WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
29TH OF DECEMBER 2025 AT 16:30 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:
====================
NIL.
SYNOPTIC CHART 12:00Z
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High 1018 hPa 27s04e, High 1022 hPa 39s28e, High 1028 hPa 43s55e
Low 1010 hPa 40s05e, Low 964 hPa 63s13e
1. Cold front: 47s35e 55s38e 60s33e 63s25e 65s20e into 63s13e
AREA FORECAST:
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ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 05 to 15, but NE 05 to 10 in the south-west.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 05 to 15, but SW 05 to 10 in the east.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : E to SE 05 to 15 in the north, otherwise NW to W 10 to 20
reaching 25 in the south-west until mid-period.
VIS : Good, but moderate in showers and rain in the south-west.
TRADES (15S/30S, 00E/WEST COAST):
WIND : Anticyclonic 05 to 10 in the south-west, otherwise S to SE 10 to
20.
VIS : Good.
TRISTAN (30S/40S, 00E/20W):
WIND : NW to W 15 to 25 reaching 30 over the western half in the first
half of the period.
VIS : Good, but moderate in showers and rain in the west spreading to
the east from mid-period.
SEA STATE: 3.0 to 4.0m in the south-west reaching 4.5 to 5.5m towards the
end of the period, with NW swell becoming SW from mid-period.
CAPE WEST (30S/40S, 00E/20E):
WIND : SE to E 10 to 20 in the east, otherwise variable 05 to 10, but NW
to W 15 to 25 in the central south. It will become N to NW 10 to
20 in the west towards mid-period.
VIS : Good, but moderate to poor in showers and rain in the south-west
from mid-period.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : NE to E 10 to 20 in the west reaching 25 to 30 in the north-west,
otherwise anticyclonic 05 to 15, but N to NE 05 to 15 in the
extreme south-east, while E to SE 10 to 20 in the north-east.
VIS : Good, but moderate in showers and rain in the east until mid-
period.
SEA STATE: 3.0m in the north-west towards the end of the period, with NE
swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : SE to S 15 to 25, but NE 15 to 25 in the south-west spreading to
the north-west by the end of the period while reaching 30 in the
south-west.
VIS : Good, but moderate in showers and thundershowers in the east.
MOZAMBIQUE CHANNEL:
WIND : S to SW 05 to 10 in the north, otherwise S to SE 15 to 25.
VIS : Good, but moderate to poor in showers and thundershowers in the
north.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : N to NW 05 to 15, but S to SW 10 to 20 in the south-west
spreading over the southern half towards the end of the period.
VIS : Good in the north, otherwise moderate to poor in showers and
thundershowers in places.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : N to NW 15 to 25 in the extreme east, otherwise SW to W 05 to 15
spreading to the south-east towards mid-period, becoming
anticyclonic 05 to 10 in the north-west in the second half of the
period.
VIS : Good.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
25/12/29 AT 1600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- NIL.
PART 2: GENERAL SYNOPSIS, 25/12/29 AT 1200UTC
- HIGH PRESSURE SYSTEM 1028 HPA AROUND 42S/57E, SLOWLY MOVING
EASTWARDS.
- COLD FRONT AXIS 34S/69E, 37S/75E, 40S/80E, MOVING SLOWLY EASTWARDS.
- LOW PRESSURE SYSTEM 1008 HPA FILLING AROUND 34S/67E.
PART 3: FORECAST FOR 24 HOURS FROM 25/12/29 AT 1800UTC TO 25/12/30
AT 1800UTC
WAM (30S/40S, 50E/65E)
SHOWERS AND SQUALLS OVER THE NORTH-EASTERN AREA WITH A NEW
LOW-PRESSURE SYSTEM.
WIND : SOUTH-EASTERLY 5 TO 6, BECOMING CLOCKWISE 4 TO 6 OVER FAR
NORTH-EASTERN AREA DURING THE DAY WITH STRONG GUSTS.
SEA : MODERATE TO ROUGH, WITH A SOUTH-EASTERLY SWELL OF 2 TO 3 METRES
ARRIVING AT THE END OF THE FORECAST PERIOD.
VISI: POOR TO VERY POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
SHOWERS AND THUNDERSTORMS WITH CF.
WIND : CLOCKWISE 5 TO 6, SOMETIMES 7,INCREASING SOUTH-EAST 5 TO 7
OVER THE SOUTHERN BUT SETTING NORTH 4 TO 6 OVER THE NORTHERN AHEAD OF CF. STRONG GUSTS.
SEA : MODERATE TO ROUGH, CROSSED SEA OVER WESTERN AREA.
VISI: POOR TO VERY POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
RARE SHOWERS OVER FAR SOUTHERN.
WIND: ANTICLOCKWISE 3 TO 4, INCREASING WEST 5 TO 7 OVER SOUTHERN
AREAS WITH GUSTS.
SEA : MODERATE TO ROUGH OVER FAR SOUTH-EASTERN.
VISI: BONNE.
KER (40S/50S, 65E/80E)
SHOWERS AND THUNDERSTORMS OVER FAR NORTH-EASTERN.
WIND : ANTICLOCKWISE 3 TO 4, INCREASING WEST 5 TO 7 OVER SOUTHERN
AREA.
SEA : MODERATE TO ROUGH LOCALLY VERY ROUGH FAR SOUTH-EASTERN.
VISI: POOR TO VERY POOR IN PRECIPITATION.=