CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
On a mountain path
Something might charm you
A wild violet
ISSUED AT 18:55 ON TUESDAY JULY 29, 2014
VALID FROM : TUESDAY JULY 29 2014 -- UNTIL : MONDAY AUGUST 04 2014

GENERAL SYNOPSIS
Low 1006 hpa, Northern Genoa Gulf, combined with an altitude cold drop over Piedmont. The whole system is drifting east-southeast and finally moving away over the Adriatic Sea by Wednesday evening. Linked disturbance affecting the area until Wednesday afternoon, although precipitation should get rare with some sunny spells showing up. Improving on Thursday and Friday, then fairly unsettled southwesterly stream expected to ruling over the week-end.
TUESDAY EVENING JULY 29 - AND OVERNIGHT
Improving slightly - getting milder
SKY CONDITION : mostly cloudy - becoming locally cloudy with clear spell.
PRECIPITATION : scattered showers at first - becoming isolated later - rain-snow limit rising up towards 3400 m.
WIND - ground level : variable light.
WIND - mid mountain : variable light.
WIND - high mountain : ENE light to moderate -> N moderate.
TEMPERATURE : low +10°C.
ISOTHERM 0°C : 3300 -> 3600 m.
ISOTHERM -10°C : 5000 -> 5300 m.
Showers organising randomly over the boundary areas of the three countries.
TOMORROW - WEDNESDAY JULY 30
Mainly cloudy back from the northeast - slight shower risk
SKY CONDITION : mainly cloudy - fleeting sunny spells likely. period of sunshine close to 30%.
PRECIPITATION : slight shower risk, mainly in the afternoon - rain-snow limit towards 3600 m.
WIND - ground level : variable light.
WIND - mid mountain : variable light.
WIND - high mountain : N moderate -> light to moderate.
TEMPERATURE : low +10°C - high +19°C.
ISOTHERM 0°C : 3600 -> 4000 m.
ISOTHERM -10°C : 5300 -> 5700 m.
Uncertain.
WEDNESDAY TO THURSDAY NIGHT - JULY 30 TO 31
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 - aloft : N light to moderate -> NW light.
TEMPERATURE : low +9°C.
Uncertain.
THURSDAY JULY 31
Sunny - cool early in the morning ‑ warm in the afternoon
SKY CONDITION : early morning low cloud likely - besides clear or partly cloudy. Period of sunshine close to 85%.
PRECIPITATION : none.
WIND - aloft : NW light -> W light to moderate.
TEMPERATURE : low +9 °C - high +24°C.
Same kind of weather over the Upper Aosta Valley, except for the possible early morning low cloud patches.
FRIDAY AUGUST 01
Fairly sunny ‑ slight evening thunderstorm risk
SKY CONDITION : clear or partly cloudy in the morning - becoming cloudy with sunny spells in the afternoon. Period of sunshine close to 75%.
PRECIPITATION : evening thunderstorm slight risk - rain-snow limit towards 3600 m.
WIND - aloft : SW light to moderate.
TEMPERATURE : low +11°C - high +26°C.
Uncertain.
EXTENDED OUTLOOK UNTIL MONDAY AUGUST 04 2014

Saturday and Sunday : southwesterly stream increasing somewhat while becoming unsettled over the Alps ‑ morning sunny spells ‑ afternoon thundery showers. Monday : probably sunny and warm.

Forecast reliability : fairly good until Wednesday ‑ 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
29 July 08:00
Temperature +10°C
Relative humidity 95%
Wind 0 km/h
Sea level pressure 1012 hpa - falling slowly
Pressure at 1042 m 893 mb
Precipitation last 6h 3.8 mm
Skies overcast - recent shower
Visibility 6000 m
Altitude 3845 m
29 July 08:00
Temperature -5°C
Wind E 10 km/h
Altitude 2250 m
29 July 08:00
Snow depth 0 cm
Wind 10 km/h
Gusts 15 km/h
Temperature +3°C