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As far as the severe weather season is concerned. march through may, we saw that this year as far as tornadoes across the southeast. we start to lift it with the jet stream as it migrates to the north. april and may, may especially a i cross the areas we're concerned with today and to the north as well. we talk about this ef scale, highlight how that breaks down, an ef-4 tornado, that means that winds are estimated to be 166 up to 200 miles an hour. this tornado on the higher end of that, ef-5, over 200 miles an hour. you get to those ranges and it really doesn't mean a whole lot. we're talkin...

This is concerning for everyone in the weather business and everyone here needs to be on full alert especially tomorrow evening as the storms come out of central oklahoma and central kansas and move toward southwest missouri later early evening and late afternoon and be on guard because tomorrow will be long track tornadoes and maybe significant tornadoes as well. >> jeff, what we're hearing is that this is already statistically the 11th worst tornado season that america has seen in recorded history. obviously it's not over yet and it could rise up that ladder quite sharply and quite quickly. ...

Because tomorrow will be long track tornadoes and maybe significant tornadoes as well. >> jeff, what we're hearing is that this is already statistically the 11th worst tornado season that america has seen in recorded history. obviously it's not over yet and it could rise up that ladder quite sharply and quite quickly. in all your time, how bad would you say what you've been seeing is by comparison to other seasons? >> this is definitely one of the more intense seasons we're seeing more ef-4s and ef-5 than we normally do. more intense tornadoes. unfortunate thing is those tornadoes on the 27th ...

Two weeks, there was one two weeks ago which was just as powerful. we're now seeing this. it seems like this is getting worse. am i right to think that or from a meteorological point of view is this kind of what happens every few years? >> reporter: well, we always expect this clash of air masses in spring and as the warm air wants to overtaken the cold air of winter. but this has been highly unusual. earlier in the broadcast we were talking about the number of ef-4s. since we've been keeping records since 1800s of storms and weather in this country, the number or the percentage of ef-4 tornad...

our ears started to pop. >> incredible stories of survival. >> we thought we were going to be sucked up the chimney. >> now joplin, missouri, holds its breath and wonders is it over yet? >> it was crazy. i never seen nothing like that a day in my life. >> why now? what's really going on? >> that is destroyed. completely. >> twisters, volcanoes, earthquakes, tsunamis. where will mother nature strike next? eyewitness accounts from storm chasers and reports from the ground. >> debris on the ground here. >> this is a special edition of "piers morgan tonight." good evening. joplin, miss...