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CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST

From http://chamonix-meteo.com

ISSUED AT 08:05 WEDNESDAY MAY 22

GENERAL SYNOPSIS

Tiny mobile high pressure area 1021 hpa towards Channel Entrance, drifting over Southern Germany while weakening by Thursday noon. In the mean time, African originated altitude high ridge will be drifting east as well, Bay of Biscaye to Northern Alps. • Enjoyable weather therefore this Wednesday and still on Thursday, fairly sunny and getting gradually milder. • Further outlook is uncertain : fairly shallow polar air thalweg crossing over France eastward bound, Friday afternoon to Sunday morning, will cause increasing instability. Thus, cloudy deterioration is expected on Friday and during the night to Saturday, then some showers on Saturday, more frequent and possibly thundery in the afternoon. • Improving partly sunny on Sunday.

TODAY - WEDNESDAY MAY 22

Fairly sunny ‑ almost warm in the afternoon with cumulus cloud over the slopes

SKY CONDITION : clear or partly cloudy in the morning ‑ cumulus cloud over the slopes in the afternoon ‑ thin high cloud patches from northwest all over the day. Period of sunshine close to 75%.
PRECIPITATION : none.
WIND - ground level : NE light ‑> calm ‑ thermal SW light to moderate at times early in the afternoon.
TEMPERATURE : low +3°C - high +18°C.
ISOTHERM 0°C : 2800 ‑> 2700 ‑> 2900 m.
ROAD CONDITION  : recent snow shower. Locally whitened roadways. (Sun. 06:15).

OVERNIGHT

Skies clearing ‑ cold in the valley by dawn

SKY CONDITION : partly cloudy after evening cumulus cloud dispelling ‑ thin high cloud passings ‑ clear thereafter.
PRECIPITATION : none.
WIND - aloft : NNW ‑> NNE light to moderate.
TEMPERATURE : low +3°C.

THURSDAY MAY 23

Generously sunny ‑ cool in the morning ‑ warm in the afternoon

SKY CONDITION : clear or partly cloudy ‑ cumulus cloud over the massifs in the afternoon. Period of sunshine close to 85%.
PRECIPITATION : none.
WIND - aloft : NNE light to moderate ‑> variable ‑> NNW light.
TEMPERATURE : low +2 °C - high +19°C - temperature inversion toward 1300 m early in the morning.

FRIDAY MAY 24

Becoming unstable ‑ cloudy deterioration, yet warm in the afternoon

SKY CONDITION : partly cloudy to cloudy with sunny spells until the middle of the afternoon ‑ becoming mostly cloudy from southwest thereafter. Period of sunshine close to 50%.
PRECIPITATION : none.
WIND - aloft : SW light ‑ S very light at times.
TEMPERATURE : rising.

EXTENDED OUTLOOK UNTIL MONDAY MAY 27 2019

Saturday : increasing instability ‑ some sunny spells early in the morning ‑ unsettled spell triggering locally thundery shower in the afternoon and noticeable temperature drop. Sunday : partly sunny ‑ dry. Monday : diurnal instability ‑ fairly sunny and cool in the morning ‑ locally cloudy due to cumulus cloud growth in the afternoon ‑ seasonable temperatures.