CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST
ISSUED AT 07:25 SATURDAY MAY 27
VALID FROM : SATURDAY MAY 27 ‑‑ UNTIL : THURSDAY JUNE 1 2017
The snake flees—
But the eyes that peered at me
Remain in the weeds
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
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.
SKY CONDITION : late evening remaining cloud dispelling, then clear.
PRECIPITATION : none.
WIND - aloft : variable ‑> N light.
TEMPERATURE : low +8°C.
SUNDAY MAY 28
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
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.