WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
20TH OF DECEMBER 2025 AT 17:00 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 202200 TO 212200 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: S to SE 35 in the north-east during the second half of the
period.
2. CAPE EAST: NE 35 in the north-west during the second half of the period.
3. MARION FORTIES EAST: SW to W 35 in the south-east at first and in the
south-west towards mid-period.
SYNOPTIC CHART 12:00Z
=====================
High 1024 hPa 34s03w
Low 1016 hPa 37s12e, Low 964 hPa 54s50e.
1. Cold Front: 35s40e 40s50e 45s60e 50s70e into 54s50e.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 10 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 10 to 20, but NE 05 to 15 in the south-west.
VIS : Good.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 10 to 20, reaching 25 to 30 in the south-east.
VIS : Good.
SEA STATE: 3.0 to 3.5m in the south-east, with S to SE swell.
TRISTAN (30S/40S, 00E/20W):
WIND : Anticyclonic 05 to 15 in the north-east, otherwise N to NW 10 to
20, but S to SE 10 to 20, in the south, reaching 25 in the
central south and south-east.
VIS : Good, but moderate in showers and rain along the band in the
north-west through to the south-east.
CAPE WEST (30S/40S, 00E/20E):
WIND : NW 10 to 15 in the extreme south-west, otherwise S to SE 15 to 25
reaching 30 to 35 in the north-east during the second half of the
period.
VIS : Good.
SEA STATE: 3.0 to 3.5m in the east and south-east, with SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : SW 10 to 15 in the south-east and SE 10 to 20 in the east and
northern parts, otherwise NE 15 to 25 reaching 30 to 35 in the
north-west during the second half of the period.
VIS : Good, but moderate in showers and thundershowers in the north-
west.
SEA STATE: 3.0 to 4.0m reaching 4.5 to 5.5m in the east, with SW swell but
E to NE in the north-west.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : NW 10 to 20 in the south-east but NE 10 to 20 in the north-east
and south-west where it will reach 25 to 30 during the second
half of the period, elsewhere SE 10 to 20.
VIS : Good, but moderate to poor in showers and thundershowers in the
west and east.
SEA STATE: 3.0m to 3.5m, with S to SW swell.
MOZAMBIQUE CHANNEL:
WIND : N to NE 05 to 10 in the north, otherwise E to SE 10 to 20.
VIS : Good, but moderate in showers and thundershowers at times.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to NE 10 to 20.
VIS : Moderate in showers and thundershowers in places.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : SW to W 25 to 30, reaching 30 to 35 in the south-east at first
and in the south-west towards mid-period.
VIS : Moderate in rain and snow-showers, except in the north.
SEA STATE: 4.0 to 6.0m, reaching 7.0 to 8.0m in places in the east and
south-east during the first half of the period, with SW to W
swell.
AREA 2:
=======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA
ACK (AMSTERDAM-CROZET-KERGUELEN)
25/12/20 AT 1600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE OR LOCALLY SEVERE GALE CONTINUING OVER CRO AND KER.
PART 2: GENERAL SYNOPSIS, 25/12/20 AT 1200UTC
- SLOW-MOVING FRONT AXIS 31S/46E, 37S/59E, 41S/72E.
- LOW 960 NEAR 56S/54E, WITH ASSOCIATED COLD FRONT AXIS 40S/50E,
45S/60E, 53S/71E, RAPIDLY MOVING EASTWARD.
PART 3: FORECAST FOR 24 HOURS FROM 25/12/20 AT 1800UTC TO 25/12/21
AT 1800UTC
WAM (30S/40S, 50E/65E)
FRONTAL RAIN, SHOWERS AND SQUALLS, LOCALLY THUNDERY IN NORTHWEST.
WIND: NOTHWEST 4 OR 5, AT TIMES 6, BACKING SOUTHERLY IN SOUTHWEST,
GRADUALLY DECREASING 3 OR 4 SOON, AT TIMES 5. GUSTS.
SEA: MODERATE OR ROUGH, BECOMING VERY ROUGH OR HIGH IN SOUTHWEST IN
LONG SW SWELL.
VISI: POOR OR VERY POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
FRONTAL RAIN OR SHOWERS IN FAR SOUTHWEST.
WIND: ANTICLOCKWISE 3 OR 4, BUT NORTHWEST 5 OR 6 WITH GUSTS IN FAR
SOUTH.
SEA: MODERATE, BUT ROUGH IN FAR SOUTH.
VISI: POOR OR VERY POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
RAIN OR SHOWERS.
WIND: WEST OR NORTHWEST 7 OR 8, AT TIMES 9 AT FIRST, DECREASING 6 OR
7 AT END. SEVERE GUSTS.
SEA: VERY ROUGH OR HIGH, AT TIMES VERY HIGH IN SOUTH. LONG SW SWELL
GRADUALLY INCREASING 6 OR 7 M.
VISI: POOR OR VERY POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
RAIN OR SHOWERS.
WIND: NORTHWEST 6 OR 7, AT TIMES 8. SEVERE GUSTS.
SEA: ROUGH OR VERY ROUGH, BECOMING HIGH IN WES. LONG W SWELL 6 OR 7 M
IN WEST AT END.
VISI: POOR OR VERY POOR IN PRECIPITATION.=