CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Iida Dakotsu
All in calmness—
The earth with half-opened eyes
Moves into the winter
ISSUED AT 08:10 FRIDAY NOVEMBER 28
VALID FROM : FRIDAY NOVEMBER 28 ‑‑ UNTIL : WEDNESDAY DECEMBER 3 2014

GENERAL SYNOPSIS
Low 978 hpa over Northern Portugal, drifting towards the Gibraltar strait entrance by Saturday morning. It is driving a strong and humid air stream from the Mediterranean to the Alps going along with a fœhn wind effect over the northern slopes, at times fairly strong today. It is then expected to drifting over the Balearic Islands on Sunday, and further over the Genoa Gulf by Monday, causing the altitude stream to backing east, then northeast and going along with a gradual temperature drop next week. No significant precipitation over the Northern Alps until then.
TODAY - FRIDAY NOVEMBER 28
Cloudy with hazy sunny spells ‑ fœhn wind, strong at times ‑ very mild
SKY CONDITION : cloudy with hazy sunny spells due to high cloud crossing over. Period of sunshine close to 45%.
PRECIPITATION : none.
WIND - ground level : moderate to strong fœhn wind ‑ strong at times towards the middle of the day.
WIND - mid mountain : SE light to moderate.
WIND - high mountain : S moderate to strong ‑ strong at times.
TEMPERATURE : low +9°C - high +15°C.
ISOTHERM 0°C : 2800 ‑> 3200 ‑> 3000 m.
ISOTHERM -10°C : 4300 ‑> 4500 ‑> 4400 m.
OVERNIGHT
Cloudy ‑ very mild ‑ decreasing fœhn wind
SKY CONDITION : cloudy ‑ high and mid‑level cloud crossing over from the south ‑ at times mostly cloudy towards the latter part or the night.
PRECIPITATION : none.
WIND - aloft : S moderate ‑> SSE light to moderate ‑ fœhn wind becoming light to moderate in the valley.
TEMPERATURE : low +8°C.
SATURDAY NOVEMBER 29
Hazy sunshine ‑ decreasing fœhn wind ‑ noticeably milder than seasonal average
SKY CONDITION : partly cloudy or cloudy at times ‑ high cloud. Period of sunshine close to 60%.
PRECIPITATION : none.
WIND - aloft : SSE light to moderate ‑ vanishing fœhn wind in the valley.
TEMPERATURE : low +8 °C - high +13°C.
SUNDAY NOVEMBER 30
Uncertain ‑ cloudy to mostly cloudy ‑ light NE wind ‑ still mild
SKY CONDITION : mostly cloudy ‑ at times cloudy with sunny spells. Period of sunshine close to 35%.
PRECIPITATION : probably none.
WIND - aloft : variable ‑> NE light.
TEMPERATURE : dropping lows.
EXTENDED OUTLOOK UNTIL WEDNESDAY DECEMBER 3 2014

Monday : changeable ‑ cloudy with sunny spells ‑ shower risk ‑ very uncertain. Tuesday and Wednesday : becoming fairly sunny ‑ slightly increasing NE wind high up ‑ getting colder.

Forecast reliability : fairly good until Saturday ‑ poor thereafter.

ReportsAs a reminder, today in Chamonix, the sun rises at 07:50:26 and goes down at 16:50:46.
45.55 N 6.51 E - Altitude 1040 m
28 November 08:00
Temperature +9°C
Relative humidity 60%
Wind NE 20 km/h
Sea level pressure 1008 hpa - falling slowly
Pressure at 1042 m 887 mb
Precipitation last 6h 0.0 mm
Skies mostly cloudy - moderate fœhn wind
Visibility 35000 m
Altitude 3845 m
28 November 08:00
Temperature -12°C
Wind S 70 km/h
Altitude 2250 m
28 November 06:00
Snow depth 0 cm
Wind 15 km/h
Gusts 20 km/h
Temperature +3°C