Mt d'Arbois - 22/02/19

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Mt Blanc Valley Weather - 3 Day Forecast

Our high has been drifting over Northwestern France, toping at 1035hpa. Same move for its altitude component, with the Western Saharan mild air vein, that feeds it, away northwestward as well: temperature therefore dropping slightly in the median altitude range. That high pressure pattern will be temporarily refocusing towards 1045hpa over Southern Baltic Sea, before drifting back again slowly towards the Alpine Range. Weakening pressure field, Balkans to Northern Italy creates fairly tight Bise gradient (‑7hpa) over our Region this Friday. Main consequence: temporarily strong northeast stream highup, that will decrease gradually on Saturday.
TODAY - FRIDAY FEBRUARY 22
Sunny ‑ cold in the morning, then mild on south facing slopes ‑ strong wind high up
SKY CONDITION : clear or partly cloudy ‑ high and orographic cloud. Period of sunshine close to 90%.
PRECIPITATION : none.
WIND - ground level : NE light to moderate ‑ moderate at times ‑> light.
WIND - mid mountain : NE moderate ‑> moderate to strong ‑> ENE light to moderate.
WIND - high mountain : NNE moderate to strong ‑> NE strong.
TEMPERATURE : low ‑5C - high +13C - temperature inversion toward 1200 m early in the morning.
ISOTHERM 0C : 2600 ‑> 2400 ‑> 3400 m.
ISOTHERM -10C : 4700 ‑> 4900 m.
ROAD CONDITION : possible black ice patches during the night and early in the morning. (Fri.06:00).more
OVERNIGHT
Clear night ‑ rather chilly in the valley‑ windy high up
SKY CONDITION : clear or partly cloudy ‑ some orographic cloud.
PRECIPITATION : none.
WIND - aloft : NE strong ‑> moderate to strong.
TEMPERATURE : low ‑5C - temperature inversion toward 1400 m.
SATURDAY FEBRUARY 23
Sunny ‑ cold in the morning ‑ mild ou south facing slopes later ‑ windy high up
SKY CONDITION : clear or partly cloudy. Period of sunshine close to 95%.
PRECIPITATION : none.
WIND - aloft : NE moderate to strong ‑> ENE moderate.
TEMPERATURE : low ‑5 C - high +12C - temperature inversion toward 1300 m early in the morning.
SUNDAY FEBRUARY 24
Fair weather cold in the morning‑ very mild in the afternoon
SKY CONDITION : clear. Period of sunshine close to 95%.
PRECIPITATION : none.
WIND - aloft : ENE moderate.
TEMPERATURE : rising slightly.
EXTENDED OUTLOOK UNTIL WEDNESDAY FEBRUARY 27 2019

Monday: fair weather ‑ almost warm in the afternoon on sunny slopes ‑ fairly strong east to northeast at times highup. Tuesday: sunny ‑ summer‑like atmosphere in the afternoon. Wednesday: amazingly fair weather ‑ summer atmosphere in the afternoon.

Forecast reliability : fairly good until Sunday.