CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST
ISSUED AT 17:22 ON WEDNESDAY MAY 16, 2012
VALID FROM : WEDNESDAY MAY 16 -- UNTIL : TUESDAY MAY 22 2012
VALID FROM : WEDNESDAY MAY 16 -- UNTIL : TUESDAY MAY 22 2012
GENERAL SYNOPSIS
High cell 1025 hpa, Southern Ireland to Northern France, drifting over Germany overnight and stopping the cold, unsettled and humid air running over the Northern Alps today. Weakening pressure field on Thursday allows for a low area coming in from the south over Western France. Therefore, after a milder sunny spell on Thursday, a southwesterly to southerly stream is expected to setting up from Friday, unsettled at times. Furthermore, a fœhn wind pattern is likely to setting up during the week-end.
WEDNESDAY EVENING MAY 16 - AND OVERNIGHT
Clear and cold - decreasing wind high up
SKY CONDITION : remaining cloud towards the evening - clearing soon.
PRECIPITATION : none.
WIND - ground level : variable light to moderate.
WIND - mid mountain : mainly N - moderate -> light.
WIND - high mountain : NNW strong -> NW moderate to strong.
TEMPERATURE : low -2°C.
ISOTHERM 0°C : 1600 -> 2600 m.
ISOTHERM -10°C : 3200 -> 4000 m.
Temperature inversion towards 1500 m by dawn. Northerly fœhn wind decreasing in the Aosta Valley.
TOMORROW - THURSDAY MAY 17
Sunny - milder
SKY CONDITION : clear or partly cloudy - high cloud coming in from the west during the afternoon. period of sunshine close to 95%.
PRECIPITATION : none.
WIND - ground level : variable light - afternoon thermal breeze likely.
WIND - mid mountain : variable light.
WIND - high mountain : NW moderate to strong -> W moderate.
TEMPERATURE : low -2°C - high +17°C.
ISOTHERM 0°C : 2600 -> 3400 m.
ISOTHERM -10°C : 4000 -> 4800 m.
Fair day all over the Alps at last….
THURSDAY TO FRIDAY NIGHT - MAY 17 TO 18
Becoming mostly cloudy - mild - possible shower later
SKY CONDITION : partly cloudy at first - high cloud - becoming mostly cloudy from the west.
PRECIPITATION : possible shower towards the end of the night - rain-snow limit towards 2600 m.
WIND - aloft : W -> WSW moderate.
TEMPERATURE : low +7°C.
Uncertain.
FRIDAY MAY 18
Changeable and mild - sunny spells and showers with possible local thunderstorm
SKY CONDITION : mostly cloudy - cloudy with sunny spells at times. Period of sunshine close to 40%.
PRECIPITATION : showers with possible local thunderstorm - rain-snow limit towards 2500 m.
WIND - aloft : WSW moderate.
TEMPERATURE : low +7 °C - high +15°C.
Incertain.
SATURDAY MAY 19
Becoming warm - sunny spells - shower risk - evening fœhn wind likely
SKY CONDITION : cloudy with sunny spells - mostly cloudy at times. Period of sunshine close to 60%.
PRECIPITATION : isolated thundery showers - rain-snow limit towards 3000 m.
WIND - aloft : SW moderate -> SSW moderate to strong.
TEMPERATURE : low +7°C - high +20°C.
Gusty fœhn wind likely in the afternoon or towards the evening.
EXTENDED OUTLOOK UNTIL TUESDAY MAY 22 2012
Sunday : warm - sunny spells - gusty fœhn wind - afternoon shower risk. Monday and Tuesday : rainy - getting gradually colder as time goes by.
Forecast reliability : fairly good until Friday - poor thereafter..
ReportsAs a reminder, today in Chamonix, the sun rises at 05:57:11 and goes down at 21:00:41.
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Chamonix - ville
45.55 N 6.51 E - Altitude 1040 m
16 May 14:00
Temperature +7°C
Relative humidity 56%
Wind NE 15 km/h
Sea level pressure 1019 hpa - rising
Pressure at 1042 m 900 mb
Precipitation last 6h 0 mm
Skies cloudy - isolated showers
Visibility 16000 m
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Aiguille du Midi
Altitude 3845 m
16 May 14:00
Temperature -15°C
Wind WSW 35 km/h
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Aiguilles Rouges
Altitude 2250 m
16 May 05:00
Snow depth 130 cm
Wind 10 km/h
Gusts 25 km/h
Temperature -9°C
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