CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Masaoka Shiki
A mountain village
Under the piled-up snow
The sound of water
ISSUED AT 08:20 FRIDAY MARCH 24
VALID FROM : FRIDAY MARCH 24 ‑‑ UNTIL : WEDNESDAY MARCH 29 2017

GENERAL SYNOPSIS
Pressure field remains higher than 1020 hpa in the Northwestern Italy. An altitude cold low creates an impressive cloud whirl around the Iberian Peninsula, driving a fairly strong southerly to southeasterly stream high up, causing a barrier effect against the Italian slopes of the High Massifs and allowing for intermittent fœhn wind to blow in the northern valleys. • Cold front, linked to a minimum expected north of the Balearic Islands overnight, will be crossing over the area during the Saturday to Sunday night, triggering locally fairly heavy precipitation. • Easterly backings will then allow for gradual improvement, still humid and cool on Sunday, and probably Sunny and mild on Monday.
TODAY - FRIDAY MARCH 24
Gusty fœhn wind ‑ mild in the valley ‑ overcast and windy in the Massif
SKY CONDITION : mostly cloudy on the whole ‑ fleeting fœhn wind generated sunny spells in the valley. Period of sunshine close to 30%.
PRECIPITATION : dry on the whole ‑ light shower likely to running over from the south at times, however.
WIND - ground level : intermittent moderate fœhn wind from the NE ‑ stronger in the upper valley.
WIND - mid mountain : SSE strong ‑> SE light to moderate.
WIND - high mountain : S moderate to strong ‑> SE light to moderate.
TEMPERATURE : low +6°C - high +14°C.
ISOTHERM 0°C : 2500 ‑> 2900 m.
ISOTHERM -10°C : 3900 ‑> 4200 m.
OVERNIGHT
Fœhn wind ‑ fairly clear outbreaks in the valley ‑ overcast and windy high up
SKY CONDITION : mostly cloudy, then cloudy with hazy sky outbreaks.
PRECIPITATION : probably none.
WIND - aloft : SE light to moderate ‑> moderate to strong ‑ gusty fœhn wind in the valley, locally fairly strong.
TEMPERATURE : low +4°C.
SATURDAY MARCH 25
Sunny spells at first ‑ very mild at time ‑ fœhn wind ending ‑ overcast later
SKY CONDITION : cloudy with fœhn wind generated sunny spells ‑ increasing cloud above the massifs during the afternoon ‑ mostly cloudy to overcast in the evening. Period of sunshine close to 55%.
PRECIPITATION : probably none.
WIND - aloft : SE moderate to strong.
TEMPERATURE : low +4 °C - high +17°C.
SUNDAY MARCH 26
Very uncertain ‑ cool easterly cloud backings with sunny spells and shower risk
SKY CONDITION : mostly cloudy in the morning ‑ becoming cloudy with sunny spells. Period of sunshine close to 40%.
PRECIPITATION : remaining scattered showers in the morning ‑ dry later.
WIND - aloft : ESE moderate ‑> SE light to moderate.
TEMPERATURE : noticeably dropping.
EXTENDED OUTLOOK UNTIL WEDNESDAY MARCH 29 2017

Monday to Wednesday : improving, thanks to the Azores High ‑ fairly sunny, some diurnal instability favoring cloud increase over the massifs in the afternoon ‑ very cool in the morning ‑ very mild later.

Forecast reliability : poor.

ReportsAs a reminder, today in Chamonix, the sun rises at 06:24:24 and goes down at 18:52:10.
45.55 N 6.51 E - Altitude 1040 m
24 march 07:00
Temperature +8°C
Relative humidity 60%
Wind NE 20 km/h
Sea level pressure 1015 hpa - rising slowly
Pressure at 1042 m 900 mb
Precipitation last 6h 0.0 mm
Skies mostly cloudy - fœhn wind in the valley
Visibility 12000 m
Altitude 3845 m
24 march 07:00
Temperature -11°C
Wind SE 60 km/h
Altitude 2250 m
24 march 06:00
Snow depth 130 cm
Wind 15 km/h
Gusts 35 km/h
Temperature +2°C