WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
11TH 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 112200 TO 122200 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: W to NW 35 to 40 in places in the southern parts for the
first half of the period.
2. CAPE WEST: E to NE 35 at times in the east and south-east.
3. DURBAN EAST: SE to E 35 in places in the north-west for the first half
of the period.
4. MARION FORTIES EAST: W to SW 35 in places in the west and over the
southern parts.
SYNOPTIC CHART 12:00Z
=====================
High 1042 hPa 40s27e.
Low 986 hPa 41s18w.
Cold Front: 24s28w 27s21w 33s16w into 41s18w
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 05 to 15.
VIS : Good.
SEA STATE: 3.0 in the south-east until mid-period, 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.
SEA STATE: 3.0 in the south for the first half of the period, with S to
SE swell.
ST HELENA (15S/30S, 00E/20W):
WIND : NE 10 to 20 in the south-east until mid-period, otherwise
variable 05 to 10 but N to NW 15 to 25 in the south and west,
spreading to the south-east from mid-period. It will W to SW
15 to 25 in the south-west.
VIS : Good, but moderate to poor in showers and thundershowers the
south-west, west and south.
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 : Variable 05 to 15 but E to SE 15 to 25 in the southern parts
for the first half of the period.
VIS : Good.
SEA STATE: 3.0 to 3.5m in the south and west, with SE swell.
TRISTAN (30S/40S, 00E/20W):
WIND : N to NE 15 to 25 in the eastern parts, otherwise W to NW 15 to
25 reaching 30 to 40 in places in the southern parts for the
first half of the period becoming SW 20 to 30 over the western
parts towards the end of the period.
VIS : Good but moderate to poor in showers and thundershowers in
places.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m in the western and southern
parts, with W to SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : E to NE 15 to 25, reaching 30 to 35 at times in the east and
south-east, but N to NW 15 to 25 in the western parts from
mid-period.
VIS : Good.
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 5.0 in the south-east and south-
west, with E to SE swell.
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
to 35 in the north-west and west at times.
VIS : Good but moderate in showers and rain in the northern and
eastern parts at times.
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 5.0m in the west from the second
half of the period with W to SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : Variable 05 to 10 in the north-east, otherwise SE to E 15 to
25, reaching 30 to 35 in places in the north-west for the
first half of the period.
VIS : Good but moderate to poor in showers and thundershowers in
places.
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 5.5m over the central and western
parts, with S to SE swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 05 to 15, reaching 20 to 30 in places in the south.
VIS : Good, becoming moderate to poor in showers and thundershowers
over the southern parts.
SEA STATE: 3.0 to 4.0m in the southern parts reaching 4.5 to 5.0m from
mid-period, with S to SE swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20, but variable 05 to 15 in the south.
VIS : Good, but moderate in showers and thundershowers in places.
SEA STATE: 3.0m in the eastern and northern parts but in the southern
parts from mid-period, with E to SE swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to SW 15 to 25 reaching 30 to 35 in places in the west and
over the southern parts.
VIS : Moderate in showers and rain in places in the northern parts.
SEA STATE: 3.0 to 4.0m reaching 4.0 to 6.0m in the southern parts, with W
to SW swell.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
26/08/11 AT 1700UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (Wind gusts may be about 40% stronger than the averages given here).
PART 1: WARNING
- Gale to strong gale over CRO and KER
PART 2: GENERAL SYNOPSIS, 26/08/11 AT 1200UTC
High 1037 hPa near 33S/94E with a ridge to the west, moving slowly eastward.High 1045 hPa near 39S/23E with a ridge to the east, moving slowly eastward.Between these two cells, cold front (CF) axis 29S/50E, 40S/65E, 46S/80E, moving east-north-eastward.A cold front (CG) transit over southern CRO and southern KER with a deepening low, expected 948 hPa near 57E/72S at end.
PART 3: FORECAST FOR 24 HOURS FROM 26/08/11 at 1800UTC to 26/08/12 at 1800UTC
WAM (30S/40S, 50E/65E)
Rain, frontal showers. Squalls. CF
WIND : Northwest 4 to 6 ahead of the front, backing to South to
Southeast 4 to 6 behind the front, settling Southwest 5/6 in
the far south at end.
SEA : Rough, but moderate in the northeast. Southwest swell 2 to 3
meters behind the front.
VIS : Poor to very poor during precipitation.
AMS (30S/40S, 65E/80E)
Scattered showers, then rain and frontal showers.
WIND : North to North-West 3/4 in the north and 5/6 locally 7 in the
south, backing by southwest behind the front, Southerly to
Southwest 4/5, locally 6.
SEA : Moderate to Rough, locally very rough in the far south.
Southwest swell 2 to 3 meters behind the front.
VIS : Poor in precipitation.
CRO (40S/50S, 50E/65E)
Showers, rain/snow, and showers in the far south. CG.
WIND : Southerlyto Southwest 5/6, increasing soon Westerly 7/8 over
the south, then during the day increasing Westerly 8/9 over
the southeast half and 6/7 over the northwest half. Violent
gusts.
SEA : Rough to very rough from north to south, becoming high in the
southeast half. Southwest swell 3 to 5 meters.
VIS : Poor to very poor in precipitation.
KER (40S/50S, 65E/80E)
Rain and frontal showers. Loc snow in the south. CF then CG
WIND : Southerly to southwest 5/6, increasing soon Westerly to
Northwest 7/8 by south area, reaching 9 locally in the south
later But Northwest 6/7 in the northeast at firstahead of the
front CF. Violent gusts.
SEA : Rough to very rough, becoming very rough to high from north to
south. Southwesterly Swell3 to 5 meters.
VIS : Poor to very poor in precipitation.