METAREA 7 bulletinset


HIGH SEAS FORECAST
FQZA31 FAPR 181700

WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.

ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE

18TH OF APRIL 2026 AT 17:00 UTC.

FOR SOUTH-EAST SECTOR OF METAREA. VII, PREPARED BY REUNION, SEE AREA 2

BELOW.

NOTE: WX OBSERVATIONS.

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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:

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1. CAPE WEST: NW 35 to 45 in the extreme east, but W to SW 35 to 40 in

the south-west and central parts, drifting to the east from mid-period.

2. CAPE EAST: W to NW 35 to 40 in places in the west and south-west, but 45 in the west towards the end of the period.

3. DURBAN EAST: E to NE 35 in the south-west from the evening.

4. MARION FORTIES EAST: N to NW 35 in the east and south-east at first, as well as in the west by the end of the period.

SYNOPTIC CHART 12:00Z

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High 1028 hPa 50s22w, High 1024 hPa 45s60e

Low 983 hPa 51s15e, Low 985 hPa 47s35e

1. Cold Front: 37s03w 37s04e 39s11e 44s17e 47s18e into 51s15e

2. Cold Front: 30s34e 37s37e 41s38e into 47s35e

AREA FORECAST:

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ASCENSION (06S/15S, 00E/20W):

WIND : E to SE 10 to 20.

VIS : Good.

ANGOLA (06S/15S, 00E/00N):

WIND : S to SE 10 to 20, but SW 05 to 10 in the east.

VIS : Good.

ST HELENA (15S/30S, 00E/20W):

WIND : N to NE 15 to 25 in the south-west, otherwise E to SE 10 to

20.

VIS : Good, but moderate in showers and thundershowers in the south-

western parts.

SEA STATE: 3.0m in the south-east towards the end of the period, with NE

swell.

TRADES (15S/30S, 00E/WEST COAST):

WIND : SW 10 to 20 in the southern parts, otherwise S to SE 10 to 20,

reaching 25 to 30 in the north-east.

VIS : Good.

SEA STATE: 3.0 to 4.0m in the south from mid-period, with S to SW swell.

TRISTAN (30S/40S, 00E/20W):

WIND : S to SW 15 to 25 in the eastern parts, but E to NE 20 to 30 in

the west, it will become light and variable in the north-west

tomorrow morning, otherwise anti-cyclonic 05 to 15.

VIS : Good, but moderate to poor in showers and thundershowers in

the West, clearing in the north-west from the morning.

SEA STATE: 3.0 to 4.0m in the west and east, reaching 4.5 to 5.0 in the

extreme south-east until mid-period, with NE swell in the

west, otherwise, S to SW in the east.

CAPE WEST (30S/40S, 00E/20E):

WIND : NW 20 to 30 in the east and south-eastern parts, reaching 35

to 45 in the extreme east, otherwise, W to SW 15 to

25,reaching 30 to 40 in the south-west and central parts,

drifting to the east from mid-period.

VIS : Moderate in showers and rain in places, clearing in the west

and north from the morning, but poor in showers and

thundershowers in the eastern parts.

SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m in the central, south and

eastern parts, spreading to the north from the afternoon, with

SW swell.

CAPE EAST (32.5S/40S, 20E/50E):

WIND : Anti-cyclonic 05 to 15 in the north and central parts,

drifting to the east in the morning, otherwise W to NW 15 to

25, reaching 30 to 40 in places in the west and south-west, but

45 in the west towards the end of the period.

VIS : Good, but moderate to poor in showers and thundershowers in

the east and western parts, clearing in the east from the

morning.

SEA STATE: 3.0 to 4.0m in the central and west, reaching 5.0 to 6.0 in

the south-west, spreading to the west from the morning, with W

to SW swell.

DURBAN EAST (32.5S/25S, EAST COAST/55E):

WIND : E to NE 05 to 15, but 20 to 30 in the south-west, spreading to

the west from mid-period, reaching 35 in the south-west from

the evening.

