WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
26th 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 261000 TO 271000 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: W to NW 35 in the south-west at first.
2. CAPE EAST: E to NE 35 in the extreme north-west and S to SW 35 in the
south-east.
3. MARION FORTIES EAST: SW 35 to 40 reaching 45 in the south.
SYNOPTIC CHART 06:00Z
=====================
High 1033 hPa 43s19e.
Low 988 hPa 48s10w.
1. Cold front: 32s07w 35s03w 40s01w 45s01w 47s04w into 48s10w.
AREA FORECAST:
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ASCENSION (06S/15S, 00E/20W):
WIND : S to SE 10 to 15.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SW 05 to 10 but SE 10 to 15 in the south-west.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : E to SE 10 to 15 in the north, otherwise W to NW 15 to 25.
VIS : Good but moderate in showers in the south-west.
SEA STATE: 3.0 to 4.0m in the west reaching 4.5m in the south-west, with SW
swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : Variable 05 to 10 in the north-east at first, otherwise S to SE 10
to 20.
VIS : Good.
TRISTAN (30S/40S, 00E/20W):
WIND : W to NW 20 to 30 reaching 35 in the south-west at first.
VIS : Moderate to poor in showers and thundershowers.
SEA STATE: 3.0 to 4.0m reaching 5.0 to 6.0m in the west spreading to the
central parts by end of the period, with SW to W swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : E to SE 10 to 20 in the east reaching 25 to 30 in the south-east,
otherwise N to NW 10 to 20 reaching 25 in the south-west.
VIS : Good, but moderate in showers and rain in the south-west.
SEA STATE: 3.0 to 4.0m in the south-east, with S to SE swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : E to NE 20 to 30 in the west reaching 35 in the extreme north-
west, otherwise S to SW 20 to 30 reaching 35 in the south-east. It
will become variable over the central parts by mid-period.
VIS : Moderate in showers and rain in the east, otherwise good.
SEA STATE: 4.0 to 5.0m reaching 6.0 to 8.0m over the central and eastern
parts, 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 but 5.0 to 6.0m in the south, with S to SW swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 15 to 25 reaching 30 in the south-east.
VIS : Good.
SEA STATE: 3.0 to 3.5m over the central and southern parts, with S swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20 but N to NE 10 to 15 in the south.
VIS : Good but moderate in showers in the extreme south.
SEA STATE: 3.0m in the south from mid-period, with SW swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : SW 30 to 40 reaching 45 in the south. It will become anticyclonic
05 to 15 in the north-west towards the end of the period.
VIS : Moderate to poor in showers and thundershowers with snow showers
in the south.
SEA STATE: 8.0 to 10.0m, subsiding to 5.0 to 6.0m in the west from mid-
period, with SW swell.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
26/08/26 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 TO STROM EXPECTED OVER KER.- STRONG GALE FORCE 9 OVAR
CRO.- GALE OVER FAR SOUTHERN
PART 2: GENERAL SYNOPSIS, 26/08/26 AT 0000UTC
- COLD FRONT OVER KER LEAVING THE AREA SOON.- DEEPENING LOW RAPIDLY,
972 HPA NEAR 48S/61E, EXPECTED 957 HPA NEAR 49S/66E SOON.
PART 3: FORECAST FOR 24 HOURS FROM 26/08/26 AT 0600UTC TO 26/08/27 AT 0600UTC
WAM (30S/40S, 50E/65E)
RAIN AND FRONTAL SHOWERS,
WIND:W TO SOUTHWEST 5 TO 6 IN NORTH, 6 TO 7 IN SOUTH. GUSTS.
SEA: VERY ROUGH TO HIGH FROM NORTH TO SOUTH. LONG SOUTH-WEST SWELL 3 TO 6 M.
VIS: POOR TO VERY POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
RAIN AND FRONTAL SHOWERS. SQUALLS.
WIND: NW 5/6 AHEAD THE FRONT BACKING W AND INCREASING 6/7 OVER SOUTHERN AREA. GUSTS.
SEA: MODERATE TO ROUGH, BECOMING VERY ROUGH TO HIGH BY SOUTHWESTERN AREA. LONG SW SWELL 3 TO 5 M.
VIS: POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
RAIN AND FRONTAL SHOWERS. LOCALLY, LOCALISED SQUALLS, SNOW IN THE SOUTH. GUSTS.
WIND: INCREASING W THEN SW 7/8, AT TIMES 9 OVER EASTERN AREA AT FIRST.
SEA: MAINLY HIGH. LONG SOUTH-WESTERLY SWELL 4 TO 6M.
VIS: VERY POOR IN PRECIPITATIONS.
KER (40S/50S, 65E/80E)
RAIN AND FRONTAL SHOWERS LOCALLY SQUALLS, SNOW IN THE SOUTH. VIOLENT GUSTS.
WIND:- IN NORTH: INCREASING NW 7/8 AT TIMES 9 IN THE FRONT AND BACKING W 7/8 BEHIND.- IN SOUTH: CLOCKWISE 7/8, LOCALLY 9/10, SETTING UP W 4 TO 6 LOCALLY W 7/8.
SEA: VERY ROUGH TO HIGH, BECOMING HIGH. LONG WEST TO SOUTHWEST SWELL 3 TO 7M.
VIS: VERY POOR