CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
Withered by winter
One-colored world—
The sound of wind
ISSUED AT 09:10 SUNDAY FEBRUARY 23
VALID FROM : SUNDAY FEBRUARY 23 ‑‑ UNTIL : FRIDAY FEBRUARY 28 2020

GENERAL SYNOPSIS
High, Azores to Western Black Sea, toping 1035‑1032 Northern Spain to Northwestern Alpine Range, going along with subtropical air push high up reaching Ukraine. • This pattern will soon begin to withdraw over the Ocean while collapsing high up towards its eastern part, yet drawing out its protection to our Region against Atlantic disturbances until Monday evening. • Thus, Monday will be the last day of the fair weather spell we’re currently experiencing. • Tiny low crossing over British Isles overnight and on Monday will however tighten pressure gradient northwest close to our High Massifs and already strong westerly altitude stream will increase to severe northwest gale in the afternoon of this Sunday.
TODAY - SUNDAY FEBRUARY 23
Fairly sunny ‑ very mild in the afternoon ‑ increasing to severe gale high up
SKY CONDITION : partly cloudy or occasionally cloudy in the morning, high cloud from west somewhat thick at times, with orographic cloud as well ‑ clear or partly cloudy in the afternoon ‑ median altitude range cloud crossings towards the evening. Period of sunshine close to 70%.
PRECIPITATION : none.
WIND - ground level : calm ‑> SW light.
WIND - mid mountain : W ‑> WNW moderate ‑ locally moderate to strong.
WIND - high mountain : WNW strong ‑> NW severe gale.
TEMPERATURE : low ‑1°C - high +15°C.
ISOTHERM 0°C : 2900 m.
ISOTHERM -10°C : 5000 m.
OVERNIGHT
Clearing skies ‑ slightly decreasing altitude gale ‑ temperature inversion
SKY CONDITION : partly cloudy in the first part of the night ‑ then clear.
PRECIPITATION : none.
WIND - aloft : NW severe gale ‑> strong.
TEMPERATURE : low ‑2°C - temperature inversion toward 1400 m.
MONDAY FEBRUARY 24
Fair weather ‑ very mild in the afternoon ‑ still much wind high up in the morning
SKY CONDITION : clear. Period of sunshine close to 100%.
PRECIPITATION : none.
WIND - aloft : NW strong ‑> WSW moderate to strong.
TEMPERATURE : low ‑3 °C - high +17°C - temperature inversion toward 1200 m early in the morning.
TUESDAY FEBRUARY 25
Morning sunny spell ‑ moderate rain in the afternoon ‑ evening snow
SKY CONDITION : short sunny spell early in the morning before income of a cold front from northwest ‑ becoming quickly overcast shortly before noon. Period of sunshine close to 30%.
PRECIPITATION : moderate rain in the afternoon ‑ rain‑snow limit towards 1600 m, dropping towards 1100 m in the evening ‑ possibly 20‑30 cm towards 1800 m by the end of the night to Tuesday.
WIND - aloft : SW ‑> WSW near gale.
TEMPERATURE : dropping highs.
EXTENDED OUTLOOK UNTIL FRIDAY FEBRUARY 28 2020

Wednesday : very unsettled, cold ‑ moderate snowfall (< 600 m) ‑ altitude SW ‑> NW sudden shift, whole gale. Thursday : unsettled, starting up to getting milder ‑ still lots of northwest winds high up ‑ frequent snow shower (1000‑1200 m). Friday : unsettled ‑ getting further mild (snow 1500 m) ‑ altitude stream barely decreasing while veering southwest.

Forecast reliability : fairly good until Monday.

ReportsAs a reminder, today in Chamonix, the sun rises at 07:21:44 and goes down at 18:09:58.
45.55 N 6.51 E - Altitude 1020 m
February 22 - 07:00
Temperature -1°C
Relative humidity 87%
Wind 0 km/h
Sea level pressure 1031 hpa - rising
Pressure at 1042 m 913 mb
Precipitation last 6h 0.0 mm
Skies partly cloudy - orographic cloud - snow depth : 1 cm
Visibility 80000 m
Altitude 3845 m
February 22 - 22:00
Temperature -9°C
Wind WNW 80 km/h
Altitude 2250 m
February 22 - 06:00
Snow depth 192 cm
Wind 15 km/h
Gusts 20 km/h
Temperature +4°C