WORLD GLIDING CHAMPIONSHIPS   97 FORECAST BULLETIN

DATE : Thursday, July 10th 1997
Sunset 21 h 17 min

GENERAL SYNOPSIS- 5500m : Weak low over Spain, moving North and filling up in the afternoon. Over the Alps, very light flow, mainly from SW this morning, then W 5/10 Kt in the second part of this afternoon.- Surface : Flat low over South-West of France, slowly moving North-Easterly. Several cloud lines revolve around that low . One of thess lines will pass over St Auban in the first part of the afternoon. The weather will be cloudy and stormy, with rain showers. A little improvement is expected South of St Auban in the second part of the afternoon... but will have to be confirmed. Over mountains, the weather will remain very cloudy and stormy during all the afternoon..

QNH 1015 hPa FL 75 2300m FL 115 3520m FL 195 5960m

AIR MASS / DEVELOPMENT OF CONVECTION - St-Auban sounding :Moist and without inversion this morning....Nocturnal inversion under 1200m, destroyed around noon by 24°C surface temperature. Above 1200m, the atmosphere is unstable, and Cumulus will grow rapidly up to the Altocumulus layer, and become Cumulonimbus. The air mass will probably change in the second part of the afternoon, behind the small cold front, and the sky could be partly sunny ( 5/10th ).- Aubenasson: very similar to St Auban, without any inversion. Cb clouds and thunderstorms are likely over the mountains.
 

ISO 0°C 3400m  ISO -10 °C 4900 m

Favourable elements : -.??? May be an improvement in the second part of the afternoon???    Unfavourable elements :-Significant cloud covering, stopping convection at least untill 4 or 5 PM.- Strong risk of Cb and thunderstorms around noon and untill the first part of the afternoon.
 
Outlook for tomorrow : - Partly cloudy in the morning, but increasing pressure and light North-Westerly winds will clear the sky.Good soaring conditions are expected in the afternoon.
 
 


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