WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
13TH 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:
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FORECAST VALID FROM 132200 TO 142200 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: NW 35 to 40 in the west spreading to the east during the
second half of the period.
2. DURBAN EAST: SE to E 35 in places in the north-east.
SYNOPTIC CHART 12:00Z
=====================
High 1044 hPa 42s35e.
Low 962 hPa 62s03w.
Cold Front: 36s40w 37s34w 40s26w 44s20w 47s20w into 45s23w.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 05 to 15.
VIS : Good.
SEA STATE: 3.0m, with S to SE swell
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 05 to 15 but SW to W 05 to 10 in the east.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : Variable 05 to 10 but NW 15 to 25 in the south-west
drifting to the south towards mid-period, while becoming
SW 10 to 20 over the extreme south-west by the end of the
period.
VIS : Good, but moderate to poor in showers and rain in the south-
west from the second half of the period.
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 5.5m in the south-west, with S to
SE swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : SE 05 to 15 in the north-east otherwise variable 05 to 15 but
W to NW 10 to 15 in the south at first.
VIS : Good.
SEA STATE: 3.0 to 3.5m in the south and west, with SE swell.
TRISTAN (30S/40S, 00E/20W):
WIND : W to SW 15 in the east at first but NW 25 to 35 in the west
reaching 40 in places, spreading to the east during the second
half of the period, while becoming W to SW 25 to 35 in the
west towards the mid-period.
VIS : Good but moderate to poor in showers and thundershowers in
the west, spreading to the east during the second half of the
period.
SEA STATE: 4.0 to 5.0m, but 6.0 to 7.0m in the south-west, spreading to
the south and north-west towards the mid-period with W
to SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : N to NE 15 to 25 in the east at first, otherwise N to NW 15 to
25 reaching 30 over the extreme south-west by the end of the
period while becoming variable 05 to 10 in the north-east.
VIS : Good but moderate in rain and showers in the west at first and
in the extreme south-west by the end of the period.
SEA STATE: 3.0 to 4.0m, with W to SW.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : S to SE 15 to 25 but E to NE 15 to 25 in the west, reaching 30
in places. It will become W to NW 15 to 20 in the extreme west
towards the end of the period.
VIS : Good.
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 5.0m in the south-east but over
the south-west at first, with W to SW swell but NE swell in
the west.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : SE to E 15 to 25, reaching 30 to 35 in places in the north-
east, becoming NE 15 to 25 in the extreme south-west by the
end of the period.
VIS : Good but moderate to poor in showers and thundershowers in
places in the north-east.
SEA STATE: 3.5 to 4.0m, reaching 4.5 to 5.5m over the central-north with
S to SE swell.
MOZAMBIQUE CHANNEL:
WIND : SE 15 to 25 in the south but S to SW 15 to 25 in the north.
VIS : Good, but moderate in showers over the southern parts.
SEA STATE: 3.5m except in the extreme north with S to SE swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20 in the north but NE 10 to 15 in the south.
VIS : Good, but moderate in showers and thundershowers in the south.
SEA STATE: 3.0m in the south, with SE swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : Anticyclonic 05 to 15 in the north-west becoming 20 to 25
in the west towards the end of the period, otherwise W to SW
15 to 25.
VIS : Good.
SEA STATE: 4.0 to 5.0m in the north-west otherwise 5.0 to 6.0 reaching
7.0m over the extreme south-east at first with SW swell.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
26/08/13 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 WAM AND AMS.- GALE TO STRONG GALE OVER CRO AND KER.
PART 2: GENERAL SYNOPSIS, 26/08/13 AT 0000UTC
- LOW 952 NEAR 57S/79E, STEADILY MOVING EASTWARD. ASSOCIATED COLD FRONT (CF) OVER NORTHER KER MOVING TOWARDS SOUTH-EASTERN AMS.- COLD FRONT (CG) OVER NORTHERN AMS, STEADILY MOVING EASTWARD.- WEAKENING HIGH 1044 NEAR 42S/32E, SLOWLY MOVING EASTWARD.
PART 3: FORECAST FOR 24 HOURS FROM 26/08/13 AT 0600UTC TO 26/08/14 AT 0600UTC
WAM (30S/40S, 50E/65E)
SHOWERS OVER FAR NORTHERN.WIND: SOUTHERLY 5/6 AT TIMES 4, BUT SW 7/8 AT FIRST OVER FAR SOUTH-EASTERN. GUSTS.
SEA: ROUGH TO VERY ROUGH OVER NORTHERN, BUT VERY ROUGH TO HIGH OVER SOUTHERN BY SOUTH-WESTERLY SWELL INCREASING 4 TO 6M.
VIS: POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
FRONTAL RAIN AND SHOWERS WITH CF AND CG.WIND: NW 5/6 AHEAD OF CF, BUT SW 5 TO 7 BEHIND AT TIMES 8 OVER FAR SOUTHERN.
SEA: ROUGH TO HIGH FROM NORTH TO SOUTH BY LONG SOUTH-WESTERLY SWELL
INCREASING 4 TO 6M.
VISI:POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
SCATTERED SHOWERS.WIND: SW 6 TO 8 FROM NORTH-WEST TO SOUTH-EAST, INCREASING 8/9 OVER SOUTH-EASTERN AT END.SEVERE GUSTS.
SEA: VERY ROUGH TO VERY HIGH FROM NORTH-WEST TO SOUTH-EAST. LONG SOUTH-
WESTERLY SWELL 5 TO 7M.
VIS: MODERATE IN PRECIPITATION.
KER (40S/50S, 65E/80E)
FRONTAL RAIN AND SHOWERS WITH CG. SHOWERS BEHIND.WIND: SW 7/8 AT TIMES 9, BUT NW 7/8 OVER FAR NORTH-EASTERN AT FIRST.SEVERE GUSTS.
SEA: HIGH AT TIME VERY HIGH. LONG SOUTH-WESTERLY SWELL INCREASING 5 TO 7M.
VIS: POOR IN PRECIPITATION.=