CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST
ISSUED AT 08:55 SUNDAY NOVEMBER 17
VALID FROM : SUNDAY NOVEMBER 17 ‑‑ UNTIL : FRIDAY NOVEMBER 22 2019
Touching even more
In the light of the lantern
Cold prayer at night
Low pressure whirl over France and the Western Mediterranean, fed by extended maritime polar air thalweg, Iceland to Tunisia. In the vicinity of its southern tip, precisely Northern Tyrrhenian Sea, deepened a small low system which moves towards the Alps embedded in a southerly flow, loaded with Mediterranean humidity. As a result for this Sunday : easterly back‑stream with light snow north of the Alpine Barrier. • Then, slight fœhn trend will probably resume on Monday, making that flow drier over our Region, while cold air still there will begin to withdraw north.
TODAY - SUNDAY NOVEMBER 17
SKY CONDITION : overcast with ceiling towards 4000 m, dropping quickly towards 2000 m ‑ probably towards 1500 m in the evening. Period of sunshine close to 0%.
PRECIPITATION : intermittent and light, mostly between late morning and late afternoon ‑ rain‑snow limit likely to dropping towards 800 m at times ‑ expected snowfall towards 1600 m : 5‑8 cm.
WIND - ground level : calm or mainly SW, very light.
WIND - mid mountain : NE ‑> variable ‑> SW light.
WIND - high mountain : SE light ‑> ESE light to moderate.
TEMPERATURE : low ‑2°C - high 0°C.
ISOTHERM 0°C : 1300 ‑> 1000 m.
ISOTHERM -10°C : 3200 ‑> 3300 ‑> 3000 m.
ROAD CONDITION ••••• : ongoing light snowfall, without traffic repercussion. (Sun. 16:00).
SKY CONDITION : overcast or mostly cloudy at times ‑ low cloud condensing in the valley ‑ clear outbreaks likely high up towards the latter part of the night.
PRECIPITATION : possible snow flurries until the latter part of the night ‑ rain‑snow limit towards 700 m.
WIND - aloft : ESE ‑> S ‑> W light to moderate.
TEMPERATURE : low ‑2°C.
MONDAY NOVEMBER 18
SKY CONDITION : overcast early in the morning, ceiling probably below 1400 m ‑ sunny spells spreading over the hours. Period of sunshine close to 55%.
PRECIPITATION : none.
WIND - aloft : W light to moderate ‑> SSW moderate ‑ foehn trend in the valley.
TEMPERATURE : low ‑1 °C - high +4°C.
TUESDAY NOVEMBER 19
SKY CONDITION : low cloud likely early in the morning ‑ becoming clear or partly cloudy. Period of sunshine close to 60%.
PRECIPITATION : none.
WIND - aloft : S light to moderate ‑> NW moderate ‑ occasionally moderate to strong.
TEMPERATURE : slightly rising highs.
EXTENDED OUTLOOK UNTIL FRIDAY NOVEMBER 22 2019
Wednesday : fairly sunny ‑ getting noticeably milder in the valley and in the median altitude range ‑ altitude stream backing southwest, then south ‑ light foehn in the afternoon. Thursday : cloudy deterioration in unseasonably mild atmosphere with moderate foehn. Friday : very uncertain ‑ sunny spells and cloud crossing in turn ‑ slight shower risk.
Forecast reliability : fairly good until Monday.