CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
On a mountain path
Something might charm you
A wild violet
ISSUED AT 18:25 ON SATURDAY SEPTEMBER 13, 2014
VALID FROM : SATURDAY SEPTEMBER 13 -- UNTIL : FRIDAY SEPTEMBER 19 2014

GENERAL SYNOPSIS
High 1030 hpa, Southern Scandinavia, drifting slowly northeast. Altitude stream getting nil during a fine sunny Sunday, then resuming from the west on Monday, fairly light and dry until Tuesday. It is expected to becoming unsettled and more humid towards the middle of the week depending on a low system approaching west of Biscaye.
SATURDAY EVENING SEPTEMBER 13 - AND OVERNIGHT
Clear skies - cool by dawn
SKY CONDITION : clear or partly cloudy.
PRECIPITATION : none.
WIND - ground level : calm.
WIND - mid mountain : NW -> variable -> S light.
WIND - high mountain : NNE light to moderate.
TEMPERATURE : low +6°C.
ISOTHERM 0°C : 4000 m.
ISOTHERM -10°C : 5500 m.
Same kind of weather over the Upper Aosta Valley and the bordering Valais.
TOMORROW - SUNDAY SEPTEMBER 14
Sunny - cool early in the morning - warm in the afternoon
SKY CONDITION : clear or partly cloudy - some cumulus cloud over the massifs in the afternoon. period of sunshine close to 100%.
PRECIPITATION : none.
WIND - ground level : variable light in the morning - moderate afternoon thermal breeze.
WIND - mid mountain : S -> variable -> NW light.
WIND - high mountain : NNE light to moderate -> variable light.
TEMPERATURE : low +6°C - high +23°C.
ISOTHERM 0°C : 4000 -> 3800 -> 3900 m.
ISOTHERM -10°C : 5500 m.
Same kind of weather over the Upper Aosta Valley and the bordering Valais.
SUNDAY TO MONDAY NIGHT - SEPTEMBER 14 TO 15
Clear skies - or slightly hazy at times - somewhat mild
SKY CONDITION  : clear or partly cloudy - thin high cloud crossing over towards the latter part of the night.
PRECIPITATION : none.
WIND - aloft : variable -> SW light.
TEMPERATURE : low +8°C.
Uncertain.
MONDAY SEPTEMBER 15
Fairly sunny - almost cool at first - warm and slightly unsettled in the afternoon
SKY CONDITION : partly cloudy - high cloud - locally cloudy in the afternoon due to cumulus cloud growth. Period of sunshine close to 80%.
PRECIPITATION : probably none.
WIND - aloft : SW -> W light.
TEMPERATURE : low +8 °C - high +24°C.
Uncertain.
TUESDAY SEPTEMBER 16
Sunny - almost cool in the morning - warm in the afternoon
SKY CONDITION : clear or partly cloudy - locally cloudy in the afternoon due to cumulus cloud growth. Period of sunshine close to 90%.
PRECIPITATION : none.
WIND - aloft : W light to moderate.
TEMPERATURE : low +8°C - high +24°C.
Uncertain.
EXTENDED OUTLOOK UNTIL FRIDAY SEPTEMBER 19

Wednesday : very mild ‑ sunny spells in the morning ‑ shower risk later ‑ very uncertain. Thursday and Friday : increasing instability, although fœhn wind likely in the Valley - very uncertain.

Forecast reliability : fairly good until Sunday ‑ poor thereafter.

ReportsAs a reminder, today in Chamonix, the sun rises at 07:16:08 and goes down at 19:36:12.
45.55 N 6.51 E - Altitude 1040 m
19 September 08:00
Temperature +12°C
Relative humidity 85%
Wind 0 km/h
Sea level pressure 1016 hpa - rising
Pressure at 1042 m 898 mb
Precipitation last 6h 0.0 mm
Skies cloudy - high cloud
Visibility 60000 m
Altitude 3845 m
19 September 08:00
Temperature 0°C
Wind S 10 km/h
Altitude 2250 m
19 September 08:00
Snow depth 0 cm
Wind 10 km/h
Gusts -- km/h
Temperature +9°C