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CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST

From http://chamonix-meteo.com

ISSUED AT 07:55 FRIDAY JULY 20

GENERAL SYNOPSIS

HEAVY THUNDERSTORM LIKELY. Loose gradient with median pressure area over Western and Central Europe. • Cold altitude thalweg, Greenland to the British Isles and further to the Bay of Biscaye, shaping a humid and unstable southwesterly stream, Gibraltar to Western Alps. Low system currently isolating from the southern part of the thalweg over Central‑Western France, which will move northeast, driving a thundery cold front likely to triggering fairly heavy thunderstorm over our Region in the evening and overnight. • Sultry atmosphere with thunderstorm still likely on Saturday, then becoming changeable and cooler with scarce shower on Sunday. Probably improving as of Monday.

TODAY - FRIDAY JULY 20

Fairly sunny in the morning ‑ heavy thundery deterioration in the afternoon

SKY CONDITION : clear to partly cloudy in the morning ‑ thin high cloud from the southwest ‑ cloudy with sunny spells, then mostly cloudy in the afternoon. Period of sunshine close to 60%.
PRECIPITATION : thundery showers or thunderstorm likely from the middle of the afternoon, locally fairly heavy in the evening ‑ rain‑snow limit towards 3600 m, dropping.
WIND - ground level : calm ‑> SW light to moderate ‑> light ‑ thunderstorm gusts later.
TEMPERATURE : low +10°C - high +28°C.
ISOTHERM 0°C : 3800 ‑> 3900 m.
ROAD CONDITION  : snow showers whitening roadways above 1300 m. (Thu. 06:30).

OVERNIGHT

Bad weather ‑ locally heavy thunderstorm ‑ wind gusts

SKY CONDITION : mostly cloudy to overcast.
PRECIPITATION : active thundery cells running over from the southwest will trigger locally heavy precipitation ‑ second wave of thunderstorm likely towards the end of the night ‑ rain‑snow limit towards 3500 m, dropping towards 3200 m.
WIND - aloft : SW moderate ‑> WSW light to moderate ‑ possible thunderstorm gusts in the valley.
TEMPERATURE : low +12°C.

SATURDAY JULY 21

Often mainly cloudy ‑ frequent thundery showers ‑ getting cooler

SKY CONDITION : mostly cloudy to overcast ‑ fleeting sunny spells likely towards the middle of the day. Period of sunshine close to 20%.
PRECIPITATION : heavy thunderstorm likely early in the morning ‑ then, frequent thundery showers, yet somewhat lighter ‑ rain‑snow limit towards 3300‑3200 m.
WIND - aloft : WSW light to moderate.
TEMPERATURE : low +12 °C - high +20°C.

SUNDAY JULY 22

Cloudy ‑ unseasonably cool ‑ afternoon shower risk

SKY CONDITION : mostly cloudy to cloudy with sunny spells. Period of sunshine close to 45%.
PRECIPITATION : shower risk, mostly in the afternoon ‑ rain‑snow limit towards 3400 m.
WIND - aloft : variable light ‑> NE light to moderate.
TEMPERATURE : rising highs.

EXTENDED OUTLOOK UNTIL WEDNESDAY JULY 25 2018

Monday : fairly sunny in the morning ‑ hot with cumulus cloud over the massifs in the afternoon. Tuesday : fairly sunny ‑ hot in the afternoon. Wednesday : slightly cooler, yet unstable ‑ cloudy with sunny spells in the morning ‑ mostly cloudy with thundery shower risk later.