CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST
Matsuo Bashō
Ah spring spring
How great is spring !
and so on
How great is spring !
and so on
VALID FROM : SUNDAY MAY 19 -- UNTIL : SATURDAY MAY 25 2013
GENERAL SYNOPSIS
Persistent low pattern over Western Europe. Minimum 1007 hpa, Eastern France, linked to an altitude cold drop. The whole system is moving towards Germany, driving a humid, unsettled and cold westerly stream over the area tonight. Relative improvement overnight, keeping on by Monday. Low gradient pattern expected to ruling over the Alps until Wednesday, favoring diurnal instability. Then, deterioration expected due to a new altitude cold drop coming in over France by Thursday evening and over Switzerland by Friday.
SUNDAY EVENING MAY 19 - AND OVERNIGHT
Cloudy - shower ending - almost cold by dawn
SKY CONDITION : mostly cloudy at first - becoming cloudy with clear spells, then partly cloudy.
PRECIPITATION : showers, still fairly heavy, ending early in the night - rain-snow limit towards 1500 m - dry later.
WIND - ground level : variable light.
WIND - mid mountain : W -> WSW light.
WIND - high mountain : WSW light to moderate.
TEMPERATURE : low +2°C.
ISOTHERM 0°C : 1900 -> 1700 m.
ISOTHERM -10°C : 3600 -> 3400 m.
More persistent shower over the Aosta valley.
TOMORROW - MONDAY MAY 20
Diurnal instability - fairly sunny - afternoon shower slight risk
SKY CONDITION : partly cloudy to cloudy with sunny spells - cumulus cloud growth over the slopes in the afternoon. period of sunshine close to 75%.
PRECIPITATION : late afternoon shower slight risk - rain-snow limit towards 1800 m.
WIND - ground level : variable light.
WIND - mid mountain : WSW -> W light - light to moderate at times.
WIND - high mountain : WSW light to moderate -> W moderate.
TEMPERATURE : low +2°C - high +15°C.
ISOTHERM 0°C : 1700 -> 2000 m.
ISOTHERM -10°C : 3400 -> 3600 m.
Same weather pattern over the Upper Aosta Valley.
MONDAY TO TUESDAY NIGHT - MAY 20 TO 21
Cloudy with clear spells - very cool by dawn
SKY CONDITION : cloudy with clear spells - wider towards the end of the night.
PRECIPITATION : none.
WIND - aloft : W moderate -> N light.
TEMPERATURE : low +3°C.
Uncertain.
TUESDAY MAY 21
Diurnal instability - bright morning sunny spells - afternoon shower slight risk
SKY CONDITION : partly cloudy to cloudy with sunny spells - cumulus cloud growth over the slopes in the afternoon. Period of sunshine close to 65%.
PRECIPITATION : afternoon shower slight risk - rain-snow limit towards 1900 m.
WIND - aloft : N light -> W light to moderate.
TEMPERATURE : low +3 °C - high +15°C.
Uncertain.
WEDNESDAY MAY 22
Diurnal instability - bright morning sunny spells - afternoon shower slight risk
SKY CONDITION : partly cloudy to cloudy with sunny spells - cumulus cloud growth over the slopes in the afternoon. Period of sunshine close to 60%.
PRECIPITATION : afternoon shower slight risk - rain-snow limit towards 1900 m.
WIND - aloft : N light -> W light to moderate.
TEMPERATURE : low +4°C - high +16°C.
Uncertain.
EXTENDED OUTLOOK UNTIL SATURDAY MAY 25 2013
Thursday : changeable and cool - NE wind - cloud patches crossing over with showers. Friday : altitude cold drop coming in close to the Alps - fairly strong NW, instability - possible snow towards 1200-1000 m. Saturday : still unsettled and cool.
Forecast reliability : fairly good until Monday - poor thereafter.
ReportsAs a reminder, today in Chamonix, the sun rises at 05:54:20 and goes down at 21:03:49.
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45.55 N 6.51 E - Altitude 1040 m
19 May 14 h
Temperature +10°C
Relative humidity 75%
Wind SW 10 km/h
Sea level pressure 1011 hpa - rising
Pressure at 1042 m 891 mb
Precipitation last 6h 4.5 mm
Skies mostly cloudy - shower
Visibility 8500 m
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Altitude 3845 m
19 May 14 h
Temperature -10°C
Wind W 10 km/h
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Altitude 2250 m
19 May 14 h
Snow depth 195 cm
Wind 10 km/h
Gusts 15 km/h
Temperature 0°C
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