Back to main menu  /  d1+09Z  d1+12Z  d1+15Z   /  Help and usage   /  Use the clickable blipmaps below to get the name (mouse over) or the aerological profile (click on) of the place indicated by a black small star.
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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: 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. The lower chart represents the sum of W* plus this upward/downward air motion. If you see an area with +300 cm/s on the chart, it does not mean that you will meet this upwind everywhere in this area. It does mean that you can meet there a local upwind with an average maximal rate of +300 cm/s (minus the sink rate of your aircraft).
Aide rapide: Carte des zones de soulvement maximal moyen ou d'affaissement (subsidence) maximal moyen de l'atmosphre dus respectivement la convergence ou la divergence des brises rgionales. Ces zones sont difficilement mises en vidence si la rsolution des modles est basse. Lorsque le paramtre CAPE est grand, les zones de convergence tendent devenir les zones de dclenchement des orages. La carte d'en bas reprsente la somme de la vitesse ascendante moyenne des thermiques (W*) et de la vitesse verticale des zones de convergence/divergence. Cela ne signifie pas que sur une zone rouge indiquant +300 cm/s on rencontre partout une telle ascendance. Cela signifie que localement on peut rencontrer une ascendance dont la valeur maximale moyenne est de 300 cm/s (moins le taux de chute de l'aronef).

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