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Thermal parameters: BL top height / BL depth / BL topvariab / W* / B/S ratio / Convergence   /  Wind parameters  /  sfc parameters  /  clouds parameters
Quick help: Average dry thermal updraft strength near mid-BL height. Subtract glider descent rate to get average vario reading for cloudless thermals. Updraft strengths will be stronger than this forecast if convective clouds are present, since cloud condensation adds buoyancy aloft (i.e. "cloudsuck"). W* mainly depends (it is proportional) upon both the surface heating and the BL depth.
Aide rapide: Carte de la vitesse ascendante moyenne (W*) des thermiques mi-hauteur de la couche convective (CC) pour des thermques sans cumulus. Il faut soustraire le taux de chute en virage de votre planeur pour avoir la vitesse ascendante nette. W* dpend principalement de l'paisseur de la CC et du rchauffement au sol. Ce dernier dpend de la scheresse et du type de sol et de l'insolation. Plus la CC est paisse et plus W* est grand.