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CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST

From http://chamonix-meteo.com

ISSUED AT 08:05 MONDAY SEPTEMBER 24

GENERAL SYNOPSIS

COOLER, YET NOT THAT MUCH. Last night’s disturbance is moving away over Italy, then the Northern Balkans, linked to a thalweg which is currently extending, Spitzberg to Central Europe. Powerful high, 1040 hpa, inflating over Southwestern Ireland, linked to an altitude high pressure component over Iberia. Strong northwest high up, this Monday morning, between those areas of action. • This flow will however decrease soon, as the Irish High will drift towards Northern France by Tuesday noon. Resuming fair weather will be fairly cool, then gradually milder over the days until Thursday.

TODAY - MONDAY SEPTEMBER 24

Sunny after early morning cloud dispelling ‑ decreasing wind high up

SKY CONDITION : low cloud up towards 2000 m, breaking and turning into cumulus cloud over the slopes ‑ becoming partly cloudy over the afternoon hours, with thin high cloud. Period of sunshine close to 70%.
PRECIPITATION : none.
WIND - ground level : variable light.
TEMPERATURE : low +10°C - high +19°C.
ISOTHERM 0°C : 3600 ‑> 4200 ‑> 3800 m.
ROAD CONDITION  : snow showers whitening roadways above 1300 m. (Thu. 06:30).

OVERNIGHT

Clearing skies ‑ chilly by dawn in the valley ‑ temperature inversion

SKY CONDITION : clear or partly cloudy after evening cumulus cloud dispelling ‑ some high cloud passings thereafter.
PRECIPITATION : none.
WIND - aloft : NW moderate ‑> NNW light to moderate.
TEMPERATURE : low +5°C - temperature inversion toward 1500 m.

TUESDAY SEPTEMBER 25

Sunny ‑ chilly morning in the valley ‑ getting warm in the afternoon

SKY CONDITION : clear or partly cloudy ‑ some cumulus cloud over the massifs later. Period of sunshine close to 90%.
PRECIPITATION : none.
WIND - aloft : NNW ‑> N light to moderate.
TEMPERATURE : low +4 °C - high +20°C - temperature inversion toward 1200 m early in the morning.

WEDNESDAY SEPTEMBER 26

Fair weather ‑ cold by dawn ‑ warm in the afternoon

SKY CONDITION : clear or partly cloudy. Period of sunshine close to 95%.
PRECIPITATION : none.
WIND - aloft : N ‑> variable light.
TEMPERATURE : rising highs.

EXTENDED OUTLOOK UNTIL SATURDAY SEPTEMBER 29 2018

Thursday and Friday : amazingly fair weather ‑ almost cold early in the morning ‑ warm in the afternoon. Saturday and Sunday : sunny ‑ polar air income high up will however make temperature highs drop noticeably. • Sunny weather expected to persisting during the following week with seasonable temperatures.