DATE : 27th June 1997 sunset 21 h 18 min finish closes........ h ........ min
GENERAL SYNOPSIS
- Altitude : Low centered over Northern France quasi-Stationary and slowly filling. Strong southwesterly flow persisting over the Alps.
- surface : Waving disturbance over the Alps this morning , leaving Saint-Auban around 1130 Local Time. The cold air behind the front is unstable under 2600 m. An occlusion turn around the low pressure of Northern France and will touch tha Alps North of Gap.
QNH
1003 hPa
FL 75
2200 m
FL 115
3420 m
FL 195
5860 m
AIR MASS/DEVELOPMENT OF CONVECTION :
LOCAL ST-AUBAN : Unstable and moist from Surface up to 2600 m . Subsidence inversion from
2600 up to 3500 m , end of Aubenasson sounding.
3 to 5 Cu mediocris in the beginning of the afternoon , base around 1500 m becoming 2 to 4 Cu base around 2000 / 2200 m at 5 P. M.
ISO 0°C
2500 m
ISO -10 °C
4000 m
Favourable elements : - slight Foehn effect due to west winds under 3000 m.
Unfavourable elements :
- saturated soils.
- cloud cover North of Gap .
Outlook for tomorrow : Our region will be in marging of disturbance moving in a strong southerly flow. Sky probably very cloudy . We hope Foehn effect and south waves over region.