Weather forecast bulletins

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Forecast 2nd of September 9am
02/09/2018 ; 09:41

Sunday, September 2, until 16:00


Low stratus cloud driven by the bise wind from Switzerland finally came in over Vallorcine towards

06:00, and further over the Chamonix Valley towards 06:30-06:45.

At 07:00, the cloud layer is toping towards 1500-1600 m. It will rise somewhat and mostly dispel

under direct sunshine.

Leftovers will turn into cumulus cloud over the massifs in the afternoon, which could locally hide

sunshine

Wind 2000 m : NE -> variable light

Wind 2500 m : NE -> variable -> NW light

Temperature 1000 m : lows +6 - highs +20°C

Temperature 2500 m : lows +3 (slight inversion) - highs +10°C

Forecast 1st of September 9pm
01/09/2018 ; 21:11

Night to Sunday September 2


La Fouly - La Forclaz

Cloud layer, 1700-4000 m, broken above 2500 m, then sunny outbreaks spreading over the night

hours - skies expected almost clear towards 02:00

Precipitation ending 19:00-20:00

Wind 2000 m : N 10-20 km/h, decreasing 5-10 km/h

Wind 2500 m : N 15-25 km/h, decreasing 5-10 km/h

Trient - Chamonix

Cloud layer 1500-4000 m, mostly broken, dispelling towards 23:00

No precipitation

Wind 2000 m : NE 30-40 km/h, becoming variable 5-10 km/h

Wind 2500 m : NE 30-40 km/h, decreasing 10-15 km/h

All areas

Temperature 1000 m : lows +4°C

Temperature 2500 m : lows +3°C

Windchill : -3°C

 

Sunday September 2nd


Sunny morning - cumulus cloud getting large vertical extension over the massifs in the afternoon

Wind 2000 m : variable light

Wind 2500 m : NE -> variable -> NW light

Temperature 1000 m : lows +4 - highs +21°C

Temperature 2500 m : lows +6 (inversion) - highs +10°C

Forecast 1st Of September 10am
01/09/2018 ; 10:33

Saturday September 1st


Val Vény - Val Ferret

Overcast, ceiling 2700 m westward, fog from 1700 m eastward. Thickening cloud layer at times

towards the middle of the day, beginning to dispel high up later - partly cloudy at night

Light precipitation val Ferret 11:00-15:00. Rain-snow limit towards 2500 m, rising up towards

2800 m le soir. Dry in val Vény

Wind 2000 m : NE 25-40 km/h val Ferret - 15-25 km/h val Vény

Wind Grand col Ferret : NE 30-40 km/h - at times 60 km/h early in the afternoon

La Fouly - La Forclaz

Cloud layer, 1500-2800 m, breaking above 2500 m mid-afternoon, then sunny outbreaks

spreading

Intermittent and light precipitation in the morning, then 7-8 mm 10:00-15:00. Rain-snow limit

towards 2300 m, rising

Wind 2000 m : NE 15-30 km/h - 30-40 km/h early in the afternoon

Wind 2500 m : NE 20-35 km/h - 40-50 km/h early in the afternoon

Trient - Chamonix

Overcast several layers 1500-3900 m early in the morning, then thick yet broken cloud coming

back from the northeast - sunny outbreaks later, above 2300 m at first, spreading before evening

Light precipitation along the Swiss boreder, else dry

Wind 2000 m : NE 10-20 km/h

Wind 2500 m : NE 20-35 km/h

All areas

Temperature 1000 m : lows +5 - highs +15°C

Temperature 2500 m : lows +2 - highs +5°C

Windchill : +2 à -6°C

 

Night to Sunday


Becoming partly cloudy - some high cloud crossing over from the northeast

Wind 2000 m : N 15-30 km/h -> light

Wind 2500 m : NNE 15-25 km/h - at times 25-35 km/h

Temperature 1000 m : lows +5°C

Temperature 2500 m : lows +5°C (inversion)

 

Sunday September 2nd


Sunny morning - fat cumulus cloud over the massifs in the afternoon with shower risk later

Wind 2000 m : variable light

Wind 2500 m : NNE -> variable -> NW light

Temperature 1000 m : lows +5 - highs +20°C

Temperature 2500 m : lows +6 (inversion) - highs +10°C

 

Forecast 31st 1pm
31/08/2018 ; 13:20

UTMB Weather deterioration: bad weather until Saturday afternoon, very cold, windy, feels like -10 ° C (14 ° F). Cold weather kit essential.

