CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST
ISSUED AT 07:40 MONDAY APRIL 24
VALID FROM : MONDAY APRIL 24 ‑‑ UNTIL : SATURDAY APRIL 29 2017
Ah spring spring
How great is spring !
and so on
High ridge 1020 hpa, Ireland to Western Austria, sagging over France. • Deepening low towards 990 hpa over the Southern Scandinavian by this evening. • As a result over the Western Alps, altitude stream will be gradually backing southwest strong by Tuesday evening. • Fair weather today with a cool morning and a warm and dry afternoon, thanks to a temporary fœhn gradient between the remaining high pressure field over Northern Italy and an evasive minimum heading from Spain towards Central France. • Twofold cold front crossing over our Region between Tuesday afternoon and Wednesday evening, driven by a polar air inflow over France, triggering heavy precipitation at times with possible low altitude snowfall.
TODAY - MONDAY APRIL 24
SKY CONDITION : clear in the morning ‑ becoming partly cloudy in the afternoon ‑ cirrus cloud coming in from the southwest and cumulus cloud growth over the slopes in the afternoon. Period of sunshine close to 85%.
PRECIPITATION : none.
WIND - ground level : SW light ‑> calm ‑ fœhn puffs likely in the afternoon.
WIND - mid mountain : SW light to moderate ‑ light at times.
WIND - high mountain : WNW ‑> W light to moderate.
TEMPERATURE : low 0°C - high +21°C.
ISOTHERM 0°C : 2600 ‑> 2800 ‑> 2600 m.
ISOTHERM -10°C : 4100 m.
SKY CONDITION : partly cloudy to cloudy ‑ thin high cloud crossing over ‑ becoming thicker by the end of the night.
PRECIPITATION : none.
WIND - aloft : W light to moderate ‑> WSW moderate to strong ‑ fœhn wind puffs in the valley.
TEMPERATURE : low +4°C.
TUESDAY APRIL 25
SKY CONDITION : becoming mostly cloudy from the west‑southwest ‑ overcast in the evening. Period of sunshine close to 25%.
PRECIPITATION : starting up in the afternoon as light to moderate showers ‑ faily heavy precipitation likely during the following night ‑ rain‑snow limit towards 2000 m, locally dropping towards 1500 m during the night.
WIND - aloft : WSW moderate to strong ‑> SW strong.
TEMPERATURE : low +3 °C - high +15°C.
WEDNESDAY APRIL 26
SKY CONDITION : overcast, then mostly cloudy ‑ fleeting sunny spell likely in the afternoon. Period of sunshine close to 10%.
PRECIPITATION : moderate to heavy in the morning, turning into scattered showers in the afternoon ‑ rain‑snow limit dropping towards 1200 m ‑ expected snowfall towards 1800 m : 25‑25 cm, windblown.
WIND - aloft : SW ‑> WSW strong.
TEMPERATURE : steeply dropping highs.
EXTENDED OUTLOOK UNTIL SATURDAY APRIL 29 2017
Thursday : unsettled and cold ‑ scattered snow shower ‑ fleeting sunny spell ‑ southwest still fairly strong in the morning high up. Friday : improving slightly ‑ some sunny spells ‑ shower risk ‑ getting slightly milder. Saturday : fairly sunny ‑ very cold in the morning ‑ fairly strong north wind high up.
Forecast reliability : fairly good today ‑ poor thereafter.