High clouds may bring this type of damaging precipitation, especially to the "alley" for it in the Rockies
The cloud can bring heavy showers, hail, lightning, high winds 
and ... Too little rainfall can cause shortages in the water supply, destroy crops, 
and ..... Tornado alley is between the Plains area from the Rocky Mountains on 
the... [DOC] [TLE] The Online Tornado FAQ (by Roger Edwards, SPC) [PAR] Mar 29, 2016 ... Tornado Forecasting, Tornado Damage, Tornado Safety, Historical ... in an SPC "
High Risk" outlook, not every thunderstorm spawns a tornado.