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High Seas Forecasts

 

DATE ISSUED: 14/08/2015

 

 

 

FORECAST VALID FROM 132200 TO 142200 UTC:

 

WIND IN KNOTS, WAVE HEIGHTS IN METERS. NO SEA STATE GIVEN IF WAVES LESS THAN 3M.

 

GALE WARNINGS:

==============

1. TRISTAN: SW 35 in the south-west by tomorrow morning.

2. CAPE WEST: W to NW 35 in the south-east.

3. CAPE EAST: NW 35 in the east, but SW 35 in the west, spreading to the east by end of the period.

4. DURBAN EAST: NW 35 in the extreme-west at first.

5. MARION FORTIES EAST: N to NW 35 to 40, but W 35 in the west, spreading to the east by end of the period.

 

SYNOPTIC SITUATION AT 12:00Z

============================

High 1036 hPa 43s70e High 1028 hPa 31s23w.

Low 960 hPa 53s34e Low 944 hPa 64s31e Low 1004 hPa 33s34e.

 

1. Cold front: 33s15e 43s30e 49s33e into 53s34e 58s36e into 64s31e.

 

AREA FORECAST:

==============

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

WIND : E to SE 10 to 20, becoming SW 10 in the extreme north-east by

end of the period.

VIS : Good.

 

ANGOLA (06S/15S, 00E/WEST COAST)

WIND : S to SE 05 to 15, but SW 05 to 10 in the south-east.

VIS : Good.

 

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

WIND : E to SE 15 to 25, but W to SW 10 to 20 in the south, becoming

variable 05 in the south-west, spreading to the east by end of

the period.

VIS : Good, but moderate in showers in the extreme south by the

second half of the period.

SEA STATE: 3.0m in the north-west, subsiding by the end of the period, S

to SE swell.

 

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

WIND : S to SE 10 to 20, becoming NW 10 to 20 in the south-west by

tomorrow morning, spreading to the east by end of the period.

VIS : Good, but poor in morning fog patches in the extreme east.

SEA STATE: 3.0 to 3.5m in the extreme south, SW swell.

 

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

WIND : W to NW 15 to 25, but SW 15 to 25 from the south-west by

the evening, reaching 35 in the south-west by tomorrow

morning, becoming SE 20 to 30 in the north-west by end of the

period.

VIS : Moderate in showers in places, moderating from the south by

the end of the period.

SEA STATE: 6.0 to 4.0m, S to SW swell.

 

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

WIND : W to NW 15 to 25, reaching 35 in the south-east, becoming SW

20 to 30 in the south-west by tomorrow afternoon, spreading to

the east by end of the period.

VIS : Good, but moderate in showers in the west, spreading to the

east by end of the period.

SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m in the south-east, SW swell.

 

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

WIND : NW 20 to 30, reaching 35 in the east, but SW 20 to 30,

reaching 35 in the west, spreading to the east by end of

the period.

VIS : Good, but moderate in showers in the west, spreading to the

east by end of the period.

SEA STATE: 3.0 to 4.0m, reaching 6.0 to 8.0m in the extreme west,

spreading to the central parts by end of the period, SW swell.

 

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

WIND : NE 15 to 25 in the east, otherwise NW 15 to 25, reaching 35 in

the extreme-west at first, becoming SW 10 to 20 in the south-

west overnight.

VIS : Good, moderate in showers in places in the south-west.

SEA STATE: 3.0 to 4.0m in the south-west during the first half of the

period, NW over the central parts, otherwise SW swell.

 

MOZAMBIQUE CHANNEL

WIND : SE 10 to 15 in the north, otherwise NE 15 to 25.

VIS : Good, but moderate in showers in the extreme north.

 

MADAGASCAR EAST:

WIND : E to NE 10 to 20 in the south, otherwise SE 15 to 25.

VIS : Good, but moderate in showers in places.

SEA STATE: 3.0m in the extreme south-west at first, spreading to the

extreme south-east, SW swell.

VIS : 3.0m in the extreme east, E swell.

 

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

WIND : N to NW 20 to 30, reaching 35 to 40, but W 25 to 35 in the

west, spreading to the east by end of the period.

VIS : Good, but moderate in the west spreading to the east by end of

the period.

SEA STATE: 3.0 to 4.0m, reaching 6.0 to 7.0m, becoming 8.0 to 9.0m in the

south-west overnight, W to SW swell.

 

AREA 2:

=======

MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)

 

DATE: 15/08/13 at 0500UTC

 

AVERAGED WIND SPEED ON BEAUFORT SCALE. (Wind gusts may be about 40% stronger than the averages given here.).

 

PART 1: WARNING:

- Locally Gale force 8 over CRO.

 

PART 2: GENERAL SYNOPSYS, 15/08/13 at 0000 UTC:

- High 1034 hPa near 34S/65E, moving Eastward slowly.

- Cold front axis: 28S/47E, 32S/49E, 34S/47E moving South-Eastward 20/25kt.

 

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PART 3: FORECAST FOR 24 HOURS FROM 15/08/13 AT 0600 UTC TO 15/08/14 AT 0600UTC:

 

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

Squalls over North-Western moving South-Eastward, Scattered showers elsewhere.

 

WIND : Anticlockwise 3/5, setting-up North to North-East 4/6 by Western.

SEA : Moderate to rough and moderate South-West swell.

VISI : Poor under precipitations.

 

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

Scattered Showers.

 

WIND : Anticlockwise 3 to 5 with South-East 4/6 over Eastern at beginning of period.

SEA : Moderate to rough by moderate South-West swell.

VISI : Good.

 

 

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

Showers over North-Eastern and frontal rain or snow over South-Western at end.

 

WIND : West to North-West 5/6 setting-up North 5/7 by Western locally 8 over South-Western.

SEA : Rough to very rough. Moderate Westerly swell but heavy over Southern.

VISI : Poor in precipitations.

 

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

Showers.

 

WIND : West to South-West 5/7 becoming Anticlockwise 3/4 then Northerly 5/7 over Western at end.

SEA : Moderate to rough, very rough by moderate to heavy Westerly swell.

VISI : Poor in precipitations.