WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
08TH OF MAY 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:
=======
FORECAST VALID FROM 082200 TO 092200 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: W to SW 35 in the central and eastern parts during the first
half of the period, but until the second half of the period
in the far eastern parts.
2. CAPE WEST: W to NW 35 in the west, spreading to the central and
eastern parts during the second half of the period.
3. CAPE EAST: NW 30 to 35 over the western parts towards end of the
period.
4. MARION FORTIES EAST: W to SW 35 to 40 in the southern half, but
only over the south-eastern parts toward the end
of the period.
SYNOPTIC CHART 12:00Z
=====================
High 1030 hPa 32s24w, High 1018 hPa 45s14e, High 1025 hPa 30s71e.
Low 1004 hPa 44s07w, Low 1004 hPa 48s08w, Low 1008 hPa 41s07e,
Low 954 hPa 60s43e, Low 971 hPa 52s69e.
1. Cold Front: 34s11w 40s05w into 44s07w.
2. Cold front: 29s02e 35s13e 40s16e into 41s07e.
3. Cold front: 33s38e 37s53e 42s70e into 52s69e.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : SE 15 to 20.
VIS : Good.
SEA STATE: 3.0m in places in the north-west at first, with SE swell.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 10 to 20 but SW to W 05 to 10 in the east.
VIS : Good, but moderate in showers and thundershowers in the
extreme north-east at times.
ST HELENA (15S/30S, 00E/20W):
WIND : SW to S 10 to 15 in the extreme south and south-east,
otherwise, E to SE 10 to 20.
VIS : Good, but moderate in showers and thundershowers in the
west at times.
SEA STATE: 3.0m in the southern parts, with SW swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SW 05 to 15 in the south-west where it will reach
20 towards mid-period, otherwise S to SE 10 to 20.
VIS : Good but very poor in fog in the extreme south-east at times.
SEA STATE: 3.0m in the extreme south-west towards the end of the period,
with SW swell.
TRISTAN (30S/40S, 00E/20W):
WIND : Variable 05 in the extreme north-west, otherwise W to SW 15 to
25 reaching 30 to 35 in the central and eastern parts during
the first half of the period, but until second half of the
period in the far eastern parts. It will become NW 10 to 20 in
the extreme south-west towards mid-period, reaching 25 to 30
towards end of the period.
VIS : Good, but moderate in showers and rain over the south-eastern
parts, and over the extreme south-west towards the end of the
period.
SEA STATE: 3.0 to 4.0m but 4.5 to 6.0m in the central and eastern parts,
but only in the eastern parts towards the end of the period,
with SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : SE to S 05 to 15 in the north-east, but E to NE 10 to 20 in
the extreme south-east at first, otherwise W to NW 15 to 25
reaching 30 to 35 in the west, spreading to the central and
eastern parts during the second half of the period.
VIS : Moderate in showers and rain but poor in showers and
thundershowers over the extreme western parts, spreading to
the central and eastern parts during the second half of the
period.
SEA STATE: 3.0 to 3.5m, except in the north and north-east, reaching 4.0
to 6.0m in the west, spreading to the central and eastern
parts during the second half of the period, with SW to W
swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : Anticyclonic 05 to 10 over the central parts and NW to W 20 to
30 in the extreme west and north-eastern parts, but N to NE 15
to 20 in the north-west, otherwise W to SW 15 to 25. It will
become N 15 to 25 over the central parts and NW 30 to 35 over
the western parts towards end of the period.
VIS : Good but moderate in showers and rain in the extreme
north-east and south-western parts, spreading to the central
south towards the end of the period.
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 5.0m in the south and south-east,
with mainly SW swell becoming NW in the extreme west towards
the end of the period.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : N to NE 10 to 20 in the west and south-west where it will
reach 25 in the second half of the period, but W to NW in the
far south-east, otherwise E to SE 05 to 15.
VIS : Good, but moderate in showers and rain in the extreme south
during the first half of the period.
