CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
While dawn appears
Swirling in fog eddies
The bell clears its voice
ISSUED AT 08:25 WEDNESDAY APRIL 1
VALID FROM : WEDNESDAY APRIL 1 ‑‑ UNTIL : MONDAY APRIL 6 2020

GENERAL SYNOPSIS
High 1042 far west of Ireland, moving away while weakening, yet extending 1020 ridge up to Northern Alps, which is currently weakening as well. • This Wednesday will be mostly sunny after dispelling of some early morning fog patches in the southwest lower part of the valley. • Further weakening of pressure will lead to isobaric neck over Alpine Regions on Thursday, favouring diurnal instability. • Then fair will resume with new high inflating in the Bay of Biscaye by Friday, which will then proceed towards Central Europe on Saturday, reinforced by little African originated altitude spur. • Resulting fair sunny condition might therefore become warm on Sunday and Monday, thanks to light foehn trend.
TODAY - WEDNESDAY APRIL 1
Sunny ‑ cold in the morning ‑ mild on sunny slopes later
SKY CONDITION : fog toping towards 1100‑1200 m in the southwest part of the valley, dispelling soon ‑ else, clear or partly cloudy with some cumulus cloud growth in the afternoon. Period of sunshine close to 85%.
PRECIPITATION : none.
WIND - ground level : calm ‑> variable light ‑ occasionally SW, early afternoon.
WIND - mid mountain : mainly W ‑ light.
WIND - high mountain : NNW light to moderate ‑> NW light.
TEMPERATURE : low ‑1°C - high +11°C.
ISOTHERM 0°C : 1700 ‑> 2000 ‑> 1900 m.
ISOTHERM -10°C : 3900 m.
OVERNIGHT
Partly cloudy skies ‑ slightly milder in the median altitude range
SKY CONDITION : clear or partly cloudy ‑ fog patches still possible here and there.
PRECIPITATION : none.
WIND - aloft : NW ‑> WNW light ‑ occasionally light to moderate.
TEMPERATURE : low ‑1°C.
THURSDAY APRIL 2
Fairly sunny ‑ locally cloudy with sunny spells in the afternoon
SKY CONDITION : clear or partly cloudy in the morning ‑ some fairly high cloud patches crossing over ‑ cumulus cloud growing over the slopes in the afternoon. Period of sunshine close to 75%.
PRECIPITATION : none.
WIND - aloft : WNW ‑> NW light ‑ occasionally light to moderate.
TEMPERATURE : low ‑2 °C - high +12°C.
FRIDAY APRIL 3
Fairly sunny ‑ locally cloudy with sunny spells ‑ getting slightly milder
SKY CONDITION : partly cloudy on the whole ‑ some fairly high cloud patches crossing over ‑ cumulus cloud growing over the slopes in the afternoon. Period of sunshine close to 75%.
PRECIPITATION : none.
WIND - aloft : N ‑> NNW moderate.
TEMPERATURE : slightly rising highs.
EXTENDED OUTLOOK UNTIL MONDAY APRIL 6 2020

Saturday : fair weather ‑ very mild in the afternoon. Sunday : fair weather ‑ almost warm on sunny slopes in the afternoon. Monday : sunny ‑ warm afternoon in the valley with fœhn puffs.

Forecast reliability : fairly good until Thursday.

ReportsAs a reminder, today in Chamonix, the sun rises at 07:10:31 and goes down at 20:01:43.
45.55 N 6.51 E - Altitude 1020 m
April 1 - 08:00
Temperature 0°C
Relative humidity 90%
Wind 0 km/h
Sea level pressure 1016 hpa - falling slowly
Pressure at 1042 m 899 mb
Precipitation last 6h 0.0 mm
Skies partly cloudy - clear above 1200 m
Visibility 80000 m
Altitude 3845 m
April 1 - 08:00
Temperature -11°C
Wind N 10 / 30 km/h
Altitude 2250 m
April 1 - 06:00
Snow depth 262 cm
Wind 10 km/h
Gusts 15 km/h
Temperature -5°C