAL SHOWERS.
WIND: NORTH-WESTERLY 6 TO 7 AT TIMES 8. GUSTS.
SEA : BECOMING VERY ROUGH TO HIGH. LONG WESTERLY SWELL INCREASING 5 TO 7M.
VIS : POOR OR VERY POOR IN PRECIPITATION.