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WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII, EAST OF 20E ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE 29th OF JULY 2024 AT 17:15 UTC.
FOR SOUTH-EAST SECTOR OF METAREA. VII, PREPARED BY REUNION, SEE AREA 2 BELOW.
NOTE: WX OBSERVATIONS.
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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 292200 TO 302200 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:
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1. CAPE EAST: W to SW 35 to 40 in the south-west until mid-period,
spreading to the south-east by the end of the period.
2. MARION FORTIES EAST : N to NW 35 in the west from mid-period.
SYNOPTIC CHART 12:00Z
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High 1016 hPa 24s60e
Low 988 hPa 48s18e
Low 1004 hPa 37s46e
Cold Front: 33s03e 38s23e 43s26e 48s27e into 48s18e.
Cold Front: 25s42e 30s47e 35s48e into 37s46e cont. 42s47e 47s48e
AREA FORECAST:
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CAPE EAST (32.5S/40S, 20E/50E):
WIND : N to NW 15 to 25 over the central parts at first, spreading to
the east by mid-period, otherwise W to SW 15 to 25, reaching
35 to 40 in the south-west until mid-period, spreading to the
south-east by the end of the period.
VIS : Moderate in showers and rain in places.
SEA STATE: 3.0 to 4.0m, but 5.0 to 6.0m in places in the south-west,
spreading to the south-central parts, reaching 7.0 to 7.m in
the south-west, SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : Anti-cyclonic 05 to 10 in the north-west, otherwise W to SW 15
to 25, but N to NW 10 to 20 in the extreme east at first.
VIS : Moderate in showers and rain in places, but good in the north-
west.
SEA STATE: 3.0 to 4.0m in the west, reaching 5.0m in the south-west, SW
swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 05 to 15.
VIS : Good.
SEA STATE: 3.0m in the extreme south, SW swell.
MADAGASCAR EAST:
WIND : SE 10 to 20 in the north, otherwise N to NW 10 to 15, becoming
variable 05 to 10 in the extreme south.
VIS : Good, but moderate in showers and rain in places in the south.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : N to NW 15 to 25, reaching 35 in the west from mid-period, but
SW 10 to 20 in the north-east at first.
VIS : Moderate in showers and rain in places at times.
SEA STATE: 3.0 to 4.0m, but 5.0 to 6.0m in the north-west towards
mid-period, reaching 7.0 to 7.5m in places, W to NW swell.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK
(AMSTERDAM-CROZET-KERGUELEN)
DATE: 24/07/29 at 1700 UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (Wind gusts may be stronger than averages given here).
PART 1: WARNING:
– Gale continuing or expected over WAM and KER.
PART 2: GENERAL SYNOPSYS, 24/07/29 at 1200 UTC:
– Shallow low 1013 near 33S/68E, moving slowly eastwards and filling.
– Thundery cold front crossing WAM and CRO, with associated lox
deepening, expected 999 near 40S/56E the 30 at 12 UTC.
– New cold front at end just West of western areas.
– High 1019 near 39S/62E, slowly moving North-eastwards.
PART 3: FORECAST FOR 24 HOURS from 29/07/24 at 1800 UTC to 30/07/24 at
1800 UTC:
WAM (30S/40S, 50E/65E):
Frontal rains and showers, thundersqualls.
WIND: Anticlockwise 3 to 5, increasing North 6 or from West, then
rapidly veering West, becoming Clockwise 7 or 8 in far South later.
Severe gusts.
SEA : Moderate or rough, becoming rough or very rough soon. S swell 2 m
then long SW swell increasing 2 to 4 m from East to West.
VIS : poor under precipitation.
AMS (30S/40S,65E/80E):
Rains or showers.
WIND: Clockwise 3 to 5 but Southwest 6 or 7 in far Southeast, becoming
Anticlockwise 3 to 5 from West, increasing North 5 or 6, at ties 7,
at end from W
