CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
Drunk on flowers
The woman armed with a sword
Wears a man's jacket
ISSUED AT 07:50 WEDNESDAY AUGUST 22
VALID FROM : WEDNESDAY AUGUST 22 ‑‑ UNTIL : MONDAY AUGUST 27 2018

GENERAL SYNOPSIS
Former Azores to Central Europe high ridge is currently breaking up. Pressure field turns into loose gradient area over the western part of the Mediterranean Basin. This weakening process will allow for two disturbances following each other to crossing over the Alps southeastward bound by the end of the week. • Light southeasterly stream, maybe somewhat more unstable and humid this Wednesday than yesterday. • Summer weather with diurnal evolution continues, still sunny in the morning, while hot and cloudy in the afternoon with noticeable thunderstorm risk. • Same kind of weather on Thursday. • As soon as the following night will begin the weather change which will lead to fair yet unseasonably cool condition in the first part of next week.
TODAY - WEDNESDAY AUGUST 22
Sunny morning ‑ sultry and cloudy in the afternoon with thunderstorm risk
SKY CONDITION : clear or partly cloudy in the morning ‑ cloudy to locally mostly cloudy due to large cumulus cloud growth in the afternoon. Period of sunshine close to 50%.
PRECIPITATION : afternoon thunderstorm risk ‑ rain‑snow limit towards 3800 m ‑ 5‑7 mm water likely locally.
WIND - ground level : NE light ‑ SW light to moderate in the first part of the afternoon.
WIND - mid mountain : variable ‑> SE light.
WIND - high mountain : E ‑> SE light.
TEMPERATURE : low +10°C - high +28°C.
ISOTHERM 0°C : 4000 m.
ISOTHERM -10°C : 5600 m.
OVERNIGHT
Partly clearing skies ‑ still fairly mild in the median altitude range
SKY CONDITION : cloudy, then partly cloudy after evening cloud dispelling.
PRECIPITATION : possible remaining shower ending by nightfall.
WIND - aloft : SE ‑> S light.
TEMPERATURE : low +10°C.
THURSDAY AUGUST 23
Partly sunny, then cloud passings from the southwest ‑ thunderstorm risk
SKY CONDITION : partly cloudy to cloudy ‑ cloud passings from the southwest, more frequent in the afternoon. Period of sunshine close to 55%.
PRECIPITATION : thunderstorm risk in the afternoon, then showers in the evening and during the following night ‑ rain‑snow limit towards 3700 m, dropping.
WIND - aloft : S light ‑> WSW light to moderate.
TEMPERATURE : low +9 °C - high +26°C.
FRIDAY AUGUST 24
Changeable ‑ sunny spells, then showers ‑ cold front crossing over in the afternoon
SKY CONDITION : often mostly cloudy ‑ fleeting sunny spells in the afternoon. Period of sunshine close to 30%.
PRECIPITATION : shower passing in the morning, locally heavy with possible local thunderstorm ‑ scattered shower still possible in the afternoon.
WIND - aloft : WSW light to moderate ‑> W moderate.
TEMPERATURE : noticeably dropping highs.
EXTENDED OUTLOOK UNTIL MONDAY AUGUST 27 2018

Saturday : frequent shower ‑ some sunny spells ‑ cooling continues ‑ fairly strong west high up. • Cold front crossing over the area during the following night ‑ rain‑snow limit possibly dropping towards 2000 m. • Sunday : still unsettled in the morning ‑ light to moderate rain ‑ cooling continues ‑ improving later. Monday : fair weather ‑ rather cool in the morning ‑ barely warm in the afternoon.

Forecast reliability : fairly good until Thursday.

ReportsAs a reminder, today in Chamonix, the sun rises at 06:41:26 and goes down at 20:29:12.
45.55 N 6.51 E - Altitude 1040 m
August 22 07:00
Temperature +10°C
Relative humidity 90%
Wind 0 km/h
Sea level pressure 1021 hpa - steady
Pressure at 1042 m 903 mb
Precipitation last 6h 0.0 mm
Skies clear
Visibility 80000 m
Altitude 3845 m
August 22 07:00
Temperature +1°C
Wind S 5 km/h
Altitude 2250 m
August 22 06:00
Snow depth 0 cm
Wind 0 km/h
Gusts 5 km/h
Temperature +11°C