WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
21ST OF JULY 2026 AT 17:30 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 212200 TO 222200 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. MARION FORTIES EAST: W to SW 35 in the south-east at first, but NW 35 to
40 in the west from mid-period, spreading to the
south-east by the end of the period.
SYNOPTIC CHART 12:00Z
=====================
High 1027 hPa 29s24w, High 1024 hPa 44s28e, High 1024 hPa 35s52e
Low 943 hPa 53s05w, Low 943 hPa 64s56e
1. Cold Front: 36s17w 40s09w 45s02w into 53s05w
2. Cold Front: 39s31e 45s46e 50s53e 55s58e into 64s56e
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : SE to E 10 to 20.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : SW 05 to 15 in the east, otherwise S to SE 05 to 15, reaching 20
in the south towards the end of the period.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : S to SW 05 to 15 in the south-east until mid-period, otherwise E
to SE 10 to 20.
VIS : Good.
SEA STATE: 3.0m in the south-east until mid-period, with SW swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : W to NW 05 to 15 in the south-west, otherwise S to SE 05 to 15
reaching 20 to 25 in the south-east, but in the north-east
towards the end of the period.
VIS : Good.
TRISTAN (30S/40S, 00E/20W):
WIND : SW 10 to 20 reaching 25 to 30 in the south-east at first, but W
to NW 15 to 25 in the west and south-west, spreading to the
south-east towards the end of the period.
VIS : Good but moderate in showers and rain in the south-west towards
mid-period, spreading to the south-east towards the end of the
period.
SEA STATE: 3.0 to 4.0m reaching 4.5m in the south, with W to SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : W to NW 10 to 20 reaching 25 to 30 in the south. It will become
SW 15 to 25 in the west towards mid-period, spreading over the
central parts towards the end of the period.
VIS : Moderate in showers and rain, but good in the east and north-
east.
SEA STATE: 3.0 to 3.5m over the southern and western halves, reaching 4.0 to
5.0m in the south, with SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : N to NE 15 to 25 in the north, otherwise W to NW 10 to 20
reaching 25 to 30 in the south and west.
VIS : Good but moderate in showers and thundershowers in the south and
the east, but in the south-west towards the end of the period.
SEA STATE: 3.0 to 3.5m reaching 4.0m in the south-west, with SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : Variable 05 to 10 over the central parts, otherwise SE to E 05 to
15 reaching 20 in the north-east towards the end of the period
but NE 15 to 25 in the west.
VIS : Good but moderate to poor in showers and thundershowers in the
east.
SEA STATE: 3.0m in the east and west, with S to SE swell.
MOZAMBIQUE CHANNEL:
WIND : NE 05 to 15 in the south-west, otherwise S to SE 05 to 15
reaching 20 in the east.
VIS : Good.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : S to SE 05 to 15 but SW 05 to 15 in the south until mid-period.
VIS : Good but moderate in showers in the south, spreading to the north
towards the end of the period.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to SW 15 to 25 reaching 30 to 35 in the south-east at first. It
will become NW 30 to 40 in the west from mid-period, spreading to
the south-east by the end of the period.
VIS : Good but moderate in showers and rain in the north-east at first
but in the west and south-west towards the end of the period, but
with snow-showers in the south-east at first.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m in the south, with W to SW
swell, becoming with NW swell in the west towards the end of the
period.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
26/07/21 AT 1700UTC
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, 26/07/21 AT 1200UTC
- LOW 991 HPA NEAR 48S/80E, MOVING EASTWARDS. ASSOCIATED COLD FRONT
AXIS NNW, MOVING EASTWARDS.
- COLD FRONT AXIS NW/SE, CROSSING CRO SOON, THEN KER LATER.
- HIGH 1024 HPA NEAR 35S/51E, SLOWLY MOVING EASTWARDS, EXPECTED 1029
HPA NEAR 33S/55E AT END. ASSOCIATED RIDGE SPREADING OVER AMS LATER.
PART 3: FORECAST FOR 24 HOURS FROM 26/07/21 AT 1800UTC TO 26/07/22
AT 1800UTC
WAM (30S/40S, 50E/65E)
FEW SHOWERS, THEN FRONTAL SHOWERS OVER FAR SOUTHERN LATER.
WIND : CLOCKWISE 2 TO 4 BUT W 5 OR 6 WITH GUSTS OVER FAR SOUTHERN.
SEA : ROUGH BECOMING MODERATE OR ROUGH FROM WEST. S SWELL 3 OR 4
METERS ABATING.
VISI : POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
FRONTAL SHOWERS AND RAIN OVER FAR NORTHEASTERN, FEW SHOWERS
ELSEWHERE.
WIND : AHEAD THE FRONT, NW 4 OR 5 OVER NORTHERN, 5 OR 6, LOCALLY 7
WITH GUSTS OVER SOUTHERN. BEHIND THE FRONT, W OR SW 3 OR 4 OVER
NORTHERN, 5 OR 6 OVER SOUTHERN. BECOMING ANTICLOCKWISE 2 TO 4 FROM
WEST LATER, BUT W 5 OR 6 WITH GUSTS OVER FAR SOUTHWESTERN AT END.
SEA : ROUGH TO VERY ROUGH FROM NORTH TO SOUTH. SW SWELL 3 TO 4 M,
ABATING.
VISI : POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
FRONTAL SHOWERS AND RAIN OVER NORTHERN, SCATTERED SHOWERS OVER
SOUTHERN.
WIND : AHEAD THE FRONT : NW 5 OR 6, LOCALLY 7. GUSTS. BEHIND THE
FRONT : S OR SW 5 OR 6, LOCALLY 7 WITH GUSTS OVER FAR SOUTHERN,
BECOMING ANTICLOCKWISE 2 TO 4 OVER WESTERN AT END.
SEA : ROUGH TO VERY ROUGH, LOCALLY HIGH OVER FAR SOUTHERN LATER. W
THEN SW SWELL 4 OR 5 METERS.
VISI : POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
FRONTAL SHOWERS AND RAIN OVER EASTERN AT FIRST, SCATTERED SHOWERS
ELSEWHERE, THEN FRONTAL SHOWERS AND RAIN FROM WEST LATER.
WIND : AHEAD THE FIRST FRONT : NW 6 OR 7. SW 5 OR 6 BEHIND, BECOMING
SOON W 5 OR 6, THEN NW 5 OR 6, LOCALLY 7, AHEAD THE SECOND FRONT AND
S OR SW 5 OR 6, LOCALLY 7 BEHIND. GUSTS.
SEA : ROUGH TO VERY ROUGH.SW SWELL 2 TO 4 METERS.
VISI : POOR IN PRECIPITATION.