CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
First celebrate
The flowers in your heart
Confined in winter
ISSUED AT 18:55 ON SATURDAY JANUARY 24, 2015
VALID FROM : SATURDAY JANUARY 24 -- UNTIL : FRIDAY JANUARY 30 2015

GENERAL SYNOPSIS
Low 1003 hpa, Otranto Channel, drifting east while filling slowly. Azores high ridge, 1025 hpa reaching the Saône Valley this evening, then strengthening quickly back east overnight up to reaching Southeastern Germany. The isobaric lines will get much tighter in-between by Sunday early morning, thus allowing the N stream to increase again to gale force by the same time. While crossing over in a fairly high pressure field, this evening's disturbance will cause no more than light precipitation due to ending early in the night. Fairly sunny, yet cold with a very strong N wind high up on Sunday. Altitude wind is expected to decreasing on Monday while a gradually thicker high cloud will forecast a new disturbance at night. Snowfall might then reach 10 cm in the Valley. The mostly wanted very bad weather is expected to coming in on Thursday and to persisting several days.
SATURDAY EVENING JANUARY 24 - AND OVERNIGHT
Clear spells spreading out with strong wind high up
SKY CONDITION : mainly cloudy - becoming cloudy with clear spells spreading out high up - yet probably remaining locally cloudy in the valley.
PRECIPITATIONradarlive precipitation over the Alps : ending very soon.
WIND - ground level : variable light.
WIND - mid mountain : NW light to moderate -> NE moderate.
WIND - high mountain : N moderate -> NNE gale.
TEMPERATURE : low -5°C.
ISOTHERM 0°C : 400 -> 600 m.
ISOTHERM -10°C : 2400 -> 2100 m.
Evening light precipitation will not get over the bordering Valais nor the Upper Aosta Valley.
ROAD CONDITION  : @ 06:30, roadways locally snow covered while approaching the passes. Light snowfall further expected.morelive precipitation radar over the Alps
TOMORROW - SUNDAY JANUARY 25
Fairly sunny - getting slightly milder in the valley - severe gale high up
SKY CONDITION : clear, high up at first, with persistent cloud patches likely over the slopes in the morning. period of sunshine close to 65%.
PRECIPITATION : none.
WIND - ground level : variable light.
WIND - mid mountain : NE moderate.
WIND - high mountain : NNE severe gale.
TEMPERATURE : low -5°C - high 0°C.
ISOTHERM 0°C : 600 -> 900 m.
ISOTHERM -10°C : 2100 -> 2300 m.
Same kind of weather over the Upper Aosta Valley and the bordering Valais.
SUNDAY TO MONDAY NIGHT - JANUARY 25 TO 26
Clear - very cold by dawn - wind decreasing somewhat high up
SKY CONDITION  : clear or partly cloudy.
PRECIPITATION : none.
WIND - aloft : NNE gale -> strong.
TEMPERATURE : low -8°C.
Uncertain.
MONDAY JANUARY 26
Sunny - bitter cold in the morning ‑ becoming cloudy ‑ wind continues to decrease
SKY CONDITION : clear or partly cloudy in the morning - becoming cloudy from the northwest in the afternoon - becoming quickly overcast in the evening. Period of sunshine close to 60%.
PRECIPITATION : probably starting up towards the evening - light - rain-snow limit towards 600 m, rising up.
WIND - aloft : NNE strong -> N moderate to strong.
TEMPERATURE : low -8 °C - high -1°C.
Uncertain.
TUESDAY JANUARY 27
Snow showers early in the morning ‑ sunny spells later - windy high up
SKY CONDITION : mostly cloudy early in the morning - becoming cloudy with sunny spells. Period of sunshine close to 45%.
PRECIPITATION : snow showers early in the morning - dry later.
WIND - aloft : N -> NNE moderate to strong.
TEMPERATURE : low -4°C - high +2°C.
Uncertain.
EXTENDED OUTLOOK UNTIL FRIDAY JANUARY 30

Wednesday : cloudy with sunny spells, without precipitation ‑ increasing westerly at night. Thursday and Friday : bad northwesterly weather ‑ heavy precipitation likely ‑ rain‑snow limit altitude still very uncertain, might vary between 1200 and 600 m.

Forecast reliability : fairly good until Sunday ‑ poor thereafter.

ReportsAs a reminder, today in Chamonix, the sun rises at 08:00:59 and goes down at 17:29:11.
45.55 N 6.51 E - Altitude 1040 m
26 January 08:00
Temperature -5°C
Relative humidity 90%
Wind 0 km/h
Sea level pressure 1027 hpa - falling slowly
Pressure at 1042 m 903 mb
Precipitation last 6h 0.0 mm
Skies mostly cloudy
Visibility 15000 m
Altitude 3845 m
26 January 07:00
Temperature -21°C
Wind ENE 80 km/h
Altitude 2250 m
26 January 06:00
Snow depth 45 cm
Wind 40 km/h
Gusts 60 km/h
Temperature -10°C