Answer: Hurricane Flash flood tsunami and tornado Explanation: What is a severe weather event? A Severe weather event is 1-2 inches of hail (25-51 mm) an F1 tornado or winds up from 58-75 miles per hour (or 93 to 121 km/hour) but there is something called a Significant severe weather which is more than what is listed. So we already know that a hurricane, tornado, flash flood and tsunami are ALL severe weather events. But what about Earthquake and Volcano. While yes, they ARE considered severe events, they are NOT titled under these criteria.