Weather forecast bulletins

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Forecast for Sunday at 29 August at 9.30 am
29/08/2021 ; 13:54

High pressure remains well established over the British Isles
The cold drop over central Europe is moving away to the southeast
Moderate northerly flow between these two areas
Sunny weather, but temperatures a little below seasonal normals


Sunday August 29 - end of the course and arrival of the UTMB
All clear this morning - almost cold at first - light to cloudy and just warm in the afternoon
High visibility in the early morning - moderate development of cumulus over the mountains
over the mountains in the afternoon - more cloudy towards the east of the region
No precipitation
Wind 1000 m : predominantly NE, 5-20 km/h in the morning - neutralized by SW thermal in the afternoon
Wind 2000 m : NE to N 15-30 km/h in the morning - hardly easing in the afternoon
Temperature 1000 m : min +7°C - max +20°C
Temperature 2000 m : mini +3°C - maxi +10°C
Windchill around 2000 m : mini -3°C
Isotherm 0°C : 3000 -> 3200 m

 

Forecast of Saturday August 28 at 17:00
28/08/2021 ; 17:48

Next night and Sunday, August 29

High pressure remains well established from the British Isles to Norway
The cold drop over central Europe will move a little closer to our region this evening, then
will move away again towards the southeast on Sunday
The cloudy degradation in progress, is a little more marked and durable than the simple
development of cumulus clouds of diurnal evolution
We cannot exclude the possibility of small scattered precipitations over a large eastern quadrant
of the route in the first part of the night


Night of Saturday 28 to Sunday 29 August
Cloudy at the beginning : the cumulus clouds that developed in the afternoon dissipated more slowly than in the
the previous days; slightly higher cloudy passages occur from the north; a few
the north; some stratocumulus banks appear here and there in the middle mountains
The sky clears up quite a lot in the second part of the night
Light scattered rain, until around 24:00, La Fouly - Champex - Vallorcine
Wind 1000 m : variable weak - small gusts possible, Swiss Val Ferret, first part of the night
Wind 2000 m : N 25-35 km/h - gusts 40-60 km/h in the first part of the night
Temperature 1000 m : min +6°C
Temperature 2500 m : mini +1°C - average windchill : -6°
Isotherm 0°C : 2900 -> 3000 m


Sunday 29th August
Clear and cool in the morning after dissipation of the few cloudy residues of the night
Little cloudy and just warm in the afternoon - moderate development of cumulus
No precipitation
Wind 1000 m : variable light - temporarily NE 10-20 km/h in the morning
Wind 2000 m : NE to N 20-30 km/h in the morning - decreasing in the afternoon
Temperature 1000 m : min +6°C - max +20°C
Temperature 2000 m : mini +2°C - maxi +10°C
Isotherm 0°C : 3000 -> 3200 m

 

Forecast Saturday 28 August at 09:30
28/08/2021 ; 09:53

Period from Saturday 28 to Sunday 29 August

Cooler and windier in the north and east. Milder and less windy in the south and west
The differences between the two sides of the Alps are still quite clear this Saturday


Saturday, August 28 - Courmayeur - Bas Valais - Chamonix
Fairly sunny and cool in the morning - cloudy and barely warm in the afternoon - locally windy
Clear or partly cloudy in the morning
cumulus clouds in the south - cloudy periods in the north in the afternoon
No precipitation
Wind 1000 m in Chamonix valley : NE 15-20 km/h countered by SW thermal in the afternoon
Wind 1000 m in Valais and Aosta Valley : N dominant - 20-30 km/h, easing in the evening
Wind 2500 m : NNW 35-45 - temporarily NE 45-60 km/h
Temperature 1000 m : min +6°C - max +20°C
Temperature 2500 m : mini +2°C - maxi +8°C
Isotherm 0°C : 2900 m


Night from Saturday 28 to Sunday 29 August - Chamonix - Courmayeur
Cloudy, banks of stratus and stratocumulus
No precipitation
Wind 1000 m : light variable
Wind 2000 m : NNW 20-30 km/h -> 40-60 km/h
Temperature 1000 m : mini +6°C
Temperature 2500 m : mini +1°C
Isotherm 0°C : 2900 -> 3000 m


