WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
19th 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 192200 TO 202200 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 to 40 in places in the central parts until mid-
period but W to SW 35 to 40 in the central parts from mid-
period.
2. CAPE EAST: N to NW 35 in the southern parts for the first-half
of the period, but W to SW 35 in the south-central parts
until mid-period.
3. DURBAN EAST: S to SW 35 in the west at first.
4. MARION FORTIES EAST: N to NW 35 over the central and eastern parts at
first, otherwise W to SW 35 to 40 in the central
and northern parts.
SYNOPTIC CHART 12:00Z
=====================
High 1028 hPa 31s04w, High 1023 hPa 34s43e, High 1026 hPa 27s68e.
Low 996 hPa 43s19w, Low 1001 hPa 45s22e
1. Cold front: 36s24w 38s22w 38s19w 40s18w into 43s19w
2. Cold front: 38s14e 39s18e 41s22e 44s22e into 45s22e
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 15 but variable 05 to 10 in the east until mid-
period becoming S to SW 05 to 10 towards the end of the period.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : E to SE 10 to 20 but N to NW 10 to 20 in the south-west, spreading
to the south-east from mid-period, reaching 25 to 30 in the
extreme south-west until mid-period. It will become S to SW 10 to
20 in the south-west from mid-period.
VIS : Good but moderate to poor in showers and rain in the south-
West, spreading to the south-central from mid-period.
SEA STATE: 3.0 to 4.0m in the south-west spreading to the south-central, with
W to NW swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 10 to 20, reaching 25 in places in the south-east.
VIS : Good.
SEA STATE: 3.0m in places in the south-east, with S to SW swell.
TRISTAN (30S/40S, 00E/20W):
WIND : N to NW 15 to 25, reaching 30 to 40 in places in the central
parts until mid-period but W to SW 15 to 25 in the south-west
spreading over the west and central parts towards mid-period,
reaching 30 to 40 in the central parts from mid-period.
VIS : Good, but moderate to poor in showers and rain in the west and
central parts spreading to the east towards the end of the period.
It will start to clear from the west towards mid-period.
SEA STATE: 3.0 to 4.0m except in the north-east, reaching 4.5 to 5.5m in the
West and central, with W to NW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : W to SW 10 to 20 in the south-east, reaching 25 in the extreme
south-east until mid-period, otherwise anticyclonic 05 to 15. It
will become E to SE 15 to 25 in the north-east by mid-period and
N to NW 10 to 20 in the west from mid-period, reaching 25 to 30 in
the south-west towards the end of the period.
VIS : Good.
SEA STATE: 3.0 to 3.5m except in the western and northern parts, reaching 4.0
to 5.0m in the south-east, but 5.5 to 6.5m in the extreme south-
east until at first, with S to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : N to NW 15 to 25 in the central and eastern parts until mid-
period, reaching 30 to 35 in the southern parts for the first-half
of the period, otherwise W to SW 15 to 25, reaching 30 to 35 in
the south-central until mid-period. It will become variable 05 to
10 in the north-west by the end of the period.
VIS : Moderate to poor in showers and thundershowers in the central,
spreading to the east by mid-period, otherwise good.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m in southern parts, with W to SW
swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : S to SW 15 to 25 in the west until mid-period where it will reach
30 to 35 at first becoming E to SE 10 to 20 towards the end of the
period, otherwise N to NW 10 to 20 but variable 05 to 10 in the
north-east.
VIS : Good.
SEA STATE: 3.0 to 3.5m except in the northern parts, SW swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 05 to 15.
VIS : Good.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20, but NE 05 to 15 in the south.
VIS : Good, but moderate in showers and rain in the north.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : N to NW 20 to 30 over the central and eastern parts until mid-
period, where it will reach 35 at first, otherwise W to SW 20 to
30, reaching 35 to 40 in the central and northern parts.
VIS : Moderate to poor in showers and rain in the west and central,
spreading to the east by mid-period. Possible snow showers in the
south. It will start to clear in the west towards the end of the
period.
SEA STATE: 4.0 to 5.0m, reaching 6.0 to 7.0m in places in the central and
south, with NW swell in the east but W to SW swell in the west.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
26/08/19 AT 0600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (Wind gusts may be about 40% stronger than the averages given here).
PART 1: WARNING
- Storm to Strong gale force 9 to 10 over CRO and KER.
PART 2: GENERAL SYNOPSIS, 26/08/19 AT 0000UTC
- Low 973 hPa near 48S/60E, expected 985 hPa near 47S/78E at end.
Associated cold front CF axis 36S/50E, 40S/60E, 42S/65E, 45S/67E,
48S/60E, moving rapidly eastwards.
- CG front arriving over west CRO by the end.
- High 1029 hPa near 27S/68E, moving slowly north-eastwards with a ridge over
WAM at the end.
PART 3: FORECAST FOR 24 HOURS FROM 26/08/19 at 0600UTC to 26/08/20 at 0600UTC
WAM (30S/40S, 50E/65E)
Rain and frontal showers. Gusts over southern.
WIND : North-westerly 4 to 6 ahead of the front, temporarily reaching 7 in
the south-east at start, backing south-westerly 5/6, locally 7 behind,
becoming anticlockwise 2/4 later, then increasing north-westerly 6/7
in the south-west at the end.
SEA : moderate to rough, locally very rough in south. South-westerly swell
3 to 5 m behind the front.
VIS : Poor in precipitation.
AMS (30S/40S, 65E/80E)
Rain and frontal showers. Gusts over southern.
WIND : North-westerly 4 to 7, from north to south ahead of the front, later
backing south-westerly 5/6, locally 7 behind from southwest, then
settling south 3/4 over the west at end.
SEA : moderate to very rough from north to south. South-westerly swell 3
to 5 m behind the front.
VIS : Poor in precipitation.
CRO (40S/50S, 50E/65E)
Rain and frontal showers. CF then CG. Snow in south. Violents gusts.
WIND : Northern half: westerly to south-westerly, 6/7, reaching 8 in the
south-east; decreasing temporarily 5/6 from the west, then increasing
north-westerly 6/7 later, locally 8 in the west.
Southern half: clockwise 7 to 8 in the eastern area at first,
reaching 9/10 in the north of the low, westerly to south-westerly 6/7
elsewhere, settling north-westerly 6/7, locally 8, later.
SEA : Very rough to high, very high near the low. Westerly swell 3 to 5m. VIS : Very poor in precipitation.
KER (40S/50S, 65E/80E)
Rain, frontal showers and squalls. CF. Snow in south. Violentes gusts.
WIND : Northern half: North-westerly 7/8 ahead of the front, backing to
westerly 6/7, locally 8 behind the front, increasing south-westerly
7/8 later, then decreasing 5/6 in the west at end.
Southern half: clockwise 7/8, reaching 9/10 in the north of the lows,
decreasing westerly 5/6 in the west at end, but easterly 2/4
prevailing in the far south-east at start.
SEA : Very rough to high, very high near the low. South-westerly swell of 4
to 8 meters, then later westerly swell of 4 to 8 meters.
VIS : Very poor in precipitation.