WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
11TH 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 112200 TO 122200 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. TRISTAN: N to NW 35 in the south-west by the end of the period.
2. CAPE WEST: S to SW 35 to 40 in the south at first, spreading to the
south-east from tomorrow morning.
3. CAPE EAST: N to NE 35 to 40 in the north-west at first, spreading to the
south by the end of the period, but W to NW 35 to 40 in the
extreme south-west from the morning until the afternoon.
4. DURBAN EAST: N to NE 35 to 40 in the west and south-west until in the
afternoon.
5. MARION FORTIES EAST: N to NW 35 in places in the south-west during
the afternoon.
SYNOPTIC CHART 12:00Z
=====================
High 1020 hPa 35s18w, High 1020 hPa 34s40e
Low 988 hPa 54s25e
1. Cold Front : 33s05e 40s14e 45s18e 50s23e into 54s25e
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.
ST HELENA (15S/30S, 00E/20W):
WIND : E to SE 05 to 15, reaching 20 in the south at times.
VIS : Good, but moderate in showers and rain in places in the southern
parts.
SEA STATE: 3.0m in the south and south-east, with SW swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 05 to 15, reaching 20 in the south by the end of the
period.
VIS : Good, but moderate in showers and thundershowers in places in the
eastern parts at first.
SEA STATE: 3.0m in the south-west, spreading to the south from mid-period,
with SW swell.
TRISTAN (30S/40S, 00E/20W):
WIND : S to SW 20 to 30 in the east and south-east at first, but anti-
cyclonic 05 to 15 in the north, otherwise N to NW 15 to 25,
reaching 30 to 35 in the south-west by the end of the period.
VIS : Good, but moderate in showers and rain in the south-east at first
as well as by the end of the period.
SEA STATE: 3.0 to 4.0m reaching 4.5 to 5.5m in the south-east at first, with
SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : S to SW 15 to 25, reaching 30 to 40 in the south at first,
spreading to the south-east from tomorrow morning.
VIS : Moderate in showers and rain in places, but good in the west and
north.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m in the west and south,
spreading to the east from mid-period, with SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : N to NE 15 to 25 in the central and northern parts, reaching 30
to 40 in the north-west at first, spreading to the south by the
end of the period, otherwise W to NW 20 to 30, reaching 35 to
40 in the extreme south-west from the morning until the
afternoon.
VIS : Good, but moderate in showers and rain in places in the west,
becoming poor in showers and thundershowers in the central, south
and north-west from tomorrow afternoon.
SEA STATE: 3.0 to 4.0m reaching 5.0 to 6.0m in the east at first, as well as
in the west from mid-period, with W to SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : N to NE 15 to 25 in the western half reaching 30 to 40 in the
west and south-west until in the afternoon, otherwise E to SE 15
to 25, reaching 30 in places in the east and northern parts.
VIS : Good but moderate in showers and thundershowers in the north-east
at first, as well as south-western parts by the end of the
period.
SEA STATE: 3.0 to 4.0m, reaching 4.5m in the south-east at first, as well as
south-west until in the afternoon, with S to SW swell, but NE in
the west.
MOZAMBIQUE CHANNEL:
WIND : Variable 05 to 10 in the north, but NE 05 to 15 in the south-
west, otherwise S to SE 10 to 20 reaching 25 to 30 in the south-
east.
VIS : Good but moderate in showers and thundershowers in north.
SEA STATE: 3.0 to 4.0m in the south, with S to SE swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : S to SE 05 to 15, reaching 25 to 30 in the south-west at times,
spreading to the south-east from tomorrow morning.
VIS : Moderate in showers and thundershowers in places.
SEA STATE: 3.0 to 4.0m in the south, with S to SE swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : N to NW 20 to 30 reaching 35 in places in the south-west during
the afternoon, but W to SW 15 to 20 in the eastern half at first.
VIS : Good, but moderate in showers and rain in the southern parts
until mid-period. It will become moderate to poor in showers and
thundershowers in the western half from mid-period spreading to
the central parts by the end of the period.
SEA STATE: 3.0 to 4.0m, but 4.5 to 5.5m in the eastern half at first, with
SW swell, becoming NW swell in the western half from mid-period.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA
ACK (AMSTERDAM-CROZET-KERGUELEN)
25/12/11 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, 25/12/11 AT 1200UTC
- COLD FRONT (CF) AXIS 49S/81E, 36S/66E, 28S/52E, MOVING EASTWARD AT
20/25 KT.
- LOW 987 HPA NEAR 49S/59E MOVING EASTWARD AT 15/20 KT.
- HIGH 1023 HPA NEAR 36S/38E MOVING EASTWARD AT 20/25 KT.
- COLD FRONT (CF) AXIS 54S/32E, 50S/34E, 47S/31E, MOVING EASTWARD AT
25/30 KT.
PART 3: FORECAST FOR 24 HOURS FROM 25/12/11 AT 1800UTC TO 25/12/12
AT 1800UTC
WAM (30S/40S, 50E/65E)
RAIN, SQUALLS, AND FRONTAL SHOWERS UNDER CF OVER FAR NORTH-EASTERN
AREA AT THE BEGINNING OF THE PERIOD. SCATTERED SHOWERS THEREAFTER.
WIND: SW 4 TO 6, BECOMING ANTICLOCKWISE 3/4 AT THE END OF THE PERIOD.
SEA: ROUGH TO VERY ROUGH LOCALLY HIGH. SW SWELL 3/4 M.
VISI: POOR IN PRECIPITATIONS.
AMS (30S/40S, 65E/80E)
RAIN, SQUALLS, AND FRONTAL SHOWERS UNDER CF.
WIND: NW 4 TO 6 AHEAD OF THE FRONT, BACKING SW 5/6.
SEA: MODERATE TO VERY ROUGH FROM NORTH-EAST TO SOUTH-WEST. LONG SW
SWELL 2/3 M, INCREASING TO 3 TO 5 M.
VISI: POOR TO VERY POOR IN PRECIPITATIONS.
CRO (40S/50S, 50E/65E)
SCATTERED SHOWERS, THEN FRONTAL SHOWERS UNDER CG AT THE END OF THE
PERIOD OVER SOUTHERN AREA.
WIND: W TO SW 6/7, SOON SETTLING UP WESTERLY 4/5.
SEA: VERY ROUGH TO HIGH, DECREASING. WESTERLY SWELL 3/4 M.
VISI: POOR IN PRECIPITATIONS.
KER (40S/50S, 65E/80E)
RAIN, SQUALLS, AND FRONTAL SHOWERS UNDER CF OVER THE WESTERN AREA AT
THE BEGINNING OF THE PERIOD. SCATTERED SHOWERS THEREAFTER.
WIND: VARIABLE AND LIGHT, SETTLING UP W TO SW 6/7, BUT CLOCKWISE 3/4
OVER THE SOUTH-EASTERN AREA AT THE END OF THE PERIOD.
SEA: ROUGH BECOMING VERY ROUGH OVER WESTERN AREA. WESTERLY SWELL 3/4
M.
VISI: POOR TO VERY POOR IN PRECIPITATIONS.