CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
On a mountain path
Something might charm you
A wild violet
ISSUED AT 17:45 ON SATURDAY AUGUST 30, 2014
VALID FROM : SATURDAY AUGUST 30 2014 -- UNTIL : FRIDAY SEPTEMBER 05 2014

GENERAL SYNOPSIS
Low 1004 hpa, east of Scotland, drifting slightly east while filling. Weak Azores high ridge, reaching Western Switzerland, withdrawing west. Scottish low isolating as an altitude cold drop over North Sea, then heading south and 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 on Monday and during the following night. Mild high pattern probably ruling for a few days thereafter.
SATURDAY EVENING AUGUST 30 - AND OVERNIGHT
Clear skies, becoming hazy - fairly mild
SKY CONDITION : clear until the middle of the night - becoming partly cloudy - high cloud crossing over.
PRECIPITATION : none.
WIND - ground level : variable light.
WIND - mid mountain : mainly N - light.
WIND - high mountain : W -> WNW moderate.
TEMPERATURE : low +10°C.
ISOTHERM 0°C : 3700 -> 3500 m.
ISOTHERM -10°C : 5300 m.
Same kind of weather over the Upper Aosta valley.
TOMORROW - SUNDAY AUGUST 31
Partly sunny ‑ mild in the valley - increasing wind high up
SKY CONDITION : partly cloudy in the morning - thickening high cloud - probably mostly cloudy in the evening. period of sunshine close to 50%.
PRECIPITATION : probably no precipitation before the evening.
WIND - ground level : variable light.
WIND - mid mountain : N light -> NW light to moderate.
WIND - high mountain : WNW moderate -> NW moderate to strong.
TEMPERATURE : low +10°C - high +22°C.
ISOTHERM 0°C : 3500 -> 3200 m.
ISOTHERM -10°C : 5300 -> 5000 m.
Uncertain.
SUNDAY TO MONDAY NIGHT - AUGUST 31 TO SEPTEMBER 1ST
NW disturbance crossing over - getting colder - gale high up
SKY CONDITION  : mostly cloudy to overcast - probably becoming cloudy with clear spells by the end of the night.
PRECIPITATION : showers in the first part of the night, with possible local thunderstorm - becoming light and scattered - rain-snow limit towards 2500 m, dropping towards 2200 m.
WIND - aloft : NW moderate to strong -> N strong to gale force.
TEMPERATURE : low +7°C.
Uncertain.
MONDAY SEPTEMBER 1ST
Fairly sunny - cool in the morning - strong N wind high up
SKY CONDITION : partly cloudy or cloudy with sunny spells at times. Period of sunshine close to 80%.
PRECIPITATION : none.
WIND - aloft : N strong to gale force -> strong.
TEMPERATURE : low +7 °C - high +19°C.
Uncertain.
TUESDAY SEPTEMBER 2
Fine sunny weather ‑ quickly decreasing N wind high up
SKY CONDITION : clear or partly cloudy. Period of sunshine close to 95%.
PRECIPITATION : none.
WIND - aloft : NNW moderate to strong -> NW moderate.
TEMPERATURE : low +6°C - high +21°C.
Uncertain.
EXTENDED OUTLOOK UNTIL FRIDAY SEPTEMBER 5

Wednesday and Thursday : sunny - cool in the morning ‑ warm in the afternoon. Friday : some diurnal instability - sunny - warm in the afternoon with increasing cloud and evening shower likely over the massifs.

Forecast reliability : poor.

ReportsAs a reminder, today in Chamonix, the sun rises at 06:55:02 and goes down at 20:09:08.
45.55 N 6.51 E - Altitude 1040 m
2 September 08:00
Temperature +5°C
Relative humidity 95%
Wind 0 km/h
Sea level pressure 1020 hpa - steady
Pressure at 1042 m 900 mb
Precipitation last 6h 0.0 mm
Skies clear
Visibility 70000 m
Altitude 3845 m
2 September 08:00
Temperature -6°C
Wind N 40 km/h
Altitude 2250 m
2 September 08:00
Snow depth 0 cm
Wind 20 km/h
Gusts 30 km/h
Temperature +6°C