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Weather Forecast

Thursday 20th of November 2008

GENERAL SYNOPSIS
High 1041 hpa, far west of Ireland, almost stationary. Low 983 hpa, Southern Norway, drifting east while deepening. Linked cold front, very active, is expected to reaching the Alps by Friday, ahead of an extended unsettled and humid polar air income

TODAY - THURSDAY NOVEMBER 20 2008
Fairly sunny - disturbance approaching towards the evening
SKY CONDITIONS (cloud - sunshine) : clear or partly cloudy - high cloud crossing over at times - becoming cloudy from the northwest towards the evening - period of sunshine close to 80%.
PRECIPITATION : none.
WIND  - ground level : variable light.
- mid mountain : WNW very light.
- high mountain : NNW -> NW moderate.
TEMPERATURE : min 0°C - max +7°C - morning inversion towards 1600 m.
ISOTHERM 0°C :  2300 -> 2900 m.
ISOTHERM -10°C :  3900 -> 4500 m.

OVERNIGHT
Cloudy - becoming overcast
SKY CONDITIONS (cloud) : cloudy at first - becoming mostly cloudy - overcast towards the end of the night.
PRECIPITATION : none.
WIND  - aloft : NW moderate -> strong.
TEMPERATURE : +2°C.

TOMORROW - FRIDAY NOVEMBER 21
Overcast - rain in the morning - snow in the afternoon - NW gale high up
SKY CONDITIONS (cloud - sunshine) : overcast - period of sunshine close to 0%.
PRECIPITATION : starting up in the morning - becoming moderate in the afternoon - locally heavy towards the evening - rain-snow limit towards 1300 m in the morning, dropping towards 600 m at night - expected snowfall towards 1500 m : 25-35 cm
WIND  - aloft : NW strong -> gale force.
TEMPERATURE :  min 0°C - max +2°C.

SATURDAY NOVEMBER 22
Mainly cloudy - snowy - cold - gale high up
SKY CONDITIONS (cloud - sunshine) : overcast or mostly cloudy - period of sunshine close to 0%.
PRECIPITATION : frequent showers - rain-snow limit < 400 m - expected snowfall towards 1500 m : 20-30 cm.
WIND  - aloft : NW gale -> N moderate to strong.
TEMPERATURE :  dropping sharply.

EXTENDED OUTLOOK UNTIL TUESDAY NOVEMBER 25 2008
Sunday : scattered snow showers - very cold - possible fleeting sunny spells. Monday : overcast - slightly milder - frequent snow showers - becoming scattered towards the evening. Tuesday : very cold - sunny spells likely - outlook is uncertain.
Forecast reliability : fairly good until Sunday - poor thereafter.
Reports
Chamonix-ville
45.9 N 6.9 E - Altitude 1042 m
20 November 07:00
Temperature 0 °C
Relative humidity 98 %
Wind 0 km/h
Pressure 1024 hpa - steady
Pressure at 1042 m 903 mb
Precipitation last 6h 0.0 mm
Low cloud
Skies cloudy
Visibility 40000 m
 Aiguille du Midi
Altitude 3845 m
20 November 07:00
Temperature -9 °C
Wind NNW 25 km/h
Relative humidity %
 Le Lac Blanc
Altitude 2330 m
20 November 07:00
Snow depth 5 cm
Wind 10 km/h
Gusts -- km/h
Temperature -1 °C
Relative humidity -- %


w w w . c h a m o n i x - w e a t h e r . c o m
Chamonix Valley and Mont-Blanc area weather information service

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