For the first case study on outbreak sequences, we examine two weeks of nearly nonstop tornadoes. Twisters brought devastating results from the central and southern Plains eastward into the Mid-Mississippi Valley and Great Lakes.
Every so often, tornado outbreaks come in volleys. In the first part of a series on outbreak sequences, we look at the necessary ingredients.
You might expect a volley of violent tornadoes in the Plains or the South, but not in Pennsylvania and surrounds. This event stands out for the country as a whole, and was truly exceptional for where it occurred.
On April 11, 1965, and over a time span of approximately 12 hours, one of the most infamous tornado events in United States history took place.