1. Deadly storms in U.S. Nov.10-11 up to 72 tornadoes hit across eastern U.S.

2. Cause of storms and tornadoes  Strong cold jetstream hitting warm humid air from Gulf of Mexico

3.  up to 72 unconfirmed tornadoes, estimated to be at least in the F-3 category (winds ranging from 255 km/h to 330 km/h) => possibly F-5  storm warnings preceded twisters in the most hard-hit areas (Alabama => 46 tornado warnings were issued in an 11 1/2-hour period)

4. Tennessee17 Alabama12 Ohio5 Mississippi1 Pennsylvania1 DEATHS

5.  town destroyed, about 3.9 km 2 “wiped out.”  all 17 Tennessee deaths occurred here, 2 people still missing Worst affected: Mossy Grove, Tennessee

6. deadliest tornado struck on March 18, 1925, killing 695 people on a 350km track through Missouri, Illinois and Indiana. April 3-4, 1974, outbreak of tornadoes killed 310 in the U.S. and 8 in Canada May 1999, up to 70 tornadoes killed 44 people in Oklahoma and Kansas Past deadly storms in U.S. One brighter note: at least 60 people saved in Ohio theatre