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 23rd February 2017 at 08:30 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 231000 to 241000 utc:

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

Gale warnings: ============== nil.

Synoptic situation at 06:00z ============================= high 1022 hpa 34s22w high 1022 hpa 40s35e low 986 hpa 59s32e low 976 hpa 60s15e low hpa 1012 3044e.

1. Cold front: 50s29e 55s36e into 59s32e into 60s15e

Area forecast: ============== cape east (32.5s/40s, 20e/35e). Wind : E to NE 15 to 25 in the west, otherwise se 15 to 25, reaching 30 in places over the North-East. Vis : good, but moderate in showers and rain in places, except the north-west, but poor in places in the North-East. Sea state: 3.0m in places over the central northern parts, subsiding, mainly SW swell.

Durban east (25s/32.5s, East Coast/55e) wind : E to se 15 to 25 in the west, but N to NE 10 to 20 but NW 10 in the South West. Vis : moderate to poor in showers and rain. Sea state: 3.0m in the South-West, mainly E to se swell.

Mozambique channel: wind : N to NW 10 in the north, otherwise variable 05. Vis : moderate in showers and thundershowers in places.

Madagascar east: wind : se 05 to 15 in the extreme north-west, otherwise E to NE 10 to 20. Vis : moderate in showers in places.

Marion forties east: (40s/50s, 35e/50e) wind : NW 15 to 25 but SW 10 in the north west. Vis : good, but moderate in showers and rain in the South West.

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

Date: 17/02/23 at 0500utc

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 synopsys, 17/02/23 at 0000 UTC : - low pressure area 990 hpa between 51s/67e and 49s/79e, quickly moving eastward and deepening. - Cold front axis : 38s/48e, 42s/65e, 40s/81e, 44s/88e, 52s/85e, with before convective area over south of ams, crossing area. - Convective area axis 32s/42e, 35s/45e, 37s/49e crossing wam over period. - Filling high 1025 hpa near 33s/95e, associated ridge extending to 60e. - New ridge high reaching west of area over cro.

Part 3: forecast for 24 hours from 17/02/23 at 0600 UTC to 17/02/24 at 0600utc :

Wam (30s/40s,50e/65e) : squalls and showers. Wind: temporarily northwest 4/6 over northwestern area to before convection, then becoming variable 2 to 4 from west, locally increasing southeast 4/6 in southern at behind convection. Sea : moderate. Visi: very poor in squalls.

Ams (30s/40s,65e/80e) :showers and squalls mainly over southern. Wind: mainly northwest 4 to 6, soon backing southwest 3 to 5 in south, behind convective area. Gusts in convective area. Sea : moderate, at times rough in south. Visi: very poor in squalls.

Cro (40s/50s,50e/65e) :showers, clearing from eastern. Wind: south-westerly 5 or 6, at times 7, decreasing and becoming anticlockwise 3 to 5 at over western area but west 5/6 over southern area. Sea : moderate to rough. Moderate W to SW swell. Visi: poor in precipitations then good

Ker (40s/50s,65e/80e) :showers over southern area. Wind: southwesterly 5/7 with gusts. Sea : moderate to rough. W to SW swell increasing moderate at end. Visi: poor in precipitations

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