CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST
Eugène Delacroix, La Liberté guidant le peuple
ISSUED AT 20:30 ON SATURDAY JUNE 25, 2016
VALID FROM : SATURDAY JUNE 25 2016 -- UNTIL : FRIDAY JULY 01 2016

GENERAL SYNOPSIS
Altitude low currently whirling over the British Isles is still driving a fairly unstable southwesterly stream over the Western Alps, while the recent thundery disturbance moves away eastward, thanks to the influence of the Azores high ridge which is expected to reaching 1020 hpa at least over Switzeland by Sunday evening. • There is still a slight shower risk persisting in the evening, which will be diminishing over the hours. Skies will beging to clear high up meanwhile, although remaining cloudy in the valley. • Sunny spells will be spreading out on Sunday afternoon in a slightly colder atmosphere than seasonal average. • Fair weather which is expected to setting up on Monday will probably be lasting until the income of a thundery disturbance by Wednesday afternoon.
SATURDAY EVENING JUNE 25 - AND OVERNIGHT
Precipitation ending - skies beginning to clear high up
SKY CONDITION : mostly cloudy - clear breakouts likely high up towards the latter part of the night - persistent cloud in the valley.
PRECIPITATION : latest showers early in the night - dry later.
WIND - ground level : variable light.
WIND - mid mountain : WSW light.
WIND - high mountain : WSW moderate.
TEMPERATURE : low +11°C.
ISOTHERM 0°C : 3900 m.
ISOTHERM -10°C : 5400 m.
Less cloud in the Upper Aosta Valley.
TOMORROW - SUNDAY JUNE 26
Changeable and cooler - sunny spells spreading out during the afternoon
SKY CONDITION : cloudy with patches along the slopes in the morning - sunny spells gradually spreading out later. Period of sunshine close to 50%.
PRECIPITATION : probably none.
WIND - ground level : variable -> SW light.
WIND - mid mountain : WSW light -> SW light to moderate.
WIND - high mountain : WSW -> W moderate.
TEMPERATURE : low +11°C - high +19°C.
ISOTHERM 0°C : 3900 -> 3700 m.
ISOTHERM -10°C : 5400 m.
Sunnier and warmer in the Upper Aosta Valley.
SUNDAY TO MONDAY NIGHT - JUNE 26 TO 27
Clear high up - cloud patches in the valley - somewhat cool
SKY CONDITION  : clear high up - cloud patches sticking to the slopes in the valley.
PRECIPITATION : none.
WIND - aloft : W moderate -> NW light to moderate.
TEMPERATURE : low +8°C.
Uncertain.
MONDAY JUNE 27
Fair weather - cool in the morning ‑ rising highs
SKY CONDITION : clear or partly cloudy - cumulus cloud growing over the slopes in the afternoon. Period of sunshine close to 80%.
PRECIPITATION : none.
WIND - aloft : NW -> WNW light to moderate.
TEMPERATURE : low +8 °C - high +22°C.
Uncertain.
TUESDAY JUNE 28
Fair summer weather ‑ cool in the morning ‑ hot in the afternoon
SKY CONDITION : clear or partly cloudy. Period of sunshine close to 90%.
PRECIPITATION : none.
WIND - aloft : WNW -> WSW light to moderate.
TEMPERATURE : low +8°C - high +26°C.
Uncertain.
EXTENDED OUTLOOK UNTIL FRIDAY JULY 01

Wednesday : sunny morning ‑ becoming mostly cloudy in the afternoon ‑ rainy-thundery disturbance crossing over in the evening or during the following night. Thursday : changeable weather within the disturbance’s tail ‑ sunny spells and showers in turn. Friday : fair summer weather - hot in the afternoon - evening shower slight risk.

Forecast reliability : poor.

ReportsAs a reminder, today in Chamonix, the sun rises at 05:44:50 and goes down at 21:27:07.
45.55 N 6.51 E - Altitude 1040 m
28 June 07:00
Temperature +7°C
Relative humidity 85%
Wind 0 km/h
Sea level pressure 1022 hpa - rising slowly
Pressure at 1042 m 905 mb
Precipitation last 6h 0.0 mm
Skies clear
Visibility 95000 m
Altitude 3845 m
28 June 07:00
Temperature 0°C
Wind W 35 km/h
Altitude 2250 m
28 June 06:00
Snow depth 30 cm
Wind 5 km/h
Gusts 10 km/h
Temperature +7°C