WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
18TH 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 182200 TO 192200 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 : N to NW 35 to 40 in the south-west until mid-period,
becoming S to SW 35 in the south-west that will spread to
the central-south towards mid-period.
2. CAPE EAST : W to SW 35 in the central-south, moving to the east by
mid-period.
3. MARION FORTIES EAST: W to SW 35 to 40 in the north-west spreading
to the north-east by mid-period, becoming NW 35
in the south-west by end of the period.
SYNOPTIC CHART 12:00Z
=====================
High 1032 hPa 37s06e, High 1024 hPa 29s37e
Low 992 hPa 47s40e
1. Cold Front: 36s22e 38s35e 43s42e 49s41e into 47s40e.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 15 to 25.
VIS : Good.
SEA STATE: 3.0m until mid-period, with E to SE swell.
ANGOLA (06S/15S, 00E/00N):
WIND : SW 05 to 15 in the east, otherwise S to SE 10 to 20, reaching
25 to 30 in the south and south-east.
VIS : Good.
SEA STATE: 3.0m until mid-period, except in the north-west with SE swell.
ST HELENA (15S/30S, 00E/20W):
WIND : N to NE 15 to 25 in the west, otherwise E to SE 15 to 25 but
NW to W 20 to 30 in the south-west and SW 10 to 20 in the
extreme south-west where it will become SE by end of period.
VIS : Good, but moderate to poor in showers and thundershowers in
the extreme south-west.
SEA STATE: 3.0m, except in the south-east, reaching 4.0m in the south-
west, with E to SE swell, but NW in the south-west.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 15 to 25.
VIS : Good.
SEA STATE: 3.0 to 4.0m, until mid-period, with SE swell.
TRISTAN (30S/40S, 00E/20W):
WIND : N to NW 20 to 30, reaching 35 to 40 in the south-west until
mid-period, becoming S to SW 15 to 25 in the west reaching 35
in the south-west that will spread to the central-south
towards mid-period, while becoming S to SE 15 to 25 in
the north-west.
VIS : Good, but moderate to poor in showers and thundershowers in
the west, spreading in a band to the central parts by mid-
period and south-east by end of period.
SEA STATE: 3.0 to 4.0m, except in the north-east, reaching 4.5 to 5.0m in
the south-west, spreading to the central south by mid-period,
with NW swell, but SW swell in the south-west from mid-period.
CAPE WEST (30S/40S, 00E/20E):
WIND : NW 15 to 25 in the south-west, otherwise S to SE 15 to 25,
becoming NE 10 to 20 in the south-east by end of the period.
VIS : Good.
SEA STATE: 3.0m in the east and 4.0m in the south-east and south-west
with a SW swell, but SE in the north-east.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : W to SW 15 to 25, reaching 30 to 35 in the central south
moving to the east by mid-period, while becoming anticyclonic
05 to 15 in the west reaching 25 in the north-west towards end
of period.
VIS : Moderate in showers and rain in places, but good in the west.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m in the central parts south
where it will reach 6.5m to 7.0m spreading to the east by end
of period, with SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : Anticyclonic 05 to 15 in the north, otherwise W to SW 10 to
20, reaching 25 to 30 in the central south towards mid-period,
spreading to the central parts by end of period.
VIS : Good, but moderate in showers and thundershowers in the west,
spreading to the central south by mid-period, while clearing
in the south-west, it will spread to the east by end of
period.
SEA STATE: 3.0 to 3.5m in the south, spreading to the north by mid-
period, while reaching 4.0 to 6.0m in the central-south by end
of period, with S to SW swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 05 to 15, reaching 20 to 25 in the south.
VIS : Good.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : Variable 05 to 10 in the south, otherwise E to SE 10 to 20,
reaching 25 in the extreme north-west, becoming SW 05 to 15 in
the south-west by end of period.
VIS : Moderate in showers and rain in places.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to SW 20 to 30 reaching 35 to 40 in the north-west spreading
to the north-east by mid-period, otherwise SE to S 20 to 30,
it will become NW 15 to 25 in the south-west from mid-period
where it will reach 30 to 35 by end of the period.
VIS : Good, but moderate in showers and rain in a band in the
central parts, while clearing from the south it will spread to
the north by mid-period and becoming moderate in rain in the
south-west by end of period.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.5m in the north-west, with SW
Swell, becoming NW in the south-west by end of period.
