WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
25TH OF JANUARY 2025 AT 18:30 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 252200 TO 262200 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. DURBAN EAST: SE to E 35 in the central parts.
2. MARION FORTIES EAST: N to NW 35 in the south-west and south-central
from mid-period.
SYNOPTIC CHART 12:00Z
=====================
High 1018 hPa 27s01w
High 1020 hPa 45s35e
Low 997 hPa 43s12e
Low 1001 hPa 20s39e
1. Cold Front: 31s05w 34s00e 36s05e 39s10e into 43s12e
AREA FORECAST:
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ASCENSION (06S/15S, 00E/20W):
WIND : SE to S 05 to 15.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 05 to 10, but SW to W 05 to 15 in the east.
VIS : Good, but moderate in showers and thundershowers in the north-
east at times.
ST HELENA (15S/30S, 00E/20W):
WIND : E to SE 10 to 20.
VIS : Good, but moderate in showers and rain in the south.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 10 to 20, reaching 25 to 30 in the south-east towards
mid-period.
VIS : Good, but moderate in the north-east at times.
TRISTAN (30S/40S, 00E/20W):
WIND : Anti-cyclonic 05 to 10 in the south-west moving to the south-
east by the end of the period, otherwise SE to E 10 to 20, but
NW to N 10 to 20 in the south-west from mid-period.
VIS : Good, but moderate in showers and rain in the north.
CAPE WEST (30S/40S, 00E/20E):
WIND : W to NW 15 to 25 in the south-east, otherwise SW to S 10 to 20
becoming SE 10 to 15 in the west towards mid-period spreading
to the east by the end of the period, while reaching 25 in the
north-east from mid-period.
VIS : Good, but moderate in showers and rain in the west clearing in
the south-west from mid-period.
SEA STATE: 3.0 to 3.5m in the south-east, with SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : NE to E 10 to 20 in the north, otherwise NW to N 10 to 20,
becoming SW to S 10 to 20 in the south-west towards mid-
period.
VIS : Good, but moderate to poor in showers and rain in the east
spreading to the south-west towards the end of the period.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : SE to E 20 to 30 reaching 35 in the central parts, but NE 05
to 15 in the south-west and NE 15 to 25 in the north-east.
VIS : Good in the south-west spreading to the north-west from mid-
period, otherwise moderate to poor in showers and rain.
SEA STATE: 3.0 to 4.0m, except in the south-west, reaching 4.5m in the
east towards mid-period, with E to SE swell.
MOZAMBIQUE CHANNEL:
WIND : E to SE 15 to 25 in the south, otherwise N to NW 15 to 25, but
cyclonic 15 to 25 in the central parts moving to the south-
east by the end of the period.
VIS : Moderate to poor in showers and thundershowers.
SEA STATE: 3.0 to 3.5m in the south, with SE swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : SE to E 05 to 15 in the extreme north until mid-period,
becoming NW to W 05 to 10, otherwise NE to N 10 to 20.
VIS : Good in the north, otherwise moderate in showers and
thundershowers.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : Anti-cyclonic 05 to 15 moving to the south-east by mid-period,
becoming N to NW 20 to 30 in the western and central parts
towards mid-period spreading to the east from mid-period,
while reaching 35 in the south-west and south-central. It will
become SW 20 to 30 in the west towards the end of the period.
VIS : Good, but moderate in showers and rain in the north-east and
southern half.
SEA STATE: 3.0 to 4.0m in the south-east until mid-period, with NW swell.
3.0 to 4.0m in the south-west from mid-period spreading to the
south-east in the second half of the period, with NW to W
swell.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
25/01/25 AT 1630UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
GALE FORCE 8 EXPECTED OVER KER.
PART 2: GENERAL SYNOPSIS, 25/01/25 AT 1200UTC
- HIGH 1030 HPA NEAR 39S/71E, MOVING SLOWLY EASTWARD.
- COLD FRONT CF OVER SOUTHWESTERN CRO, MOVING EASTWARD 15/20 KT, OVER
CRO AND KER AT END.
PART 3: FORECAST FOR 24 HOURS FROM 25/01/25 AT 1800UTC TO 25/01/26
AT 1800UTC
WAM (30S/40S, 50E/65E)
SCATTERED SHOWERS.
WIND : ANTICLOCKWISE 3 TO 5 INCREASING E 6 OVER NORTHWESTERN.
SEA : MODERATE TO ROUGH. SLIGHT E SWELL 2 M OVER NORTHERN.
VISI : GOOD.
AMS (30S/40S, 65E/80E)
SHOWERS AND SQUALLS OVER NORTH-EASTERN.
WIND : ANTICLOCKWISE 3 TO 5 OVER SOUTHERN, EASTERLY 5 TO 6 OVER
NORTHERN DECREASING 4 TO 5 AT END. GUSTS ON SQUALLS.
SEA : MODERATE TO ROUGH. SW SWELL 2 TO 3 M DECREASING.
VISI : GOOD BUT POOR IN PRECIPITATIONS OVER NORTH-EASTERN.
CRO (40S/50S, 50E/65E)
RAIN AND FRONTAL SHOWERS UNDER CF.
WIND : NORTHWEST 4 TO 5 INCREASING 7 WITH GUSTS AHEAD CF, BACKING
SOUTHWEST 6 BEHIND THEN BECOMING ANTICLOCKWISE 3 TO 5 LATER. SETTING
UP N 6 OVER SOUTHWESTERN AT END.
SEA : MODERATE TO ROUGH. WESTERLY SWELL 3 TO 4 M OVER SOUTHERN.
VISI : POOR UNDER PRECIPITATION.
KER (40S/50S, 65E/80E)
FRONTAL RAIN AND SHOWERS LATER WITH CF.
WIND : WESTERLY 5 TO 7 FROM NORTH TO SOUTH AREA, INCREASING LOCALLY 8
IN VICINITY OF CF.
SEA : MODERATE TO ROUGH. SW SWELL 2 TO 3 M.
VISI : GOOD BECOMING POOR UNDER CF