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. Surface parameters: mslp / sfc temperature / sfc dew point / sunshine   /  Wind parameters  /  thermal parameters  /  clouds parameters Quick help: It is the surface sunshine normalized (divided) by the amount of solar radiation which would reach the surface in a dry atmosphere (i.e. in the absence of clouds and water vapor), expressed as a percentage (relative sunshine). This parameter indicates the degree of cloudiness, i.e. where clouds limit the sunlight reaching the surface. So if there is 100% of dense clouds, the relative sunshine will be 0%. With 25% of such clouds, it will be 75%, but with 100% of half dense translucent clouds, it will be about 50%. This parameter can therefore often seem to over-evaluate the subjective sunshine which a pilot feels. Aide rapide: La carte de l'insolation relative (quantit relle de radiation au sol divise par la quantit maximale potentielle de radiation en l'absence de nuage, exprime en %) est le contraire de la quantit de nuage. S'il y a 100% ou 25 %de nbulosit dense il y aura respectivement 0% 75% d'insolation. S'il y a 100% de nuage moit translucide il y aura une insolation de 50%. Mon exprience montre que subjectivement l'insolation prvue par RASP semble souvent survalue.