CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
On a mountain path
Something might charm you
A wild violet
ISSUED AT 19:30 ON WEDNESDAY JULY 27, 2016
VALID FROM : WEDNESDAY JULY 27 2016 -- UNTIL : TUESDAY AUGUST 02 2016

GENERAL SYNOPSIS
Low 1003 hpa almost stationary between Shetland and Faroes; while withdrawing over the Atlantic, Azores High ridge allowed for a weak disturbance linked to that low to infiltrate from the west up to the Alps; it is currently moving away still triggering some isoalated thundery showers. • Clearing skies during the night will lead to a fair sunny Thursday, yet still locally cloudy over the massifs in the afternoon. This fair condition will become hot on Friday afternoon thanks to the african altitude high component which will be extending towards the Alpine Range by then. • Further outlook shows a rainy-thundery spell of uncertain activity between Saturday afternoon and Monday morning.
WEDNESDAY EVENING JULY 27 - AND OVERNIGHT
Clearing skies - cool by dawn
SKY CONDITION : locally cloudy at first - becoming clear or partly cloudy.
PRECIPITATION : latest thundery shower in the evening - rain-snow limit towards 3400 m.
WIND - ground level : variable -> SW light.
WIND - mid mountain : W -> WSW light.
WIND - high mountain : W -> WNW light to moderate.
TEMPERATURE : low +10°C.
ISOTHERM 0°C : 3600 -> 3800 m.
ISOTHERM -10°C : 5300 -> 5700 m.
Same weather, somewhat delayed over the Upper Aosta Valley and the bordering Valais. Snow surface refreezing high up : fairly good.
TOMORROW - THURSDAY JULY 28
Fairly sunny - barely cool in the morning - locally cloudy in the afternoon
SKY CONDITION : clear or partly cloudy in the morning - becoming locally cloudy in the afternoon over the massifs. Period of sunshine close to 75%.
PRECIPITATION : none.
WIND - ground level : WSW light - thermal SW moderate at times.
WIND - mid mountain : WSW faible.
WIND - high mountain : WNW light to moderate -> NW moderate.
TEMPERATURE : low +10°C - high +25°C.
ISOTHERM 0°C : 3800 -> 4100 m.
ISOTHERM -10°C : 5700 -> 6000 m.
Brighter and warmer sunshine in the Upper Aosta Valley.
THURSDAY TO FRIDAY NIGHT - JULY 28 TO 29
Clearing skies - increasing wind high up
SKY CONDITION  : clear or partly cloudy after evening cumulus cloud dispelling.
PRECIPITATION : none.
WIND - aloft : NW moderate -> WNW moderate to strong.
TEMPERATURE : low +10°C.
Snow surface re-freezing high up : probably poor.
FRIDAY JULY 29
Fair weather ‑ cool in the morning - hot in the afternoon - windy high up
SKY CONDITION : clear or partly cloudy - scarce cumulus cloud over the slopes in the afternoon. Period of sunshine close to 90%.
PRECIPITATION : none.
WIND - aloft : WNW moderate to strong -> W moderate.
TEMPERATURE : low +10 °C - high +27°C.
Incertain.
SATURDAY JULY 30
Sunny and sultry ‑ thundery deterioration likely in the evening - windy high up
SKY CONDITION : clear or partly cloudy during the main part of the day - becoming mostly cloudy later. Period of sunshine close to 70%.
PRECIPITATION : evening thunderstorm risk.
WIND - aloft : W moderate -> WSW moderate to strong.
TEMPERATURE : low +12°C - high +28°C.
Very uncertain.
EXTENDED OUTLOOK UNTIL TUESDAY AUGUST 02

Sunday : stormy weather ‑ possible sunny spells in the morning ‑ SW high up, strong at times. Monday : changeable ‑ sunny spells and scattered showers in turn ‑ slightly cooler than seasonal average. Tuesday : improving more noticeably - fairly sunny - still cooler than seasonal average - decreasing wind high up.

Forecast reliability : poor.

ReportsAs a reminder, today in Chamonix, the sun rises at 06:11:35 and goes down at 21:06:26.
45.55 N 6.51 E - Altitude 1040 m
27 July 07:00
Temperature +12°C
Relative humidity 87%
Wind 0 km/h
Sea level pressure 1022 hpa - steady
Pressure at 1042 m 904 mb
Precipitation last 6h 0.0 mm
Skies cloudy
Visibility 60000 m
Altitude 3845 m
27 July 07:00
Temperature -2°C
Wind WSW 35 km/h
Altitude 2250 m
27 July 06:00
Snow depth 0 cm
Wind 10 km/h
Gusts -- km/h
Temperature +9°C