Hail: theory and observations. 30 November 2006. Supercell schematic. Why is it important to study hail?. Relatively rare occurrence Not well understood Consequently difficult to forecast Potential for destructive property damage Cars (personal and dealerships) Livestock
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30 November 2006
Mäßig gefährdete Gebiete sind gelb umrandet (praktisch gesamt Österreich exklusive dem Hochgebirge), stärker bedrohte Regionen rot. Besonders gefährdet sind Teile der SO-Stmk (nicht selten mehrere Hageltage an einem Punkt), was schwarz gekennzeichnet ist.
Using conventional (horizontal polarization) radar, hail can sometimes be detected with the presence of a “hail spike”.
Radar beam reaches hail stone, is reflected to the surface, then reflected back to the hail stone, and finally back to the radar site. The computer algorithm interprets this “false signal” as precipitation occurring several tens of km beyond the thunderstorm.
Examples of “hail spikes”, or “three-body scatter (the hail, the ground, and the hail = three bodies) on radar