Barrage cloudiness forms if a flow of sufficiently moist air is forced to rise over a mountain barrier. This process generally results in prolonged precipitation.

Parameter	Description
Precipitation	Active front: intensification of precipitation within the Barrage Separate Barrage clouds: long lasting, high precipitation activity, mostly rain or drizzle, convective showers embedded if a strong uplift is provided
Temperature	Cold stable shallow air mass on the windward side of the mountains, warm dry on the lee side.
Wind (incl. gusts)	Weakening within the Barrage region, strong winds on the lee side
Other relevant information	Low and multilayered clouds in the Barrage area, high clouds or cloud free at the leeward side Icing from high amount of super-cooled water within the Barrage cloudiness