CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
On a mountain path
Something might charm you
A wild violet
ISSUED AT 07:55 MONDAY JULY 25
VALID FROM : MONDAY JULY 25 ‑‑ UNTIL : SATURDAY JULY 30 2016

GENERAL SYNOPSIS
Extended low, 1007 hpa over Northern Scotland this morning. Linked cold front, fairly blur, currently over Northwestern France, drifting very slowly southeast. It might be fading further before getting to the vicinity of the Alps by Wednesday. • Today’s weather will be mainly influenced by the Azores high ridge, which is currently higher than 1020 hpa over the region, thus reducing the instability linked to Central Europe’s loose gradient area. • It will be however weakening somewhat over the hours, leading again to some isolated thundery shower over the massifs towards the latter part of the afternoon. • About the same scenario might happen on Tuesday, yet with a longer lasting sunshine.
TODAY - MONDAY JULY 25
Sunny morning ‑ cumulus cloud growing over the massifs ‑ isolated shower risk later
SKY CONDITION : sunny morning ‑ becoming cloudy or locally mostly cloudy in the afternoon ‑ large cumulus cloud growth over the massifs. Period of sunshine close to 60%.
PRECIPITATION : isolated thundery shower risk towards the latter part of the afternoon ‑ rain‑snow limit towards 3900 m.
WIND - ground level : NE ‑> thermal SW ‑> variable light.
WIND - mid mountain : NE ‑> variable ‑> NW light.
WIND - high mountain : variable ‑> W light.
TEMPERATURE : low +10°C - high +24°C - temperature inversion toward 1300 m early in the morning.
ISOTHERM 0°C : 4100 ‑> 4200 m.
ISOTHERM -10°C : 5800 m.
OVERNIGHT
Clearing skies ‑ cool by dawn
SKY CONDITION : cloudy at first ‑ becoming clear or partly cloudy.
PRECIPITATION : none.
WIND - aloft : W light ‑> WNW light to moderate.
TEMPERATURE : low +10°C - temperature inversion toward 1300 m.
TUESDAY JULY 26
Fairly sunny ‑ warm in the afternoon ‑ evening shower slight risk
SKY CONDITION : clear or partly cloudy in the morning ‑ becoming cloudy during the afternoon. Period of sunshine close to 80%.
PRECIPITATION : late afternoon shower slight risk over the massifs.
WIND - aloft : WNW ‑> W light.
TEMPERATURE : low +10 °C - high +25°C - temperature inversion toward 1300 m early in the morning.
WEDNESDAY JULY 27
Sunny morning ‑ cloudy deterioration in the afternoon ‑ getting colder high up
SKY CONDITION : clear or partly cloudy in the morning ‑ becoming cloudy or locally mostly cloudy in the afternoon. Period of sunshine close to 50%.
PRECIPITATION : late afternoon shower slight risk.
WIND - aloft : WSW ‑> W faible à modéré.
TEMPERATURE : dropping slightly.
EXTENDED OUTLOOK UNTIL SATURDAY JULY 30 2016

Thursday and Friday : sunny ‑ cool in the morning ‑ getting hot over the days in the afternoon. Saturday : loose gradient over the Alps, thus resuming instability causing rainy‑thundery deterioration during the following night. As of Friday, altitude stream, mainly W, might increase to fairly strong.

Forecast reliability : poor.

ReportsAs a reminder, today in Chamonix, the sun rises at 06:08:10 and goes down at 21:09:57.
45.55 N 6.51 E - Altitude 1040 m
25 July 07:00
Temperature +10°C
Relative humidity 90%
Wind 0 km/h
Sea level pressure 1022 hpa - falling slowly
Pressure at 1042 m 905 mb
Precipitation last 6h 0.0 mm
Skies clear
Visibility 75000 m
Altitude 3845 m
25 July 07:00
Temperature -1°C
Wind N 10 km/h
Altitude 2250 m
25 July 06:00
Snow depth 0 cm
Wind 10 km/h
Gusts 20 km/h
Temperature +10°C