CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST

ISSUED AT 08:57 SATURDAY NOVEMBER 19 2011
PÉRIODE DU SAMEDI 19 AU JEUDI 24 NOVEMBRE 2011


GENERAL SYNOPSIS
Atlantic thalweg, far west of Ireland to far west of Portugal, stationary. Extended high covering Central Europe, focused towards 1025 hpa over Northern Balkans, weakening slightly, then drifting northeast from Sunday.

Light southerly to southwesterly stream over the Alps. Which weak high pattern is expected to persisting until Monday. Disturbances following each other eastwards over the Mediterranean, marginally affecting the Northern Alps. Further outlook is very uncertain.
TODAY – SAMEDI 19 NOVEMBRE
Sunny – cold in the morning
SKY CONDITION : clear or partly cloudy – high cloud crossing over from the southwest, thicker in the afternoon.

SKY CONDITION period of sunshine close to 80%.

PRECIPITATION : none.

WIND – ground level : variable light.

WIND – mid mountain : SE light.

WIND – high mountain : SSW light to moderate -> light.

TEMPERATURE : low -6°C – high +10°C – temperature inversion toward 1400 m.

ISOTHERM 0°C : 2500 m.

ISOTHERM -10°C : 4300 m.

OVERNIGHT
Cloudy at times – not as cold as previously
SKY CONDITION (cloud) : cloudy in the first part of the night – high cloud crossing over, fairly thick at first – becoming partly cloudy.

PRECIPITATION : none.

WIND – aloft : SW light.

TEMPERATURE : low -3°C.

SUNDAY NOVEMBER 20
Fairly sunny – cold in the morning – milder in the afternoon
SKY CONDITION : clear or partly cloudy – high cloud crossing over, fairly thick at times in the morning

SKY CONDITION period of sunshine close to 85%.

PRECIPITATION : none.

WIND – aloft : SW -> W light.

TEMPERATURE : low +11 °C – high +11°C.

MONDAY NOVEMBER 21
Sunny – cold in the morning – milder in the afternoon
SKY CONDITION : clear or partly cloudy – thin high cloud crossing over

SKY CONDITION period of sunshine close to 90%.

PRECIPITATION : none.

WIND – aloft : S faible.

TEMPERATURE : steady.

EXTENDED OUTLOOK UNTIL THURSDAY NOVEMBER 24 2011

Tuesday and Wednesday : fairly sunny – high cloud crossing over, fairly thick at times – dry. Thursday : sunny with light N wind – cold – very uncertain.

Forecast reliability : fairly good until Monday – poor thereafter.

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