CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST
ISSUED AT 08:20 WEDNESDAY JANUARY 23
VALID FROM : WEDNESDAY JANUARY 23 ‑‑ UNTIL : MONDAY JANUARY 28 2019
Being a she-bear
In her lair!
Maritime polar air thalweg, Iceland to Sicily. Minimum 993 hpa Northern France early this morning, embedded in that corridor, drifting south while deepening and linking to an altitude cold drop over Burgundy. This shaped system drives an occlusion that is expected to reaching Northwestern Alps early in the afternoon, triggering light and scattered snow showers. • Changeable, dry and considerably colder than seasonable on Thursday and Friday. • Being susceptible to tiny trajectory shifts of low centers, this wintry outlook remains rather uncertain.
TODAY - WEDNESDAY JANUARY 23
SKY CONDITION : high cloud veiling skies early in the morning ‑ thickening quickly ‑ overcast by the middle of the day, then fog patches sticking to the slopes. Period of sunshine close to 5%.
PRECIPITATION : light and scattered snow shower, mostly between 14:00 and 20:00 ‑ rain‑snow limit below 500 m ‑ expected snowfall towards 1200 : ± 5 cm, uncertain.
WIND - ground level : calm or variable very light.
WIND - mid mountain : WSW ‑> WNW very light.
WIND - high mountain : W ‑> N ‑> ESE light.
TEMPERATURE : low ‑10°C - high ‑4°C.
ISOTHERM 0°C : < 400 m.
ISOTHERM -10°C : 2200 ‑> 2000 m.
ROAD CONDITION ••••• : hardened snow patches remaining on roadways besides treated itineraries. (Wed. 06:30).
SKY CONDITION : mostly cloudy ‑ hazy or foggy outbreaks arising, fleeting at first.
PRECIPITATION : some snow‑flurries still possible in the first part of the night.
WIND - aloft : ESE ‑> NE light.
TEMPERATURE : low ‑8°C.
THURSDAY JANUARY 24
SKY CONDITION : cloudy with sunny spells, at times hazy of foggy ‑ broken cloud patches, in the median and high altitude range. Period of sunshine close to 45%.
PRECIPITATION : none.
WIND - aloft : NE light ‑> N moderate.
TEMPERATURE : low ‑10 °C - high ‑3°C.
FRIDAY JANUARY 25
SKY CONDITION : cloudy with fair sunny spells, especially in the afternoon. Period of sunshine close to 65%.
PRECIPITATION : none.
WIND - aloft : N moderate to strong ‑> NNE strong.
TEMPERATURE : rising slightly.
EXTENDED OUTLOOK UNTIL MONDAY JANUARY 28 2019
Saturday : cloudy with sunny spells ‑ light snow shower starting up in the afternoon ‑ strong north by northeast high up ‑ very cold. Sunday : intermittent and light snowfall ‑ cold ‑ west, then north, fairly strong at times high up. Monday : cloudy with sunny spells ‑ dry and cold. • Very uncertain wintry weather during the three days.
Forecast reliability : poor.