WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
10TH OF AUGUST 2026 AT 17:00 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 102200 TO 112200 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. TRADES: S to SE 35 in the central and south-eastern parts at first.
2. TRISTAN: W to NW 35 to 40 in the places in the west and central parts.
3. DURBAN EAST: S to SE 35 in places in the central and north-west.
4. MARION FORTIES EAST: S to SW 35 in places in the south-west at first.
SYNOPTIC CHART 12:00Z
=====================
High 1043 hPa 40s15e, High 1046 hPa 38s83e.
Low 943 hPa 49s21w, Low 982 hPa 58s46e.
1. Cold Front: 27s34w 32s25w 40s14w 48s09w 56s11w into 49s21w
2. Cold Front: 32s33e 36s39e 47s50e 51s48e 59s51e into 58s46e
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 15 to 25.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 05 to 15 but SW 05 to 15 in the east.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : NE 10 to 20 in the south-east, otherwise E to SE 15 to 25 but
N to NW 15 to 25 in the south-west, reaching 30 at first,
spreading to the south-central parts from mid-period. It will
become W to SW 15 to 25 in the extreme south-west towards the
end of the period.
VIS : Good, becoming moderate to poor in the south-west towards mid-
period.
SEA STATE: 3.0 to 4.0m except in the northern parts, reaching 4.5 to 5.5m
in the south-west from mid-period, with E to SE swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 15 to 25 reaching 30 to 35 in the central and south-
eastern parts at first.
VIS : Good
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 5.5m in the east, south and
central parts until mid-period, with SE swell.
TRISTAN (30S/40S, 00E/20W):
WIND : E to NE 15 to 25 in the north-east until mid-period, otherwise
W to NW 15 to 25 reaching 30 to 40 in the places in the west
and central parts.
VIS : Good but moderate to poor in showers and thundershowers in the
west across the central to the south, spreading to the central
towards mid-period, while clearing in the south-west.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 7.0m in the west and central
parts, with W to NW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : E to SE 15 to 25 in the east and northern parts reaching 30 at
times and 30 to 35 in the east from mid-period, otherwise
anti-cyclonic 05 to 15 but NE 10 to 20 in the west.
VIS : Good.
SEA STATE: 3.0 to 4.0m except in the west and central parts, reaching 4.5
to 5.0 , with E to SE swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : E to SE 15 to 25 but anticyclonic 05 to 15 in the south-west
spreading to the south-central towards mid-period. it will
become NE 15 to 25 in the west towards the end of the period.
VIS : Good but moderate in showers and rain in the north-west until
mid-period and central parts, otherwise good.
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 5.0m in the places western and
central parts until mid-period, with W to SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : S to SE 15 to 25, reaching 30 to 35 in places in the central-
north-west but N to NE 10 to 20 in the north-east.
VIS : Good but moderate to poor in showers and thundershowers in the
west and central parts.
SEA STATE: 3.0 to 4.0m in the west spreading to the central from mid-
period, reaching 4.5 to 5.5m in the west, with S to SW swell.
MOZAMBIQUE CHANNEL:
WIND : N to NE 10 to 20 in the north-west, otherwise E to SE 10 to 20
towards the end of the period.
VIS : Good, becoming moderate to poor in showers and thundershowers
over the south-west.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 15 to 25, but NE 15 to 25 in the south.
VIS : Moderate in showers and rain in in places.
SEA STATE: 3.0m in the eastern parts, with E to SE swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : S to SW 15 to 25 reaching 30 to 35 in places in the south-west
at first.
VIS : Moderate in showers and rain in places in the south, with
possible snow-showers in the south.
SEA STATE: 3.5 to 4.5m reaching 5.0 to 6.0m in the south and western
Parts until mid-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)
26/08/10 AT 1700UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- STRONG GALE FORCE 9 OVER KER.
PART 2: GENERAL SYNOPSIS, 26/08/10 AT 1200UTC
- COLD FRONT WITH THUNDERY SQUALLS AXIS 37S/46E, 40S/50E, 45S/60E,
49S/65E, 50S/67E, 51S/70E MOVING EASTWARD 10/15 KT.
- HIGH 1041 HPA NEAR 39S/81E, MOVING EASTWARD 10/15 KT.
PART 3: FORECAST FOR 24 HOURS FROM 26/08/10 AT 1800UTC TO 26/08/11
AT 1800UTC
WAM (30S/40S, 50E/65E)
FRONTAL RAIN, SHOWERS AND SQUALLS UNDER CF BY WESTERN AREA.
WIND : ANTICLOCKWISE 3 TO 5 INCREASING N 5 TO 6 AHEAD CF BACKING S 4
TO 5 BEHIND CF BY SOUTH-WESTERN AREA.
SEA : MODERATE TO ROUGH. SW SWELL 2 TO 3 METERS OVER SOUTH-WESTERN
AREA.
VISIBILITY : POOR OR VERY POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
SCATTERED SHOWERS FOLLOWED BY FRONTAL RAIN OVER FAR SOUTHWESTERN AT
THE END OF THE FORECAST PERIOD.
WIND : ANTICLOCKWISE WINDS 3 TO 5, FRESHENING NORTHERLY 5 TO 6 BY
WESTERN PART OF THE REGION, THEN NW 6/7 AHEAD OF THE COLD FRONT AT
THE END OF THE PERIOD.
SEA : MODERATE TO ROUGH. SOUTHWEST SWELL 2 M OVER FAR SOUTHERN AND
EAST SWELL 2.5 OVER FAR NORTHERN.
VISIBILITY: GOOD, BUT POOR DURING SHOWERS.
CRO (40S/50S, 50E/65E)
FRONTAL RAIN, SHOWERS AND SQUALLS UNDER CF.
WIND : NW 5 TO 6 AT TIMES 7 AHEAD CF AND BACKING GRADUALLY SW 4 TO 6
BEHIND. GUSTS. THEN BECOMING ANTICLOCKWISE 4 TO 6 BY WESTERN AREA AT
END.
SEA : ROUGH TO VERY ROUGH. SW SWELL BETWEEN 2 TO 4 METERS.
VISI : POOR OR VERY POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
FRONTAL RAIN AND SHOWERS UNDER CF.
WIND : NW 5 TO 6 INCREASING NW 8/9 AHEAD CF THEN BACKING SW 5 TO 6
BEHIND. GUSTS.
SEA : ROUGH TO VERY ROUGH. WESTERLY SWELL 3 TO 5 METERS.
VISIBILITY : POOR TO VERY POOR UNDER PRECIPITATION.=