CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST
ISSUED AT 07:50 SUNDAY OCTOBER 4
VALID FROM : SUNDAY OCTOBER 4 ‑‑ UNTIL : FRIDAY OCTOBER 9 2015
Ask the breeze
First to fall will be
Last night’s disturbance is moving away northeastward, leaving some humidity in the valley. This Sunday will however be sunny in a still fairly high pressure field, yet ahead of a huge low system, currently extending southeast of Greenland to northwest of Spain, which will be driving two disturbances over the Alps by the middle of the week : a fairly weak warm front on Monday evening and overnight, and a noticeably more active cold front from Tuesday afternoon until Wednesday morning.
TODAY - SUNDAY OCTOBER 4
SKY CONDITION : early morning thick stratus cloud, dispelling ‑ becoming clear or partly cloudy ‑ high cloud coming in from the southwest towards the latter part of the afternoon. Period of sunshine close to 70%.
PRECIPITATION : none.
WIND - ground level : variable light.
WIND - mid mountain : SW ‑> variable light ‑> SSW light to moderate.
WIND - high mountain : W strong to gale force ‑> WNW moderate.
TEMPERATURE : low +8°C - high +16°C.
ISOTHERM 0°C : 2200 ‑> 3100 m.
ISOTHERM -10°C : 3800 ‑> 5200 m.
ROAD CONDITION ••••• : @ 07:30, humid roadways.
SKY CONDITION : high cloud crossing over from the west ‑ at times fairly thick towards the middle of the night.
PRECIPITATION : none.
WIND - aloft : WNW moderate ‑> moderate to strong.
TEMPERATURE : low +8°C.
MONDAY OCTOBER 5
SKY CONDITION : partly cloudy early in the morning ‑ becoming mainly cloudy, then overcast in the afternoon. Period of sunshine close to 30%.
PRECIPITATION : starting up towards the latter part of the afternoon, light ‑ becoming moderate in the evening ‑ rain‑snow limit towards 3200 m.
WIND - aloft : WNW ‑> WSW moderate to strong ‑ strong at times.
TEMPERATURE : low +8 °C - high +17°C.
TUESDAY OCTOBER 6
SKY CONDITION : cloudy with sunny spells in the morning ‑ becoming overcast in the afternoon. Period of sunshine close to 30%.
PRECIPITATION : starting up towards the middle of the day, light ‑ becoming moderate to heavy later in the afternoon ‑ rain‑snow limit dropping towards 2500 m.
WIND - aloft : WSW moderate.
TEMPERATURE : rising lows ‑ dropping highs.
EXTENDED OUTLOOK UNTIL FRIDAY OCTOBER 9 2015
Wednesday : changeable and cooler ‑ showers and fleeting sunny spells in turn. Thursday and Friday : uncertain ‑ early morning low cloud likely, then fairly sunny ‑ cool in the morning ‑ mild in the afternoon. Southwesterly stream possibly reaching gale force high up by the end of the period.
Forecast reliability : fairly good until Monday ‑ poor thereafter.