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CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST

From http://chamonix-meteo.com

ISSUED AT 07:55 MONDAY MAY 21

GENERAL SYNOPSIS

High 1028 hpa, Southern Sweden, lining up Russia to Northern Balkans by Tuesday. Lower pressure field with loose gradient over the Southern European, Alpine Range included, and the Mediterranean. • Light southerly to southeasterly stream over the Western Alps, driving mediterranean humidity waves in an already fairly unstable air mass, yet with a light fœhn effect along the northern slopes this Monday morning. This configuration, reinforced by the vicinity of two altitude minima, Western France and Eastern Balearic Islands, will somewhat increase afternoon thundery shower risk. • Same kind of weather expected to persisting until the end of the week, with a fluctuating level of instability which must be guessed from day to day.

TODAY - MONDAY MAY 21

Changeable, fœhn trend ‑ some sunny spells ‑ afternoon shower risk

SKY CONDITION : cloudy with sunny spells ‑ mostly cloudy at times, especially in the afternoon. Period of sunshine close to 45%.
PRECIPITATION : shower risk, somewhat higher in the afternoon ‑ rain‑snow limit towards 2700 m.
WIND - ground level : light NE fœhn ‑> variable light ‑> calm.
TEMPERATURE : low +7°C - high +20°C.
ISOTHERM 0°C : 2800 ‑> 3000 m.
ROAD CONDITION  : snow showers whitening roadways above 1300 m. (Thu. 06:30).

OVERNIGHT

Changeable, probably without precipitation ‑ rather mild in the valley

SKY CONDITION : Cloudy with clear spells ‑ mostly cloudy at times.
PRECIPITATION : probably none.
WIND - aloft : SSE ‑> SE light ‑ light to moderate at times.
TEMPERATURE : low +6°C.

TUESDAY MAY 22

Cloudy ‑ scarce sunny spells ‑ thundery trend, more pronounced in the afternoon

SKY CONDITION : cloudy to mostly cloudy ‑ some sunny spells in the morning. Period of sunshine close to 35%.
PRECIPITATION : thundery shower or thunderstorm running back from the east in the afternoon ‑ rain‑snow limit towards 2800 m.
WIND - aloft : SE ‑> NE light.
TEMPERATURE : low +6 °C - high +19°C.

WEDNESDAY MAY 23

Partly sunny ‑ thundery shower risk, higher in the afternoon

SKY CONDITION : cloudy to mostly cloudy ‑ sunny spells in the morning. Period of sunshine close to 40%.
PRECIPITATION : isolated thundery shower in the afternoon ‑ rain‑snow limit towards 2900 m.
WIND - aloft : SW light ‑ light to moderate at times.
TEMPERATURE : dropping slightly.

EXTENDED OUTLOOK UNTIL SATURDAY MAY 26 2018

Thursday : fairly sunny ‑ no precipitation. Friday : fairly sunny ‑ late afternoon shower slight risk. Saturday and Sunday : fairly sunny ‑ diurnal instability will increase slightly ‑ afternoon shower risk.