CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST
ISSUED AT 18:55 ON FRIDAY MAY 24, 2013
VALID FROM : FRIDAY MAY 24 -- UNTIL : THURSDAY MAY 30 2013
Ah spring spring
How great is spring !
and so on
Extended low area over Europe. Minimum 1005 hpa, Eastern English Channel, linked to an altitude cold drop. The whole system is moving southeast while filling. Linked disturbance crossing over the Alps by Saturday. Starting up to improving on Sunday and furthermore on Monday. Southwesterly stream setting up from Tuesday, thus triggering a rainy-thundery deterioration from Tuesday.
FRIDAY EVENING MAY 24 - AND OVERNIGHT
SKY CONDITION : mostly cloudy, then overcast.
PRECIPITATION : scattered showers in the first of the night - becoming more frequent later - rain-snow limit towards 1200 m, dropping towards 900 m.
WIND - ground level : variable light.
WIND - mid mountain : SE -> NW light.
WIND - high mountain : W light to moderate -> S light.
TEMPERATURE : low 0°C.
ISOTHERM 0°C : 1400 -> 1200 m.
ISOTHERM -10°C : 2800 -> 2600 m.
Shower risk is lower in the Upper Aosta Valley.
TOMORROW - SATURDAY MAY 25
SKY CONDITION : mostly cloudy to overcast. period of sunshine close to 0%.
PRECIPITATION : frequent in the morning, becoming scattered in the afternoon, although locally heavy with possible thunderstorm - rain-snow limit towards 900 m, rising up towards 1200 m - expected snowfall towards 1800 m : 15-25 cm.
WIND - ground level : NW light -> N light to moderate.
WIND - mid mountain : S light -> NE light to moderate.
WIND - high mountain : variable light -> NE light to moderate.
TEMPERATURE : low 0°C - high +6°C.
ISOTHERM 0°C : 1200 -> 1500 m.
ISOTHERM -10°C : 2600 -> 2800 m.
Fleeting sunny spells likely over the Upper Aosta Valley.
SATURDAY TO SUNDAY NIGHT - MAY 25 TO 26
SKY CONDITION : mostly cloudy - becoming probably cloudy with clear spell by the end of the night.
PRECIPITATION : scattered showers - becoming isolated - rain-snow limit towards 1100 m.
WIND - aloft : NE light to moderate -> NNW light.
TEMPERATURE : low +1°C.
SUNDAY MAY 26
SKY CONDITION : mostly cloudy - becoming cloudy with sunny spells during the afternoon. Period of sunshine close to 30%.
PRECIPITATION : isolated showers - rain-snow limit towards 1500 m.
WIND - aloft : NNW light -> light to moderate.
TEMPERATURE : low +1 °C - high +8°C.
MONDAY MAY 27
SKY CONDITION : fairly sunny - cumulus cloud growth. Period of sunshine close to 80%.
PRECIPITATION : none.
WIND - aloft : NW light to moderate -> W moderate.
TEMPERATURE : low +3°C - high +15°C.
EXTENDED OUTLOOK UNTIL THURSDAY MAY 30 2013
Tuesday : sunny morning - rainy-thundery deterioration at night. Wednesday : rainy morning - improving in the afternoon. Thursday : unsettled and cool - showers - fleeting sunny spells.
Forecast reliability : fairly good until Saturday - poor thereafter.
Beware of the avalanche risk high up.