CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST
Eugène Delacroix, La Liberté guidant le peuple
ISSUED AT 20:50 ON SATURDAY MAY 28, 2016
VALID FROM : SATURDAY MAY 28 2016 -- UNTIL : FRIDAY JUNE 03 2016

GENERAL SYNOPSIS
Fairly low area (1007-1010 hpa) extending from the far southwest of Ireland, over France, up to the Austrian Alps, driving a fairly strong unsettled and warm southwesterly to westerly stream high up, Iberia to Poland. • It is currently refocusing over Central-Western France and is about to drifting further over Germany while deepening slightly by Sunday noon, while propelling a cool and humid air mass around it's western flank up to the Western Alps. • This will trigger a considerable deterioration towards the latter part of the night, with some local thunderstorm outbreaks at first. • Gloomy condition setting up by then will be ruling Sunday and probably keeping on at least until Monday, although possibly improving slightly later.
SATURDAY EVENING MAY 28 - AND OVERNIGHT
Dry, mild and cloudy at first - rainy deterioration later - decreasing wind high up
SKY CONDITION : cloudy to partly cloudy after late afternoon fat cumulus cloud dispelling - becoming mostly cloudy from the south-southwest towards the middle of the night - fleeting clear spells likely towards dawn.
PRECIPITATION : expected thundery shower or thunderstorm passing towards the middle of the night - light scatterd shower thereafter - rain-snow limit towards 3000 m, dropping.
WIND - ground level : NE -> variable light ‑ fœhn wind trend at times - possible thunderstorm gust.
WIND - mid mountain : variable light to moderate ‑ SW at times.
WIND - high mountain : SW moderate to strong -> SSW light to moderate.
TEMPERATURE : low +10°C.
ISOTHERM 0°C : 3500 -> 3200 m.
ISOTHERM -10°C : 5000 -> 4600 m.
Very uncertain.
TOMORROW - SUNDAY MAY 29
Gloomy weather with thunderstorm risk setting up - moderate rain - getting colder
SKY CONDITION : mostly cloudy - fleeting sunny spell likely early in the morning. Period of sunshine close to 25%.
PRECIPITATION : light isolated shower early in the morning - moderate rain later - fairly heavy at times in the first part of the afternoon - rain-snow limit towards 2700 m, dropping towards 2300 m - expected snowfall towards 2800 m : 20-30 cm.
WIND - ground level : variable faible.
WIND - mid mountain : NE light -> SW moderate.
WIND - high mountain : SSW light to moderate -> S light.
TEMPERATURE : low +10°C - high +15°C.
ISOTHERM 0°C : 3200 -> 2700 m.
ISOTHERM -10°C : 4600 -> 4500 m.
Very uncertain.
SUNDAY TO MONDAY NIGHT - MAY 29 TO 30
Rainy - cooler
SKY CONDITION  : mostly cloudy to overcast.
PRECIPITATION : continuous - mostly light at first - getting heavier towards the end of the night - rain-snow limit towards 2200 m - expected snowfall towards 2800 m : 5-10 cm.
WIND - aloft : S -> SW faible.
TEMPERATURE : low +8°C.
Very uncertain.
MONDAY MAY 30
Unsettled - often mainly cloudy - moderate shower in the morning
SKY CONDITION : often mostly cloudy - fleeting sunny spells likely in the afternoon. Period of sunshine close to 25%.
PRECIPITATION : moderate shower in the morning, becoming light and scattered - rain-snow limit towards 2300 m - expected snowfall towards 2500 m : 5-10 cm.
WIND - aloft : SW -> SSW light to moderate.
TEMPERATURE : low +8 °C - high +15°C.
Very uncertain.
TUESDAY MAY 31
Cool and cloudy - some sunny spells ‑ some showers
SKY CONDITION : mostly cloudy or cloudy with sunny spells at times. Period of sunshine close to 35%.
PRECIPITATION : afternoon isolated shower likely - rain-snow limit towards 2400 m.
WIND - aloft : SW -> SSW light to moderate.
TEMPERATURE : low +7°C - high +15°C.
Very uncertain.
EXTENDED OUTLOOK UNTIL FRIDAY JUNE 03 2016

Wednesday and Thursday : sunny spells gradually spreading ‑ getting milder ‑ dry. Friday : fairly sunny - warm in the afternoon. Very uncertain.

Forecast reliability : poor.

ReportsAs a reminder, today in Chamonix, the sun rises at 05:45:30 and goes down at 21:15:10.
45.55 N 6.51 E - Altitude 1040 m
31 May 07:00
Temperature +9°C
Relative humidity 93%
Wind 0 km/h
Sea level pressure 1013 hpa - rising slowly
Pressure at 1042 m 893 mb
Precipitation last 6h 1.0 mm
Skies overcast - light rain
Visibility 3500 m
Altitude 3845 m
31 May 07:00
Temperature -10°C
Wind WSW 35 km/h
Altitude 2250 m
31 May 06:00
Snow depth 195 cm
Wind 30 km/h
Gusts 45 km/h
Temperature 0°C