CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Sōma Senshi
Particle
In the winter sun
I d'like to leave
ISSUED AT 08:00 TUESDAY NOVEMBER 21
VALID FROM : TUESDAY NOVEMBER 21 ‑‑ UNTIL : SUNDAY NOVEMBER 26 2017

GENERAL SYNOPSIS
High, 1024‑1023 hpa Spain to Alps, going along with a subtropical altitude high pressure spur, drifting towards the Mediterranean. • Low trough, Baltic Lands to Black Sea, moving away eastward while pivoting counterclockwise. • Northwest currently streaming between those areas of action will decrease while backing west by Wednesday, then southwest. • Mostly sunny until Wednesday, while getting milder. • Above mentioned synoptic change will allow for the Atlantic low pressure series to follow lower latitude tracks. • Wavering fœhn spell, Wednesday to Friday, then disturbance system expected to crossing over our Region during the week‑end, often triggering snowfall below 1000 m.
TODAY - TUESDAY NOVEMBER 21
Sunny ‑ cold in the morning ‑ milder in the afternoon ‑ decreasing wind high up
SKY CONDITION : clear or partly cloudy ‑ thin high cloud at times, frequently in the afternoon. Period of sunshine close to 90%.
PRECIPITATION : none.
WIND - ground level : mainly SW ‑ very light.
WIND - mid mountain : NW light to moderate ‑> NNW ‑> WSW light.
WIND - high mountain : NW moderate to strong ‑> moderate.
TEMPERATURE : low ‑4°C - high +8°C - temperature inversion toward 1600 m early in the morning.
ISOTHERM 0°C : 2500 ‑> 2900 m.
ISOTHERM -10°C : 4600 ‑> 4800 m.
ROAD CONDITION  : @ 06:00, clear and cold, dry roadways. Possible black ice patches due to melted waters re-freezing.morelive precipitation radar over the Alps
OVERNIGHT
Partly cloudy ‑ cold in the valley ‑ rather mild in the median altitude range
SKY CONDITION : clear to partly cloudy ‑ thin high cloud passings continue.
PRECIPITATION : none.
WIND - aloft : NW ‑> WNW moderate.
TEMPERATURE : low ‑4°C - temperature inversion toward 1600 m.
WEDNESDAY NOVEMBER 22
Fair weather, mild in the afternoon ‑ light fœhn likely
SKY CONDITION : clear or partly cloudy. Period of sunshine close to 100%.
PRECIPITATION : none.
WIND - aloft : WNW ‑> SW moderate ‑ light fœhn later.
TEMPERATURE : low ‑3 °C - high +10°C.
THURSDAY NOVEMBER 23
Some cloud passings ‑ mild in the afternoon ‑ windy at times high up
SKY CONDITION : partly cloudy to cloudy ‑ median level to high cloud patches crossing over. Period of sunshine close to 60%.
PRECIPITATION : none.
WIND - aloft : WNW moderate to strong ‑> W moderate.
TEMPERATURE : rising slightly.
EXTENDED OUTLOOK UNTIL SUNDAY NOVEMBER 26 2017

Friday : cloudy ‑ fœhn generated sunny spells in the afternoon ‑ unseasonably mild. Saturday : disturbance crossing over ‑ getting colder ‑ SW strong high up. Sunday : fairly active westerly tail ‑ snow showers ‑ strong W to NW at times high up.

Forecast reliability : Fairly good until Thursday ‑ poor thereafter.

ReportsAs a reminder, today in Chamonix, the sun rises at 07:41:48 and goes down at 16:55:17.
45.55 N 6.51 E - Altitude 1040 m
November 21 07:00
Temperature -4°C
Relative humidity 95%
Wind 0 km/h
Sea level pressure 1020 hpa - rising slowly
Pressure at 1042 m 902 mb
Precipitation last 6h 0.0 mm
Skies clear
Visibility 120000 m
Altitude 3845 m
November 21 07:00
Temperature -6°C
Wind NW 65 km/h
Altitude 2250 m
November 21 06:00
Snow depth 5 cm
Wind 10 km/h
Gusts 15 km/h
Temperature +2°C