Thunderstorm

Region/Country	Description
US	A thunderstorm that produces a tornado, winds of at least 58 mph (50 knots), and/or hail at least ¾" in diameter. Structural wind damage may imply the occurrence of a severe thunderstorm. A thunderstorm wind equal to or greater than 40 mph (35 knots) and/or hail of at least ½" is defined as approaching severe.
EU	Thunderstorms
CA	A Severe Thunderstorm Warning is issued when a severe storm has developed, producing one or more of the following conditions: flooding rain, destructive winds with gusts greater that 90 km/h, hail of at least 10 to 20 mm in diameter or intense lightning. Severe thunderstorms may also produce tornadoes. The storm's expected motion and developments will be given in the warning. If you are in the area specified, take shelter. Area or line of thunderstorms causing gusts to 34 knots or more.
AU	Aerodrome Thunderstorm Alert Aviation Lightning Warning Severe Thunderstorm Warning.
JP	Thunderstorms
DE	Elektrische Entladung, auch in Verbindung mit Windböen In Verbindung mit Sturmböen, schweren Sturmböen, Starkregen oder Hagel Sehr starkes konvektives Ereignis. Gewitter mit Hagelschlag, heftigem Starkregen oder Orkan(artigen)Böen.