Marine Weather for HS 015

Forecast
weather bulletin for the high seas for Metarea VII.East of 20e. Issued by the South African Weather Service on the 28th of may 2017 at 17:30 UTC.

For southeast 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 281000 to 291000 utc:

Wind in knots, wave heights in meters. No sea state given if waves less than 3m.

Gale warnings: ============== 1. Marion forties east: N to NW 20 to 30, becoming W to SW 35 in the south from the afternoon.

Synoptic situation at 12:00z ============================= high 1030 hpa 35s15e. Low 986 hpa 50s03w low 944 hpa 60s11e low 1014 hpa 33s49e low 980 55s55e.

1. Cold front: 33s20w 40s06w 45s03e 50s10e 55s15e into 60s11e 2. Cold front: 41s53e 45s57e 50s60e into 55s55e.

Area forecast: ============== cape east (32.5s/40s, 20e/35e). Wind : W to SW 15 to 25, becoming NW 10 to 20 in the extreme west in the evening. It will become NE 15 to 25. Vis : moderate with showers and thundershowers in the east. Sea state: 3.0 to 4.0m, mainly SW swell.

Durban east (25s/32.5s, East Coast/55e) wind : NW 15 to 25 in the east at first, otherwise S to se 15 to 25. Vis : moderate in showers in places. Sea state: 3.0 to 3.5m in the south-east and in the west, mainly SW swell.

Mozambique channel: wind : variable 05, but SW 10 to 20 in the south by the end of the period. Vis : good, but moderate in showers in the south. Sea state: 3.0m in the south, SW swell.

Madagascar east: wind : se 10 to 20, but N to NE 10 to 20 in the extreme south. Vis : good, but moderate in showers and thundershowers in the East.

Marion forties east: (40s/50s, 35e/50e) wind : N to NW 20 to 30, becoming W to SW 20 to 30 reaching 35 in the south from the afternoon. Vis : moderate in showers and rain except in the North. Sea state: 3.5 to 4.5m reaching 5.0 to 6.0m in the south, SW swell.

Area 2: ======= marine meteorological bulletin from Meteo-France/La Reunion on area ack (amsterdam-Crozet-kerguelen)

Date: 17/05/28 at 1700 UTC

Averaged wind speed on Beaufort scale. (Wind gusts may be stronger than averages given here).

Part 1: warning : strong gale force 9 over ker

- gale force 8 over cro

Part 2: general synopsys, 17/05/28 a 1200 UTC :

- low 984 hpa near 44s/80e, rapidly moving eastward.

- Low 978hpa near 54s/53e, rapidly moving eastward. Associated cold front cf 50s/58e, 45s/56e, 40s/54e.

- New low near 60s/43e at end, with associated front cg reaching southern cro.

Part 3: forecast for 24 hours from 17/05/28 at 1800 UTC to 17/05/29 at 1800 UTC :

Wam (30s/40s,50e/65e) :frequent showers and squalls.

Wind: variable mainly westerly 3 to 5, locally 5 or 6 with gusts in south.

Sea: moderate to rough from north to south, locally very rough in far south. Moderate SW swell.

Visi: poor in precipitations.

Ams (30s/40s,65e/80e) :showers, then frontal rain and showers cf from west later.

Wind: in north : clockwise 3 to 5, increasing westerly 4 to 6 later.

- In south : westerly 4 to 6, but locally 6 or 7 with gusts near cf.

Sea: rough to very rough temporarily high in southeast at first. Heavy SW swell, abating moderate.

Visi: poor in precipitations.

Cro (40s/50s,50e/65e) :frontals rain, showers and snow cf, then cg at end.

Wind: northwest 6 or 7 in east ahead cf, backing west or southwest behind front at first, then increasing westerly 7 or 8 at end. Gusts.

Sea: very rough, at times high. Westerly moderate or heavy swell.

Visi: poor in precipitations.

Ker (40s/50s,65e/80e) :showers, then frontal rain, showers and snow cf.

Wind: southwest 7 or 8 in northeast at first, but westerly 4 to 6 elsewhere, increasing westerly 7 or 8 from west soon, but locally clockwise 8 at times 9 in southeast later. Severe gusts.

Sea: very rough, at times high. Moderate to heavy westerly swell.

Visi: poor in precipitations.

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