CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
On a mountain path
Something might charm you
A wild violet
ISSUED AT 18:50 ON FRIDAY AUGUST 29, 2014
VALID FROM : FRIDAY AUGUST 29 2014 -- UNTIL : THURSDAY SEPTEMBER 04 2014

GENERAL SYNOPSIS
Low 998 hpa, Northern Scotland, drifting slightly east while filling slowly. Linked cold front, fairly active over the massifs, currently crossing over the area, then followed by a moderately unsettled tail until Saturday. The cold air, going along with the low high up, is expected to isolating as an altitude cold drop over North Sea by Saturday evening, then to heading south and to crossing over Eastern Switzerland during the Sunday to Monday night. A short unsettled spell is therfore likely on Sunday evening, followed by a fairly strong N wind period until Tuesday morning. Long-lasting and mild high pattern probably setting up thereafter.
FRIDAY EVENING AUGUST 29 - AND OVERNIGHT
Still mainly cloudy - showers ending
SKY CONDITION : mostly cloudy in the first part of the night, then clear spells spreading out - persistent cloud patches along the slopes.
PRECIPITATION : scattered showers although with possible local thunderstorm, becoming isolated in the first part of the night - rain-snow limit towards 3300 m - dry later.
WIND - ground level : variable light.
WIND - mid mountain : NW -> N light.
WIND - high mountain : W moderate.
TEMPERATURE : low +11°C.
ISOTHERM 0°C : 3600 m.
ISOTHERM -10°C : 5400 m.
Same kind of weather over the Upper Aosta Valley and the bordering Switzerland.
TOMORROW - SATURDAY AUGUST 30
Changeable and mild - cloudy with hazy sunny spells - no precipitation
SKY CONDITION : locally mostly cloudy early in the morning due to low cloud - otherwise hazy skies, at times fairly thick - becoming partly cloudy towards the evening. period of sunshine close to 50%.
PRECIPITATION : probably none.
WIND - ground level : variable light.
WIND - mid mountain : N light -> NW light to moderate.
WIND - high mountain : W moderate.
TEMPERATURE : low +11°C - high +22°C.
ISOTHERM 0°C : 3600 -> 3800 m.
ISOTHERM -10°C : 5400 m.
Same kind of weather over the Upper Aosta Valley and the bordering Switzerland. Somewhat uncertain.
SATURDAY TO SUNDAY NIGHT - AUGUST 30 TO 31
Hazy skies - fairly mild
SKY CONDITION  : partly cloudy - high cloud crossing over.
PRECIPITATION : none.
WIND - aloft : W -> NW moderate.
TEMPERATURE : low +10°C.
Uncertain.
SUNDAY AUGUST 31
Partly sunny ‑ mild in the valley ‑ increasing N wind high up
SKY CONDITION : partly cloudy in the morning - high cloud - becoming cloudy with sunny spells in the afternoon - possibly mostly cloudy in the evening. Period of sunshine close to 65%.
PRECIPITATION : mainly dry - rainy-thundery strip possibly crossing over in the evening, mainly towards east.
WIND - aloft : NW moderate -> NNW moderate to strong.
TEMPERATURE : low +10 °C - high +22°C.
Uncertain.
MONDAY SEPTEMBER 01
Sunny - cool in the morning - mild in the afternoon ‑ strong N wind high up
SKY CONDITION : clear or partly cloudy. Period of sunshine close to 90%.
PRECIPITATION : none.
WIND - aloft : N strong to gale force -> strong.
TEMPERATURE : low +8°C - high +20°C.
Incertain.
EXTENDED OUTLOOK UNTIL THURSDAY SEPTEMBER 04 2014

Tuesday : sunny and mild ‑ quickly decreasing N wind high up. Wednesday and Thursday : sunny ‑ warm in the afternoon.

Forecast reliability : fairly good until Saturday ‑ poor thereafter.

ReportsAs a reminder, today in Chamonix, the sun rises at 06:51:19 and goes down at 20:14:45.
45.55 N 6.51 E - Altitude 1040 m
29 August 08:00
Temperature +12°C
Relative humidity 100%
Wind 0 km/h
Sea level pressure 1020 hpa - steady
Pressure at 1042 m 902 mb
Precipitation last 6h 0.0 mm
Skies cloudy
Visibility 40000 m
Altitude 3845 m
29 August 08:00
Temperature -4°C
Wind WSW 50 km/h
Altitude 2250 m
29 August 08:00
Snow depth 0 cm
Wind 25 km/h
Gusts 40 km/h
Temperature +9°C