WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
19th OF AUGUST 2026 AT 08:30 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 191000 TO 201000 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 west and central.
2. CAPE EAST: N to NW 35 in the southern parts in the first-half of the
period.
3. DURBAN EAST: S to SW 35 in the extreme south-west towards the end of the
Period.
4. MARION FORTIES EAST: N to NW 35 in the southern parts until mid-period,
otherwise W to SW 35 to 40 in the central and
northern parts from mid-period.
SYNOPTIC CHART 06:00Z
=====================
High 1028 hPa 30s07w, High 1025 hPa 33s35e, High 1030 hPa 26s68e.
Low 997 hPa 44s22w, Low 1003 hPa 43s14e
1. Cold front: 40s31w 39s26w 40s21w 42s19w into 44s22w
2. Cold front: 39s07e 38s09e 40s12e 41s14e into 43s14e
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 SW 05 to 10 in the east, becoming variable 05
to 10 in the east 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 reaching
25 to 30 in the extreme south-west from mid-period.
VIS : Good becoming moderate to poor in showers and rain in the south-
west from mid-period.
SEA STATE: 3.0 to 4.0m south-west from mid-period, with W to NW swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 10 to 20.
VIS : Good.
SEA STATE: 3.0m in places in the south-east, with S to SW swell.
TRISTAN (30S/40S, 00E/20W):
WIND : Anticyclonic 05 to 15 in the north-east until mid-period,
otherwise N to NW 15 to 25, reaching 30 to 40 in places in the
west and central. It will become W to SW 15 to 25 in the west
towards the end of the period.
VIS : Good, but moderate to poor in showers and rain in the west,
spreading to the central by mid-period.
SEA STATE: 3.0 to 4.0m except in the north-east, reaching 4.5 to 5.5m in the
west from mid-period, with W to NW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : W to SW 10 to 20 in the south-east reaching 25 to 30 in the
extreme south-east until mid-period, otherwise anticyclonic 05 to
15. It will become N to NW 10 to 20 in the south-west from mid-
period.
VIS : Good.
SEA STATE: 3.0 to 3.5m except in the northern parts, reaching 4.0 to 5.0m in
the south, but 5.5 to 6.5m in the extreme south-east until mid-
period, with S to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : Anticyclonic 05 to 15 in the north-east until mid-period,
otherwise N to NW 15 to 25, reaching 30 to 35 in the southern
parts in the first-half of the period, spreading to the central
and eastern parts by mid-period. It will become W to SW 15 to 25
in the west after mid-period, spreading to the central towards the
end of the period.
VIS : Good, but moderate to poor in showers and thundershowers in the
south-west spreading to the central and eastern parts from mid-
period. It will start to clear in the west towards mid-period.
SEA STATE: 3.0 to 4.0m except in the northern parts, reaching 5.0 to 6.0m in
south-west spreading to the central by mid-period and south-east
towards the end of the period, with W to SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : Anticyclonic 05 to 15 in the central until mid-period but N to NE
10 to 20 in the south-west spreading to the central by mid-period.
It will become S to SW 15 to 25 in the extreme south-west from
mid-period where it will reach 30 to 35 towards the end of the
period but W to NW 10 to 20 in the central-south and south-east
towards the end of the period.
VIS : Good.
SEA STATE: 3.0 to 4.0m in the south-west towards the end of the period, 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, spreading to the eastwards from mid-period,
reaching 35 in the southern parts until mid-period, otherwise W to
SW 20 to 30, reaching 35 to 40 in the central and northern parts
from mid-period.
VIS : Moderate to poor in showers and rain in the west, spreading to the
east by mid-period. Possible snow showers in the south.
SEA STATE: 4.0 to 5.0m, reaching 6.0 to 7.0m in the south, with NW swell in
the east but W to SW swell in the west.
AREA 2:
=======
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.