TODAY – THURSDAY APRIL 11 2013
Rainy morning – f?hn wind likely in the afternoon
SKY CONDITION : overcast early in the morning – becoming mostly cloudy or cloudy with fleeting sunny spells at times towards the middle of the day – increasing cloud later in the afternoon. Period of sunshine close to 20%.
PRECIPITATION : light continuous rain early in the morning, changing for showers – rain-snow limit rising up towards 2200 m – probably no precipitation in the afternoon.
WIND - ground level : variable light to moderate – f?hn wind puffs in the afternoon.
WIND - mid mountain : S light to moderate – moderate at times.
WIND - high mountain : WSW moderate to strong -> SW strong.
TEMPERATURE : low +5°C - high +16°C.
ISOTHERM 0°C : 2300 -> 2700 -> 2400 m.
ISOTHERM -10°C : 3800 -> 4000 m.
Very unsettled – heavy rain strip crossing over
SKY CONDITION : mostly cloudy, then overcast – mostly cloudy with possible fleeting clear spells towards the end of the night.
PRECIPITATION : probably starting up shortly before the middle of the night – heavy at times by the middle of the night – changing for showers later – rain-snow limit dropping towards 1800 m – expected snowfall towards 2500 m : 25-50 cm, windblown.
WIND - aloft : SW -> WSW strong – moderate to strong at times.
TEMPERATURE : low +4°C.
FRIDAY APRIL 12
Unsettled and cooler – sunny spells – more frequent showers in the afternoon
SKY CONDITION : mostly cloudy – sunny spells at times due to instability. Period of sunshine close to 30%.
PRECIPITATION : fairly heavy showers still possible early in the morning, becoming scattered – more frequent showers resuming in the afternoon – rain-snow limit towards 1400 m – expected snowfall towards 1800 m : 10-20 cm, windblown.
WIND - aloft : WSW -> W strong – moderate to strong at times.
TEMPERATURE : low +3 °C - high +11°C.
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Very unsettled westerly stream over France with strong winds high up until Friday. Low 986 hpa southwest of Ireland, drifting east. Satellite minimum 995 hpa, Southern England, moving northeast while filling. Warm front of the linked disturbance crossing over the Alps in the morning, driving a rainy spell over the area. Short f?hn wind period likely in the afternoon, then the cold front, very active, is expected to crossing over towards the middle of the night. Mild high pattern expected to setting up from Saturday, over the Western Mediterranean at first, then Central Europe.