Sunday, August 29 - Lower Valais - Chamonix
Nice sunny spells and cloudy periods - cool in the morning - just warm in the afternoon - persistent breeze
Fairly good and long-lasting sunny spells in the middle of the day
No precipitation
Wind 1000 m : variable light - temporarily NE 10-20 km/h
Wind 2000 m : NE to N 15-30 km/h
Temperature 1000 m : min +6°C - max +20°C
Temperature 2000 m : mini +2°C - maxi +10°C
Isotherm 0°C : 3000 -> 3200 m

 

High wind and low temperature information from Friday, August 27 to 15:00
27/08/2021 ; 15:46

Friday 27 August afternoon - CCC
Grand Col Ferret 2537 m
Average wind : NNW prevailing 30-40 km/h - max gust 65 km/h
Minimum temperature : +4°C
Average windchill : -2°


Night from Friday 27 to Saturday 28 - UTMB
Bonhomme pass and Croix du Bonhomme 2433 m
Average wind : NNW to N prevailing 25-35 km/h - max gust 55 km/h
Minimum temperature : +2°C
Average windchill : -5°


Saturday August 28 - UTMB
Col de la Seigne 2516 m
Average wind : NNW prevailing 25-35 km/h - max gust 60 km/h (morning)
Minimum temperature : +1°C
Average windchill : -6°
Grand Col Ferret 2537 m
Average wind : NNW -> NNE 30-45 km/h - max gust 70 km/h (afternoon)
Minimum temperature : +2°C
Average windchill : -6°

 

Forecast of Friday August 27 at 11:00
27/08/2021 ; 12:01

Period from Friday 27 to Sunday 29 August

High pressure (1030-1025) from northern Scandinavia to the British Isles. Low 1010
over western Poland, associated with a cold drop at altitude.
Moderate north to north-westerly flow in the middle mountains over the western Alps, locally quite strong from the west of the
strong from the west of the Valais to the Aosta Valley.
Sunny conditions in the south of the high massifs. Less in the north.
Overall, temperatures a little below the seasonal average.


Friday afternoon, August 27 - Courmayeur - Chamonix
Quite sunny and warm - locally windy at high altitude
Little cloudy in the Aosta Valley, a little more towards Chamonix where the convection is stronger
No precipitation
Wind 1000 m in Chamonix valley : weak thermal SW, falling in the late afternoon
Wind 1000 m in Valais and Aosta Valley : N dominant - 15-25 km/h, easing in the evening
Wind 2500 m : dominant NNW 20-30 km/h - temporarily 35-50 km/h
Temperature 1000 m : max +21°C
Temperature 2500 m : max +9°C
Isotherm 0°C : 3400 -> 3200 m


Night from Friday 27 to Saturday 28 - Chamonix - Beaufortain - Courmayeur
Cloudy at the beginning of the night with sunny spells, then clear - cool night, locally windy at altitude
Scattered fog banks in the valleys
No precipitation
Wind 1000 m in Chamonix valley : coming from NE 10-20 km/h
Wind 1000 m in Valais and Aosta Valley : N prevailing - 5-15 km/h
Wind 2500 m : NNW -> N 25-30 km/h - temporarily 40-60 km/h
Temperature 1000 m : mini +9°C
Temperature 2500 m : mini +2°C
Isotherm 0°C : 3200 -> 3000 m


Saturday August 28 - Courmayeur - Bas Valais - Chamonix
sunny - cool in the morning - just warm in the afternoon - locally windy in the mountains
clear or partly cloudy in the morning - fair weather cumulus over the mountains in the afternoon
No precipitation
Wind 1000 m in Chamonix valley : NE 15-20 km/h countered by SW thermal in the afternoon
Wind 1000 m in Valais and Aosta Valley : N dominant - 15-30 km/h, easing in the evening
Wind 2500 m : NNW -> N 30-45 - temporarily NE 40-60 km/h
Temperature 1000 m : min +6°C - max +20°C
Temperature 2500 m : mini +3°C - maxi +8°C
Isotherm 0°C : 3000 -> 2800 m


