A strong downward rush of air which produces a blast of damaging wind on or close to the surface. Air that descends an elevated plain and consequently warms and dries. Occurs when prevailing wind direction is from the same direction as the elevated terrain and often produces fair weather conditions. A cloud, with its base on the surface, reducing visibility. Issued when consider favorable for the development of high winds over all or part of the forecast area but the occurrence is still uncertain.
Surface based inversions occur during long nights when calm conditions and dry air exists.
A line on a weather map that connects points of equal pressure. On the weather map, isobars extend around areas of high and low pressure. Relatively strong winds that are concentrated in a narrow band in the atmosphere. Jet streams are usually thousands of kilometers long, hundreds of kilometers wide but only a few kilometers thick. The side of an object that is facing away from the direction that the wind is blowing.