Weather forecast bulletins

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Weather forecast Saturday, 27 August 10:00 am
27/08/2022 ; 10:21

High pressure cell 1022 hpa on the N of the British Isles, at the end of the Azores ridge, pressure increasing until Sunday.
The Alpine arc will benefit from this in the form of a regression of the instability on Saturday. At the end of this evolution, very hot weather, Sunday, 26°C at 1000 m.

Saturday, August 27 - all areas
Fair and cool at the beginning - diurnal evolution - risk of thundershowers in the afternoon
Fair to slightly cloudy this morning - locally cloudy in the afternoon due to cumulus development
Risk of thundershowers, 15:00 -18:00 - small size, little water - rain-snow limit 3300 m
Wind 1500 m : variable weak - weak thermals in the valleys, locally weak to moderate
Wind 2500 m : weak NNW - temporarily weak to moderate in the afternoon
Temperature 1000 m : minimum +9°C - maximum +23°C
Temperature 1500 m : mini +7°C - maxi +19°C
Temperature 2500 m (Grand Col Ferret) : mini +5°C - maxi +14°C

Weather forecast Friday, 26 August - 11:00 am
26/08/2022 ; 13:39

Barometric swamp over the Alps and Central Europe, in which a trough of slightly cooler and more humid air is circulating. Cooler and more humid air, and which determines a weak and very unstable SW flow that propels thunderstorms across the region. Beginning of a lull in the first part of the night.
More decisive improvement on Saturday during the day. Nice summer weather on Sunday.


Night of Friday 26 to Saturday 27 August
Outbreaks of thunderstorms until the beginning of the night. Lightening developing during the second part. Heavy showers possible under thunderstorms until around 21:00 - rain-snow limit around 3600 m
Wind 1500 m : variable very weak or calm - gust possible under thunderstorms
Wind 2500 m : calm -> SW weak at the end of the night - gust possible under thunderstorms
Temperature 1000 m : minimum +10°C
Temperature 1500 m : mini +8°C
Temperature 2000 m : mini +6°C

Weather forecast Thursday, 25 August 11:00am
25/08/2022 ; 11:43

After the current beautiful day, determined by high pressure centered on Scandinavia and by an influx of sub-tropical air over our regions at high altitude, unstable development still uncertain for Friday, as a trough of cooler and wetter air approaches from the west: probable thunderstorms likely in the afternoon, moderately active.
Improvement on Saturday, continuing on Sunday


Friday, August 26
Cooler - cloudy morning, thick veil - afternoon showers - thunderstorms in Italy
Showers between 11:00 and 18:00, thunderstorms on the Italian side - rain-snow limit 3300 m
Wind 1500 m : WSW light -> NW light to moderate
Wind 2500 m : SSW -> NNW weak
Temperature 1000 m : min +11°C - max +23°C
Temperature 1500 m : mini +9°C - maxi +20°C
Temperature 2000 m : mini +7°C - maxi +16°C

Weather forecast, Wednesday 24 August 6:00pm
24/08/2022 ; 18:21

Weak anticyclonic over the Alps. Weakly low pressure towards the Mediterranean. Generally, little flow over our regions, often deviated or thwarted by thermal effects. The warm air ridge aloft strengthens a little until Thursday, further drying the atmosphere. Maximum temperatures can reach 29°C at 1000 m on Thursday. Maybe 30°C…

Friday, unstable evolution approaching from the west a trough of cooler and humid air: small rain-stormy centers in the afternoon, moderately active.
Beginning of improvement, Saturday, continuing Sunday


Night from Wednesday August 24 to Thursday August 25 - Valle d'Aosta
The evening cumulus dissipates quickly - high veil evacuating slowly to the east - clear dawn
Wind 1500 m: calm or very weak variable - in the valleys, upstream thermals, weak
Wind 2500 m: very weak variable - temporarily weak SW
Temperature 1000 m: min. +11°C
Temperature 1500 m: min. +9°C
Temperature 2000 m: min. +7°C

Weather forecast, Wednesday 8:00am
24/08/2022 ; 09:22

Weak anticyclonic over the Alps. Weakly low pressure towards the Mediterranean. Very weak NNW over our regions, deviated or thwarted by the thermal effects in the valleys.
The warm air ridge aloft may strengthen a little until Thursday, drying further the atmosphere. The maximum temperatures can reach 28°C at 1000 m, this Wednesday and Thursday.

On Friday, unstable evolution on the approach from the west of a trough of cooler air and wet: high probability of a rainy-stormy episode, mainly in the afternoon
Beginning of improvement, Saturday, continuing Sunday

Wednesday August 24 - Beaufortain - Chamonix
Good weather - very thin high cloud banks scrolling from the SW - quickly very hot
Wind 1500 m: calm -> very weak variable - thermals in the valley, locally weak to moderate
Wind 2500 m: calm -> SW very weak or locally weak
Temperature 1000 m Chamonix: max +28°C
Temperature 1500 m: max +24°C
Temperature 2000 m: max +21°C
Humidity: 35-40% during hot hours

Thursday August 25 - Lower Valais - Chamonix
Sunny - very hot in the afternoon - cumulus on the massifs, voluminous in the evening
Probably no precipitation
Wind 1500 m: very weak SW - thermals in the valley, locally weak to moderate
Wind 2500 m: calm -> weak to moderate SW -> weak in the evening
Temperature 1000 m: mini +10°C - maxi +27°C
Temperature 1500 m: mini +9°C - maxi +23°C
Temperature 2000 m: mini +8°C - maxi +21°C
Humidity: 40-50% during hot hours

Friday August 26 - all regions
Unstable and cooler - some sunny spells in the morning - rainy-stormy episode in the afternoon
Precipitation begins at midday and can be temporarily quite heavy in the evening
Wind 1500 m: weak W -> weak to moderate NNW
Wind 2500 m: weak to moderate W -> moderate NW
Temperature 1000 m: mini +10°C - maxi +20°C
Temperature 1500 m: mini +9°C - maxi +17°C
Temperature 2000 m: mini +6°C - maxi +14°C

Weather forecast Tuesday, 6pm
23/08/2022 ; 17:37

Weak anticyclonic north of the Alpine arc. Slightly low pressure in the south. This difference (3 hpa) produces a weak flow of N on our regions, easily deflected weak
or canceled by thermal effects. The high altitude ridge of subtropical origin continues to strengthen until Thursday, drying the atmosphere again. Maximum temperatures can reach 29°C at 1000 m, Wednesday and Thursday. Friday, unstable evolution approaching from the west a trough of cooler and humid air, hence a high risk of thunderstorms. This risk exists again on Saturday afternoon.

He disappears on Sunday.

Night from Tuesday 23 to Wednesday 24 August - Valle d'Aosta and Beaufortain
Clear after dissipation of the evening cumulus - then thin clouds high from the west
Wind 1500 m: variable very weak -> calm - in the valleys, weak thermals upstream
Wind 2500 m: calm - temporarily weak E
Temperature 1000 m: min. +8°C
Temperature 1500 m: min. +9°C
Temperature 2500 m: min. +5°C
Humidity: 50% -> 70%

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