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CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST

From http://chamonix-meteo.com

ISSUED AT 08:30 WEDNESDAY NOVEMBER 21

GENERAL SYNOPSIS

Extended low area close to 1005 hpa, Bay of Biscaye, France, Northern Iberian, Western Mediterranean, the whole being in a drifting trend towards north‑northwest. Linked altitude cold drop over Southwestern England, drifting slowly northwest. This complex system drives moderate unsettled south to southwest stream over Western Alps, going along with some remaining fœhn puffs early in the morning. Light precipitation likely early in the afternoon, then gradually improving towards the evening. • Dry and mild weather likely thereafter until Thursday evening, then fœhn resuming on Friday, preceding disturbance passing during the following night.

TODAY - WEDNESDAY NOVEMBER 21

Mainly cloudy ‑ getting further milder ‑ fleeting sunny spells in the afternoon

SKY CONDITION : some fœhn generated hazy sunny likely likely early in the morning, mostly eastward, then mostly cloudy until the middle of the afternoon ‑ cloud running over from the south ‑ relative improvement with fleeting sunny spells later. Period of sunshine close to 20%.
PRECIPITATION : slight risk early in the afternoon, light and scattered ‑ rain‑snow limit towards 1300 m, rising.
WIND - ground level : NE light with fœhn puffs ‑> variable light ‑> calm.
TEMPERATURE : low +2°C - high +6°C.
ISOTHERM 0°C : 1700 ‑> 2100 m.
ROAD CONDITION  : mostly bare roadways. Melted waters re-freezing risk (Tue. 20:00).

OVERNIGHT

Clear spells spreading ‑ cold in the valley ‑ milder in the median altitude range

SKY CONDITION : clear spells spreading ‑ becoming partly cloudy before dawn.
PRECIPITATION : none.
WIND - aloft : SW light ‑> light to moderate.
TEMPERATURE : low ‑2°C - temperature inversion toward 1500 m.

THURSDAY NOVEMBER 22

Pleasing autumnal condition ‑ sunny ‑ mild in the median altitude range

SKY CONDITION : partly cloudy at first ‑ some fog patches sticking to the slopes ‑ else clear or partly cloudy. Period of sunshine close to 80%.
PRECIPITATION : none.
WIND - aloft : SW light to moderate ‑> moderate.
TEMPERATURE : low ‑3 °C - high +10°C - temperature inversion toward 1300 m early in the morning.

FRIDAY NOVEMBER 23

Cloudy, mild and dry with fœhn at first ‑ light rain later ‑ windy high up

SKY CONDITION : cloudy with fœhn generated sunny spells in the morning ‑ becoming mostly cloudy to overcast. Period of sunshine close to 25%.
PRECIPITATION : starting up in the course of the afternoon, light and scattered ‑ rain‑snow limit towards 1800 m, dropping.
WIND - aloft : SW moderate to strong ‑> moderate ‑ moderate fœhn in the valley, decreasing later.
TEMPERATURE : dropping lows ‑ rising highs.

EXTENDED OUTLOOK UNTIL MONDAY NOVEMBER 26 2018

Saturday : mainly cloudy with light rain ‑ unseasonably mild. Sunday : cooler, yet still milder than seasonable ‑ cloudy with sunny spells. Monday : very uncertain ‑ gloomy and cold ‑ light snow.