CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
On a mountain path
Something might charm you
A wild violet
ISSUED AT 08:35 THURSDAY JULY 24
VALID FROM : THURSDAY JULY 24 ‑‑ UNTIL : TUESDAY JULY 29 2014

GENERAL SYNOPSIS
Low gradient field with medium pressure setting up over France and the Mediterranean, and ruling for a while, favorable to typical summer condition with diurnal instability : light altitude stream, sunny morning followed by cloudy afternoon with possible thundery shower later, which eventualtity is to be evaluated on a day to day basis. Altitude low over Southern Germany in the morning, driving back thick cloud with showers from the northwest. It is expected to drifting northeast within Friday morning, allowing for a relative sunny improvement.
TODAY - THURSDAY JULY 24
Uncertain ‑ cloudy with sunny spells ‑ afternoon shower risk
SKY CONDITION : mostly cloudy early in the morning and towards the latter part of the afternoon ‑ cloudy with sunny spells at times towards the middle of the day. Period of sunshine close to 40%.
PRECIPITATION : early morning showers ending soon ‑ then probably resuming in the afternoon, although scattered with possible local thunderstorm ‑ rain‑snow limit towards 3400 m.
WIND - ground level : variable light ‑ possible gust if thundery shower.
WIND - mid mountain : mainly W ‑ light.
WIND - high mountain : mainly W ‑ light to moderate.
TEMPERATURE : low +13°C - high +22°C.
ISOTHERM 0°C : 3600 ‑> 3700 ‑> 3600 m.
ISOTHERM -10°C : 5400 m.
OVERNIGHT
Improving ‑ clearing and becoming somewhat cool later
SKY CONDITION : cloudy or locally mostly cloudy at first ‑ becoming clear or partly cloudy.
PRECIPITATION : none.
WIND - aloft : W light to moderate ‑> moderate.
TEMPERATURE : low +9°C.
FRIDAY JULY 25
Fairly sunny ‑ slightly more settled atmosphere ‑ warm in the afternoon
SKY CONDITION : clear or partly cloudy ‑ afternoon cumulus cloud growing over the massifs. Period of sunshine close to 75%.
PRECIPITATION : late afternoon shower risk ‑ rain‑snow limit towards 3400 m.
WIND - aloft : W moderate ‑> WSW light to moderate.
TEMPERATURE : low +8 °C - high +24°C - temperature inversion toward Incertain m early in the morning.
SATURDAY JULY 26
Sultry and unsettled ‑ sunny spells, brighter in the morning ‑ thunderstorm likely
SKY CONDITION : cloudy with sunny spells ‑ more frequent and brighter in the morning. Period of sunshine close to 60%.
PRECIPITATION : thunderstorm, more likely in the afternoon ‑ rain‑snow limit towards 3300 m.
WIND - aloft : NW light to moderate ‑> moderate.
TEMPERATURE : dropping slightly.
EXTENDED OUTLOOK UNTIL TUESDAY JULY 29 2014

Sunday : more stable summer condition ‑ fairly sunny ‑ cumulus cloud over the massifs in the afternoon. Monday and Tuesday : altitude cold drop probably crossing over in the vicinity of the Alps, causing unsettled condition with some sunny spells and frequent showers or possible thunderstorm, locally.

Forecast reliability : poor.

ReportsAs a reminder, today in Chamonix, the sun rises at 06:06:28 and goes down at 21:11:37.
45.55 N 6.51 E - Altitude 1040 m
24 July 08:00
Temperature +13°C
Relative humidity 100%
Wind 0 km/h
Sea level pressure 1014 hpa - falling slowly
Pressure at 1042 m 896 mb
Precipitation last 6h 24.5 mm
Skies overcast - recent shower
Visibility 18000 m
Altitude 3845 m
24 July 08:00
Temperature -3°C
Wind W 20 km/h
Altitude 2250 m
24 July 08:00
Snow depth 0 cm
Wind 10 km/h
Gusts 15 km/h
Temperature +7°C