WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
21st 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 211000 TO 221000 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 extreme south-west from mid-period.
2. MARION FORTIES EAST: W to NW 35 to 40 in the extreme north at first,
otherwise S to SW 35 to 40, reaching 45 in the south-east until mid-period, when it will moderate from the west.
SYNOPTIC CHART 06:00Z
=====================
High 1024 hPa 33s12e High 1026 hPa 32s36e High 1024 hPa 25s39e High 1026 hPa 24s71e
Low 972 hPa 49s03e Low 972 hPa 51s46e Low 1022 hPa 27s35e Low 1022 hPa 26s47e
1. Cold front: 26s17w 31s02w 36s02e 41s05e 46s07e into 49s03e
2. Cold front: 44s35e 48s46e into 51s46e
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 10 to 20.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 10 to 20 but variable 05 to 10 in the east where it will
become SW 05 to 15 by mid-period.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : E to SE 10 to 20 in the north and south-west, otherwise NW 05
to 15. It will become N to NW 05 to 15 in the south-west by mid-
period.
VIS : Good but moderate in showers and rain in the south-east until mid-
period.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 15 to 25 but N to NW 05 to 15 in the extreme south-west.
VIS : Good.
TRISTAN (30S/40S, 00E/20W):
WIND : N to NW 20 to 30 in the extreme north-east at first, otherwise W
to SW 15 to 25. It will be N to NW 15 to 25 in the west, spreading
to the east by end of the period, reaching 30 to 35 in the extreme
south-west from mid-period.
VIS : Good but moderate in showers and rain in the extreme north-east
at first.
SEA STATE: 3.0 to 4.0m except in the extreme north-west, reaching 4.5 to 5.0m
in the extreme south-west towards end of the period, with W to NW
swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : S to SE 10 to 20 in the north-east until mid-period, otherwise N
to NW 15 to 25, reaching 30 in the south. It will be W to SW 15 to
25 in the west, spreading east from mid-period.
VIS : Good but moderate to poor in showers and thundershowers in the
central, spreading east from mid-period, when it will clear from
the west.
SEA STATE: 3.0 to 4.0m in the south, reaching 4.5m in the extreme south, with
W to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : W to SW 20 to 30, but E to NE 10 to 20 in the north-west, reaching
25 from mid-period. It will become NW 20 to 30 in the south-west
from mid-period.
VIS : Moderate in showers and rain in the south-east, otherwise good. It
will become moderate to poor in showers and thundershowers in the
extreme south-west towards end of the period.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 5.5m in the south-east, but 6.0 to
6.5m in the extreme south-east from mid-period, with W to SW
swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : NW 05 to 15 in the extreme north-east until mid-period, otherwise
variable 05 to 10, but NE 10 to 20 in the west, reaching 25 in the
extreme west from mid-period. It will become S to SW 10 to 20 in
the east from mid-period.
VIS : Good but moderate in showers and thundershowers in the north-east.
SEA STATE: 3.0 to 4.0m in the south, spreading to the north-east towards end
of the period, S to SW swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 10 to 20.
VIS : Good becoming moderate in showers in the north-east from mid-period.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20, but N to NE 05 to 15 in the south.
VIS : Good becoming moderate in showers and rain from mid-period.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to NW 30 to 40 in the extreme north at first, otherwise S to
SW 30 to 40, reaching 45 in the south-east until mid-period,
moderating to 15 to 25 from the west by mid-period. It will
become N to NW 20 to 30 in the west towards end of the period.
VIS : Moderate to poor in showers and rain with snow showers in the
south, becoming good from the west by mid-period. It will become
moderate in showers and rain in the extreme south-west towards the
end of the period.
SEA STATE: 5.0 to 6.0m, reaching 7.0 to 8.0m in places in the east, while
subsiding to 3.5 to 4.5m from the west towards end of the period,
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)
26/08/21 AT 0600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40% STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE TO LOCALLY STORM CONTINUING OR EXPECTED IN ALL AREAS.
PART 2: GENERAL SYNOPSIS, 26/08/21 AT 0000UTC
- COLD FRONT AXIS 32S/50E, 34S/59E, 40S/64E, 45S/66E, 53S/65E, RAPIDLY MOVING EASTWARDS.- NEW COLD FRONT EXPECTED VERY SOON OVER CRO, DUE TO A LOW EXPECTED 969 NEAR 52S/52E THE 21 AT 12 UC, MOVING EASTWARDS AND DEEPENING. EXPECTED 964 NEAR 50S/63E THE 22 AT 06 UTC.
PART 3: FORECAST FOR 24 HOURS FROM 26/08/21 AT 0600UTC TO 26/08/22 AT 0600UTC
WAM (30S/40S, 50E/65E)
FRONTAL RAIN OR SHOWERS, AT TIMES THUNDERY.
WIND: SOUTHWEST 5 OR 6, BUT NORTHWEST AT FIRST IN FAR NORTHEAST, INCREASING
SOON WESTERLY 7 OR 8 IN SOUTH WITH SEVERE GUSTS AND BECOMING LOCALLY
VARIABLE 2 TO 4 IN NORTH.
SEA : ROUGH OR VERY ROUGH, CROSSED, BECOMING SOON LOCALLY HIGH IN SOUTH. SW
SWELL 4 OR 5 M IN SOUTH.
VIS : POOR OR VERY POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
FRONTAL RAIN OR SHOWERS, AT TIMES THUNDERY.
WIND: NORTHWEST 7 OR 8, BACKING RAPIDLY SOUTHWEST BEHIND THE FRONT WHILE
DECREASING 5 OR 6, INCREASING NORTHWEST 7 OR 8 AT END FROM WEST. SEVERE
GUSTS.
SEA : ROUGH TO VERY ROUGH, CROSSED. SW SWELL 4 OR 5 M IN EAST AT FIRST, THEN
IN FAR SOUTHWEST SOON.
VIS : POOR OR VERY POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
FRONTAL RAIN OR SHOWERS. SNOW IN SOUTH.
WIND: WEST OR SOUTHWEST 5 OR 6, RAPIDLY INCREASING NORTHWEST 7 OR 8, BACKING
SOON SOUTHWEST 8 OR 9, AT TIMES 10 IN SOUTH, DECREASING 6 OR 7 FROM
WEST AT END. SEVERE GUSTS.
SEA : VERY ROUGH OR HIGH, CROSSED, BECOMING LOCALLY VERY HIGH IN EAST AT END.
SW SWELL 4 OR 5 M.
VIS : POOR OR VERY POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
FRONTAL RAIN OR SHOWERS. SNOW IN SOUTH.
WIND: NORTH 7 OR 8, AT TIMES 9, BACKING SOUTHWEST BEHIND THE FRONT,
DECREASING SOON OR LATER TEMPORARILY 5 OR 6, INCREASING NORTHWEST 8 OR
9 AT END FROM WEST. SEVERE GUSTS.
SEA : VERY ROUGH OR HIGH, CROSSED. WSW SWELL INCREASING 4 OR 5 M.
VIS : POOR OR VERY POOR IN PRECIPITATION.