 

Friday 31, afternoon - CCC and UTMB courses


CCC, Italian val Ferret : mainly cloudy, layer 1800-2000 m

No precipitation

UTMB, Chamonix-Contamines : mainly cloudy, layer 1800-2500 m

Showers < 3 mm, 18:00-20:00 - rain-snow limit 2800 -> 2600 m - snow cover : none

Wind 2000 m : NW 5-10 km/h, Swiss and French Slopes, veering N 5-10 km/h towards 19:00

Wind 2500 m : W 5-20 km/h -> N 20-30 km/h, 60 km/h at times, Swiss Ferret, 20:00-23:00

Temperature 1000 m : highs +16°C

Temperature 2500 m : highs +7°C

 

Night to Saturday - CCC and UTMB courses


Mainly cloudy, layer 1800-2500 m, Valais and France

Precipitation with barrier effect against the northern slopes, France and Valais from 03:00,

2-3 mm/h - rain-snow limit dropping towards 2400 m - snow depth < 5 cm

Cloudy with sunny spells above the Italian Valleys, becoming mostly cloudy with light precipitation

running over from the north as of 05:00-06:00, rain-snow limit 2500 m

Wind 2000 m : N -> NE 15-30 km/h

Wind 2500 m : NE 20-30 km/h, 60 km/h at times Grand col Ferret

Temperature 1000 m : lows +6°C UTMB • +5°C CCC

Temperature 2500 m : lows -2 to +2°C

Windchill : -5 to -11°C, worst

 

Saturday September 1st - CCC and UTMB courses


So called « retour d’est », meaning thick cloud stuck over Valais running over French and Italian

bordering ridges

Light precipitation until 11:00-12:00. Rain-snow limit dropping towards 2300 m along Swiss

slopes, remaining higher elsewhere

Wind 2000 m : NE 15-30 km/h - 30-40 km/h, Valais in the morning

Wind 2500 m : NE 20-35 km/h - 50-60 km/h, Valais in the morning

Temperature 1000 m : lows +6 - highs +17°C

Temperature 2500 m : lows -2 - highs +6°C

Windchill : -1 to -11°C, worst

 

Night to Sunday - UTMB course


Becoming partly cloudy

Wind 2000 m : N 15-30 km/h -> light

Wind 2500 m : NNE 10-20 km/h

Temperature 1000 m : lows +4°C

Temperature 2500 m : lows +5°C (inversion)

 

Sunday September 2nd - UTMB course


Sunny morning - fat cumulus cloud over the massifs in the afternoon

Wind 2000 m : variable light

Wind 2500 m : NW light

Temperature 1000 m : lows +5 - highs +20°C

Temperature 2500 m : lows +6 (inversion) - highs +10°C

 

 

 

Forecast 31st 9am
31/08/2018 ; 09:14

Friday 31 - CCC and UTMB courses


CCC : mainly cloudy, then sunny spell 09:00-12:00 - resuming mainly cloudy, base 1800-2000 m

No precipitation

UTMB : mainly cloudy, base 2000-2500 m, 18:00-21:00 - clear spells spreading thereafter

Light and scattered showers < 3 mm, 15:00-19:00

Wind 2000 m : W 5-20 km/h, Swiss and French Slopes, veering N 5-10 km/h towards 19:00

