Back to main menu  /  d1+09Z  d1+12Z  d1+15Z Help and usage   /  Use the clickable blipmaps on the right to get the name (mouse over) or the aerological profile (click on) of the place indicated by a black small star. Thermal parameters: BL top height / BL depth / BL topvariab / W* / B/S ratio / Convergence   /  Wind parameters  /  sfc parameters  /  clouds parameters Quick help: Maximum grid-area-averaged extensive upward or downward air motion within the BL as created by horizontal wind convergence or divergence. Positive value is associated with regional upward convergence area. However, the actual size of such features is usually smaller than can be resolved by the model so only stronger ones will be forecast and their predictions are subject to much error. If CAPE is also large, thunderstorms can be triggered in these areas. Negative value (divergence) produces subsiding (downward) vertical air motion, creating low-level inversions which limit thermalling heights in this area. Aide rapide: Carte des zones de soulvement (valeurs positives, favorables aux thermiques) ou d'affaissement (subsidence, valeurs ngatives, "stabilisant" l'atmosphre) d'air dus respectivement la convergence ou la divergence des brises rgionales. Ces zones sont difficilement mises en vidence cause de la rsolution mdiocre des modles. Leur prdicition n'est donc pas toujours fiable. Lorsque le paramtre CAPE est grand, les zones de convergence tendent devenir les zones de dclenchement des orages.