CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Tagaki Haruko
Being a she-bear
Wintering deep
In her lair!
ISSUED AT 08:20 WEDNESDAY JANUARY 23
VALID FROM : WEDNESDAY JANUARY 23 ‑‑ UNTIL : MONDAY JANUARY 28 2019

GENERAL SYNOPSIS
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
Cloudy, becoming overcast ‑ light snow showers in the afternoon ‑ very cold
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).morelive precipitation radar over the Alps
OVERNIGHT
Fleeting sunny spells resuming ‑ snow‑flurries still possible ‑ rather cold
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
Cloudy with sunny spells, foggy at times ‑ cold and dry
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
Cloudy with fair sunny spells ‑ cold and dry ‑ windy high up at night
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.

ReportsAs a reminder, today in Chamonix, the sun rises at 08:03:50 and goes down at 17:24:56.
45.55 N 6.51 E - Altitude 1040 m
January 23 07:00
Temperature -9°C
Relative humidity 92%
Wind 0 km/h
Sea level pressure 991 hpa - falling
Pressure at 1042 m 877 mb
Precipitation last 6h 0.0 mm
Skies cloudy - thick high cloud, 5000 m ceiling
snow depth at 1025 m : 32 cm
Visibility 25000 m
Altitude 3845 m
January 23 07:00
Temperature -20°C
Wind W 20 km/h
Altitude 2250 m
January 23 06:00
Snow depth 26 cm
Wind 15 km/h
Gusts 20 km/h
Temperature -12°C