CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Sōma Senshi
Particle
In the winter sun
I d'like to leave
ISSUED AT 07:55 FRIDAY DECEMBER 9
VALID FROM : FRIDAY DECEMBER 9 ‑‑ UNTIL : WEDNESDAY DECEMBER 14 2016

GENERAL SYNOPSIS
Pressure field continues to show figures well above 1030 hpa over the Mediterranean Basin and the Alpine Range. This surface high pattern is being intensified due to the extension of an altitude subtropical mild air high ridge, Canary Islands to Central Alps, acting as a dome which blocks atmospheric exchanges, therefore increasing pollutants accumulation at lower altitudes and in the narrow mountain valleys as well, where cold air lakes remain stagnating. • Temperatures kept positive at 2000 m and above even at night. • Pressures possibly weakening somewhat on Saturday might allow for an inactive cold front to infiltrating from the north towards the Alps.
TODAY - FRIDAY DECEMBER 9
Sunny with temperature inversion ‑ mild afternoon in the median altitude range
SKY CONDITION : clear or partly cloudy ‑ thin high cloud crossing over. Period of sunshine close to 90%.
PRECIPITATION : none.
WIND - ground level : variable very light or nil.
WIND - mid mountain : NE light ‑ calm at times.
WIND - high mountain : N light to moderate ‑> NW light.
TEMPERATURE : low ‑6°C - high +8°C - temperature inversion toward 1200 m early in the morning.
ISOTHERM 0°C : 3500 ‑> 3700 m.
ISOTHERM -10°C : 5200 ‑> 5100 m.
ROAD CONDITION  : @ 06:00, dry roadways on the whole.morelive precipitation radar over the Alps
OVERNIGHT
Clear skies ‑ bitter cold in the valley ‑ fairly mild in the median altitude range
SKY CONDITION : skies clearing completely early in the night.
PRECIPITATION : none.
WIND - aloft : NW light.
TEMPERATURE : low ‑5°C - temperature inversion toward 1300 m.
SATURDAY DECEMBER 10
Fair weather ‑ cold morning in the valley ‑ mild on sunny slopes in the afternoon
SKY CONDITION : clair. Period of sunshine close to 100%.
PRECIPITATION : none.
WIND - aloft : NW light ‑> W light to moderate.
TEMPERATURE : low ‑6 °C - high +9°C - temperature inversion toward 1200 m early in the morning.
SUNDAY DECEMBER 11
Fairly sunny ‑ some cloud patches crossing over in the afternoon ‑ getting colder
SKY CONDITION : clear or partly cloudy in the morning ‑ partly cloudy to cloudy in the afternoon ‑ coming in from the northwest. Period of sunshine close to 80%.
PRECIPITATION : none.
WIND - aloft : WNW ‑> NNW moderate ‑ at times moderate to strong.
TEMPERATURE : dropping slightly.
EXTENDED OUTLOOK UNTIL WEDNESDAY DECEMBER 14 2016

Monday : fairly sunny ‑ cooling trend continues, especially high up. Tuesday and Wednesday : sunny ‑ trend might be inverting and cause milder atmosphere in the median altitude range.

Forecast reliability : fairly good until Saturday ‑ poor thereafter.

ReportsAs a reminder, today in Chamonix, the sun rises at 08:03:51 and goes down at 16:47:33.
45.55 N 6.51 E - Altitude 1040 m
9 December 08:00
Temperature -6°C
Relative humidity 80%
Wind 0 km/h
Sea level pressure 1032 hpa - steady
Pressure at 1042 m 914 mb
Precipitation last 6h 0.0 mm
Skies clear
Visibility 120000 m
Altitude 3845 m
9 December 07:00
Temperature -5°C
Wind NNW 30 km/h
Altitude 2250 m
9 December 06:00
Snow depth 10 cm
Wind 10 km/h
Gusts 15 km/h
Temperature +5°C