WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
27th 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 271000 TO 281000 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. CAPE EAST: E to NE 35 in the north-west at first.
2. DURBAN EAST: NE to E 35 in the extreme south-west until mid-period.
SYNOPTIC CHART 06:00Z
=====================
High 1022 hPa 24s04w, High 1036 hPa 41s34e.
Low 1017 hPa 36s15e, Low 993 hPa 44s11w.
1. Cold front: 29s18w 32s11w 36s05w 43s03w 44s12w into 44s11w.
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 but
variable 05 over the central parts and SW in the west while
spreading to the central parts it will become S to SE in the west
and central parts by end of period.
VIS : Good but moderate in showers in the south-west.
SEA STATE: 3.0 to 4.0m in the west and south, spreading to the south-east by
end of period while reaching 4.5m in the central parts, with SW
swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : 05 to 15 NW in the south-west, where it will become SW by end of
period, otherwise S to SE 10 to 20.
VIS : Good.
TRISTAN (30S/40S, 00E/20W):
WIND : W to NW 20 to 30 but SW 20 to 30 in the west spreading to the
eastern parts by mid-period.
VIS : Moderate in showers and thundershowers.
SEA STATE: 3.0 to 4.0m reaching 5.0m in the west and central parts,
spreading to the east by end of period while subsiding in the
west, with SW to W swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : E to NE 20 to 30 in the south-east at first, otherwise SW 05 to 15
but N to NW 15 to 25 in the west, spreading to the central parts
while becoming SW 15 to 25 in the west by end of period.
VIS : Good, but moderate in showers and rain in the west, spreading to
the central parts by end of period.
SEA STATE: 3.0 to 3.5m in the south-east and extreme west, becoming 4.0 to
4.5m in the south-west by end of period, with S to SE swell but W
swell in the extreme west.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : E to NE 20 to 30 in the west reaching 35 in the north-west at
first, but S to SW 20 to 30 in the extreme east, otherwise
anticyclonic 05 to 15 spreading to the east while becoming NW to W
05 to 15 in the west towards end of period.
VIS : Moderate in showers and rain in the east at first, otherwise good.
SEA STATE: 4.0 to 5.0m, reaching 6.0 to 8.0m in the east where it will be
subsiding towards end of period, with S to SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : S to SW 15 to 25 but NE to E 15 to 25 in the west reaching 30 to
35 in the extreme south-west until mid-period.
VIS : Good but moderate in showers in the east.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m over the central and eastern
parts, with S to SW swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 15 to 25 reaching 30 in the south-east and NW 15 in the
central-east.
VIS : Good.
SEA STATE: 3.0 to 4.0m over the central and southern parts reaching 5.0m in
the south-east, with S swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20 reaching 30 in the north-west.
VIS : Good but moderate in showers in the south, drifting to the central
parts by end of period.
SEA STATE: 3.0 to 4.0m in the south, reaching 5.0m in the south from
mid-period, with SW swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : SW to W 20 to 30 in the east at first, but variable 05 to 10 in
the extreme north-west, becoming NW 10 to 20 in the west towards
end of period.
VIS : Good in the west, otherwise moderate to poor in showers and
thundershowers with snow showers in the south-east until mid-
period, becoming moderate in rain in the south-west by end of
period.
SEA STATE: 5.0 to 7.0m reaching 8.0 to 9.0m in the east at first subsiding to
3.0 to 4.0m towards end of period, with SW swell.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
26/08/27 AT 0500UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- FORCE 10 STORM MOVING AWAY FROM KER.- FORCE 8 GALE RUNNING OVER CRO
AND KER.
PART 2: GENERAL SYNOPSIS, 26/08/27 AT 0000UTC
- COLD FRONT CF AXIS 32S/58E, 34S/65E, 40S/75E, 43S/80E, MOVING
EASTWARDS 15/20 KT, ASSOCIATED WITH A LOW-PRESSURE SYSTEM OF 947 HPA
WHICH IS FILLING AND IS FORECAST TO REACH 959 HPA NEAR 57S/100E BY
THE END OF THE FORECAST PERIOD.
PART 3: FORECAST FOR 24 HOURS FROM 26/08/27 AT 0600UTC TO 26/08/28 AT
0600UTC
WAM (30S/40S, 50E/65E)
RAIN AND FRONTAL SHOWERS WITH A COLD FRONT, FOLLOWED BY SCATTERED
SHOWERS.
WIND : SOUTH-WESTERLY, FORCE 5 TO 6, LOCALLY FORCE 7 BEHIND
THE COLD FRONT, EASING SOUTHERLY FORCE 4/5 OVER WESTERN AREA AS THE
SYSTEM MOVES OUT. GUSTS.
SEA : ROUGH TO VERY ROUGH, LOCALLY HIGH OVER SOUTHERN. LONG SOUTH-WESTERLY
SWELL, 4 TO 6 M.
VIS : POOR DURING RAINFALL.
AMS (30S/40S, 65E/80E)
RAIN AND FRONTAL SHOWERS WITH CF. SQUALLS.
WIND : NORTH-WESTERLY 5/6, LOCALLY 7 OVER SOUTHERN BACKING WESTERLY 6/7,
EASING SOUTH-WESTERLY 5/6 LATER. GUSTS.
SEA : ROUGH TO VERY ROUGH, LOCALLY HIGH OVER
SOUTHERN AREA. LONG SOUTH-WESTERLY SWELL 4 TO 6 M.
VIS : POOR DURING RAINFALL.
CRO (40S/50S, 50E/65E)
SCATTERED SHOWERS MORE FREQUENT OVER NORTHERN AREAS.
WIND : SOUTH-WESTERLY 6 TO 8, EASING TO 4 TO 6 LATER IN THE WESTERN AREAS.
GUSTS
SEA : VERY ROUGH TO HIGH. LONG SOUTH-WESTERLY SWELL 4 TO 6 M.
VIS : POOR DURING RAINFALL.
KER (40S/50S, 65E/80E)
RAIN AND FRONTAL SHOWERS, WITH SNOW OVER SOUTHERN AREA. VIOLENT GUSTS.
WIND : LOCALLY 7/8 ON THE BEAUFORT SCALE, LOCALLY 9/10, OVER
FAR SOUTH-EASTERN AT THE START OF THE FORECAST PERIOD. THEN WESTERLY
6 TO 8, EASING SOUTH-WESTERLY 5 TO 7 BY THE END OF THE FORECAST
PERIOD.
SEA : HIGH. LONG SWELLS FROM THE WEST, 4 TO 6 M.
VIS : VERY POOR DURING RAINFALL.