CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Taneda Santōka
Snow
Falls on snow—
And remains silent
ISSUED AT 10:15 MONDAY JANUARY 30 2023
VALID : MONDAY JANUARY 30 -- SATURDAY FEBRUARY 04 2023

GENERAL SYNOPSIS
High 1033 hpa halfway between Azores and Ireland, extended by some 1020 ridge more or less up to Austrian Alps. • Mediterranean low was recently completely filling, but a Bise gradient persists between Savoy and Piedmont, which might get occasionally tighter in the afternoon. • Further outlook, i.e. weather turn into NW pattern, barely milder atmosphere and cloudy at times, until disturbance crossing expected on Thursday, seems less and less relevant. Azores high seems now likely to refocusing towards 1040 hpa S close to Brittany by Friday : first 10-day of February might therefore remain dry (and cold) instead.
TODAY - MONDAY JANUARY 30 2023
Fairly sunny - getting slightly milder - gale force winds high up in the afternoon
SKY CONDITION : partly cloudy this morning - several cloud pattern following one another high up, turbulent flow - clear in the afternoon. Period of sunshine close to 80%.
PRECIPITATION : none.
WIND - ground level : calm or variable very light -> SW trend in the afternoon.
WIND - mid mountain : mainly N - light to moderate - occasionally moderate.
WIND - high mountain : N moderate to strong -> NNW gale force.
TEMPERATURE : low -9°C - high +1°C - temperature inversion toward 1300 m early in the morning.
ISOTHERM 0°C : 1800 -> 1200 m.
ISOTHERM -10°C : 4000 -> 4200 m.
OVERNIGHT
Clear night, very cold in the valley - very strong wind high up
SKY CONDITION : clear - however, risk of stratus cloud layer condensing in the valley cannot be completerly ruled out - iso 0°C rising up towards 1200 m (temperature inversion).
PRECIPITATION : none.
WIND - aloft : NNW gale force -> N strong.
TEMPERATURE : low -6°C - temperature inversion toward 1100 m.
TUESDAY JANUARY 31 2023
Sunny - very cold morning in the valley - milder on sunny slopes later - strong wind high up
SKY CONDITION : clear or partly cloudy until mid-afternoon - fairly thin high cloud running over from N high up thereafter. Period of sunshine close to 95%.
PRECIPITATION : none.
WIND - aloft : N -> WNW strong.
TEMPERATURE : low -7 °C - high +3°C - temperature inversion toward 1200 m early in the morning.
WEDNESDAY FEBRUARY 01 2023
Sunny and very cold in the morning, then getting milder and cloudy - severe gale high up
SKY CONDITION : clear or partly cloudy early in the morning - thickening high cloud running over thereafter, then invading median altitude range. Period of sunshine close to 65%.
PRECIPITATION : none.
WIND - aloft : NW strong -> NNW severe gale.
TEMPERATURE : rising slightly.
EXTENDED OUTLOOK UNTIL SATURDAY FEBRUARY 04 2023

Thursday : uncertain - cold front, almost inactive, dispelling while reaching the High Massifs - storm winds likely high up. Friday : uncertain - changeable and slightly milder condition, with thick cloud crossing over and short sunny outbreaks in turn - probably strong N wind high up. Saturday : very uncertain - fair weather likely, getting noticeably milder, light winds in the median altitude range, mainly N.

Forecast reliability : fairly good until Tuesday - poor thereafter.

ReportsAs a reminder, today in Chamonix, the sun rises at 07:55:22 and goes down at 17:36:33.
Chamonix - ville
45.55 N 6.51 E - Altitude 1030 m
January 30, 2023 08:00
Temperature -9.2°C
Relative humidity 91%
Wind 0 km/h
Sea level pressure 1030 hpa - rising
Pressure at 1042 m 905 mb
Precipitation last 6h 0 mm
Skies partly cloudy
Visibility 100 000 m
Altitude 3845 m
January 30, 2023 08:00
Temperature -11.7°C
Wind NNW 20-50 km/h
Altitude 2250 m
January 30, 2023 08:00
Snow depth 60 cm
Wind WNW 5 km/h
Gusts 25 km/h
Temperature -1.9°C