CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
On a mountain path
Something might charm you
A wild violet
ISSUED AT 19:25 ON WEDNESDAY JULY 30, 2014
VALID FROM : WEDNESDAY JULY 30 2014 -- UNTIL : TUESDAY AUGUST 05 2014

GENERAL SYNOPSIS
Low system over the Adriatic Sea tonight, moving away towards the Balkans, although still driving fairly thick cloud against the northern slopes. Temporary pressure rise from the west over France triggering sunny improvement on Thursday and a warm summer weather on Friday. Fairly unsettled southwesterly stream expected to ruling over the week-end : short fœhn wind spell on Saturday, then cold front crossing over during the following night and moving away eastward by Sunday afternoon.
WEDNESDAY EVENING JULY 30 - AND OVERNIGHT
Skies clearing - somwhat cool in the valley by dawn
SKY CONDITION : cloudy - becoming clear or partly cloudy high up - persistent cloud patches likely along the slopes.
PRECIPITATION : none.
WIND - ground level : variable light.
WIND - mid mountain : N light.
WIND - high mountain : N light to moderate -> NW light.
TEMPERATURE : low +9°C.
ISOTHERM 0°C : Iso 0 m.
ISOTHERM -10°C : Iso -10 m.
Less cloud with a light northerly fœhn wind over the Aosta Valley.
TOMORROW - THURSDAY JULY 31
Early morning low cloud, then sunny - warm in the afternoon
SKY CONDITION : early morning low cloud, rising up along the slopes - besides clear or partly cloudy. period of sunshine close to 70%.
PRECIPITATION : none.
WIND - ground level : variable light in the morning - moderate afternoon thermal breeze.
WIND - mid mountain : N light -> NW light to moderate.
WIND - high mountain : NW light -> W light to moderate.
TEMPERATURE : low +10°C - high +24°C.
ISOTHERM 0°C : 4200 -> 4300 m.
ISOTHERM -10°C : 5800 m.
Same kind of weather over the Upper Aosta Valley, except for the possible early morning low cloud patches.
THURSDAY TO FRIDAY NIGHT - JULY 31 TO AUGUST 1
Clear - somwhat cool in the Valley by dawn
SKY CONDITION  : clear or partly cloudy.
PRECIPITATION : none.
WIND - aloft : W -> WSW light to moderate.
TEMPERATURE : low +8°C.
Snow surface re-freezing high up : probably poor.
FRIDAY AUGUST 01
Fairly sunny - hot in the afternoon ‑ slight evening thunderstorm risk
SKY CONDITION : clear or partly cloudy in the morning - locally cloudy with sunny spells in the afternoon due to cumulus cloud growth. Period of sunshine close to 75%.
PRECIPITATION : evening thunderstorm slight risk - rain-snow limit towards 3600 m.
WIND - aloft : WSW -> SW light to moderate.
TEMPERATURE : low +8 °C - high +26°C.
Possible evening fœhn wind puffs in the valley.
SATURDAY AUGUST 02
Light fœhn wind with sunny spells at first - disturbance coming in during the afternoon
SKY CONDITION : cloudy with sunny spells in the morning - becoming mostly cloudy later. Period of sunshine close to 45%.
PRECIPITATION : thundery showers starting up during the afternoon - becoming fairly heavy at night - rain-snow limit towards 3500 m, dropping quickly.
WIND - aloft : SW light to moderate -> SSW moderate.
TEMPERATURE : low +13°C - high +24°C.
Fœhn wind in the morning, moderate at times.
EXTENDED OUTLOOK UNTIL TUESDAY AUGUST 05 2014

Sunday : rainy morning ‑ improving slightly in the afternoon - cooler. Monday and Tuesday : sunny and warm - thundery shower risk later on Tuesday.

Forecast reliability : fairly good until Friday ‑ poor thereafter.

ReportsAs a reminder, today in Chamonix, the sun rises at 06:13:17 and goes down at 21:04:36.
45.55 N 6.51 E - Altitude 1040 m
30 July 08:00
Temperature +10°C
Relative humidity 95%
Wind 0 km/h
Sea level pressure 1013 hpa - falling slowly
Pressure at 1042 m 895 mb
Precipitation last 6h 0.0 mm
Skies mostly cloudy
Visibility 35000 m
Altitude 3845 m
30 July 08:00
Temperature -5°C
Wind N 40 km/h
Altitude 2250 m
30 July 08:00
Snow depth 0 cm
Wind 10 km/h
Gusts 15 km/h
Temperature +5°C