WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
30th 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 301000 TO 311000 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: NW to W 35 in the south-west at first.
2. CAPE EAST: N to NW 35 in the south-east at first.
3. MARION FORTIES EAST: NW 35 in the north-east until mid-period.
SYNOPTIC CHART 06:00Z
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High 1033 hPa 32s03w High 1040 hPa 33s60e.
1. Cold front: 33s25e 37s33e 43s37e into 46s35e.
AREA FORECAST:
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ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 15 to 25.
VIS : Good.
SEA STATE: 3.0 to 3.5m, with SE swell.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 10 to 20, but SE 05 to 10 in the extreme east.
VIS : Good.
SEA STATE: 3.0m in the south-west spreading to the south-east by
mid-period, with S swell.
ST HELENA (15S/30S, 00E/20W):
WIND : E to SE 15 to 25 but E to NE 05 to 15 in the south-west.
VIS : Good.
SEA STATE: 3.0 to 3.5m, except in the south-west subsiding in the south-
east by mid-period, with S to SE swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 15 to 25 reaching 30 in the south-east.
VIS : Good.
SEA STATE: 3.0 to 4.0m subsiding in the extreme south-west by the end of
the period, with S to SE swell.
TRISTAN (30S/40S, 00E/20W):
WIND : Anticyclonic 05 to 10 in the north-east, otherwise NW to
W 20 to 30 reaching 35 in the south-west at first. It will
become SW to S 05 to 15 in the south-west towards mid-period.
VIS : Good but moderate in showers and rain the south-west spreading
to the south-east by mid-period.
SEA STATE: 3.0 to 4.0m except in the north reaching 4.5 to 5.0m in the
south-west drifting to the south-east by mid-period, with NW
to W swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : Anticyclonic 05 to 10 in the north-west, otherwise NW to W 20
to 30, but SE 10 to 20 reaching 25 in the north-east.
VIS : Good.
SEA STATE: 3.0 to 4.0m except in the north-west reaching 4.5m in places
in the extreme south, with SW to W swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : N to NW 20 to 30 reaching 35 in the south-east at first, but W
to SW 05 to 15 in the west spreading to the east from mid-
period while reaching 20 to 25 in the south-west towards mid-
period.
VIS : Good but moderate to poor in showers and thundershowers in
places in the central parts and eastern parts.
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 5.0m in the extreme south-east at
first, with SW to W swell but N to NE swell in the east.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : NW 05 to 15 in the western and central parts, otherwise N to
NE 20 to 30, but SW 05 to 15 in the south-west reaching 20 to
25 at first.
VIS : Good but moderate to poor in showers and thundershowers in the
extreme south-east during the morning.
SEA STATE: 3.0 to 3.5m subsiding towards the end of the period, with E to
NE swell.
MOZAMBIQUE CHANNEL:
WIND : E to SE 05 to 15 reaching 20 in the north, but E to NE 05 to 15 in
the central and southern parts at first.
VIS : Good.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 15 to 25 but E to NE 10 to 20 in the south.
VIS : Moderate in showers and rain.
SEA STATE: 3.0 to 4.0m reaching 4.5m in the extreme north-east at first
,with S to SE swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : NW to N 30 to 35 in the north-east until mid-period otherwise
W to SW 15 to 25. It will become NW to N 15 to 25 in the west
by mid-period spreading to the east towards the end of the
period while reaching 30 in the west.
VIS : Good but moderate in showers and rain in the east clearing
from the south towards mid-period, with possible drifting snow
in the south.
SEA STATE: 3.0 to 4.0m reaching 4.5 to 5.5m in the east until mid-period,
with NW to W swell.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
2026/08/30 AT 0500UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40% STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE OVER CRO AND KER.
PART 2: GENERAL SYNOPSIS, 26/08/30 AT 0000UTC
- HIGH 1039 HPA NEAR 34S/58E, STEADILY MOVING EASTWARD.- WAVING FRONT OVER CRO AND SOUTHERN KER, OVERFLOWING OVER SOUTH-WESTERN WAM AT END.
PART 3: FORECAST FOR 24 HOURS FROM 26/08/30 AT 0600UTC TO 26/08/31 AT 0600UTC
WAM (30S/40S, 50E/65E)
FRONTAL RAIN, SHOWERS AND SQUALLS OVER FAR SOUTH-WESTERN AT END.
WIND: ANTICLOCKWISE 3/4 OVER NORTHERN AT TIMES 5, BUT INCREASING NW 5/6
OVER SOUTHERN AT TIMES 7 WITH GUSTS.
SEA: MODERATE TO ROUGH, BECOMING SOON VERY ROUGH OVER FAR SOUTHERN.
VIS: GOOD, BUT VERY POOR IN PRECIPITATION OVER FAR SOUTH-WESTERN AT END.
AMS (30S/40S, 65E/80E)
SCATTERED SHOWERS OVER SOUTHERN.
WIND: ANTICLOCKWISE 3/4 AT TIMES 5, BUT W 5/6 WITH GUSTS OVER FAR
SOUTHERN.
SEA: ROUGH TO VERY ROUGH FROM WEST TO EAST BY SW SWELL 3 TO 4M ABATING,
BECOMING GRADUALLY MODERATE TO ROUGH.
VIS: MAINLY GOOD, BUT MODERATE IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
FRONTAL RAIN AND SHOWERS.
WIND: NW 6/7 NORTH OF FRONT AT TIMES 8, BACKING SW 5/6 SOUTH OF FRONT AT
TIMES 7 DECREASING 4/5 IN WEST AT END. GUSTS.
SEA: ROUGH TO VERY ROUGH AT TIMES HIGH OVER EASTERN LATER.
NORTH-WESTERLY SWELL 4 TO 5M SPREADING GRADUALLY FROM THE SOUTH-
WEST
VIS: POOR OR VERY POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
FRONTAL RAIN AND SHOWERS OVER SOUTHERN.
WIND: WESTERLY 6/7 AT TIMES 8.GUSTS.
SEA: ROUGH TO VERY ROUGH, BECOMING VERY ROUGH TO HIGH OVER SOUTHERN.
NORTH-WESTERLY SWELL 4 TO 5M OVER SOUTH-WESTERN AT END.
VIS: POOR IN PRECIPITATION.