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WORLD GLIDING CHAMPIONSHIPS 97 FORECAST BULLETIN
DATE : july Wednesday 2nd 1997 sunset finish closes : 21 h 18
GENERAL SYNOPSIS- Altitude :On the one hand short troughs move from west of France towards the Alps around the low
centred over the British Islands, and on the other hand an other trough moves from Spain to the south of France. As a
consequence moderate to rather strong south-southwesterly perturbed flow. - Surface : South to southeasterly moderate flow.
Warmer and mosiy air is rapidly coming from the Mediterranean sea.
QNH 1015hPa FL 75 2300m FL 115 3520m FL 195 5960m
AIR MASS / DEVELOPMENT OF CONVECTION SOUTHERN ALPS - St-Auban sounding : this morning : nocturnal
inversion from the surface to 900m ; stable and rather dry air mass above ; becoming moister above 3200m. - no soundings in
ST Crépin nor Aubenasson. - Evolution : local convection with 1 / 2 cu, 1100m 13h loc time, 1600/1700m with Tmax
22/23°C before the coming of very moist air mass in low level giving Sc, Cu congestus and Cb with thunderstorm.
ISO 0°C 3200 m ISO -10 °C 4800m
Favourable elements :- South wave - rare thermal in the end of the morning and the begin-ning of the afternoon with
Unfavourable elements :- cloudiness : overcast with mid-level clouds, then rapidly sc (some cu) - scattered showers specially
upward the orography as early as the beginning of the afternoon- thunderstorm development in the mid afternoon and in th
evening.
Outlook for tomorrow : Southwesterly flow ; possible but slow amelioration.
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