CHAMONIX VALLEY AND MONT-BLANC AREA WEATHER FORECAST


Matsuo Bashō
Higher than the lark
Resting in the sky
Of the mountain pass
ISSUED AT 08:15 MONDAY JUNE 18
VALID FROM : MONDAY JUNE 18 ‑‑ UNTIL : SATURDAY JUNE 23 2018

GENERAL SYNOPSIS
New high pressure push from the Azores, 1022 hpa this morning north of the Alps, after the somewhat delayed weak disturbance passing last night. • Early morning cloud lying in the valley will be mostly dispelling under direct sunshine. Leftovers will be turning into cumulus cloud over the slopes. • Fair sunny high pressure condition currently setting up is expected to lasting at least until Wednesday morning. Very mild in the median altitude range today; hot afternoons in the valley from Tuesday. • Outlook becomes more uncertain thereafter : while refocusing west of the British Isles, the Atlantic High will give room to unstable mediterranean puffs up to the Alps towards the latter part of the week.
TODAY - MONDAY JUNE 18
Fairly sunny ‑ warm in the afternoon ‑ becoming windy high up
SKY CONDITION : cloudy in the valley early in the morning ‑ broken stratus cloud dispelling partly ‑ leftovers turning into cumulus cloud over the slopes in the afternoon. Period of sunshine close to 65%.
PRECIPITATION : none.
WIND - ground level : calm ‑> variable light.
WIND - mid mountain : NE light ‑ light to moderate at times.
WIND - high mountain : N moderate ‑> NNE moderate to strong.
TEMPERATURE : low +14°C - high +24°C.
ISOTHERM 0°C : 3700 ‑> 4300 m.
ISOTHERM -10°C : 5500 ‑> 6100 m.
OVERNIGHT
Clearing skies ‑ decreasing wind high up
SKY CONDITION : cloudy with clear spells at first ‑ becoming clear or partly cloudy.
PRECIPITATION : none.
WIND - aloft : NNE moderate to strong ‑> N light to moderate.
TEMPERATURE : low +10°C.
TUESDAY JUNE 19
Amazingly fair weather ‑ hot in the afternoon
SKY CONDITION : clear or partly cloudy ‑ scarce cumulus cloud over the massifs in the afternoon. Period of sunshine close to 100%.
PRECIPITATION : none.
WIND - aloft : N light to moderate.
TEMPERATURE : low +9 °C - high +27°C.
WEDNESDAY JUNE 20
Fairly sunny ‑ hot afternoon in the valley ‑ evening shower risk
SKY CONDITION : clear or partly cloudy in the morning ‑ partly cloudy to cloudy in the afternoon due to cumulus cloud growth. Period of sunshine close to 75%.
PRECIPITATION : none.
WIND - aloft : NNE light to moderate ‑> NE light.
TEMPERATURE : rising lows ‑ slightly dropping highs.
EXTENDED OUTLOOK UNTIL SATURDAY JUNE 23 2018

Thursday : fairly sunny ‑ hot in the afternoon with large cumulus cloud growth over the massifs and isolated shower risk later. Friday : remaining cloud likely in the morning ‑ becoming sunny and warm. Saturday : uncertain ‑ probably sunny ‑ warm in the afternoon.

Forecast reliability : fairly good until Tuesday ‑ poor thereafter.

ReportsAs a reminder, today in Chamonix, the sun rises at 05:41:39 and goes down at 21:26:16.
45.55 N 6.51 E - Altitude 1040 m
June 18 07:00
Temperature +14°C
Relative humidity 84%
Wind 0 km/h
Sea level pressure 1022 hpa - rising slowly
Pressure at 1042 m 905 mb
Precipitation last 6h 0.0 mm
Skies cloudy - broken stratus cloud - clear above 2500 m
Visibility 60000 m
Altitude 3845 m
June 18 07:00
Temperature -2°C
Wind N 10 km/h
Altitude 2250 m
June 18 06:00
Snow depth 17 cm
Wind 5 km/h
Gusts 15 km/h
Temperature +5°C