CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Takahama Kyoshi
The snake flees—
But the eyes that peered at me
Remain in the weeds
ISSUED AT 07:25 SATURDAY MAY 27
VALID FROM : SATURDAY MAY 27 ‑‑ UNTIL : THURSDAY JUNE 1 2017

GENERAL SYNOPSIS
The high pressure bubble has been drifting east, Baltic area to Austria, reaching 1022 hpa and still inflated by an african originated warm air altitude ridge. • Almost no flow towards it’s center. This system is acting as a protective dome over the Alps. • However, a minimum towards Southwestern England might be driving a weak instability wave north of our Region fairly early in the afternoon, thus possibly allowing for an isolated thunderstrom after a fair summer‑like morning. • Slight pressure rise north of the Alpine Range on Sunday might reduce the afternoon storm risk to none. • While moving further eastward on Monday and Tuesday, the high pressure protection will allow for an unsettled southerly stream increasing afternoon thunderstorm again.
TODAY - SATURDAY MAY 27
Fair summer‑like weather ‑ possible afternoon thunderstorm over the massifs
SKY CONDITION : clear to partly cloudy or locally cloudy ‑ large isolated cumulus cloud likely to growing over the massifs as of the late morning. Period of sunshine close to 80%.
PRECIPITATION : afternoon thunderstorm risk over the massifs in the afternoon ‑ rain‑snow limit towards 3800 m.
WIND - ground level : calm ‑> thermal SW light to moderate ‑> calm.
WIND - mid mountain : variable ‑> SW light ‑> calm.
WIND - high mountain : variable anticyclonic very light.
TEMPERATURE : low +10°C - high +28°C.
ISOTHERM 0°C : 3900 ‑> 4100 ‑> 4000 m.
ISOTHERM -10°C : 5500 m.
OVERNIGHT
Fair weather ‑ mild in the median altitude range
SKY CONDITION : late evening remaining cloud dispelling, then clear.
PRECIPITATION : none.
WIND - aloft : variable ‑> N light.
TEMPERATURE : low +8°C.
SUNDAY MAY 28
Fair weather ‑ hot in the valley ‑ warm in the median altitude range
SKY CONDITION : clear or partly cloudy ‑ afternoon cumulus cloud over the massifs. Period of sunshine close to 85%.
PRECIPITATION : late afternoon thundery shower slight risk over the massifs.
WIND - aloft : N light.
TEMPERATURE : low +8 °C - high +29°C.
MONDAY MAY 29
Sunny and warm morning ‑ becoming sultry ‑ late afternoon thundery shower
SKY CONDITION : clear or partly cloudy in the morning ‑ becoming cloudy or locally mostly cloudy in the afternoon due to cumulus cloud growth. Period of sunshine close to 60%.
PRECIPITATION : late afternoon thundery shower or thunderstorm ‑ rain‑snow limit towards 3800 m.
WIND - aloft : N ‑> variable ‑> S light.
TEMPERATURE : slightly dropping highs.
EXTENDED OUTLOOK UNTIL THURSDAY JUNE 1 2017

Tuesday : thundery condition likely after a fairly sunny morning. Wednesday : uncertain ‑ probably unsettled and warm with locally heavy thundery showers in the afternoon. Thursday : uncertain ‑ probably unsettled ‑ sunny spells, then frequent thundery shower.

Forecast reliability : fairly good until Sunday ‑ poor thereafter.

ReportsAs a reminder, today in Chamonix, the sun rises at 05:47:34 and goes down at 21:12:11.
45.55 N 6.51 E - Altitude 1040 m
27 may 07:00
Temperature +10°C
Relative humidity 82%
Wind 0 km/h
Sea level pressure 1021 hpa - rising slowly
Pressure at 1042 m 904 mb
Precipitation last 6h 0 mm
Skies partly cloudy
Visibility 90000 m
Altitude 3845 m
27 may 07:00
Temperature 0°C
Wind W 5 km/h
Altitude 2250 m
27 may 06:00
Snow depth 25 cm
Wind 0 km/h
Gusts 5 km/h
Temperature +10°C