WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
27TH OF DECEMBER 2025 AT 13:30 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 272200 TO 282200 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
=====================
HIGH 1018 HPA 32S07E, HIGH 1020 HPA 45S36E
LOW 996 HPA 46S07W, LOW 1003 HPA 49S15E, LOW 1004 HPA 24S49E
1. COLD FRONT: 27S26W 30S18W 35S12W 40S08W INTO 46S07W
2. COLD FRONT: 40S17E 45S24E INTO 49S15E
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E TO SE 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.
ST HELENA (15S/30S, 00E/20W):
WIND : SE TO E 05 TO 15 IN THE NORTH, OTHERWISE NW TO W 10 TO 20
REACHING 25 IN THE SOUTH, DRIFTING TO THE SOUTH-EAST
TOWARDS MID-
PERIOD, BUT SW TO S 10 TO 20 IN THE SOUTH-WEST.
VIS : GOOD BUT MODERATE IN SHOWERS AND RAIN IN THE SOUTH,
SPREADING TO
THE SOUTH-EAST TOWARDS MID-PERIOD.
TRADES (15S/30S, 00E/WEST COAST):
WIND : VARIABLE 05 TO 10 IN THE SOUTH-WEST, OTHERWISE S TO SE 05
TO 15
REACHING 20 IN THE SOUTH-EAST UNTIL MID-PERIOD.
VIS : GOOD.
TRISTAN (30S/40S, 00E/20W):
WIND : NW TO N 20 TO 30 IN THE EAST UNTIL MID-PERIOD, OTHERWISE S
TO SE
15 TO 25 BUT ANTICYCLONIC 05 TO 15 IN THE NORTH-WEST,
SPREADING
TO THE SOUTH-EAST TOWARDS THE END OF THE PERIOD.
VIS : GOOD BUT MODERATE TO POOR IN SHOWERS AND RAIN IN THE EAST.
SEA STATE: 3.0 TO 3.5M WITH W TO SW SWELL, BUT WITH NW SWELL IN THE
EAST
UNTIL MID-PERIOD.
CAPE WEST (30S/40S, 00E/20E):
WIND : ANTICYCLONIC 05 TO 15 IN THE CENTRAL PARTS, OTHERWISE S TO
SE 05
TO 15 REACHING 20 TO 30 IN THE EAST, BUT NW TO W 15 TO 25
IN THE
SOUTH-WEST.
VIS : GOOD, BUT MODERATE TO POOR IN SHOWERS AND RAIN IN THE
SOUTH-WEST.
SEA STATE: 3.0M IN THE EAST WITH S TO SE SWELL, REACHING 3.5M IN THE
SOUTH-
WEST WITH W TO NW SWELL.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : ANTICYCLONIC 05 TO 15 IN THE CENTRAL PARTS, OTHERWISE E TO
SE 10
TO 20 REACHING 25 IN THE EXTREME WEST BUT NE 10 TO 20 IN
THE
NORTH-WEST.
VIS : GOOD, BUT MODERATE IN SHOWERS AND RAIN IN THE SOUTH AND
EXTREME
NORTH-WEST.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : SE TO E 10 TO 20 BUT NE 10 TO 20 IN THE WEST.
VIS : GOOD, BUT MODERATE IN SHOWERS AND THUNDERSHOWERS IN THE
EASTERN
AND EXTREME WESTERN PARTS, SPREADING OVER THE CENTRAL
PARTS
TOWARDS THE END OF THE PERIOD.
MOZAMBIQUE CHANNEL:
WIND : N TO NW 10 TO 20 IN THE NORTH, OTHERWISE SE TO E 10 TO 20
REACHING 25 IN PLACES IN THE SOUTH-EAST.
VIS : GOOD, BUT MODERATE TO POOR IN SHOWERS AND THUNDERSHOWERS
IN THE
NORTHERN PARTS.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : N TO NW 10 TO 20, BECOMING S TO SE 10 TO 20 IN THE
SOUTH-WEST
TOWARDS MID-PERIOD.
VIS : MODERATE TO POOR IN SHOWERS AND THUNDERSHOWERS IN PLACES.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : SW 15 TO 25 IN THE EAST, OTHERWISE ANTICYCLONIC 05 TO 15
BUT N TO
NW 10 TO 20 IN THE WEST, SPREADING TO THE EAST BY THE END
OF THE
PERIOD.
VIS : GOOD, BECOMING MODERATE IN SHOWERS AND RAIN IN THE WEST
TOWARDS
MID-PERIOD.
SEA STATE: 3.0M IN THE EAST AT FIRST, WITH W TO SW SWELL.
AREA 2:
=======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA
ACK (AMSTERDAM-CROZET-KERGUELEN)
2025/12/27 AT 0600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE OVER EXTREME SOUTHEASTWARDS WAM AND NORTHEASTWARDS CRO,
EXCEPTED OVER
KER SOON.
PART 2: GENERAL SYNOPSIS, 2025/12/27 AT 0000UTC
- THUNDERY LOW 999 OVER SOUTHEASTWARDS WAM, CROSSING CRO AND KER,
EXPECTED
979 NEAR 56S/68E THE 28 AT 06 UTC. ASSOCIATED DISTURBANCE GRADUALLY
CROSSING AREAS.
- HIGH 1029 NEAR 35S/86E, SLOWLY MOVING EASTWARDS.
PART 3: FORECAST FOR 24 HOURS FROM 2025/12/27 AT 0600UTC TO
2025/12/28 AT
0600UTC
WAM (30S/40S, 50E/65E)
RAIN, SHOWERS AND THUNDERSQUALLS, MOVING EASTWARDS.
WIND: NORTHERLY 4 TO 6 EAST OF THE LOW INCREASING CLOCKWISE 7 TO 8 IN
THE
VICINITY OF LOW AND ASSOCIATED FRONT, THEN SETTING 4 TO 6 FROM
SOUTH-WESTWARDS. SEVERE GUSTS.
SEA : MODERATE OR ROUGH, BECOMING LOCALLY VERY ROUGH AND CROSSED IN
SOUTHWARDS LATER.
VIS : POOR OR VERY IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
RAIN, SHOWERS AND THUNDERSQUALLS OVER EXTREME SOUTHEASTERN AREA AT
END.
WIND: ANTICLOCKWISE 3 TO 5, GRADUALLY INCREASING NORTH 5 OR 6,
LOCALLY 7
OVER EXTREME SOUTHWESTERN AREA FROM WEST. GUSTS.
SEA : MODERATE BECOMING ROUGH OVER SOUTHWESTERN AREA.
VIS : POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
RAIN, SHOWERS AND THUNDERSQUALLS OVER NORTHEASTERN AREA.
WIND: CLOCKWISE 6 OR 8 OVER NORTHEASTERN WITH SEVERE GUSTS, BECOMING
SW 4 TO
6 WITH GUSTS.
SEA : MODERATE BECOMING ROUGH, VERY ROUGH AND CROSSED UNDER LOW.
VIS : POOR TO VERY POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
RAIN, SHOWERS OR THUNDERSQUALLS.
WIND: NW 5 OR 6, BECOMING CLOCKWISE 7 TO 8 FROM WESTERN WITH SEVERE
GUSTS
SOON.
SEA : MODERATE TO ROUGH BECOMING ROUGH TO VERY ROUGH.
VIS : POOR OR VERY POOR IN PRECIPITATION.
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