CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Sōma Senshi
Particle
In the winter sun
I d'like to leave
ISSUED AT 19:00 ON FRIDAY DECEMBER 02, 2016
VALID FROM : FRIDAY DECEMBER 02 -- UNTIL : THURSDAY DECEMBER 08 2016

GENERAL SYNOPSIS
Scottish high toping at 1027 hpa tonight in the vicinity of Edinburgh; it's extension towards the Northern Alps still reaches 1020 hpa; the whole system is drifting slowly east, then will be refocusing towards 1035 hpa west of Black Sea by Monday. • Fair weather will continue to prevail all over the Alpine Range, sustained by a light bise stream. • The altitude air mass being somewhat milder than seasonal average high up, temperature inversions will keep occurring in the deeper valleys, possibly becoming more pronounced during the week-end, with an increasing stratus cloud risk below 1200 m tonight. • This stuck weather pattern contributes to atmospheric pollutants accumulation in the lower air layers.
FRIDAY EVENING DECEMBER 02 - AND OVERNIGHT
Clear high up - temperature inversion - low stratus cloud risk
SKY CONDITION : clear or partly cloudy high up - low cloud or fog patches likely down in the valley.
PRECIPITATION : none.
WIND - ground level : calm.
WIND - mid mountain : NE light -> calm or very light SW.
WIND - high mountain : NW light.
TEMPERATURE : low -4°C.
ISOTHERM 0°C : 3100 -> 2800 m.
ISOTHERM -10°C : 4400 -> 4300 m.
Same kind of weather over the Upper Aosta Valley and the bordering Valais.
ROAD CONDITION  : @ 06:00, dry roadways on the whole.morelive precipitation radar over the Alps
TOMORROW - SATURDAY DECEMBER 03
Fair sunny weather after possible low cloud dispelling - getting slightly colder high up
SKY CONDITION : valley low cloud likely up towards 1100-1200 m in the morning, dispelling under direct sunshine - clear or partly cloudy high up - some high cloud passings, thin from the north, later in the afternoon. Period of sunshine close to 80%.
PRECIPITATION : none.
WIND - ground level : calm - at times SW light.
WIND - mid mountain : calm or very light SW.
WIND - high mountain : NW -> N light.
TEMPERATURE : low -5°C - high +6°C.
ISOTHERM 0°C : 2800 m.
ISOTHERM -10°C : 4300 -> 4200 m.
Same kind of weather over the Upper Aosta Valley and the bordering Valais.
SATURDAY TO SUNDAY NIGHT - DECEMBER 03 TO 04
Clear high up - temperature inversion - low stratus cloud slight risk
SKY CONDITION  : clear or partly cloudy high up - possible low cloud or fog patches down in the valley.
PRECIPITATION : none.
WIND - aloft : N -> variable light.
TEMPERATURE : low -4°C.
Same kind of weather over the Upper Aosta Valley and the bordering Valais.
SUNDAY DECEMBER 04
Morning low stratus cloud dispelling, then sunny
SKY CONDITION : valley stratus cloud likely up towards 1000-1100 m in the morning, dispelling under direct sunshine - clear or partly cloudy high up. Period of sunshine close to 85%.
PRECIPITATION : none.
WIND - aloft : variable -> NE light.
TEMPERATURE : low -3 °C - high +7°C.
Same kind of weather over the Upper Aosta Valley and the bordering Valais.
MONDAY DECEMBER 05
Fair sunny weather - bitter cold at first - mild on sunny slopes in the afternoon
SKY CONDITION : clear or partly cloudy. Period of sunshine close to 95%.
PRECIPITATION : none.
WIND - aloft : E -> NE light.
TEMPERATURE : low -6°C - high +8°C.
Incertain.
EXTENDED OUTLOOK UNTIL THURSDAY DECEMBER 08

Tuesday to Thursday : fair weather ‑ cold mornings in the valley ‑ milder and milder over the afternoons on sunny slopes ‑ upper limit of the stratus cloud should be dropping.

Forecast reliability : fairly good until Sunday ‑ 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