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CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST

From http://chamonix-meteo.com

ISSUED AT 18:00 ON FRIDAY JANUARY 18, 2019

GENERAL SYNOPSIS

Fairly loose pressure gradient over Western Europe on the whole, causing very light stream high up, mostly west. Mobile cut off Azores high ridge, currently 1020 hpa Rhineland, expected 1023 hpa Eastern Alps ovenight. • Light westerly flow drives somewhat humid air, thus making often cloudy skies in the first part of the night, which will be mostly clearing later. Mainly sunny while getting milder on Saturday. • Further outlook remains uncertain : tiny low coming in over the English Channel is expected to causing cloudy deterioration on Sunday. New maritime polar air income possibly setting up towards the middle of next week and reaching the Western Mediterranean.

FRIDAY EVENING JANUARY 18 - AND OVERNIGHT

Thick veiled skies, becoming partly cloudy - bitter cold by dawn

SKY CONDITION : high and median altitude cloud often thick until the middle of the night, then dispelling gradually.
PRECIPITATION : none.
WIND - ground level : calme ou variable faible.
TEMPERATURE : low -8°C.
ISOTHERM 0°C : 900 -> 1000 -> 900 m.
ROAD CONDITION  : locally snow covered roadways besides treated itineraries. (Thu 17:00).

TOMORROW - SATURDAY JANUARY 19

Sunny - bitter cold in the morning - milder on sunny slopes in the afternoon

SKY CONDITION : clear or partly cloudy. Period of sunshine close to 90%.
PRECIPITATION : none.
WIND - ground level : variable -> SW -> variable light.
TEMPERATURE : low -9°C - high 0°C.

SATURDAY TO SUNDAY NIGHT - JANUARY 19 TO 20

Cloudy at times - rather cold by dawn

SKY CONDITION  : fairly thick cloud passings from west in the first part of the night - becoming partly cloudy later.
PRECIPITATION : none.
WIND - aloft : W -> NW light.
TEMPERATURE : low -7°C.

SUNDAY JANUARY 20

Uncertain - cloudy and cold, probably without precipitation

SKY CONDITION : cloudy with some sunny spells - median altitude cloud running over from southwest. Period of sunshine close to 30%.
PRECIPITATION : probably none.
WIND - aloft : mainly W - very light.
TEMPERATURE : low -8 °C - high +1°C.

MONDAY JANUARY 21

 : cloudy in the morning, some sunny spells - becoming partly cloudy in the afternoon. Period of sunshine close to 60%.