CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Yosa Buson
An axe strikes
The winter forest—
It smells to me
ISSUED AT 19:40 ON SATURDAY DECEMBER 13, 2014
VALID FROM : SATURDAY DECEMBER 13 -- UNTIL : FRIDAY DECEMBER 19 2014

GENERAL SYNOPSIS
Low 975 hpa, Baltic Lands, moving east. It is extending a frontal trough reaching Spain where a minimum is isolating and then expected to moving slowly towards the Genoa Gulf. Linked disturbance mainly driving cloud over the area in a still fairly strong southwesterly stream, slightly milder than seasonal average, while a light fœhn effect is affecting the northern slopes. Cloud patches should continue to crossing over until Tuesday, possibly triggering light scattered showers each night. The Alps will then edge south of the very unsettled westerlies streaming over Northern Europe. There is a possibility of a disturbance extending more south and therefore carrying moderate precipitation between Wednesday afternoon and Thursday afternoon. To be confirmed.
SATURDAY EVENING DECEMBER 13 - AND OVERNIGHT
Cloudy - slight shower risk - slightly decreasing wind high up
SKY CONDITION : mostly cloudy at first - becoming cloudy with fleeting clear spells towards the latter part of the night.
PRECIPITATIONradarlive precipitation over the Alps : slight shower risk in the first part of the night - dry later.
WIND - ground level : light to moderate - fœhn wind puffs.
WIND - mid mountain : S light to moderate.
WIND - high mountain : SW moderate to strong -> moderate at times.
TEMPERATURE : low +1°C.
ISOTHERM 0°C : 2300 -> 2200 m.
ISOTHERM -10°C : 3900 -> 3800 m.
Uncertain.
ROAD CONDITION  : From Le Fayet to Chamonix and the Mont-Blanc tunnel : no traffic issue. At 06:30, from Chamonix towards Switzerland via the Montets Pass : some black ice patches, currently being salted.
TOMORROW - SUNDAY DECEMBER 14
Changeable - cloudy with sunny spells - becoming overcast later - probably dry
SKY CONDITION : cloudy with sunny spells in the morning - becoming mostly cloudy during the afternoon. period of sunshine close to 45%.
PRECIPITATION : probably none until the evening.
WIND - ground level : variable light.
WIND - mid mountain : S light to moderate -> light.
WIND - high mountain : SW moderate to strong -> moderate.
TEMPERATURE : low +1°C - high +7°C.
ISOTHERM 0°C : 2200 -> 2100 m.
ISOTHERM -10°C : 3800 -> 3700 m.
Uncertain.
SUNDAY TO MONDAY NIGHT - DECEMBER 14 TO 15
Mainly cloudy - snow flurries towards 1700 m
SKY CONDITION  : mostly cloudy to overcast.
PRECIPITATION : very light and scattered - rain-snow limit towards 1700 m, dropping - no cover.
WIND - aloft : SW moderate -> W light to moderate.
TEMPERATURE : low +1°C.
Uncertain.
MONDAY DECEMBER 15
Changeable ‑ mainly cloudy in the morning ‑ some sunny spells later
SKY CONDITION : mostly cloudy - at times cloudy with fleeting sunny spells in the afternoon. Period of sunshine close to 30%.
PRECIPITATION : very light and scattered early in the morning - rain-snow limit towards 1600 m - no cover.
WIND - aloft : W -> SW light to moderate.
TEMPERATURE : low +1 °C - high +6°C.
Uncertain.
TUESDAY DECEMBER 16
Uncertain ‑ often mainly cloudy ‑ some sunny spells ‑ getting colder
SKY CONDITION : mostly cloudy - cloudy with sunny spells at times in the afternoon. Period of sunshine close to 25%.
PRECIPITATION : probably none.
WIND - aloft : variable light -> N moderate to strong.
TEMPERATURE : low +1°C - high +4°C.
Uncertain.
EXTENDED OUTLOOK UNTIL FRIDAY DECEMBER 19

Wednesday : possibly fairly sunny and cold in the morning with strong N wind high up ‑ disturbance crossing over in the afternoon and the following night, which activity is very uncertain by now. Thursday : very uncertain ‑ showers, then sunny spells - northwest by west fairly strong high up. Friday : changeable and milder - sunny spells - shower risk - still windy high up.

Forecast reliability : fairly good until Sunday ‑ poor thereafter.

ReportsAs a reminder, today in Chamonix, the sun rises at 08:10:09 and goes down at 16:49:26.
45.55 N 6.51 E - Altitude 1040 m
19 December 08:00
Temperature +1°C
Relative humidity 100%
Wind 0 km/h
Sea level pressure 1027 hpa - rising slowly
Pressure at 1042 m 906 mb
Precipitation last 6h 0.0 mm
Skies cloudy - low cloud - clear above 1400 m
Visibility 70000 m
Altitude 3845 m
19 December 08:00
Temperature -12°C
Wind NW 40 km/h
Altitude 2250 m
19 December 06:00
Snow depth 5 cm
Wind 10 km/h
Gusts 20 km/h
Temperature +2°C