WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
17th OF AUGUST 2026 AT 13:30 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:
=======
FORECAST VALID FROM 172200 TO 182200 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. MARION FORTIES EAST: W to NW 35 to 40 in the extreme south-west for the
first half of the period.
SYNOPTIC CHART 12:00Z
=====================
High 1032 hPa 34s56s.
Low 1018 hPa 22s40e Low 1018 hPa 24s08w
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : SE 10 to 20.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 10 to 15 but SW 05 to 10 in the east.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : Variable 05 to 10 in the north-east and extreme east, otherwise SE
15 to 25.
VIS : Good in the north-east, otherwise moderate in showers and
thundershowers.
SEA STATE: 3.0m in the south-west, with S swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 10 to 20 reaching 25 in the east.
VIS : Good, but moderate in showers in the extreme south-west.
SEA STATE: 3.0m in places, with SW swell.
TRISTAN (30S/40S, 00E/20W):
WIND : Variable 05 to 10 in the north, otherwise W 15 to 25 reaching 30
in the extreme south.
VIS : Good, but moderate in showers in the south and extreme north-east.
SEA STATE: 3.0 to 4.0m in the south, with W to SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : SE 15 to 25 in the north-east, otherwise variable 05 but W to NW
15 to 25 in the south reaching 30 in the extreme south-west from
mid-period.
VIS : Good in the north-east, otherwise moderate in rain and showers.
SEA STATE: 3.0m reaching 4.0 to 5.0m in the south but 5.5 to 6.0m in the
south-east for the first half of the period, with W to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : NW 15 to 25 reaching 30 in the south-east but W to SW 15 to 25 in
the west reaching 30 in the south-west at first.
VIS : Good, but moderate in rain and showers in the south.
SEA STATE: 3.0 to 4.0m in the south and west reaching 5.0 to 5.5m in south-
west, with SW swell in the south-west, otherwise NW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : E to NE 10 to 20, becoming S to SW 10 to 20 in the extreme south-
west from mid-period.
VIS : Good but moderate in showers and thundershowers in the north-east.
MOZAMBIQUE CHANNEL:
WIND : S 05 to 15.
VIS : Moderate in showers in places.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20, but NE 10 to 15 in the south.
VIS : Moderate in showers in places.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : Variable over the central and south-eastern parts at first,
otherwise W to NW 20 to 30 reaching 35 to 40 in the extreme south-
west for the first half of the period.
VIS : Moderate to poor in showers and possible snow showers in the
south.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m in the south-west from mid-
period, with W swell.
AREA 2:
=======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
26/08/17 AT 0400UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40% STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE FORCE 8 OVER CRO AND KER.
PART 2: GENERAL SYNOPSIS, 26/08/17 AT 0000UTC
- HIGH 1032 HPA NEAR 35S/54E SLOWLY MOVING NORTH-EASTWARD.- LOW 975 HPA NEAR 60S/43E WITH COLD FRONT CF ASSOCIATED AND AXIS 40S/28E, 46S/35E, 51S/38E, 58S/42E MOVING EASTWARD 15/20KT.
PART 3: FORECAST FOR 24 HOURS FROM 26/08/17 AT 0600UTC TO 26/08/18 AT 0600UTC
WAM (30S/40S, 50E/65E)
SCATTERED SHOWERS.
WIND: ANTICLOCKWISE 3 TO 4 AT TIMES 5, BUT NW 5 TO
6 OVER SOUTH-WESTERN AREA.
SEA: MODERATE TO ROUGH BUT LOCALLY VERY ROUGH OVER SOUTH-EASTERN AREA. SW SWELL 3 TO 4 METERS
VIS: GOOD.
AMS (30S/40S, 65E/80E)
SHOWERS.
WIND: SW 5 TO 6 OVER SOUTHERN AREA BUT SW 4 TO 5 OVER NORTHERN AREA.
SEA: ROUGH TO VERY ROUGH LOCALLY HIGH OVER SOUTH-EASTERN AREA. SW SWELL 4 TO 6 METERS.
VIS: POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
FRONTAL RAIN AND SHOWERS UNDER CF.
WIND: W TO NW 6 TO 7 AT TIMES 8 WITH GUSTS AHEAD CF BECOMING VARIABLE 3 TO 4 BEHIND.
SEA: ROUGH TO VERY ROUGH BECOMING MODERATE TO ROUGH. SW SWELL 3 TO 5 METERS ABATING.
VIS: VERY POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
SHOWERS THEN FRONTAL RAIN AND SHOWERS UNDER CF.
WIND: SW 7 TO 8 DECREASING WESTERLY 6 TO 7 THEN NW 7 TO 8 AHEAD DE CF. SEVERE
GUSTS.
SEA: VERY ROUGH TO HIGH BECOMING GRADUALLY ROUGH TO VERY ROUGH BY WESTERN AREA. LONG SW SWELL 5 TO 7 METERS ABATING 4 TO 5 METERS BY WESTERN AREA
VIS: POOR OR VERY POOR IN PRECIPITATION.