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CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST

From http://chamonix-meteo.com

ISSUED AT 07:55 SUNDAY AUGUST 25

GENERAL SYNOPSIS

High 1028 hpa over the Gulf of Finland and Western Russia. Slightly lower pressure field with loose gradient over Central and Western Continental Europe, and the Mediterranean perimeter as well. • Persistent tiny anticyclonic high over the Alpine Range, with fairly stable and dry air mass along its northern slope, and slightly more instability southward, favouring convection. Current fair summer weather will persist at least until Monday evening, with temperature highs likely to getting above 28°C in Chamonix; light altitude flow and thermal breezes in the valleys. Late afternoon thundery shower risk will become quite low on the Italian slopes as well. • Outlook is uncertain as of Tuesday.

TODAY - SUNDAY AUGUST 25

Fair summer weather, cool by dawn, hot in the afternoon

SKY CONDITION : clear or partly cloudy on the whole ‑ some very thin high cirrus cloud towards the middle of the day ‑ some cumulus cloud over the massifs in the afternoon, mostly toward Italy. Period of sunshine close to 95%.
PRECIPITATION : none.
WIND - ground level : calm ‑> light thermal SW or locally light to moderate ‑> calm.
TEMPERATURE : low +9°C - high +27°C.
ISOTHERM 0°C : 4000 ‑> 4200 m.
ROAD CONDITION  : recent snow shower. Locally whitened roadways. (Sun. 06:15).

OVERNIGHT

Fair summer night, mild in the median altitude range

SKY CONDITION : clear ‑ good radiation condition high up, yet with iso 0°C towards 4200 m, thus short lasting snow surface re‑freezing.
PRECIPITATION : none.
WIND - aloft : N ‑> NNW light.
TEMPERATURE : low +10°C.

MONDAY AUGUST 26

Fair summer weather, cool by dawn, hot in the afternoon

SKY CONDITION : clear or partly cloudy ‑ some cumulus cloud north of the high massifs in the afternoon ‑ more with larger vertical extent over the Italian slopes. Period of sunshine close to 90%.
PRECIPITATION : none.
WIND - aloft : NNW ‑> NW light ‑ thermal slope breezes in the afternoon.
TEMPERATURE : low +9 °C - high +29°C.

TUESDAY AUGUST 27

Fairly sunny, hot in the afternoon ‑ cloud running over from south later

SKY CONDITION : clear in the morning ‑ becoming partly cloudy to locally cloudy from south over the afternoon hours. Period of sunshine close to 75%.
PRECIPITATION : probably none.
WIND - aloft : S light ‑> light to moderate.
TEMPERATURE : steady or slightly rising highs.

EXTENDED OUTLOOK UNTIL FRIDAY AUGUST 30 2019

• Tiny low system drifting Balearic Islands to Sardinia, driving unstable and humid puffs towards the Alps. • Wednesday : south to southeast, mostly light, yet very unstable ‑ thunderstorm cells growing from south in the afternoon ‑ still unseasonably hot. Thursday : cloudy to mostly cloudy, somewhat cooler ‑ sunny spells at first ‑ thundery shower getting widespread in the afternoon. Friday : changeable, less instability ‑ cloudy with sunny spells ‑ afternoon shower slight risk.