WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
18th OF JULY 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:
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FORECAST VALID FROM 181000 TO 191000 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. CAPE WEST: S to SW 35 to 40 in places over the south-central and
south-eastern parts towards mid-period.
2. CAPE EAST: S to SW 35 to 40 in the east until the evening.
3. MARION FORTIES EAST: Cyclonic 35 to 45 in places in the north-east
until mid-period.
SYNOPTIC CHART 06:00Z
=====================
High 1030 hPa 33s24w, High 1021 hPa 25s01e, High 1021 hPa 46s31e
Low 1010 hPa 40s07e, Low 1004 hPa 36s28e, Low 1004 hPa 38s46e
1. Cold Front: 35s05e 37s08e 39s09e into 40s07e
2. Cold Front: 32s48e 35s51e 39s52e 40s47e into 38s46e
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 05 to 15.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SW 05 to 10 in the east, otherwise SE 05 to 10.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : S to SE 10 to 20 but variable 05 to 15 in the north-east.
VIS : Good but moderate in showers and thundershowers in the north-
west across the central to the south-eastern parts.
SEA STATE: 3.0m in the central and south, with S to SW swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : Variable 05 to 15 in the south-west, otherwise S to SE 05 to
15.
VIS : Good.
TRISTAN (30S/40S, 00E/20W):
WIND : Anti-cyclonic 10 to 15 in the north, otherwise S
to SE 05 to 15 but W to NW 15 to 20 in the south-west
spreading to the east towards mid-period, reaching 25 in the
south-west from mid-period.
VIS : Good becoming moderate in showers and thundershowers in the
south-west towards the end of the period.
SEA STATE: 3.0m in the south-west after mid-period, with S to SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : N to NW 10 to 20 in the central and east until mid-period,
where it will reach 25 until mid-period, otherwise S to SW 15
to 25, reaching 30 to 40 in places over the south-central and
south-eastern parts towards mid-period. It will become
anticyclonic 05 to 15 in the west towards the end of the
period.
VIS : Good but moderate in showers and rain the central and south-
east parts.
SEA STATE: 3.0 to 4.0m except over the north, reaching 4.5 to 5.5 in the
south-east after mid-period, with S to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : S to SW 15 to 25 in the east where it will reach 30 to 40
until the evening, otherwise cyclonic 15 to 25, reaching 30
over the north-west towards the end of the period but E to SE
10 to 20 over the central parts, reaching 25 over the south-
central parts.
VIS : Good but moderate to poor in showers and thundershowers in
places except the north.
SEA STATE: 3.0 to 4.0m reaching 4.5 to 5.5m in the central and eastern
parts but 6.0 to 8.0m over the extreme east until mid-period,
with W to SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : N to NW 05 to 15 over the north-west, otherwise W to SW 10 to
20 reaching 25 to 30 over some places in the central and
south-east.
VIS : Good becoming moderate to poor in showers and thundershowers
in the south-central towards the end of the period.
SEA STATE: 3.0 to 4.0m except in the north, reaching 4.5 to 5.5m in the
south and south-east, with S to SW swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 10 to 20 in the northern and eastern parts but
variable 05 to 10 in the south-west spreading to the south-
east towards mid-period. It will become N to NW 05 to 15 in
the south-west towards the end of the period.
VIS : Good.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : S to SE 05 to 15 but variable 05 to 10 in the south and south-
west.
VIS : Good.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : Cyclonic 20 to 30 in the north-east where it will reach 35 to
45 until mid-period, otherwise anti-cyclonic 10 to 20.
VIS : Moderate to poor in showers and thundershowers in the
north and north-east until mid-period, otherwise good.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 7.0m in the north and north-east,
with S to SE swell but SW swell in the south.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
26/07/18 AT 0500UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (Wind gusts may be about 40% stronger than the averages given here).
PART 1: WARNING
- Gale to severe gale continuing or expected over WAM, CRO and KER.
PART 2: GENERAL SYNOPSIS, 26/07/18 AT 0000UTC
- Deepening low 990 near 39S/44E steadily moving eastward, expected 998 near 39S/52E the 18 at 18 UTC.
- Cold front axis 36S/65E, 40S/74E, 44S/80 steadily moving eastward.
- High 1025 near 32S/86E steadily moving eastward.
- High 1028 near 46S/30E, very slowly moving east-northeastwards.
PART 3: FORECAST FOR 24 HOURS FROM 26/07/18 at 0600UTC to 26/07/19 at 0600UTC
WAM (30S/40S, 50E/65E)
Rain and showers.
WIND : Becoming Clockwise 7 or 8, at times 9, mainly Northwest. Severe
gusts.
SEA : Moderate or rough, becoming very rough or high over west in SW
swell 4 or 5 m.
VIS : Poor or very poor in precipitation.
AMS (30S/40S, 65E/80E)
Rain and showers.
WIND : Northern half: Northerly 2 to 4, increasing 3 to 5 later.
Southern half : Northwest 5 or 6 ahead of the front at times 7
with gusts, becoming Variable 2 to 4 behind, then Northerly 5 a 6
from west later.
SEA : moderate or rough.
VIS : poor in precipitation.
CRO (40S/50S, 50E/65E)
Rain and showers over north.
WIND : Northern half: becoming Clockwise 7 or 8, at times 9. Severe
gusts.
Southern half: Variable 2 to 4, but West 4 or 5 over far south at
times 6 with gusts, becoming Southeast 4 or 5 at end.
SEA : rough or very rough in SW swell 3 to 4 m abating, becoming soon
moderate or rough over south but very rough or high over north.
VIS : poor in precipitation.
KER (40S/50S, 65E/80E)
Rain and showers.
WIND : Northwest 6 or 7 ahead of the front, backing Westerly to Southwest
5 or 6 behind, becoming Variable 2 to 4 over northwest soon,
increasing Northeast 6 or 7, at times 8, over far northwest at
end.
SEA : rough or very rough. W swell 3 or 4 m.
VIS : poor in precipitation.