WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
31st 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 311000 TO 011000 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 WEST : W to NW 35 in places in the south-central and south-east
until mid-period.
2. CAPE EAST : W to NW 35 in places in the south from mid-period.
3. MARION FORTIES EAST : W to NW 35 to 40 in the western parts towards
the end of the period. It will become S to SW 35
to 40 in the extreme south-west by the end of
the period.
SYNOPTIC CHART 06:00Z
=====================
High 1030 hPa 30s03w, High 1039 hPa 31s67e.
Low 984 hPa 47s03e, Low 976 hPa 56s21e, Low 1017 hPa 39s48e.
1. Cold front: 33s19e 38s12w 44s01w into 47s03e.
2. Cold front: 43s31e 50s34e 55s31e into 56s21e.
3. Cold front: 31s36e 33s41e 36s46e into 39s48e.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : SE to E 15 to 20.
VIS : Good.
SEA STATE: 3.0 to 3.5m in the south and central parts until mid-period,
with SE swell.
ANGOLA (06S/15S, 00E/00N):
WIND : SE 10 to 20, but S to SW 05 to 15 in the extreme east.
VIS : Good.
SEA STATE: 3.0m in the south until mid-period, with S to SE swell.
ST HELENA (15S/30S, 00E/20W):
WIND : Anticyclonic 05 to 15 in the south-east, otherwise E to SE 15
to 25, but N to NE 05 to 15 in the south-west.
VIS : Good.
SEA STATE: 3.0 to 3.5m in the north until mid-period, with S to SE swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 15 to 25 reaching 30 in places in the south-east until
mid-period.
VIS : Good.
SEA STATE: 3.0 to 3.5m except in the south-west, with S to SE swell.
TRISTAN (30S/40S, 00E/20W):
WIND : Anticyclonic 05 to 15 in the north-east but N to NW 15 to 25
in the north across the central to the south-east until mid-
period, otherwise W to SW 10 to 20 spreading over the south
from mid-period. It will become variable 05 to 10 in the
south-west towards the end of the period.
VIS : Good but moderate in showers and rain in the west across the
central to the south-east.
SEA STATE: 3.0 to 4.0m except in the north reaching 4.5 to 5.0m in the
south-east until mid-period, with NW to W swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : Anticyclonic 05 to 15 in the northern parts but S to SE 15 to
25 in the north-east, otherwise W to NW 15 to 25 reaching 30
to 35 in places in the south-central and south-east until mid-
period. It will become SW 10 to 20 in the south-west towards
mid-period.
VIS : Good, becoming moderate in showers and rain in the south-west
toward mid-period, spreading to the central and south-eastern
parts towards the end of the period.
SEA STATE: 3.0 to 4.0m except in the northern parts reaching 4.5 to 5.0m
in places in the south, with W to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : Variable 05 to 10 in the north-western parts until mid-period,
otherwise W to NW 15 to 25 reaching 30 to 35 in places in the
south from mid-period.
VIS : Good but moderate to poor in showers and thundershowers
in places in the eastern parts at first and in the south-west
towards the end of the period.
SEA STATE: 3.0 to 4.0m except in the northern parts, reaching 4.5 to 5.5m
in the south-west and south-central parts from mid-period,
with W to SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : Variable 05 to 10 in the western parts at first but SE 10 to
15 in the south-west at first, otherwise E to NE 15 to 25.
VIS : Good but moderate to poor in showers and thundershowers in
places in the south-central until mid-period and in the south-
east from mid-period.
MOZAMBIQUE CHANNEL:
WIND : Variable 05 to 10, becoming S to SE 10 to 20 in the eastern parts
but E to NE 05 to 15 in the western parts from mid-period.
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 in places, otherwise good.
SEA STATE: 3.0 to 4.0m except in the south, with E to SE swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to NW 15 to 25 reaching 30 to 40 in the western parts
towards the end of the period. It will become S to SW 30 to 40
in the extreme south-west by the end of the period.
VIS : Moderate in showers and rain in the west spreading to the
central from mid-period and to the east towards the end of the
period, otherwise good. It will start to clear in the west by
the end of the period.
SEA STATE: 3.0 to 4.0m reaching 4.5 to 5.5m in the west from mid-period
but 6.0 to 9.0m in the extreme west by the end of the period,
with W to NW swell.
AREA 2:
=======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
26/08/31 AT 0500UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (Wind gusts may be about 40% stronger than the averages given here).
PART 1: WARNING
- Gale continuing over KER.
PART 2: GENERAL SYNOPSIS, 26/08/31 AT 0000UTC
- Waving front axis NW/SE between 40S/50E and 50S/70E, slowly moving eastward. - High 1037 near 32S/67E, slowly moving eastward.
PART 3: FORECAST FOR 24 HOURS FROM 26/08/31 at 0600UTC to 26/09/01 at 0600UTC
WAM (30S/40S, 50E/65E)
Frontal rain, showers and squalls over far southwestern.
WIND : NW 5 or 6, at times 7 with gusts but anticlockwise 3 or 4 over
northeastern at first, backing SW 5 or 6 over southwestern behind
the front at end.
SEA : moderate or rough, locally very rough and crossed over far \
southern.
VIS : poor or very poor in precipitation.
AMS (30S/40S, 65E/80E)
Few showers.
WIND : Anticlockwise 3 or 4, but W 5 or 6 with gusts over far southern.
SEA : moderate or rough in SW swell, locally very rough and crossed over
far southern.
VIS : mainly good, but moderate in precipitation.
CRO (40S/50S, 50E/65E)
Frontal rain and showers over northern, scattered showers over southern.
WIND : Over northern : NW 6 or 7 north of front, SE 3 or 4 south of
front, backing SW 4 to 6 behind the front later. Gusts.
Over southern : SW 4 or 5, at times 6 or 7 over far southeastern
at first, decreasing E 3 or 4 soon, then increasing NW 5 or 6 over
western at end. Gusts.
SEA : rough or very rough at times high over far southeastern. NW swell
4 or 5 m spreading gradually from southwest, then SW swell 4 or 5
m later over southern.
VISI : poor or very poor in precipitation.
KER (40S/50S, 65E/80E)
Frontal rain and showers.
WIND : Over northern : NW 6 or 7. Severe gusts.
Over southern : W or SW 6 or 7, locally 8 over eastern, decreasing
3 or 4 from west later. Severe gusts.
SEA : very rough or high. W or SW swell 4 or 5 m over southern.
VIS : poor or very poor in precipitation.