SEA STATE: 3.0 to 3.5m, except in the north-west, with S to SW swell but
with SE swell in the extreme northern parts near Madagascar.
MOZAMBIQUE CHANNEL:
WIND : S to SE 10 to 20.
VIS : Good, but moderate in showers and thundershowers in the north.
SEA STATE: 3.0m in the south-east towards the end of the period, with SE
swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : SE to E 10 to 20, but NE 10 to 15 in the south-west.
VIS : Good in the south-west, otherwise moderate to poor in showers
and thundershowers.
SEA STATE: 3.0 to 3.5m in the south, with SE swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to SW 20 to 30, reaching 35 to 40 in the southern half, but
only over the south-eastern parts toward the end of the
period.
VIS : Moderate in showers and rain (with snow showers in the south
at first) becoming poor in showers and thundershowers over the
extreme north-west towards the end of the period.
SEA STATE: 5.0 to 7.0m, reaching 7.5 to 8.5m in the south and south-
eastern parts during the second half of the period, with W to
SW swell.
AREA 2:
=======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA
ACK (AMSTERDAM-CROZET-KERGUELEN)
25/05/08 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, 25/05/08 AT 1200UTC
- COLD FRONT AXIS: 37S/47E, 42S/71E, 46S/75E, 50S/74E, 52S/69E WITH
LOW 970 HPA MOVING RAPIDLY EASTWARD.
- HIGH 1024 HPA NEAR 31S/67E, EXPECTED 1028 HPA NEAR 33S/83, THE
05/09 AT 06UTC.
PART 3: FORECAST FOR 24 HOURS FROM 25/05/08 AT 1800UTC TO 25/05/09
AT 1800UTC
WAM (30S/40S, 50E/65E)
FRONTAL SHOWERS.
WIND : NORTH-WEST 5 TO 7 FROM NORTHERN TO SOUTHERN AHEAD THE FRONT,
BACKING SOUTH-WEST 5 TO 6 BY WESTERN PART IN THE MORNING, DECREASING
3 TO 4 IN THE AFTERNOON.
SEA: MODERATE TO VERY ROUGH FROM NORTH TO SOUTH. SOUTH-WEST SWELL
3M50 TO 4M50M.
VISI : POOR UNDER PRECIPITATIONS.
AMS (30S/40S, 65E/80E)
SHOWERS OVER WESTERN LATER.
WIND : ANTICLOCKWISE 2 TO 3 OVER NORTHERN, SETTING-UP NORTH-WEST 5
TO 7 OVER SOUTHERN AHEAD THE FRONT, BACKING SOUTH-WEST 5 TO 6 BY
SOUTH-WESTERN PART AT END.
SEA: MODERATE TO ROUGH OVER NORTHERN, VERY ROUGH OVER SOUTHERN.
SOUTH-WEST SWELL 2M50 TO 4M50.
VISI : POOR WITH PRECIPITATIONS.
CRO (40S/50S, 50E/65E)
SHOWERS AND SQUALLS.
WIND : WESTERLY 6 TO 7, INCREASING LOCALLY 8 BY SOUTHERN AT END.
GUSTS.
SEA: VERY ROUGH TO HIGH. SOUTH-WEST SWELL 4 TO 5M.
VISI : POOR TO VERY POOR UNDER PRECIPITATIONS.
KER (40S/50S, 65E/80E)
SHOWERS AND SQUALLS.
WIND : WESTERLY 7 TO 8 OVER SOUTHERN, LOCALLY 9 OVER FAR
SOUTH-EASTERN AT BEGINNING. TEMPORARY ANTICLOCKWISE 3 TO 4 OVER FAR
NORTHERN AREA. SETTING-UP WESTERLY TO NORTH-WEST 5 TO 7, LOCALLY 8
OVER FAR NORTHERN PART DURING THE DAY. GUSTS.
SEA: VERY ROUGH, LOCALLY HIGH IN SOUTH. WESTERLY SWELL 4 TO 6 M.
VISI: VERY POOR WITH PRECIPITATIONS.=