Yesterday, the state of Minnesota suffered the worst tornado outbreak in its history. Sixty-two twisters were reported in Iowa, Minnesota, and eastern North Dakota with the worst of the storms in Minnesota.
Damage is reported all over the state. More here. While a number of towns are in ruins, the death toll was three. While tragic, that number is amazingly low. Prior to the warning system, a single tornado in Minnesota killed 72!
The warning system continues to have amazing results, month in and month out.
UPDATE: Spectacular photography of the tornadoes here. There are great examples of the "green sky."