DATE : july 1st 1997 sunset 21 h 18 min
GENERAL SYNOPSIS- Altitude :In the south part of a low over British island, westerly flow veering southwest in the afternoon before a perturbation coming from Spain. - surface : Rear sky with weakly anticyclonic pressure field.
QNH 1014hPa FL 75 2295m FL 115 3515m FL 195 5955m
AIR MASS/DEVELOPMENT OF CONVECTION :LOCAL ST-AUBAN AND SOUTH OF DURANCE
:Nocturnal inversion from surface to 1200m resorbed with 17°C about
11h loc. time ; unstable and moist air mass above up to 3500m (end of sounding).
A subsiding effect and the coming of warmer air in hight level should make
the air mass progressively more stable. Finally, with diurnal evolution,
3 /4 cu are expected for 11h loc. time, base 1200m, then 2/3 cu base 2000/2200m
at 15h loc. time for T max 22,5°C. HIGHT DURANCE VALLEY : No St Crépin
sounding this morning because bad conditions North of a line Embrun-Gap,
cloudiness more important, 5/6 cu tempo congestus with risk of showers.
DIOIS AREAVery humid air mass and still unstable becoming progressively
more stable ; 4 cu in early afternoon then hight risk of 6/7 cu with showers.
ISO 0°C 2800/3000 m ISO -10 °C 4400m
Favourable elements :- thermal with cu ; Unfavourable
elements : - upper level cloud becoming important in late afternoon
Outlook for tomorrow : Southwesterly perturbed flow ; very cloudy,
thunderstorms in the afternoon possibly strong...
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