CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
The pine wind
Circling around the eaves—
Autumn deepens
ISSUED AT 19:00 ON FRIDAY OCTOBER 31, 2014
VALID FROM : FRIDAY OCTOBER 31 2014 -- UNTIL : THURSDAY NOVEMBER 6 2014

GENERAL SYNOPSIS
High, 1027 hpa over Hungary, drifting slowly east. Sunny condition probably persisting until Monday with temperature above seasonal average. Altitude stream, light at first, is expected to backing southwest on Saturday while a deep and extended low is coming in south of Iceland. It should increase on Sunday and even more on Monday, then back further south on Tuesday, therefore triggering a strong fœhn wind spell over the northern slopes of the Alps. Upcoming disturbance expected to be delayed until Tuesday evening or Wednesday morning. Which outlook is still uncertain by now.
FRIDAY EVENING OCTOBER 31 - AND OVERNIGHT
Partly cloudy - cold by dawn
SKY CONDITION : clear or partly cloudy - thin high cloud at times.
PRECIPITATION : none.
WIND - ground level : variable light.
WIND - mid mountain : variable - S light.
WIND - high mountain : NE light.
TEMPERATURE : low 0°C.
ISOTHERM 0°C : 3300 m.
ISOTHERM -10°C : 5200 m.
Temperature inversion towards 1600 m. Same kind of weather over the Upper Aosta Valley and the bordering Valais.
TOMORROW - SATURDAY NOVEMBER 1
Sunny ‑ cool in the morning - very mild on sunny slopes later
SKY CONDITION : clear or partly cloudy - thin high cloud at times. period of sunshine close to 90%.
PRECIPITATION : none.
WIND - ground level : variable light.
WIND - mid mountain : S -> W light.
WIND - high mountain : NE -> W light.
TEMPERATURE : low 0°C - high +18°C.
ISOTHERM 0°C : 3300 -> 3200 m.
ISOTHERM -10°C : 5200 m.
Same kind of weather over the Upper Aosta Valley and the bordering Valais.
SATURDAY TO SUNDAY NIGHT - NOVEMBER 1 TO 2
Partly cloudy - cold by dawn
SKY CONDITION  : partly cloudy - high cloud at times.
PRECIPITATION : none.
WIND - aloft : W -> SW light.
TEMPERATURE : low 0°C.
Uncertain.
SUNDAY NOVEMBER 2
Fairly sunny ‑ high cloud running over from the south - mild in the afternoon
SKY CONDITION : clear, then partly cloudy - high cloud patches running over from the south in the afternoon. Period of sunshine close to 80%.
PRECIPITATION : none.
WIND - aloft : SW light -> moderate.
TEMPERATURE : low 0 °C - high +18°C.
Possible fœhn wind puffs towards the evening. Uncertain.
MONDAY NOVEMBER 3
Fairly sunny at first ‑ becoming cloudy ‑ fœhn wind increasing to strong - mild
SKY CONDITION : partly cloudy in the morning - becoming cloudy - thickening high cloud running over from the south. Period of sunshine close to 75%.
PRECIPITATION : none.
WIND - aloft : SW moderate to strong.
TEMPERATURE : low +6°C - high +17°C.
Fœhn wind expected to gradually increasing to strong. Uncertain.
EXTENDED OUTLOOK UNTIL THURSDAY NOVEMBER 6

Tuesday : cloudy with fœhn wind, probably strong - rain probably running over from the south towards the evening. Wednesday : very uncertain ‑ heavy precipitation likely over the Aosta Valley ‑ although lighter north of the massif. Thursday : improving cool, temporarily.

Forecast reliability : fairly good until Saturday ‑ poor thereafter.

ReportsAs a reminder, today in Chamonix, the sun rises at 07:13:26 and goes down at 17:18:46.
45.55 N 6.51 E - Altitude 1040 m
1 November 07:00
Temperature 0°C
Relative humidity 100%
Wind 0 km/h
Sea level pressure 1026 hpa - rising slowly
Pressure at 1042 m 905 mb
Precipitation last 6h 0.0 mm
Skies partly cloudy
Visibility 65000 m
Altitude 3845 m
31 October 08:00
Temperature -6°C
Wind -- km/h
Altitude 2250 m
1 November 06:00
Snow depth 0 cm
Wind 5 km/h
Gusts -- km/h
Temperature +7°C