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WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII EAST OF 20E.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE 15TH OF DECEMBER 2024 AT 17:00 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 152200 TO 162200 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:
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1. CAPE EAST: N to NW 35 to 40 in the south-east, but W to SW 35 in
the south-west.
2. DURBAN EAST: NE 35 in the north.
3. MARION FORTIES EAST: W to NW 35 to 40, moderating from the north by
mid-period.
SYNOPTIC CHART 12:00Z
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High 1030 hPa 35s14w, High 1022 hPa 34s50e
Low 951 hPa 50s24e
1. Cold Front: 29s11e 35s20e 40s26e into 50s24e
AREA FORECAST:
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CAPE EAST (32.5S/40S, 20E/50E):
WIND : N to NW 20 to 30 in the eastern half, reaching 35 to 40 in the
south-east, otherwise W to SW 15 to 25 reaching 30 to 35 in
the south-west, but NE 15 to 25 in the north-east at first.
VIS : Moderate to poor in showers and thundershowers in the central
and western half, spreading to the east towards mid-period.
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 5.5m in the west, spreading to
the south and central parts by mid-period, with SW to S swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : SE to E 15 to 25 in the east, otherwise NE 15 to 25 reaching
30 to 35 in the north, but S to SW 15 to 25 in the west, where
it will become SE to E 15 to 25 towards mid-period.
VIS : Moderate in showers and thundershowers in places, except in
the north.
SEA STATE: 3.0 to 3.5m, with SW swell.
MOZAMBIQUE CHANNEL:
WIND : SE to E 15 to 25 in the south-east, otherwise N to NE 15 to
25, but W to SW 05 to 15 in the east.
VIS : Good, but moderate to poor in showers and thundershowers in
places in the northern half.
SEA STATE: 3.0 to 3.5m in the north-west at first, with NE swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 15 to 25 in the north, otherwise N to NE 10 to 20,
reaching 25 to 30 in the extreme south-west.
VIS : Moderate to poor in showers and thundershowers at times.
SEA STATE: 3.0 to 3.5m in the extreme south-west, with S to SW swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to NW 30 to 40, moderating to 15 to 25 from the north by
mid-period.
VIS : Good, but moderate to poor in showers and rain in the west,
spreading to the east towards mid-period, while clearing from
the west.
SEA STATE: 3.5 to 4.5m, but 5.0 to 7.0m in the west, spreading to east
towards mid-period, while reaching 8.0 to 10.0m in the south-
west, drifting to the south-east by end of period, with W to
SW swell.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
24/12/15 AT 1600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40% STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
– STRONG GALE FORCE 9 OVER KER.
– GALE FORCE 8 OVER CRO.
PART 2: GENERAL SYNOPSIS, 24/12/15 AT 1200UTC
– DEEPENING LOW 961 HPA NEAR 48S/78E, MOVING RAPIDLY SOUTH-EASTWARD WITH ASSOCIATED COLD FRONT CF AXIS 30S/60E, 35S/74E, 40S/80E.
– BUILDING HIGH 1022 HPA NEAR 34S/47E, MOVING EASTWARD.
– NEW COLD FRONT CG ON DAYTIME OVER CRO.
PART 3: FORECAST FOR 24 HOURS FROM 24/12/15 AT 1800UTC TO 24/12/16 AT 1800UTC
WAM (30S/40S, 50E/65E)
RARE SHOWERS.
WIND: ANTICLOCKWISE 3 TO 5 INCREASING SW 6 OVER SOUTHEASTERN AT FIRST, INCREASING NW 6/7 OVER SOUTHWESTERN LATER.
SEA: ROUGH. LONG SW SWELL 3 TO 4 M DECREASING 2 TO 3 M OVER WESTERN LATER.
VISI: GOOD.
AMS (30S/40S, 65E/80E)
FRONTAL RAINS AND SHOWERS AT FIRST.
WIND: NW 6/7 AHEAD CF, BACKING SW 6/7 BEHIND AND BECOMING ANTICLOCKWISE 3 TO 5 OVER NORTHWESTERN AT END.
SEA: ROUGH TO VERY ROUGH. LONG SW SWELL 3 TO 4 M, 4 TO 5 M OVER SOUTHERN LATER.
VISI : POOR TO VERY POOR UNDER PRECIPITATION.
CRO (40S/50S, 50E/65E)
FRONTAL SHOWERS AND RAINS.
WIND: WESTERLY 6/7 VEERING NW 8 AHEAD CG, BACKING WESTERLY BEHIND 6 TO 8 FROM NORTH TO SOUTH AREA. GUSTS.
SEA : ROUGH TO VERY ROUGH. LONG WESTERLY SWELL 3 TO 4 M.
VISI: VERY POOR UNDER PRECIPITATION.
KER (40S/50S, 65E/80E)
SHOWERS, MORE FREQUENTLY OVER SOUTHWESTERN AT END.
WIND: WESTERLY 6 TO 9 FROM NORTHWEST TO SOUTHEAST AREA DECREASING 5 TO 8 LATER THEN 6/7 AT END. GUSTS.
SEA: VERY ROUGH TO HIGH THEN ROUGH TO VERY ROUGH. WESTERLY SWELL 3 TO
4 M, INCREASING 4 TO 5 M LATER OVER NORTHERN.
VISI: VERY POOR UNDER PRECIPITATION.
ENDS THIS IS CAPE TOWN RADIO
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