Wind 2500 m : W 5-20 -> NNE 20-30 km/h, 50 km/h at times, Valais, towards 20:00

Temperature 1000 m : lows +11 - highs +16°C

Temperature 2500 m : lows +2 - highs +7°C

 

Night to Saturday - CCC and UTMB courses


Mainly cloudy, base 2000-2500 m, Valais and Italy; partly cloudy in France - no precipitation

Wind 2000 m : NW -> NE 15-30 km/h

Wind 2500 m : NE 20-30 km/h

Temperature 1000 m : lows +6°C UTMB • +5°C CCC

Temperature 2500 m : lows +3°C UTMB • +1°C CCC

Saturday September 1st - CCC and UTMB courses

Cloudy with sunny spells and bise wind - stronger over the Swiss Courses

Wind 2000 m : NE 15-30 km/h

Wind 2500 m : NE 15-30 km/h

Temperature 1000 m : lows +6 - highs +18°C

Temperature 2500 m : lows +2 - highs +9°C

 

Night to Sunday - UTMB course


Partly cloudy

Wind 2000 m : N light

Wind 2500 m : NNE 10-20 km/h

Temperature 1000 m : lows +5°C

Temperature 2500 m : lows +5°C (inversion)

 

Sunday September 2nd - UTMB course


Sunny morning - fat cumulus cloud over the massifs in the afternoon

Wind 2000 m : variable light

Wind 2500 m : NW light

Temperature 1000 m : lows +5 - highs +20°C

Temperature 2500 m : lows +6 (inversion) - highs +10°C

Forecast 30th 1.30pm
30/08/2018 ; 13:46

The CCC will start on time on the normal rout except in the Tete aux Vents https://goo.gl/gGZzVz

 

Thursday 30, afternoon - TDS ending and OCC courses


Mont-Blanc Massif W quadrant TDS : sunny spells spreading over the afternoon hours

Fairly sunny on OCC course

Wind 2000 m : variable light or calm on TDS course • light to moderate thermal breeze on OCC

Wind 2500 m : W 10-15 km/h on TDS • calme -> N 5-10 km/h on OCC

Temperature 1000 m : highs +21°C

Temperature 2500 m : lows +6 - highs +13°C

 

Friday 31 - CCC and UTMB courses


Cloudy with sunny spells in Italy - Mainly Cloudy over the Swiss and French Slopes

Thundery shower risk from the NW 17:00-20:00, higher over the Swiss part of the course

No precipitation in Italy

Wind 2000 m : NW 10-25 km/h, Swiss and French Slopes - light northerly foehn in Italy

Wind 2500 m : NNW 40-50 -> NNE 20-30 km/h

Temperature 1000 m : lows +10 - highs +18°C

Temperature 2500 m : lows +2 - highs +7°C

Humidity : 50-70%

 

Night to Saturday - CCC and UTMB courses


Cloud passings from the northeast, then sunny spells - dry

Wind 2000 m : NW -> NE 15-30 km/h

Wind 2500 m : NNE 20-30 km/h

Temperature 1000 m : lows +6°C

Temperature 2500 m : lows +3°C

 

Saturday September 1st - CCC and UTMB courses


Fairly sunny with bise wind - stronger over the Swiss Courses

Wind 2000 m : NE 15-30 km/h

Wind 2500 m : NE 15-30 km/h

Temperature 1000 m : lows +6 - highs +18°C

Temperature 2500 m : lows +2 - highs +9°C

 

Night to Sunday - UTMB course


Calm weather

Wind 2000 m : N light

Wind 2500 m : NNE 10-20 km/h

Temperature 1000 m : lows +5°C

Temperature 2500 m : lows +5°C (inversion)

 

Sunday September 2nd - UTMB course


Fair weather - cumulus cloud over the massifs in the afternoon

Wind 2000 m : light to moderate thermal breeze

Wind 2500 m : NW light

Temperature 1000 m : lows +5 - highs +23°C

Temperature 2500 m : lows +6 (inversion) - highs +10°C

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