WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
21st OF AUGUST 2026 AT 17:30 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 212200 TO 222200 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 south-west.
2. CAPE EAST: W to SW 35 to 40 in the north-west from mid-period.
3. DURBAN EAST: SW 35 to 40 in the extreme south-west towards the end of
the period.
4. MARION FORTIES EAST: N to NW 35 in places in the south-west towards
mid-period.
SYNOPTIC CHART 12:00Z
=====================
High 1024 hPa 29s16w High 1024 hPa 26s01e High 1022 hPa 38s22e High 1024 hPa 32s36e High 1022 hPa 24s38e
Low 968 hPa 51s08e Low 970 hPa 52s50e Low 978 hPa 49s46e Low 1020 hPa 28s36e Low 1020 hPa 26s48e
1. Cold front: 28s06w 32s01e 37s07e 42s10e 47s12e into 51s08e
2. Cold front: 42s35e 47s52e into 52s50e
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 becoming SW 05 to 15 in the east from mid-period.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : N to NW 05 to 15 in the south-west, otherwise E to SE 10 to 20,
but variable 05 in the south-east.
VIS : Good becoming moderate in rain in the south-west towards end of
the period.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 15 to 25, reaching 30 in the extreme east towards end of
the period.
VIS : Good.
TRISTAN (30S/40S, 00E/20W):
WIND : Variable 05 to 10 in the north-east, otherwise N to NW 15 to 25,
reaching 30 to 35 in the south-west.
VIS : Good becoming moderate in showers and rain in the south-west from
mid-period.
SEA STATE: 3.0 to 4.0m in the south, reaching 4.5 to 5.0m in the extreme
south-west towards mid-period, with W to NW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : N to NW 15 to 25 in the south-east, reaching 30 in the extreme
south-east, otherwise W to SW 15 to 25. It will become NW 10 to 20
in the south-west from mid-period.
VIS : Good but moderate to poor in showers and thundershowers in the
south-east until mid-period.
SEA STATE: 3.0 to 4.0m in the south, with W to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : NW 20 to 30 in the south-west, spreading to the central parts
towards end of the period, otherwise W to SW 20 to 30. It will be
NE 10 to 20 in the north-west, reaching 25, becoming W to SW 15 to
25 from mid-period, reaching 30 to 40.
VIS : Moderate in showers and rain in the east, otherwise good. It
will become moderate to poor in showers and thundershowers in the
west by mid-period, spreading to the central parts towards end of
the period.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m in the south-east until 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 at first, otherwise
anticyclonic 05 to 15, but N to NE 15 to 25 in the west. It will
become SW 20 to 30 in the south-west towards the end of the
period, while reaching 35 to 40 in the extreme south-west.
VIS : Good but moderate in showers and thundershowers in the extreme
north-east at first.
SEA STATE: 3.0 to 4.0m in the south, spreading to the north-east from mid-
period, reaching 4.5 to 5.0m in the extreme south-west toward end
of the period, S to SW swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 10 to 20.
VIS : Good but moderate in showers in the extreme north-east at first.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20, but variable 05 to 10 in the south.
VIS : Good becoming moderate in showers and rain.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : S to SW 15 to 25, reaching 30 in the extreme east at first,
becoming N to NW 20 to 30 in the west towards mid-period while
reaching 35 in places in the south-west. It will become SW 20 to
30 in the extreme west at end of the period.
VIS : Moderate to poor in snow showers in the
south-east until mid-period, otherwise good. It will become
moderate to poor in showers and rain in the west towards the
end of the period.
SEA STATE: 5.0 to 6.0m, reaching 7.0 to 8.0m in places in the extreme east at
first, while subsiding to 4.0 to 5.0m from the west towards mid-
period, with W to SW swell, becoming NW swell in the west from
mid-period.
AREA 2:
=======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
26/08/21 AT 1800UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (Wind gusts may be about 40% stronger than the averages given here).
PART 1: WARNING
- Gale force 8 ongoing or expected over all areas.- Strong gale force 9 over CRO and KER- Storm force 10 over CRO.
PART 2: GENERAL SYNOPSIS, 26/08/21 AT 1200UTC
- Cold front (CF) axis 50S/74E, 37S/72E, 30S/53E, moving eastward at 2530 kt.- Low 970 hPa near 52S/50E associated with a cold front (CG) axis 53S/49E, 51S/53E, 44S/49E, and 42S/38E, moving eastward
PART 3: FORECAST FOR 24 HOURS FROM 26/08/21 at 1800UTC to 26/08/22 at 1800UTC
WAM (30S/40S, 50E/65E)
Rain and frontal showers, sometimes accompanied by thunderstorms.
WIND: W to SW, 5 to 7 from north to south, locally 8 over the far southern at
the beginning of the period, decreasing to SW 5 to 7 at the end of the
period.
SEA : rough to very rough, locally high over the southern area. SW swell 4 to
5 meters.
VIS : poor or very poor in precipitations.
AMS (30S/40S, 65E/80E)
Rain and frontal showers, sometimes accompanied by thunderstorms.
WIND: NW 5/6 ahead of CF, backing westerly 4/5 behind, then increasing NW 5
to 7, locally 8, ahead of CG. Westerly 6/7 at the end of the period
over western area. Strong gusts.
SEA : rough to very rough from north to south, locally high over the far
southern. SW swell 2 to 4 meters.
VIS : poor or very poor in precipitations.
CRO (40S/50S, 50E/65E)
Rain and frontal showers. Snow in the south.
WIND: westerly 7/8, locally 9, increasing SW 7 to 9, locally 10 over southern
area, then decreasing SW 5/6 at the end of the period over western
area. Strong gusts.
SEA : high, locally very high. SW swell 4 to 5 meters.
VIS : poor or very poor
in precipitations.
KER (40S/50S, 65E/80E)
Rain and frontal showers. Snow over southern.
WIND: at the beginning, SW 6 to 8, locally 9 ahead of CF over eastern and
westerly 5/6 elsewhere, increasing northerly 7 to 9 ahead of CG and
backing westerly 7/8 behind. Clockwise 4/5 over the far southern.
Strong gusts.
SEA : very rough, becoming high to very high. WSW swell 4 to 5 meters.
VIS : poor or very poor in precipitations.