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Surface parameters: mslp / sfc temperature / sfc dew point / sunshine / snow cover   /  Wind parameters  /  thermal parameters  /  clouds parameters
Quick help: The mean sea level pressure (mslp) is the atmospheric pressure at sea level (the pressure reduced to sea level). It is an important parameter for paraglider and hangglider pilots flying in the Alps. A strong (more than 3-5 hPa) transalpine (between the north and the south sides of the Alps) mslp difference can result in unsafe and turbulent flying conditions associated with foehn phenomena, especially if there is strong winds aloft. If mslp is higher on the north alpine side it is often humid and cold on this side while it is dry and relatively warm on the south side (Italy) with turbulent and strong north wind. It is exactly the opposite with high pressure on the south side. With this chart you can immediately see red-orange colour areas (high pressure) on one alpine side and blue-green colour areas (low pressure) on the other one. If you see the same colour e.g. yellow on each side of the Alps, you can conclude a weak pressure difference between these both sides and thus safe flying conditions.
Aide rapide: La pression atmosphrique rduite au niveau de la mer peut tre un facteur important pour le vol libre. Une diffrence de plus de 3-5 hPa peut conduire des conditions de vol malsaine et turbulente surtout si des vents forts en altitude sont associs (phnomnes de foehn). Si la pression est plus forte au nord des Alpes, l'atmosphre est souvent humide et frache au nord et sche, chaude et agite (turbulence et vents forts) au sud. C'est exactement le contraire lorsque la pression est plus forte au sud. Avec cette carte on peut voir immdiatement 9, 12 et 15Z, la diffrence transalpine de pression ces 3 moments. Une plage rouge-orange correspond une zone de forte pression, une plage verte-bleue une zone de faible pression. Si les plages de couleur sont identiques ou proches de part et d'autres des Alpes (par exemple jaune), la diffrence transalpine de pression est faible.