CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST
ISSUED AT 10:25 WEDNESDAY MARCH 29 2023
VALID : WEDNESDAY MARCH 29 -- MONDAY APRIL 03 2023
With young leaves
I would like to wipe away
The tears in your eyes
High cell that protected our Region was recently drifting towards Sicily and Tunisia (1029 hpa). Linked subtropical anticyclonic spur is currently pivoting right towards N Balkans, thus making the altitude stream shift W, then WSW, over the Alpine Range (Chamonix, 1025 - Sion, 1024 - Innsbruck, 1023). • By the very end of this week, huge low already raging over N Atlantic (up to Azores towards S), is expected to drive several minima, S Ireland -> N Germany, in a cooling air mass on the whole, thus triggering a considerable unsettled and cold deterioration.
Avalanche risk is considerable [3/5] above 2500 m (Wed. 16:00)
TODAY - WEDNESDAY MARCH 29 2023
SKY CONDITION : cloud crossing over, fairly high, though fairly thick - ceiling drop towards 2500 m early in the afternoon - veiled sunny spell later. Period of sunshine close to 15%.
PRECIPITATION : scattered, mostly over the massifs - more sustained and extended early in the afternoon - rain-snow limit rising up towards 2500 m - 8-10 cm snowfall, windblown.
WIND - ground level : mainly SW - very light to light.
WIND - mid mountain : W -> WNW moderate.
WIND - high mountain : waving between NW et WNW - moderate to strong, occasionally strong.
TEMPERATURE : low +3°C - high +13°C.
ISOTHERM 0°C : 2600 -> 2800 m.
ISOTHERM -10°C : 4200 -> 4400 m.
SKY CONDITION : mainly cloudy - fleeting clear spells likely, shortly after dusk and towards dawn - iso 0°C towards 2700 m.
PRECIPITATION : some raindrops at times - rain-snow limit towards 2300-2400 m.
WIND - aloft : WNW moderate to strong -> WSW strong.
TEMPERATURE : low +6°C.
THURSDAY MARCH 30 2023
SKY CONDITION : mostly cloudy, possible fleeting sunny spells - overcast in the median altitude range at times. Period of sunshine close to 20%.
PRECIPITATION : light and scattered shower in the morning - heavier and more frequent in the afternoon - rain-snow limit towards 2200 m, dropping - 10 to 20 cm snowfall towards 2500 m, windblown.
WIND - aloft : WSW strong -> WNW severe gale.
TEMPERATURE : low +5 °C - high +13°C.
FRIDAY MARCH 31 2023
SKY CONDITION : mostly cloudy - overcast in the median altitude range at times. Period of sunshine close to 15%.
PRECIPITATION : light and scattered shower in the morning - heavier and more frequent in the afternoon - rain-snow limit dropping towards 1300 m - 25 to 40 cm snowfall towards 2000 m, windblown.
WIND - aloft : WSW severe gale -> W strong.
TEMPERATURE : dropping.
EXTENDED OUTLOOK UNTIL MONDAY APRIL 03 2023
Saturday : uncertain - still very unsettled from W with still considerable snowfall towards 1500 m (> 30 cm) - WNW gale likely in the morning high up, decreasing in the afternoon. Sunday : very uncertain - remaining snow shower likely in the valley at first - slight "risk" of sunny spell in the afternoon while altitude stream veers NNE moderate, possibly fairly strong towards evening. Monday : possibly improving, to be confirmed, fairly sunny on the whole, yet still rather cold (iso 0 towards 1000 m).
Forecast reliability : fairly good until Thursday - poor as of Thursday.