WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
18TH OF MAY 2026 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 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 in the north-west towards the central-south from
mid-period
2. CAPE WEST: S to SE 35 in the central-east.
3. MARION FORTIES EAST: W to SW 35 to 40 in the southern parts, where it
will reach 45 by mid-period. It will become SW 35
in the south-east by end of period.
SYNOPTIC CHART 12:00Z
=====================
High 1034 hPa 42s12e, High 1028 hPa 36s51e.
Low 1001 hPa 49s06w, Low 971 hPa 60s51e.
1. Cold Front: 32s12w 39s05w 46s02w 50s05w into 49s06w.
2. Cold Front: 46s55e 51s63e 55s63e 60s58e into 60s51e.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 10 to 20.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SW 05 to 10 in the east, otherwise S to SE 10 to 20.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : N to NW 05 to 15 in the south and south-west, otherwise E to
SE 05 to 15.
VIS : Good, but moderate in rain and showers in the south-west.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 10 to 20, reaching 25 in the south-east.
VIS : Good.
SEA STATE: 3.0m in the central and southern parts, with S to SE
swell.
TRISTAN (30S/40S, 00E/20W) :
WIND : NE to E 10 to 20 in the north-east, otherwise N to NW 15 to
25, reaching 30 to 35 in the north-west towards the central-
south from mid-period, while becoming SW 15 to 25 in the
south-west.
VIS : Good, but moderate to poor in showers and thundershowers in
A band from north-west to central-south, spreading to the
south-east by end of period and in rain in the south-west
until mid-period.
SEA STATE: 3.0 to 3.5m in places in the south-east, reaching 4.0m in the
south-west, drifting to the central part towards end of
period, with NW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : N to NW 10 to 20 in the south-west, otherwise S to SE 15 to
25 in the east, reaching 35 in the central-east, becoming
cyclonic 10 to 20 in the north-east from mid-period.
VIS : Good, but moderate in showers and thundershowers in places in
the central-east.
SEA STATE: 3.0 to 4.0m in places in the north and east, reaching 5.0m in
the central-east towards end of period, with S to SE swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : Anti-cyclonic 05 to 15 int north-east, otherwise NW 10 to 20
but S to SE 15 to 25 in the west and central-south, reaching
30 in the north-west by mid-period, becoming SW 10 to 20 in
the south-east by end of period.
VIS : Good, but moderate in light showers and thundershowers in
places in the north-west, central and south-east.
SEA STATE: 3.0 to 4.0m in the south and western parts, with SW swell, but
SE in the north-west.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : N to NW 05 to 15 in the west, otherwise E to SE 15 to 25 but
SW 05 to 15 in the extreme south-west.
VIS : Moderate in showers and thundershowers in places, but poor in
places in the east and central-west.
SEA STATE: 3.0 to 4.0m in the east and central parts, with S to SE swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 10 to 20, reaching 25 in the south-east at times, but
SW 10 to 20 in the north.
VIS : Good, but moderate in showers in places.
SEA STATE: 3.0m in the south and central parts until mid-period, with S
to SE swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : S to SE 05 to 15, reaching 25 in the north.
VIS : Good, but moderate in showers and rain in places in the west
and north.
SEA STATE: 3.0m in the south, spreading to the north-east by end of
period, with SE swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : N to NW 10 to 20 in the north-east, otherwise, W to SW 15 to
25, reaching 30 to 40 in the southern parts, where it will
reach 45 by mid-period. It will become SW 15 to 25 reaching 35
in the south-east by end of period.
VIS : Good, but moderate in showers and rain in the north-east and
in the southern parts.
SEA STATE: 3.0 to 4.0m in the west and central parts, but 5.0 to 6.0m in
the southern half, reaching 6.5 to 7.5m in the extreme south,
becoming 8.0 to 9.0m in the central-south and south-east from
mid-period, with W to SW swell.
AREA 2:
=======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA
ACK (AMSTERDAM-CROZET-KERGUELEN)
26/05/18 AT 1600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE FORCE 8 OVER CRO AND KER.
PART 2: GENERAL SYNOPSIS, 26/05/18 AT 1200UTC
- COLD FRONT AXIS: 44S/50E, 45S/53E, 48S/58E, 50S/60E, MOVING
EASTWARD AND EXPECTED NEAR 43S/72E, 44S/76E, 46S/77E, 47S/78E,
50S/78E THE 05/19 AT 06 UTC
- ANTICYCLONIC BELT 1028 HPA OVER WAM AND AMS.
PART 3: FORECAST FOR 24 HOURS FROM 26/05/18 AT 1800UTC TO 26/05/19
AT 1800UTC
WAM (30S/40S, 50E/65E)
RAIN OR SHOWERS OVER FAR NORTHERN. FRONTAL SHOWERS BY SOUTH-WESTERN
AT END.
WIND : ANTICLOCKWISE 3 TO 5 INCREASING EAST 6 OVER NORTHERN.
NORTH-WEST 6 OVER SOUTHWESTERN LATER, BACKING SOUTH-WEST 6 BEHIND AT
END.
SEA : MODERATE TO ROUGH.
VISI : POOR UNDER PRECIPITATION.
AMS (30S/40S, 65E/80E)
SCATTERED SHOWERS.
WIND : ANTICLOCKWISE 3 TO 5.
SEA : ROUGH TO VERY ROUGH, BECOMING MODERATE BY WESTERN AT END.
SOUTH-WEST SWELL 3 TO 4 M.
VISI : POOR UNDER PRECIPITATION.
CRO (40S/50S, 50E/65E)
FRONTAL RAINS AND SHOWERS.
WIND : WESTERLY 6 TO 8 FROM NORTH TO SOUTH, SETTING-UP SOUTH-WEST 7
TO 8 BY WESTERN AT END. GUSTS.
SEA : ROUGH TO VERY ROUGH, BECOMING HIGH OVER SOUTH-WESTERN.
SOUTH-WEST SWELL 3 TO 4 M.
VISI : VERY POOR UNDER PRECIPITATION.
KER (40S/50S, 65E/80E)
RAIN, AND FRONTAL SHOWERS.
WIND : SOUTH-WEST 6 OVER EASTERN, VEERING NORTH-WEST 7 AHEAD THE
FRONT, BACKING WESTERLY 6 TO 8 FROM NORTH TO SOUTH BEHIND. STRONG
GUSTS. NORTH-WEST 5 TO 6 OVER WESTERN AT END.
SEA : ROUGH TO VERY ROUGH. WESTERLY SWELL 3 TO 4 M.
VISI : POOR TO VERY POOR DURING RAINFALL.=