AREA 2:
=======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
26/06/18 AT 0600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40% STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- STRONG WINDS CURRENTLY AFFECTING AMS AND KER.
PART 2: GENERAL SYNOPSIS, 26/06/18 AT 0000UTC
- HIGH-PRESSURE 1028 HPA NEAR 35S/80E, MOVING SLOWLY EASTWARDS, WEAKENING.
- COLD FRONT (CF) AXIS 36S/50E, 45S/60E, 37S/53E, 40S/57E.
- WARM FRONT (WF) AXIS 28S/60E, 30S/55E, 34S/64E, 42S/65E, 46S/68E, 51S76E.
- COLD FRONT (CF) AXIS 37S18E, 40S25E, 49S32E, MOVING ENE.
- WARM FRONT (WF) AXIS 9S32E, 47S36E, 43S38E, MOVING ENE.
PART 3: FORECAST FOR 24 HOURS FROM 26/06/18 AT 0600UTC TO 26/06/19 AT 0600UTC
WAM (30S/40S, 50E/65E)
HEAVY RAIN AND THUNDERSTORM UNDER WF, WG AND CG, FREQUENT SHOWERS UNDER CF.
WIND: SW TO W 5/6 DECREASING 3/4 FROM THE WEST, VEERING NW 6/7 OVER THE
WESTERN PART OF THE AREA FROM TONIGHT.
SEA : ROUGH TO VERY ROUGH. SOUTH-WESTERLY SWELL FROM 3 TO 4 METERS.
VIS : POOR TO VERY POOR UNDER HEAVY RAIN OR THUNDERSTORM.
AMS (30S/40S, 65E/80E)
HEAVY RAIN AND THUNDERSTORM UNDER WF, FREQUENT SHOWERS UNDER CF.
WIND: VARIABLE 3/4 IN THE NORTH-EAST OF THE AREA. ELSEWHERE, NORTHWESTERLY
TO NORTHERLY 5 TO 7 LOCALLY 8, VEERING WEST TO SOUTH-WESTERLY 4 TO 6
FROM THE WEST.
SEA : ROUGH TO VERY ROUGH WITH CROSS SEA CAUSED BY A SOUTH-WESTERLY SWELL OF
2 TO 3M.
VIS : POOR TO VERY POOR UNDER HEAVY RAIN OR THUNDERSTORM.
CRO (40S/50S, 50E/65E)
HEAVY RAIN AND THUNDERSTORM UNDER WF, WG AND CG, FREQUENT SHOWERS UNDER CF.
WIND: SOUTHWESTERLY TO SOUTHERLY FORCE 5/6 OCCASIONALLY 7, VEERING
SOUTHWESTERLY TO WESTERLY AND DECREASING FORCE 3/4 FROM THE WEST, THEN
VEERING NORTHWESTERLY FORCE 6/7 OVER THE NORTH-WESTERN PART OF THE
AREA, AND VARIABLE FORCE 3/4 OVER THE SOUTH-WESTERN PART OF THE AREA
FROM TONIGHT.
SEA : ROUGH TO VERY ROUGH WITH SOUTHWESTERLY SWELL 3 TO 4M50 FROM NORTH TO
SOUTH.
VIS : POOR TO VERY POOR UNDER HEAVY RAIN OR THUNDERSTORM.
KER (40S/50S, 65E/80E)
HEAVY RAIN AND THUNDERSTORM UNDER WF, FREQUENT SHOWERS UNDER CF.
WIND: AHEAD OF WF, NORTH-WESTERLY 6/7, OCCASIONALLY 8 ; BEHIND WF,
SOUTHERLY TO SOUTH-WESTERLY 5/6 DECREASING TO 3/4 ; WESTERLY 5/6 OVER
THE SOUTHERN PART OF THE AREA.
SEA : VERY ROUGH BECOMING ROUGH IN THE NORTHWESTERN PART OF THE AREA.
SOUTHWESTERLY SWELL BETWEEN 3M AND 4M50. CROSS SEA AHEAD OF WF.
VIS : POOR TO VERY POOR UNDER HEAVY RAIN OR THUNDERSTORM.