WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
11TH OF JUNE 2026 AT 13:30 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 112200 TO 122200 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 SW 35 to 40 in the south-east until towards the end of
the period.
2. CAPE EAST: NW 35 in the south-east but W to SW 35 to 40 over the
western half, spreading over the central parts towards the
end of the period, while moderating from the west.
3. MARION FORTIES EAST: NW 35 to 40 in the north-west, spreading to the
east and south-east towards the end of the period, while
becoming SW 35 to 40 from the west.
SYNOPTIC CHART 12:00Z
=====================
High 1033 hPa 40s21w, High 1024 hPa 34s38e
Low 982 hPa 50s34e, Low 1001 hPa 31s51e
1. Cold Front: 25s02e 35s15e 40s21e into 50s34e
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : SE to E 10 to 20.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 10 to 20, but variable 05 to 10 in the east.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : E to SE 10 to 20, but NE 15 to 25 in the south-west.
VIS : Good but moderate to poor in showers and thundershowers in the
south-west.
SEA STATE: 3.0m in the south-west at first, with E to NE swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 10 to 20, but SW 10 to 20 in the south-east until mid-
period.
VIS : Good, but moderate in showers and rain in the south-east at
first.
TRISTAN (30S/40S, 00E/20W) :
WIND : E to NE 15 to 25 in the north-west, otherwise anticyclonic 05
to 15 but S to SW 10 to 20 in the east and south-east.
VIS : Good, but moderate in showers and rain in the north.
SEA STATE: 3.0 to 3.5m in the south-east, with SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : NW 15 to 25 in the extreme east at first, otherwise S to SW 15
to 25 reaching 30 to 40 in the south-east until towards the
end of the period, while becoming SE to E 05 to 15 in the
north.
VIS : Moderate in showers and rain, becoming good from the west
towards mid-period.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m over the south-eastern
parts, with W to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : S to SE 15 to 25 in the north-east until towards the end of
the period, otherwise NW 15 to 25 reaching 30 to 35 in the
south-east but W to SW 30 to 40 over the western half,
spreading over the central parts towards the end of the
period, while moderating to 15 to 25 from the west.
VIS : Good, but moderate to poor in showers and thundershowers in
the western half, spreading over the central parts towards
mid-period.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m in the west, spreading over
the central parts towards mid-period, with SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : Cyclonic 20 to 30 in the south-east, otherwise S to SW 10 to
20 reaching 25 to 30 in the south-west towards the end of the
period, but N to NE 15 to 25 in the north-west.
VIS : Good, but moderate to poor in showers and thundershowers in
the east, but in the south-west towards the end of the period.
SEA STATE: 3.0 to 4.0m in the east and west, with S to SE swell, but with
NE to E swell in the south-west.
MOZAMBIQUE CHANNEL:
WIND : S 10 to 20, but N to NW 15 to 25 in the south-west.
VIS : Good.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : W to NW 05 to 15 in the extreme south, otherwise variable 05
to 10, but E to SE 05 to 15 in the north.
VIS : Moderate in showers and thundershowers in places.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : NW 20 to 30 reaching 35 to 40 in the north-west, spreading to
the east and south-east towards the end of the period, while
becoming SW 30 to 40 from the west.
VIS : Moderate to poor in showers and rain.
SEA STATE: 3.5 to 4.5m, reaching 5.0m in places from mid-period, with W
to NW swell.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
2026/06/11 AT 0500UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40% STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE FORCE 8 RUNNING OVER WAM, CRO AND KER.
PART 2: GENERAL SYNOPSIS, 2026/06/11 AT 0000UTC
- HIGH-PRESSURE SYSTEM 1030 HPA NEAR 34S/765E, MOVING SLOWLY EASTWARDS.
- UNDULATING FRONT OVER CRO AND KER, AXIS 45S/50E, 49S/53E, 47S/65E,
47S/73E, 49S/80E.
- LOW-PRESSURE SYSTEM 999 HPA ALMOST STATIONARY DEEPENING OVER NORTH-WESTERN
WAM WITH ASSOCIATED COLD FRONT CF AXIS 29S/45E, 30S/50E AND WARM FRONT WF
AXIS 33S/51E, 34S/57E, 30S/58E.
PART 3: FORECAST FOR 24 HOURS FROM 2026/06/11 AT 0600UTC TO 2026/06/12 AT 0600UTC
WAM (30S/40S, 50E/65E)
SHOWERS AND SQUALLS IN THE NORTH-WESTERN SECTOR WITH WF THEN CF.
WIND: NORTHERLY 3 TO 4, BECOMING 6/7 IN THE LOW-PRESSURE AREA, LOCALLY 8,
WITH GUSTS NEAR THE CENTER OF THE LOW IN THE WESTERN AREA.
SEA : MODERATE TO ROUGH. NORTH SWELL OF 2 TO 3 METERS OVER NORTH-WESTERN
AREA.
VIS : POOR TO VERY POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
SCATTERED SHOWERS.
WIND: ANTICLOCKWISE, 3 TO 4, FRESHENING W 4 TO 5 OVER SOUTHERN AREAS.
SEA : MODERATE TO ROUGH. SOUTH-WESTERLY SWELL OF 2 TO 3 METRES OVER FAR
SOUTHERN.
VIS : GOOD.
CRO (40S/50S, 50E/65E)
RAIN AND FRONTAL SHOWERS WITH AN UNDULATING FRONT AT THE START OF THE PERIOD.
WIND: WEST TO NORTH-WEST, 5 TO 7, LOCALLY 8, WITH GUSTS; LOCALLY, CLOCKWISE
6 TO 8 OVER FAR SOUTH-EAST, THEN NORTH-WEST 5 TO 7 ACROSS THE WHOLE
AREA BY THE END OF THE FORECAST PERIOD.
SEA : MODERATE TO ROUGH, LOCALLY VERY ROUGH OVER SOUTHERN PART OF THE AREA.
W TO SW SWELL 2 TO 3 METERS.
VIS : POOR DURING RAINFALL.
KER (40S/50S, 65E/80E)
RAIN AND SHOWERS ASSOCIATED WITH AN UNDULATING FRONT.
WIND: WESTERLY, FORCE 5 TO 6, INCREASING 6 TO 7, LOCALLY UP TO FORCE 8 WITH
GUSTS; LOCALLY AND TEMPORARILY CLOCKWISE OVER FAR SOUTHERN DURING THE
DAY.
SEA : ROUGH TO VERY ROUGH. WESTERLY SWELL, 2 TO 4 METERS.
VIS : POOR IN RAIN.