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weather bulletin for the high seas for Metarea VII, east 20e.
Issued by the South African Weather Service on the
20th of November 2009 at 18:00 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:
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forecast valid from 202200 to 212200 UTC.
Wind in knots, wave heights in metres. 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 warning(s):
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1. Tristan: NW 35 in southwest becoming W to SW 35 to 40.
2. Cape east: NE 35 in northwest at first
3. Durban east: NE 35 in the South-West at first.
Synoptic situation at 12:00 UTC
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high 1026 hpa 30s05w high 1034 hpa 37s37e
low 996 hpa 50s01w low 1008 hpa 37s17w low 958 hpa 64s36e
low 958 hpa 65s18e low 994 hpa 47s73e
1. Cold front: 42s10e 45s16e 50s24e 55s27e 60s38e 64s36e 65s18e
Area forecast:
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Cape east (32.5s/40s, 20e/50e)
wind : NE to N 15 to 25 reaching NE 30 to 35 in northwest at first but variable 5 to 15 in the east becoming W 10 to 20 in west.
Vis : moderate in showers in extreme southwest.
Sea state: 2.5 to 3.5m reaching 4m in the east and west, with mainly S to SW
swell.
Durban east (25s/32.5s, East Coast/55e)
wind : se to NE 15 to 25 reaching 30 south of Madagascar and NE 30 to 35 in the South-West at first.
Vis : good but poor in rain and showers in the northeast and southwest
at first.
Sea state: 3.0 to 4.0m reaching 5.0m in the southeast, mainly S swell.
Mozambique channel:
wind : se to E 10 to 20 reaching se 25 to 30 in the south but variable 5 to 10 in central and northern parts.
Vis : moderate in showers and thundershowers in places.
Sea state: 3.0 to 4.5m in the south, with SSW swell.
Madagascar east:
wind : se 15 to 20 reaching 25 in places.
Vis : moderate to poor in rain and showers in places.
Sea state: 3.0 to 4.0m in south, with mainly SSW swell.
Marion forties east: (40s/50s, 35e/50e)
wind : NW to W 10 to 20 reaching 25 in south, becoming N 25 to 30 in west.
Vis : good, but moderate in showers in the south and west.
Sea state: 3.0 to 4.0m in south becoming 5.0m later, with SW swell.
Area 2:
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Marine meteorological bulletin from Meteo-France/La Reunion on area
ack (amsterdam-Crozet-kerguelen)
Date : 09/11/20 UTC time : 1630
Averaged wind speed on Beaufort scale
wind gusts may be about 40% stronger than the averages given here.
Part 1:
Storm Warning : nil.
Part 2:
general synopsis, 09/11/20 at 1200 UTC :
- high 1033 hpa near 37s/37e, moving easward 10/15 kt.
- Cold front cg axis : 28s/55e, 35s/65e, 40s/68e, 48s/73e with warm
front wg axis : 48s/73e, 51s/77e, 51s/87e ; associated low 995 hpa
near 47s/71e, deepening ; moving eastsoutheastward 20/25 kt.
- Frontolysis cold front ch axis : 47s/37e, 51s/45e, 55e/52e,
moving eastnortheastward 25/30 kt.
Part 3:
forecast for 24 hours from 09/11/20 at 1800 UTC to 09/11/21 at
1800 UTC :
wam (30s/40s,50e/65e) : frontal rain in cg at biginning, then
showers and squalls.
Wind : southwesterly 5/6, reaching locally 7 ; becoming
anticlockwise 3 to 5 over northwestern area.
Sea : rough to very rough. Moderate S-W swell.
Visi : poor in rain, showers and squalls.
Ams (30s/40s,65e/80e) : rain and showers cg then showers and
squalls .
Wind : N-W 5/6 ahead the front, reaching 7 in the front, backing
southwesterly 5/6, to locally 7, behind.
Sea : moderate to rough, becoming rough to very rough. Arrival of a
moderate S-W swell.
Visi : poor in rain, showers and squalls.
Cro (40s/50s,50e/65e) : showers and squalls at biginning then
showers in ch.
Wind : southwesterly 5/6, to locally 7.
Sea : rough, to locally very rough. Arrival of a moderate S-W swell.
Visi : poor in squalls and showers.
Ker (40s/50s,65e/80e) : rain and showers in cg then showers and
squalls.
Wind : N-W 6/7 ahead the front, backing southwesterly 4/5 then 5/6
behind.
Sea : rough. Moderate N-W swell, decreasing.
Visi : poor in rain, showers and squalls.=
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