Night from Saturday 28 to Sunday 29 August - Chamonix - Courmayeur
Becoming cloudy, frequent stratus and stratocumulus clouds
No precipitation
Wind 1000 m : variable weak
Wind 2000 m : NE 20-30 km/h -> 25-40 km/h
Temperature 1000 m : mini +7°C
Temperature 2500 m : mini +1°C
Isotherm 0°C : 2800 -> 2900 m
Sunday, August 29 - Lower Valais - Chamonix
Partly sunny - cool in the morning - just warm in the afternoon - light but persistent breeze
cloudy with sunny spells, probably quite nice and lasting in the middle of the day
No precipitation
Wind 1000 m : variable light - temporarily NE 10-20 km/h
Wind 2000 m : NE to N 10-25 km/h
Temperature 1000 m : min +6°C - max +20°C
Temperature 2000 m : mini +4°C - maxi +10°C
Isotherm 0°C : 2900 -> 3100 m

Bulletin of Friday 27 August at 05:30
27/08/2021 ; 07:53

Period from Friday 27 to Sunday 29 August

High pressure (1030-1025) from the north of Scandinavia to the British Isles. Low 1010
over western Poland, associated with a cold drop from above. Moderate north to northwest flow
flow resulting in medium mountains over the western Alps, locally quite strong from the west
of the Valais to the Aosta Valley.
Sunny conditions in the south of the high massifs. Less in the north with frequent stratus and stratocumulus
stratocumulus frequent in the first part of the morning.
Overall, temperatures a little below the seasonal average


Friday, August 27 - Courmayeur - Chamonix
Fairly sunny - cool in the morning - warm in the afternoon - locally windy at high altitude
Clear skies in the Aosta Valley in the morning - the grayness of the night dissipates under the direct sunshine
in Chamonix valley - cumulus clouds develop moderately in the afternoon over the massifs
No precipitation
Wind 1000 m in Chamonix valley : variable weak or nil in the morning -> weak SW in the afternoon
Wind 1000 m in Valais and Aosta Valley : NE to NW weak to moderate, easing in the afternoon
Wind 2500 m : W to NW 15-25, North and West Mt Blanc -> N to NW 35-50 km/h, Valais and Aosta
Temperature 1000 m : min +12°C - max +21°C
Temperature 2500 m : mini +3°C - maxi +9°C
Isotherm 0°C : 3900 -> 3000 m

Night from Friday 27 to Saturday 28 - Chamonix - Beaufortain - Courmayeur
Cloudy at the beginning of the night with sunny spells, then clear - cold night
Scattered fog banks in the valleys
No precipitation
Wind 1000 m : variable weak or nil
Wind 2500 m : N 20-30 km/h - temporarily 30-40 km/h
Temperature 1000 m : minimum +9°C
Temperature 2500 m : mini +4°C
Isotherm 0°C : 3000

Saturday, August 28 - Courmayeur - Bas Valais - Chamonix
sunny - cool in the morning - just warm in the afternoon - the wind is easing a bit in the mountains
clear or slightly cloudy in the morning - cumulus of good weather over the mountains in the afternoon
No precipitation
Wind 1000 m : variable weak or nil in the morning - weak thermals in the afternoon
Wind 2500 m : N dominant 15-25 km/h
Temperature 1000 m : min +6°C - max +20°C
Temperature 2500 m : mini +3°C - maxi +8°C
Isotherm 0°C : 3000 -> 2800 m


Night from Saturday 28 to Sunday 29 August - Chamonix - Courmayeur
Becoming cloudy, frequent stratus and stratocumulus clouds
No precipitation
Wind 1000 m : variable weak or nil
Wind 2000 m : N 20-30 km/h -> NE 25-40 km/h
Temperature 1000 m : mini +7°C
Temperature 2500 m : mini +4°C
Isotherm 0°C : 2800 -> 2900 m


Sunday, August 29 - Lower Valais - Chamonix
Partly sunny - cool in the morning - just warm in the afternoon - light but persistent breeze
cloudy with sunny spells, probably quite nice and lasting in the middle of the day
No precipitation
Wind 1000 m : variable light - temporarily NE 10-20 km/h
Wind 2000 m : NE to N 10-25 km/h
Temperature 1000 m : min +6°C - max +20°C
Temperature 2000 m : mini +4°C - maxi +10°C
Isotherm 0°C : 2900 -> 3100 m

 

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