CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
Higher than the lark
Resting in the sky
Of the mountain pass
ISSUED AT 08:20 TUESDAY AUGUST 09 2022
VALID : TUESDAY 09 -- SUNDAY AUGUST 14 2022

GENERAL SYNOPSIS
HOT - LIGHT ALTITUDE WINDS • High, 1030 hpa towards SW Ireland, stretching above 1025, Azores to Central Europe and up to Finland in the N, keeping N slopes of the Alps (Sallanches, 1018 - Sion, 1021 - Innsbruck, 1025) away from disturbances in the S. This high pressure field remains linked to some subtropical altitude high pressure ridge, which pushes hot air high up towards NE, which currently reaches the Baltic Republics. • Not much of a change this week, with persistent light flow high up, and with the Mediterranean isobaric swamp staying in place, currently 1013-1015. • However, instability will probably resume noticeable by Sunday evening, depending on an altitude cut-off crossing E of the Alpine Range while travelling from NE towards S Adriatic Sea.
TODAY - TUESDAY AUGUST 09
Great Weather - some morning cool, then high heat - small cumulus cloud in the afternoon
SKY CONDITION : clear to partly cloudy - fair weather cumulus cloud above the massifs in the afternoon. Period of sunshine close to 90%.
PRECIPITATION : none.
WIND - ground level : NE light -> calm (10:00) -> thermal SW light or locally light to moderate -> calm towards evening.
WIND - mid mountain : W light -> very light or calm.
WIND - high mountain : NNW light -> NNE very light.
TEMPERATURE : low +11°C - high +28°C.
ISOTHERM 0°C : 4300 m.
ISOTHERM -10°C : 5800 m.
OVERNIGHT
Clear night after evening cumulus cloud dispelling - cool in the valley by dawn
SKY CONDITION : cumulus cloud will end dispelling before nightfall - radiation condition will be favorable to snow surface re-freezing, above 3800 m - iso 0°C dropping slightly towards 4200 m.
PRECIPITATION : none.
WIND - aloft : NNE -> N light.
TEMPERATURE : low +13°C.
WEDNESDAY AUGUST 10
Great Weather - few degrees more in the afternoon - small cumulus cloud above the massifs
SKY CONDITION : clear to partly cloudy - fair weather cumulus cloud above the massifs in the afternoon. Period of sunshine close to 90%.
PRECIPITATION : none.
WIND - aloft : NE -> N light - occasionally calm.
TEMPERATURE : low +12 °C - high +30°C.
THURSDAY AUGUST 11
Sunny and hot, maybe sultry - more noticeable diurnal evolution pattern than previously
SKY CONDITION : clear or partly cloudy in the morning - moderate cumulus cloud growth above the massifs in the afternoon. Period of sunshine close to 80%.
PRECIPITATION : probably none.
WIND - aloft : NE -> N light - occasionally calm.
TEMPERATURE : slightly dropping lows.
EXTENDED OUTLOOK UNTIL SUNDAY AUGUST 14 2022

Friday : still fair and hot - 31°C, early afternoon. Saturday : same scenario than previously, yet less reliable. Sunday : deterioration in sight, to be confirmed.

Forecast reliability : fairly good until Thursday.

ReportsAs a reminder, today in Chamonix, the sun rises at 06:25:24 and goes down at 20:50:34.
Chamonix - ville
45.55 N 6.51 E - Altitude 1030 m
August 09, 2022 08:00
Temperature +12.2°C
Relative humidity 85%
Wind 0 km/h
Sea level pressure 1020 hpa - rising
Pressure at 1042 m 905 mb
Precipitation last 6h 0 mm
Skies clear
Visibility 95 000 m
Altitude 3845 m
August 09, 2022 08:00
Temperature +4.2°C
Wind W 10-20 km/h
Altitude 2250 m
August 09, 2022 08:00
Snow depth 0 cm
Wind 0 km/h
Gusts ESE 10 km/h
Temperature +12.8°C