VIS : Good, but moderate in showers and thundershowers in places in

the south-west until mid-period.

SEA STATE: 3.0 to 3.5m in the south-west, with SW swell.

MOZAMBIQUE CHANNEL:

WIND : Variable 05 to 10 in the central and south-eastern parts,

otherwise, E to NE 05 to 15, reaching 20 to 25 in the south-

west at times.

VIS : Good.

MADAGASCAR EAST (10S/25S, EAST COAST/55E):

WIND : E to NE 05 to 15 in the south, otherwise E to SE 10 to 20.

VIS : Good, but moderate in showers and thundershowers in places in

the north.

MARION FORTIES EAST (40S/50S, 35E/50E):

WIND : W to SW 20 to 30 in the west drifting to the south-east from

mid-period, otherwise N to NW 15 to 25, reaching 30 to 35 in

the east and south-east at first, as well as in the west by

the end of the period.

VIS : Good, but moderate to poor in showers and thundershowers in

the south and eastern parts at first, as well as in the west

towards the end of the period.

SEA STATE: 3.0 to 4.0m except in the north-east, reaching 4.5 to 5.0m in

the south-east, 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)

26/04/18 AT 1600UTC

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, 26/04/18 AT 1200UTC

- COLD FRONT OVER WESTERN CRO AT END OF NIGHT, MOVING EASTWARD

QUICKLY.

- CONVERGENCE LINE LYING BETWEEN EASTERN WAM AND WESTERN AMS.

- HIGHS 1026 HPA NEAR 36S/74E AND 1027 HPA NEAR 45S/66E EXPECTED 1032

HPA NEAR 39S/80E AT END.

PART 3: FORECAST FOR 24 HOURS FROM 26/04/18 AT 1800UTC TO 26/04/19

AT 1800UTC

WAM (30S/40S, 50E/65E)

SHOWERS AND SQUALLS OVER EASTERN.

WIND: VARIABLE 3 TO 4. GUSTS UNDER SQUALLS.

SEA : MODERATE.

VISI: POOR UNDER PRECIPITATION.

AMS (30S/40S, 65E/80E)

SHOWERS AND SQUALLS AT TIMES THUNDERY OVER FAR WESTERN.

WIND: ANTICLOCKWISE 3 TO 5, SETTLING-UP NORTHERLY 4 TO 5, LOCALLY 6,

LATER OVER WESTERN. GUSTS UNDER SQUALLS.

SEA: MODERATE, LOCALLY ROUGH OVER FAR SOUTHEASTERN BY SOUTH SWELL 3

M.

VISI: POOR IN PRECIPITATION.

CRO (40S/50S, 50E/65E)

FRONTAL RAIN AND SHOWERS.

WIND: ANTICLOCKWISE 3 TO 5 OVER EASTERN AT BEGINNING, SETTING-UP

NORTHERLY TO NORTH-WEST 5 TO 7 BY WESTERN DURING THE NIGHT WITH THE

FRONT WITH VIOLENT GUSTS IN THE SOUTH. DECREASING 3 TO 6 FROM NORTH

TO SOUTH AT END.

EA : MODERATE TO ROUGH FROM NORTH TO SOUTH, BECOMING VERY ROUGH OVER

FAR SOUTHERN LATER. WESTERLY 2 TO 3M IN SOUTH.

VISI: POOR TO VERY POOR IN PRECIPITATION.

KER (40S/50S, 65E/80E)

SCATTERED SHOWER.

WIND: SOUTH-WEST 6 TO 7 OVER SOUTH-EASTERN AT BEGINNING, SETTING-UP

ANTICLOCKWISE 3 TO 5 BEHIND THEN NORTH-WEST 6 TO 7 BY SOUTH-WESTERN

AT END OF DAY.

SEA : MODERATE TO VERY ROUGH FROM NORTH-WESTERN TO SOUT-EASTERN.

SOUTH-WESTERLY SWELL 2 TO 3M, LOCALLY 4 M OVER SOUTH-EASTERN.

VISI: POOR IN PRECIPITATION.=