CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Takahama Kyoshi
The snake flees—
But the eyes that peered at me
Remain in the weeds
ISSUED AT 07:55 WEDNESDAY SEPTEMBER 28
VALID FROM : WEDNESDAY SEPTEMBER 28 ‑‑ UNTIL : MONDAY OCTOBER 3 2016

GENERAL SYNOPSIS
High 1030 hpa, northeast of Azores to Alps, reinforced high up by a southwesterly subtropical component, refocusing Italy to Black Sea while weakening slightly by Friday. • Fair sunny weather with very mild afternoons high up, great visibility, light northeast high up, gently veering southwest, then increasing on Friday. • Cold front income from the northwest on Saturday is expected to causing a deterioration whose extent is still uncertain for now.
TODAY - WEDNESDAY SEPTEMBER 28
Fair weather ‑ warm afternoon, especially in the median altitude range
SKY CONDITION : clear or partly cloudy ‑ thin high cloud at times, mostly in the afternoon. Period of sunshine close to 90%.
PRECIPITATION : none.
WIND - ground level : variable light ‑ thermal SW light to moderate early in the afternoon.
WIND - mid mountain : NE ‑> variable ‑> NE light.
WIND - high mountain : NE moderate ‑> light to moderate.
TEMPERATURE : low +6°C - high +22°C.
ISOTHERM 0°C : 3900 ‑> 4300 m.
ISOTHERM -10°C : 5500 ‑> 6100 m.
OVERNIGHT
Clear ‑ cool in the valley ‑ mild in the median moutain range
SKY CONDITION : clear or partly cloudy ‑ thin high cloud patches crossing over at first.
PRECIPITATION : none.
WIND - aloft : NE light to moderate ‑> variable light.
TEMPERATURE : low +8°C - temperature inversion toward 1600 m.
THURSDAY SEPTEMBER 29
Fair sunny weather ‑ cool in the morning ‑ warm in the afternoon
SKY CONDITION : clear. Period of sunshine close to 100%.
PRECIPITATION : none.
WIND - aloft : variable light ‑> WSW light to moderate.
TEMPERATURE : low +7 °C - high +24°C - temperature inversion toward 1300 m early in the morning.
FRIDAY SEPTEMBER 30
Fair weather, unseasonably warm, especially in the median altitude range
SKY CONDITION : clear or partly cloudy ‑ cumulus cloud over the massifs in the afternoon. Period of sunshine close to 95%.
PRECIPITATION : none.
WIND - aloft : WSW light to moderate.
TEMPERATURE : steady.
EXTENDED OUTLOOK UNTIL MONDAY OCTOBER 3 2016

Saturday : partly sunny morning ‑ slightly cooler high up, thus somewhat unstable ‑ showers likely in the afternoon, towards the evening and during the following night. Sunday : remaining shower in the morning ‑ sunny spells in the afternoon ‑ southwest to northwest high up, fairly strong at times. Monday : fairly sunny ‑ very mild in the afternoon. Still uncertain for the three days.

Forecast reliability : fairly good until Friday ‑ poor thereafter.

ReportsAs a reminder, today in Chamonix, the sun rises at 07:29:25 and goes down at 19:15:40.
45.55 N 6.51 E - Altitude 1040 m
28 September 07:00
Temperature +6°C
Relative humidity 85%
Wind 0 km/h
Sea level pressure 1031 hpa - rising slowly
Pressure at 1042 m 912 mb
Precipitation last 6h 0.0 mm
Skies clear
Visibility 90000 m
Altitude 3845 m
28 September 07:00
Temperature -2°C
Wind NE 15 km/h
Altitude 2250 m
28 September 06:00
Snow depth 0 cm
Wind 0 km/h
Gusts 5 km/h
Temperature +5°C