WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
17th OF JULY 2026 AT 16:30 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 172200 TO 182200 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 EAST: Cyclonic 35 to 40 over the eastern parts.
2. MARION FORTIES EAST: Cyclonic 35 to 45 in places in the north
and north-east.
SYNOPTIC CHART 12:00Z
=====================
High 1033 hPa 30s31w, High 1028 hPa 47s24e
Low 1014 hPa 36s00w, Low 1014 hPa 39s17e, Low 1004 hPa 39s39e
1. Cold Front: 34s30e 35s36e 37s40e into 39s39e
AREA FORECAST:
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ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 05 to 15.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SW 05 to 10 in the east, otherwise SE 05 to 10.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : N to NW 05 to 15 in the south-east at first, otherwise S to SE
10 to 20 but variable 05 to 15 in the north-east.
VIS : Good but moderate in showers and thundershowers in the places
in the central, southern and western parts.
SEA STATE: 3.0m in the south and north-west, with S to SW swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : Variable 05 to 15 but S to SE 05 to 15 in the central and
northern parts.
VIS : Good.
TRISTAN (30S/40S, 00E/20W):
WIND : Anti-cyclonic 10 to 20 reaching 25 in the
north-east and in the south-west towards the end of the
period.
VIS : Good but moderate in showers and thundershowers in the
north-east until mid-period.
SEA STATE: 3.0m in the south-west and north-east, with S to SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : Variable 05 to 15 in the northern parts, otherwise cyclonic 10
to 20 reaching 25 in the south-east becoming anti-cyclonic 10
to 20 in the west from the second half of the period.
VIS : Good but moderate in showers and rain in places in the west
and southern parts.
SEA STATE: 3.0 to 4.0m in the southern and western parts, subsiding from
the south-west towards mid-period, with S to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : W to SW 10 to 20 in the north-west, otherwise cyclonic 35 to
40 over the eastern parts but cyclonic 10 to 20 in the west
reaching 25 to 30 in the south-west.
VIS : Good but moderate to poor in showers and thundershowers in
places except the north-west.
SEA STATE: 3.0 to 4.0m in the western parts, reaching 5.0 to
7.0m in the central and eastern parts, with W to SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : Variable 05 to 15, but W to SW 15 to 25 in the southern parts
Reaching 30 in the south and south-east from mid-period but
anticyclonic 05 to 15 in the north-west.
VIS : Good.
SEA STATE: 3.0 to 4.0m in the southern parts reaching 5.0 to 6.0m in the
south and south-east, with S to SW swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 10 to 20 in the northern and eastern parts but
variable 05 to 10 in the south-west.
VIS : Good.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : S to SE 05 to 15 but variable 05 to 10 in the south and south-
west.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : Cyclonic 20 to 30, reaching 35 to 45 in places in the north
and north-east, otherwise anti-cyclonic 10 to 20.
VIS : Good but moderate to poor in showers and thundershowers in the
north and north-east.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 7.0m in the north and north-east,
with S to SE swell but SW swell in the south.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA
ACK (AMSTERDAM-CROZET-KERGUELEN)
26/07/17 AT 1600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE TO STRONG GALE EXPECTED OVER NORTH-WESTERN CRO AND WESTERN
WAM.
PART 2: GENERAL SYNOPSIS, 26/07/17 AT 1200UTC
- HIGH 1026 NEAR 32S/79E STEADILY MOVING EASTWARD.
- COLD FRONT AXIS 35S/54E, 41S/65E, 46S/71E ET 53S/77E STEADILY
MOVING EASTWARD.
- DEEPENING LOW 996 NEAR 40S/38E STEADILY MOVING EASTWARD.
PART 3: FORECAST FOR 24 HOURS FROM 26/07/17 AT 1800UTC TO 26/07/18
AT 1800UTC
WAM (30S/40S, 50E/65E)
FRONTAL RAIN AND SHOWERS, THEN RAINS AND SHOWERS DUE TO LOW.
WIND: NW 4/5 AHEAD OF THE FRONT AT TIMES 6, BACKING SOUTHERLY 3/4
BEHIND, BECOMING SOON CLOCKWISE 5/6 FROM WEST INCREASING
7/8, LOCALLY 9 OVER FAR SOUTH-WESTERN AT END. SEVERE GUSTS.
SEA : MODERATE TO ROUGH, BECOMING VERY ROUGH TO HIGH OVER WESTERN
LATER BY SW SWELL 4 TO 5M.
VIS : POOR OR VERY POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
FRONTAL RAIN AND SHOWERS OVER SOUTHERN. SHOWERS OVER FAR NORTHERN.
WIND:
NORTHERN HALF: NORTHERLY 2/4.
SOUTHERN HALF : NW 5/6 AHEAD OF THE FRONT AT TIMES 7 WITH GUSTS,
BECOMING VARIABLE 2/4 BEHIND, THEN NORTHERLY 5/6
FROM WEST AT END.
SEA : MODERATE TO ROUGH.
VIS : POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
RAIN AND SHOWERS OVER NORTHERN.
WIND:
NORTHERN HALF: INCREASING E 7/8 GRADUALLY FROM WEST, BECOMING
CLOCKWISE OVER NORTH-WESTERN AT END LOCALLY 9.
SEVERE GUSTS.
SOUTHERN HALF: VARIABLE 2/4 BUT W 4/5 OVER FAR SOUTHERN AT TIMES 6
WITH GUSTS.
SEA : ROUGH TO VERY ROUGH BY SW SWELL 3 TO 4M ABATING, BECOMING LATER
MODERATE TO ROUGH OVER SOUTHERN BUT VERY ROUGH TO HIGH
OVER NORTHERN.
VIS : POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
FRONTAL RAIN AND SHOWERS. SCATTERED SHOWERS BEHIND. RAIN AND SHOWERS
OVER NORTH-WESTERN AT END.
WIND: NW 6/7 AHEAD OF THE FRONT, BACKING WESTERLY TO SOUTH-WESTERLY
5/6 BEHIND. GUSTS. BECOMING VARIABLE 2/4 OVER NORTH-WESTERN
LATER BUT INCREASING NE 6/7 WITH GUSTS OVER FAR NORTH-WESTERN
AT END.
SEA : ROUGH TO VERY ROUGH. WESTERLY SWELL 3 TO 4M.
VIS : POOR IN PRECIPITATION.