CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
Withered by winter
One-colored world—
The sound of wind
ISSUED AT 08:05 THURSDAY FEBRUARY 20
VALID FROM : THURSDAY FEBRUARY 20 ‑‑ UNTIL : TUESDAY FEBRUARY 25 2020

GENERAL SYNOPSIS
High ridge, mainly close to 1025, Iberia to Eastern Alps, going along with mild subtropical air push high up, Spain to North Sea. • While being the main factor of fair sunny and mild condition high up, that pattern will bend somewhat down overnight towards the western part of the Alpine Range, allowing for polar air thalweg to reaching Switzerland, then Austria. • Surface pressure field remaining high, linked cold front will do nothing more than some cloudy accumulation along northern slopes of the high massifs towards the latter part of the night. • Thus, weather will remain mostly fair, sunny and unseasonably mild until Monday at least, yet often windy from northwest high up.
TODAY - THURSDAY FEBRUARY 20
Fair weather ‑ mild in the afternoon ‑ windy high up
SKY CONDITION : partly cloudy, then clear ‑ some altostratus cloud patches over the high massifs early in the morning, moving away eastward. Period of sunshine close to 85%.
PRECIPITATION : none.
WIND - ground level : SW light.
WIND - mid mountain : NW light ‑> WSW light to moderate ‑ locally moderate.
WIND - high mountain : NNW moderate to strong ‑> WNW moderate ‑> moderate to strong.
TEMPERATURE : low ‑3°C - high +10°C.
ISOTHERM 0°C : 2000 ‑> 2600 ‑> 2400 m.
ISOTHERM -10°C : 4100 ‑> 4500 m.
ROAD CONDITION  : bare roadways. (Vendredi. 18:30).morelive precipitation radar over the Alps
OVERNIGHT
Cloudy at times ‑ probably dry ‑ strong wind high up
SKY CONDITION : clear in the first part of the night, becoming cloudy ‑ fairly thick median altitude cloud patches crossing over from northwest towards the latter part.
PRECIPITATION : probably none.
WIND - aloft : WNW moderate to strong ‑> W ‑> NW strong.
TEMPERATURE : low ‑2°C.
FRIDAY FEBRUARY 21
Fairly sunny ‑ cold in the morning ‑ getting milder later ‑ decreasing wind
SKY CONDITION : cloudy to partly cloudy, then clear or partly cloudy ‑ remaining cloud patches in the median altitude range, locally fairly thick. Period of sunshine close to 70%.
PRECIPITATION : none.
WIND - aloft : NW strong ‑> moderate to strong ‑> moderate.
TEMPERATURE : low ‑2 °C - high +8°C.
SATURDAY FEBRUARY 22
Fair weather ‑ cold in the morning ‑ mild later ‑ becoming windy high up
SKY CONDITION : clear or partly cloudy. Period of sunshine close to 90%.
PRECIPITATION : none.
WIND - aloft : NW moderate ‑> WNW moderate to strong.
TEMPERATURE : rising highs.
EXTENDED OUTLOOK UNTIL TUESDAY FEBRUARY 25 2020

Sunday : fair weather, very mild in the afternoon ‑ however with strong northwest high up ‑ occasionally cloudy. Monday : fair weather ‑ probably 15°C in the valley during the afternoon ‑ fairly strong west high up at times. Tuesday : Sunny morning ‑ fairly strong northwest high up ‑ cloudy deterioration in the afternoon ‑ some rain drops or snow flurries during the following night.

Forecast reliability : fairly good until Saturday.

ReportsAs a reminder, today in Chamonix, the sun rises at 07:26:48 and goes down at 18:05:38.
45.55 N 6.51 E - Altitude 1020 m
February 20 - 07:00
Temperature -2°C
Relative humidity 90%
Wind NE 5 km/h
Sea level pressure 1022 hpa - rising slowly
Pressure at 1042 m 905 mb
Precipitation last 6h 0.0 mm
Skies partly cloudy - altostratus patches 3700-4200 m - snow depth : 4 cm
Visibility 100000 m
Altitude 3845 m
February 20 - 22:00
Temperature -11°C
Wind NW 50 km/h
Altitude 2250 m
February 20 - 06:00
Snow depth 222 cm
Wind 5 km/h
Gusts -- km/h
Temperature -4°C