DATE : July Sunday 6th 1997
Sunset 21 h 22 min
GENERAL SYNOPSIS- Altitude :Between the low over the north of Italy and the near Atlantic ridge, moderate to weak northerly flow over the Alps today. The flow is progressively becoming north-westerly, below 5500m in a first time, then at all levels in late afternoon. - Surface : The high pressures centred over the near Atlantic extend to France. Moderate northerly flow in the Rhône valley, weaker inside the Alps where the breeze effects could become predominating during the afternoon. More stable and drier air mass.
QNH 1019 hPa FL 75 2335m FL 115 3555m FL 195 5995m
AIR MASS / DEVELOPMENT OF CONVECTION SOUTHERN ALPS- St-Auban sounding
: dry air mass, instability limited from surface to 2000m ; subsiding effect
above.Evolution : thermal with 1 to 2 Cu, base up to 2400m with Temp Max
about 24°C. - Aubenasson sounding : air mass still moist and
unstable in low level, from surface to 2600m ; drier and stable above.
Evolution : thermal with 2 to 3 Cu, base up to 2000m with Temp Max
about 20°C. - St-Crépin sounding : nocturnal inversion
up to 1400m, then rather dry but unstable air mass ; dry and stable above.
Evolution : thermal with 2 cu base up to 3200m ; along the Italian frontier,
risk of Cb with local thunderstorm
ISO 0°C 3200m m ISO -10 °C 4800 m
Favourable elements : - north lee waves in the west part, near the Rhône
valley. - northerly slope updrafts. Unfavourable
elements :- risk of Cu congestus and Cb near the Italian frontier with
possibility of local thunderstorm.
Outlook for tomorrow : - moderate northerly flow ; anticyclonic conditions
; an other good day in view...
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Flament (from Nogaro
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