CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Yosa Buson
Evening glories—
The cat chewing the flower
Has its mind elsewhere
ISSUED AT 19:30 ON THURSDAY APRIL 17, 2014
VALID FROM : THURSDAY APRIL 17 -- UNTIL : WEDNESDAY APRIL 23 2014

GENERAL SYNOPSIS
Noticeable weather patter change : altitude cold low coming in from Scandinavia, reaching Germany by Friday, then France by Saturday. By the same time sequence, deepening low towards 1004 hpa, Genoa Gulf, then moving towards the Balearic Islands. Therefore instability is expected to triggering uncertain Easter condition, locally very changeable and getting cooler until Saturday, but slightly milder thereafter.
THURSDAY EVENING APRIL 17 - AND OVERNIGHT
Clear at first - becoming cloudy later - almost cold
SKY CONDITION : clear or partly cloudy until the latter part of the night - becoming cloudy to mostly cloudy from the north by the end of the night.
PRECIPITATION : none.
WIND - ground level : variable light.
WIND - mid mountain : variable -> NW light.
WIND - high mountain : N -> NW moderate.
TEMPERATURE : low 0°C.
ISOTHERM 0°C : 2600 -> 2200 m.
ISOTHERM -10°C : 4400 -> 4000 m.
Light northerly fœhn wind over the Upper Aosta Valley : means milder.
TOMORROW - FRIDAY APRIL 18
Mainly cloudy - increasing wind high up - showers in the afternoon
SKY CONDITION : mostly cloudy with possible fleeting sunny spell early in the morning - becoming quickly overcast. period of sunshine close to 10%.
PRECIPITATION : showers likely towards the latter part of the afternoon, becoming isolated in the evening - rain-snow limit towards 1800 m, dropping towards 1400 m.
WIND - ground level : variable light.
WIND - mid mountain : NW light -> light to moderate.
WIND - high mountain : NW moderate -> NNW strong.
TEMPERATURE : low +1°C - high +12°C.
ISOTHERM 0°C : 2200 -> 1600 m.
ISOTHERM -10°C : 4000 -> 3400 m.
Northerly fœhn wind over the Upper Aosta Valley : milder with possible sunny spells.
FRIDAY TO SATURDAY NIGHT - APRIL 18 TO 19
Isolated showers at first - becoming partly cloudy
SKY CONDITION  : mostly cloudy in the first part of the night - becoming partly cloudy.
PRECIPITATION : isolated showers early in the night - rain-snow limit towards 1300 m - dry later.
WIND - aloft : NNW strong -> NW moderate to strong.
TEMPERATURE : low +1°C.
Incertain.
SATURDAY APRIL 19
Uncertain - possible sunny spell - shower risk - very cool - windy high up
SKY CONDITION : often mostly cloudy - at times cloudy with sunny spells towards in the morning or towards the middle of the day. Period of sunshine close to 30%.
PRECIPITATION : shower risk, higher in the afternoon - rain-snow limit towards 1200 m, rising.
WIND - aloft : NW moderate to strong -> variable -> WNW moderate to strong.
TEMPERATURE : low +1 °C - high +11°C.
Uncertain.
SUNDAY APRIL 20
Uncertain ‑ probably milder ‑ sunny spells - shower risk
SKY CONDITION : cloudy with sunny spells in the morning - becoming mostly cloudy in the afternoon. Period of sunshine close to 40%.
PRECIPITATION : afternoon shower risk - rain-snow limit towards 1800 m, rising.
WIND - aloft : WSW moderate to strong -> SW moderate.
TEMPERATURE : low +1°C - high +16°C.
Uncertain.
EXTENDED OUTLOOK UNTIL WEDNESDAY APRIL 23 2014

Monday : uncertain ‑ cloudy with sunny spells ‑ late afternoon shower risk. Tuesday : uncertain ‑ cloudy with sunny spells in the morning ‑ showers likely in the afternoon. Wednesday : fairly sunny in the morning - cloudy in the afternoon - probably dry.

Forecast reliability : fairly good until Friday ‑ poor thereafter.

ReportsAs a reminder, today in Chamonix, the sun rises at 06:41:58 and goes down at 20:22:03.
45.55 N 6.51 E - Altitude 1040 m
17 April 08:00
Temperature -1°C
Relative humidity 95%
Wind 0 km/h
Sea level pressure 1021 hpa - falling slowly
Pressure at 1042 m 902 mb
Precipitation last 6h 0.0 mm
Skies clear
Visibility 75000 m
Altitude 3845 m
17 April 08:00
Temperature -11°C
Wind NE 35 km/h
Altitude 2250 m
17 April 08:00
Snow depth 65 cm
Wind 5 km/h
Gusts 10 km/h
Temperature +2°C