CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Natsume Sôseki
Ask the breeze
Which leaf
First to fall will be
ISSUED AT 18:55 ON FRIDAY AUGUST 28, 2015
VALID FROM : FRIDAY AUGUST 28 2015 -- UNTIL : THURSDAY SEPTEMBER 03 2015

GENERAL SYNOPSIS
Extended low, 990 hpa south of Iceland, filling slowly and driving a dry and stable altitude stream towards the Alps, where a fairly weak surface high is tending to get slightly higher. Current fair weather will persist until Monday, getting hotter each afternoon due to an african altitude high pressure component. Temperature will locally get above 20°C at 2000 m. Light fœhn wind puffs will increase dry heat feeling in the valley on Saturday afternoon.
FRIDAY EVENING AUGUST 28 - AND OVERNIGHT
Clear and mild
SKY CONDITION : clear - thin high cloud running over from the southeast towards the end of the night.
PRECIPITATION : none.
WIND - ground level : variable light.
WIND - mid mountain : SW -> S light.
WIND - high mountain : WSW moderate -> SSW light.
TEMPERATURE : low +13°C.
ISOTHERM 0°C : 4600 -> 4700 m.
ISOTHERM -10°C : 6300 -> 6200 m.
Snow surface re-freezing high up : poor or non-existent.
ROAD CONDITION  : @ 06:30, dry roadways.morelive precipitation radar over the Alps
TOMORROW - SATURDAY AUGUST 29
Sunny - warm, getting hot fairly soon - slight fœhn wind trend
SKY CONDITION : clear or partly cloudy - some high cloud running over from the south in the morning - becoming locally cloudy on the high massifs in the afternoon due to cumulus cloud growth. period of sunshine close to 80%.
PRECIPITATION : late afternoon shower slight risk over the massifs.
WIND - ground level : variable light - fœhn wind trend in the afternoon.
WIND - mid mountain : S -> SSE light.
WIND - high mountain : SSW light.
TEMPERATURE : low +13°C - high +30°C.
ISOTHERM 0°C : 4700 m.
ISOTHERM -10°C : 6200 -> 6000 m.
Same kind of weather over the whole area.
SATURDAY TO SUNDAY NIGHT - AUGUST 29 TO 30
Clear and mild
SKY CONDITION  : evening cumulus cloud vanishing soon - becoming clear.
PRECIPITATION : none.
WIND - aloft : SSW faible.
TEMPERATURE : low +13°C.
Same kind of weather over the whole area.
SUNDAY AUGUST 30
Fine sunny weather - hot in the afternoon
SKY CONDITION : clear in the morning - some afternoon cumulus cloud. Period of sunshine close to 95%.
PRECIPITATION : none.
WIND - aloft : SSW light - slight fœhn wind trend in the valley.
TEMPERATURE : low +12 °C - high +29°C.
Same kind of weather over the whole area.
MONDAY AUGUST 31
Fine sunny weather - becoming somewhat sultry in the afternoon
SKY CONDITION : clear in the morning - afternoon cumulus cloud expected to growing some more in the evening. Period of sunshine close to 90%.
PRECIPITATION : none.
WIND - aloft : SW light -> moderate.
TEMPERATURE : low +11°C - high +29°C.
Uncertain.
EXTENDED OUTLOOK UNTIL THURSDAY SEPTEMBER 03

Tuesday : changeable ‑ noticeably cooler, yet remaining sultry ‑ thundery shower in the morning and towards the evening. Wednesday : changeable ‑ some sunny spells ‑ showery at times ‑ temperature matching seasonal average. Thursday : changeable and slightly cooler than seasonal average - cloudy, yet dry.

Forecast reliability : fairly good until Sunday ‑ poor thereafter.

ReportsAs a reminder, today in Chamonix, the sun rises at 06:53:30 and goes down at 20:11:28.
45.55 N 6.51 E - Altitude 1040 m
1 September 07:00
Temperature +14°C
Relative humidity 85%
Wind 0 km/h
Sea level pressure 1016 hpa - rising
Pressure at 1042 m 896 mb
Precipitation last 6h 0.0 mm
Skies mostly cloudy - shower in sight
Visibility 20000 m
Altitude 3845 m
1 September 07:00
Temperature -3°C
Wind SSW 60 km/h
Altitude 2250 m
1 September 06:00
Snow depth 0 cm
Wind 10 km/h
Gusts 20 km/h
Temperature +10°C