CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
Drunk on flowers
The woman armed with a sword
Wears a man's jacket
ISSUED AT 08:20 FRIDAY SEPTEMBER 21
VALID FROM : FRIDAY SEPTEMBER 21 ‑‑ UNTIL : WEDNESDAY SEPTEMBER 26 2018

GENERAL SYNOPSIS
Azores high ridge which kept the Alps away from the Atlantic low pressure noria is currently collapsing over France. Low "Bronagh", 980 hpa over North Sea this morning, moving east quickly. Linked cold front is expected to crossing over our Region southeastward bound mostly in the evening and in the first par of the night. • Light and scattered precipitation likely, 5 mm at most. Strong wind high up and temperature dropping close to seasonal average. • Azores high ridge push towards the Alps soon thereafter will cause sunny yet somewhat cool improvement on Saturday and Sunday. • Deepening low crossing over quickly, English Channel to Poland, will propel a new disturbance along the northern slopes of the Alpine Range during the night to Monday.
TODAY - FRIDAY SEPTEMBER 21
Sunny morning ‑ becoming mainly cloudy ‑ strong wind high up in the evening
SKY CONDITION : clear to partly cloudy in the morning ‑ thin high cloud crossing over ‑ becoming mostly cloudy from the west over the afternoon hours. Period of sunshine close to 55%.
PRECIPITATION : isolated shower towards the latter part of the afternoon ‑ rain‑snow limit dropping towards 3300 m.
WIND - ground level : SW light ‑> light to moderate.
WIND - mid mountain : SW ‑> WSW moderate.
WIND - high mountain : W moderate ‑> strong.
TEMPERATURE : low +8°C - high +24°C - temperature inversion toward 1800 m early in the morning.
ISOTHERM 0°C : 3900 ‑> 3600 m.
ISOTHERM -10°C : 5500 ‑> 5600 m.
OVERNIGHT
Mainly cloudy with showers, then cloudy ‑ cooler ‑ strong wind high up
SKY CONDITION : mostly cloudy in the first part of the night ‑ becoming cloudy with hazy spells high up ‑ low cloud patches in the valley.
PRECIPITATION : scattered showers in the first part of the night ‑ rain‑snow limit dropping towards 3000 m ‑ ≤ 5 mm water for the whole showery spell.
WIND - aloft : W strong ‑> WNW moderate to strong.
TEMPERATURE : low +8°C.
SATURDAY SEPTEMBER 22
Partly, then fairly sunny ‑ noticeably cooler ‑ fairly strong wind high up
SKY CONDITION : cloudy with hazy sunny spells with high cloud ‑ partly cloudy at times thereafter. Period of sunshine close to 65%.
PRECIPITATION : none.
WIND - aloft : WNW ‑> NW moderate to strong.
TEMPERATURE : low +8 °C - high +21°C.
SUNDAY SEPTEMBER 23
Fairly sunny ‑ getting milder ‑ cloudy deterioration in the evening ‑ windy high up
SKY CONDITION : clear or partly cloudy until the middle of the afternoon ‑ high cloud patches coming in from the west later. Period of sunshine close to 80%.
PRECIPITATION : none.
WIND - aloft : W moderate ‑> moderate to strong.
TEMPERATURE : dropping lows ‑ rising highs.
EXTENDED OUTLOOK UNTIL WEDNESDAY SEPTEMBER 26 2018

Monday : fairly sunny after early morning low cloud dispelling ‑ noticeably cooler ‑ fairly strong NW high up. Tuesday : sunny ‑ seasonable temperature ‑ NNE locally fairly strong high up. Wednesday : fair weather ‑ cold by dawn ‑ barely warm in the afternoon.

Forecast reliability : fairly good until Saturday ‑ poor thereafter.

ReportsAs a reminder, today in Chamonix, the sun rises at 07:18:41 and goes down at 19:32:13.
45.55 N 6.51 E - Altitude 1040 m
September 21 07:00
Temperature +8°C
Relative humidity 89%
Wind 0 km/h
Sea level pressure 1019 hpa - rising slowly
Pressure at 1042 m 902 mb
Precipitation last 6h 0.0 mm
Skies clear
Visibility 70000 m
Altitude 3845 m
September 21 07:00
Temperature -2°C
Wind WSW 30 km/h
Altitude 2250 m
September 21 06:00
Snow depth 0 cm
Wind 20 km/h
Gusts 30 km/h
Temperature +10°C