WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
10TH OF DECEMBER 2025 AT 16:00 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 102200 TO 112200 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: SW 35 to 40 in the south-west towards the end of the period.
2. CAPE EAST: E to NE 35 to 40 in the north-west towards mid-period.
3. DURBAN EAST: NE 35 to 40 in the south-west towards mid-period, spreading
to the west towards the end of the period.
4. MARION FORTIES EAST: SW 35 to 45 in the eastern half until mid-period.
SYNOPTIC CHART 12:00Z
=====================
High 1021 hPa 26s06w, High 1024 hPa 37s26e
Low 970 hPa 53s05w, Low 971 hPa 53s44e
1. Cold Front : 29s16w 35s03w 40s02e 45s11e 50s16e into 53s05w
2. Cold Front : 31s43e 35s50e 40s56e 45s64e 50s78e into 53s44e
AREA FORECAST:
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ASCENSION (06S/15S, 00E/20W):
WIND : SE to E 05 to 15.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 05 to 15, but SW 05 to 10 in the east.
VIS : Good, but moderate in showers and thundershowers in the extreme
north-east towards mid-period.
ST HELENA (15S/30S, 00E/20W):
WIND : W to SW 05 to 15 in the south-east until mid-period, otherwise SE
to E 05 to 15, becoming N to NE 05 to 15 in the south-west
towards the end of the period.
VIS : Good, but moderate in showers and rain in places in the southern
parts.
TRADES (15S/30S, 00E/WEST COAST):
WIND : Variable 05 to 10 in the north-east and south-west, otherwise S
to SE 10 to 20 reaching 25 in the south-east at first. It will
become W to SW 05 to 15 in the south-west towards the end of the
period.
VIS : Good, but moderate in showers and thundershowers in places in the
eastern parts until mid-period.
TRISTAN (30S/40S, 00E/20W):
WIND : NW 15 to 25 in the extreme north-east at first, otherwise SW 15
to 25 reaching 30 in the south-east, but anticyclonic 05 to 15 in
the west.
VIS : Good, but moderate in showers and rain in the eastern parts.
SEA STATE: 3.0 to 4.0m reaching 4.5 to 5.5m in the south-east, with SW
swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : S to SE 10 to 20 in the north-east reaching 25 to 30 in the
extreme east at first, otherwise W to NW 05 to 15 reaching 20 to
30 in the south and west. It will become SW 10 to 20 in the east
towards mid-period, reaching 25 in the west and 30 to 40 in the
south-west towards the end of the period.
VIS : Good, but moderate in showers and rain in the west and south-
west, spreading to the central and south-eastern parts towards
the end of the period.
SEA STATE: 3.0 to 4.0m in the south-west, spreading to the southern and
western parts towards the end of the period, while reaching 5.0
to 6.0m in the south-west, with SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : Anticyclonic 05 to 15 in the central parts, otherwise S to SW 15
to 25 but E to NE 15 to 25 in the west, reaching 30 to 40 in the
north-west towards mid-period.
VIS : Good, but moderate in showers and rain in the east at first, but
in the south-west towards the end of the period.
SEA STATE: 3.0 to 4.0m reaching 5.0 to 6.0m in the south-east with SW swell,
becoming 4.0 to 5.0m in the north-west towards the end of the
period with E to NE swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : N to NW 05 to 15 in the east at first, otherwise SE 10 to 20
reaching 25 in the north. It will become NE 30 to 40 in the
south-west towards mid-period, spreading to the west towards the
end of the period.
VIS : Moderate to poor in showers and thundershowers in places,
becoming good from the south-west towards mid-period.
SEA STATE: 3.0 to 3.5m in the south and west, spreading to the north towards
the end of the period with SW swell, while becoming 3.5 to 4.5m
in the extreme south-west with E to NE swell.
MOZAMBIQUE CHANNEL:
WIND : Variable 05 to 10 in the north, otherwise S to SE 10 to 20
reaching 25 to 30 in the south-west, drifting to the south-east
towards the end of the period.
VIS : Moderate in showers and thundershowers in places.
SEA STATE: 3.0 to 3.5m in the south towards the end of the period, with S to
SE swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to NE 05 to 15, becoming SE 05 to 15 towards the end of the
period.
VIS : Moderate in showers and thundershowers in places.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : SW 20 to 30 reaching 35 to 45 in the eastern half until mid-
period. It will become NW 15 to 25 in the west towards mid-
period.
VIS : Good but moderate in showers and rain in east at first, but in
the south-west towards the end of the period.
SEA STATE: 5.0 to 6.0m reaching 7.0 to 9.0m in the east until towards the
end of the period, while subsiding to 3.0 to 4.0m in the west,
with SW swell.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
25/12/10 AT 1600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (Wind gusts may be about 40% stronger than the averages given here).
PART 1: WARNING
- Gale force 8 over CRO.
PART 2: GENERAL SYNOPSIS, 25/12/10 AT 1200UTC
- High 1020 near 31S/73E, slowly moving Eastward.
- Low 970 hPa 51S/44E with cold front CF associated and axis 34S/50E, 36S/52E, 40S/57E, 43S/60E moving Eastward 15/20kt.
PART 3: FORECAST FOR 24 HOURS FROM 25/12/10 at 1800UTC to 25/12/11 at 1800UTC
WAM (30S/40S, 50E/65E)
Frontal rain, showers and squalls. Showers and thundery squalls.
WIND: NW 4 to 6 ahead of the front backing South-Westerly 5/6 behind, locally 7 over far southern. Gusts.
SEA: Becoming rough to very rough locally high over far south-western. SW swell 4 to 5m.
VISI: poor or very poor in precipitation.
AMS (30S/40S, 65E/80E)
Scattered showers then showers and thundery squalls by western area.
WIND: Becoming NW 4 to 6 ahead CF. Gusts.
SEA: moderate to rough from north to south. SW swell 2 to 3m.
VISI: poor or very poor in precipitation.
CRO (40S/50S, 50E/65E)
Frontal rain and showers over north-eastern then scattered showers behind CF.
WIND: Becoming SW 6/7 locally 8 behind CF. Severe gusts.
SEA: rough to very rough. Westerly swell 4 to 5 meters.
VISI: poor or very poor in precipitation.
KER (40S/50S, 65E/80E)
Frontal rain and showers.
WIND: North-Westerly 5/6 increasing 6/7, but Westerly 4 to 6 behind. Gusts.
SEA: Moderate to rough, locally very rough. Westerly swell 3 to 4 m.
VISI: poor in precipitation.