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CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST ISSUED AT 08:40 FRIDAY DECEMBER 30 2011

December 30th, 2011

One for the scrapbook….

CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST

ISSUED AT 08:40 FRIDAY DECEMBER 30 2011
VALID FROM : FRIDAY DECEMBER 30 2011
UNTIL : WEDNESDAY JANUARY 04 2012

GENERAL SYNOPSIS

High 1041 hpa, west of Portugal, weakening. Low 978 hpa, south of Finland, moving north. Humid and very unsettled polar air flow in-between, with barrier effect against the Northern Alps today, producing heavy precipitation and severe gale force wind high up. The unsettled train is keeping on to crossing over the area with a warm front coming in from the west by Saturday, causing the rain-snow limit to gradually rise up towards 1600 m.

TODAY – FRIDAY DECEMBER 30 2011

Snow – gale high up

SKY CONDITION : overcast or mostly cloudy. Period of sunshine close to 0%.

PRECIPITATION : continuous – moderate to heavy in the morning – light in the afternoon – rain-snow limit towards 600 m – expected snowfall towards 1000 m : 30-40 cm.

WIND - ground level : variable light.

WIND - mid mountain : NW moderate – moderate to strong at times.

WIND - high mountain : NNW severe gale.

TEMPERATURE : low -4°C - high -2°C.

ISOTHERM 0°C : 800 -> 1000 m.

ISOTHERM -10°C : 2400 -> 2600 m.

OVERNIGHT

Getting milder – snow, changing to rain towards dawn

SKY CONDITION : mostly cloudy to overcast.

PRECIPITATION : light at first – getting heavier later – rain-snow limit rising up towards 1100 m – expected snowfall towards 1200 m : 10-20 cm.

WIND - aloft : NNW gale -> NW strong.

TEMPERATURE : low -2°C.

SATURDAY DECEMBER 31

Warm front crossing over – moderate to heavy precipitation in the morning

SKY CONDITION : overcast or mostly cloudy. Period of sunshine close to 0%.

PRECIPITATION : moderate to heavy in the morning – lighter in the afternoon – rain-snow limit between 1100 and 1700 m – expected snowfall towards 2000 m : 50-70 cm.

WIND - aloft : NW strong -> moderate to strong.

TEMPERATURE : low +1 °C - high +1°C.

SUNDAY JANUARY 01

Unsettled and milder than seasonal average – improving in the afternoon

SKY CONDITION : mostly cloudy in the morning – becoming cloudy with sunny spells in the afternoon. Period of sunshine close to 40%.

PRECIPITATION : scattered showers in the morning – rain-snow limit towards 1600 m – dry in the afternoon.

WIND - aloft : WNW light to moderate -> WSW moderate.

TEMPERATURE : rising slightly.

EXTENDED OUTLOOK UNTIL WEDNESDAY JANUARY 04 2012

Monday : cold front crossing over – heavy snow at times. Tuesday : improving – possible showers in the morning – sunny spells later. Wednesday : weak disturbance possibly crossing over in the morning – improving later. Outlook is uncertain.

Forecast reliability : fairly good until Saturday – poor thereafter.

The first snow of winter 2011-2012 falls in Chamonix

October 8th, 2011

The first snow fall of the 2011-2012 winter in the alps

Keywords snow, Video, youtube

Today's Weather

Full Forecast

TODAY - THURSDAY MAY 17 2012 Sunny - cold in the morning - mild in the afternoon SKY CONDITION : clear or partly cloudy - thickening high cloud from the west during the afternoon. Period of sunshine close to 85%. PRECIPITATION : none. WIND - ground level : variable light - light to moderate afternoon thermal breeze. WIND - mid mountain : variable -> S light. WIND - high mountain : NW moderate to strong -> W light to moderate. TEMPERATURE : low -2 C - high +17 C - temperature inversion toward 1500 m. ISOTHERM 0 C : 2400 -> 3300 m. ISOTHERM -10 C : 3900 -> 4700 m.