CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Yosa Buson
Mountain ant—
Seen so clearly
On the white peony
ISSUED AT 08:20 SUNDAY MAY 19
VALID FROM : SUNDAY MAY 19 ‑‑ UNTIL : FRIDAY MAY 24 2019

GENERAL SYNOPSIS
Extended low pressure area with poor dynamics over a large part of Europe, it’s deepest spot 1004 hpa lying over Bavaria this Sunday morning, expected to deepening slightly, then to moving away northeast. Thus, until Monday evening : widespread instability with lots of cloud everywhere that trigger mostly light and scattered showers. Moreover, humidity soaked puffs from the Adriatic Sea drive back thick cloud along the northern slopes of the Alps, from east at first, then northeast by north. • Relative and temporary improvement will follow, Tuesday to Thursday, thanks to increasing distance northeast of the low area, going along with an African originated altitude high pressure ridge development. • Friday : deterioration as a result of a polar air thalweg setup, Iceland to Southern France.
TODAY - SUNDAY MAY 19
Gloomy ‑ isolated shower at first ‑ more continuous rain later
SKY CONDITION : mostly cloudy with possible fleeting sunny spells in the morning ‑ overcast later, with cloud coming back from east. Period of sunshine close to 10%.
PRECIPITATION : light isolated shower in the morning, then more continuous precipitation strip coming back from northeast in the afternoon ‑ more intense over aiguilles Rouges ‑ rain‑snow limit rising up towards 2100 m ‑ expected snowfall towards 2300 m : ± 5 cm.
WIND - ground level : calm ‑> variable light ‑> calm.
WIND - mid mountain : NE light.
WIND - high mountain : E ‑> NE light.
TEMPERATURE : low +7°C - high +11°C.
ISOTHERM 0°C : 2200 ‑> 2400 m.
ISOTHERM -10°C : 4000 ‑> 4100 m.
OVERNIGHT
Overcast, then mostly cloudy ‑ shower passings, locally moderate
SKY CONDITION : overcast, becoming mostly cloudy towards the latter part of the night.
PRECIPITATION : several shower passings, locally moderate towards aiguilles Rouges, until the latter part of the night ‑ rain‑snow limit towards 2000‑2100 m ‑ expected snowfall towards 2300 m : ± 5 cm ‑ temporary lull towards dawn.
WIND - aloft : NE light ‑> light to moderate.
TEMPERATURE : low +7°C.
MONDAY MAY 20
Overcast ‑ light and scattered shower ‑ barely milder
SKY CONDITION : overcast. Period of sunshine close to 0%.
PRECIPITATION : light and scattered shower, possibly more sustained in the afternoon ‑ rain‑snow limit towards 2100‑2200 m.
WIND - aloft : NE ‑> N light to moderate ‑ moderate at times.
TEMPERATURE : low +7 °C - high +12°C.
TUESDAY MAY 21
Starting up to improving ‑ longer lasting sunny spells ‑ probably dry ‑ milder
SKY CONDITION : mostly cloudy in the morning, remaining cloud scarfs ‑ becoming cloudy with sunny spells in the afternoon. Period of sunshine close to 35%.
PRECIPITATION : probably none.
WIND - aloft : variable light ‑> SW light to moderate ‑> WSW light.
TEMPERATURE : rising.
EXTENDED OUTLOOK UNTIL FRIDAY MAY 24 2019

Wednesday : fair sunny spells towards the middle of the day ‑ no precipitation ‑ mild in the afternoon. Thursday : fairly sunny ‑ warm in the afternoon. Friday : disturbance coming in from southwest ‑ afternoon rain and increasing winds high up.

Forecast reliability : poor.

ReportsAs a reminder, today in Chamonix, the sun rises at 05:55:49 and goes down at 21:02:11.
45.55 N 6.51 E - Altitude 1040 m
May 19 07:00
Temperature +7°C
Relative humidity 92%
Wind 0 km/h
Sea level pressure 1003 hpa - falling slowly
Pressure at 1042 m 888 mb
Precipitation last 6h 0.2 mm
Skies mostly cloudy
Visibility 3000 m
Altitude 3845 m
May 19 07:00
Temperature -9°C
Wind E 10 km/h
Altitude 2250 m
May 19 06:00
Snow depth 182 cm
Wind 20 km/h
Gusts 30 km/h
Temperature 0°C