CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
First celebrate
The flowers in your heart
Confined in winter
ISSUED AT 20:00 ON SATURDAY MARCH 28, 2015
VALID FROM : SATURDAY MARCH 28 2015 -- UNTIL : FRIDAY APRIL 03 2015

GENERAL SYNOPSIS
The Azores high still extends a ridge 1022 hpa reaching Western Switzerland this evening, yet weakening. This will allow for a thalweg to force in from Norwegian Sea to Central Europe. There will be a fairly persistent balance between these two opposite systems until the middle of the week. Resulting northwesterly stream, often strong high up is expected to driving a series of disturbances over the Alps. Most active will trigger fairly heavy precipitation over the area between Sunday afternoon and Monday evening. Following should be less and less active as time goes by. Outlook until Easter week-end is still very uncertain by now.
SATURDAY EVENING MARCH 28 - AND OVERNIGHT
Mainly cloudy - intermittent light rain - windy high up
SKY CONDITION : mostly cloudy.
PRECIPITATION : light and scattered - rain-snow limit possibly dropping towards 1400 m, locally - almost no snow cover.
WIND - ground level : variable light.
WIND - mid mountain : NNW light to moderate -> NW light.
WIND - high mountain : NW -> WNW moderate - moderate to strong at times.
TEMPERATURE : low +3°C.
ISOTHERM 0°C : 2100 -> 1800 m.
ISOTHERM -10°C : 4200 -> 4500 m.
Same weather over the bordering Valais and the Upper Aosta Valley.
ROAD CONDITION  : @ 06:30, dry roadways - locally humid.morelive precipitation radar over the Alps
TOMORROW - SUNDAY MARCH 29
Light rain in the morning - increasing later - strong wind high up
SKY CONDITION : mostly cloudy, then overcast - possible fleeting sunny spell early in the morning. period of sunshine close to 15%.
PRECIPITATION : very light and scattered in the morning, becoming continuous and moderate in the afternoon - changeable rain-snow limit between 1500 and 1700 m - expected snwofall towards 2000 m : 25-35 cm.
WIND - ground level : variable light.
WIND - mid mountain : NW light -> W moderate.
WIND - high mountain : WNW moderate -> NW moderate to strong.
TEMPERATURE : low +3°C - high +9°C.
ISOTHERM 0°C : 1800 -> 1900 m.
ISOTHERM -10°C : 4500 -> 3800 m.
Same weather over the bordering Valais and the Upper Aosta Valley.
SUNDAY TO MONDAY NIGHT - MARCH 29 TO 30
Rain becoming heavy - getting slightly milder - windy high up
SKY CONDITION  : overcast.
PRECIPITATION : becoming heavy towards the latter part of the night - rain-snow limit rising up towards 1800 m - expected snwofall towards 2000 m : 40-50 cm.
WIND - aloft : NW moderate to strong -> strong.
TEMPERATURE : low +4°C.
Same weather over the bordering Valais and the Upper Aosta Valley.
MONDAY MARCH 30
Bad northwesterly weather - often fairly heavy precipitation - gale high up
SKY CONDITION : overcast. Period of sunshine close to 0%.
PRECIPITATION : often moderate to heavy - getting lighter towards the middle of the day - rain-snow limit rising up towards 2000 m - expected snwofall towards 2000 m : 30-40 cm.
WIND - aloft : NW strong - at times strong to gale force.
TEMPERATURE : low +4 °C - high +9°C.
Uncertain.
TUESDAY MARCH 31
Some sunny spells towards the middle of the day - evening rain
SKY CONDITION : mostly cloudy early in the morning - sunny spells likely towards noon - becoming overcast towards the latter part of the afternoon. Period of sunshine close to 25%.
PRECIPITATION : resuming towards the end of the afternoon - locally moderate - rain-snow limit towards 2000 m, dropping.
WIND - aloft : WNW strong.
TEMPERATURE : low +4°C - high +13°C.
rain-snow limit might drop towards 1300 m during the following night.
EXTENDED OUTLOOK UNTIL FRIDAY APRIL 03 2015

Wednesday and Thursday : improving ‑ dry ‑ cloudy with sunny spells. Friday : same kind of changeable weather, yet with a rainy deterioration likely in the evening. The NW altitude stream will remain fairly strong or even strong during the three days.

Forecast reliability : fairly good until Monday ‑ poor thereafter.

ReportsAs a reminder, today in Chamonix, the sun rises at 07:12:01 and goes down at 20:00:41.
45.55 N 6.51 E - Altitude 1040 m
1 April 07:00
Temperature +2°C
Relative humidity 60%
Wind SW 15 km/h
Sea level pressure 1027 hpa - rising
Pressure at 1042 m 903 mb
Precipitation last 6h 0.0 mm
Skies partly cloudy
Visibility 35000 m
Altitude 3845 m
1 April 07:00
Temperature -18°C
Wind W 110 km/h
Altitude 2250 m
1 April 06:00
Snow depth 150 cm
Wind 30 km/h
Gusts 50 km/h
Temperature -8°C