<P> A thunderstorm is classed as severe if winds reach at least 93 kilometres per hour ( 58 mph ) , hail is 25 millimetres ( 1 in ) in diameter or larger , or if funnel clouds or tornadoes are reported . Although a funnel cloud or tornado indicates a severe thunderstorm , a tornado warning is issued in place of a severe thunderstorm warning . A severe thunderstorm warning is issued if a thunderstorm becomes severe , or will soon turn severe . In Canada , a rainfall rate greater than 50 millimetres ( 2 in ) in one hour , or 75 millimetres ( 3 in ) in three hours , is also used to indicate severe thunderstorms . Severe thunderstorms can occur from any type of storm cell . However , multicell , supercell , and squall lines represent the most common forms of thunderstorms that produce severe weather . </P>
<P> A thunderstorm is classed as severe if winds reach at least 93 kilometres per hour ( 58 mph ) , hail is 25 millimetres ( 1 in ) in diameter or larger , or if funnel clouds or tornadoes are reported . Although a funnel cloud or tornado indicates a severe thunderstorm , a tornado warning is issued in place of a severe thunderstorm warning . A severe thunderstorm warning is issued if a thunderstorm becomes severe , or will soon turn severe . In Canada , a rainfall rate greater than 50 millimetres ( 2 in ) in one hour , or 75 millimetres ( 3 in ) in three hours , is also used to indicate severe thunderstorms . Severe thunderstorms can occur from any type of storm cell . However , multicell , supercell , and squall lines represent the most common forms of thunderstorms that produce severe weather . </P>
the type of thunderstorm that has the most damaging winds and precipitation is a
the type of thunderstorm that has the most damaging winds and precipitation is a
severe thunderstorm
severe thunderstorm