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Chad myers, before we went to the break, people are asking for analysis, and they want to hear from the authorities here. they want to hear from you. what is going on that is causing all of this? >> the last time we had an outbreak like this, one accordingly in alabama the last couple of weeks and it was 1974. it has been a very long time and big cities get hit by such big tornadoes. those big tornadoes are out there every year. they are f-4s and ef-5s out there and much of the time they get range land. places that don't have a lot of town. we don't report on them. people are still injured and...

Tornado hit, that it sucked the people out of there and they were kill would. what happened the wins compressed if you know about physics, when you reduce the size of the wind that will increase the wind fields it looks tempting, you would be better finding a ravine or ditch. >> get low and not anywhere above ground but get as low as possible. >> i talked to radio stations and giving them live information and i said listen, with these kines of tornados and ef-4s and 5s, you need to be underground. that may be your only way to survive. >> storm chaser.com. if you want more information on the re...

Oklahoma city when a powerful tornado hit, that it sucked the people out of there and they were kill would. what happened the wins compressed if you know about physics, when you reduce the size of the wind that will increase the wind fields it looks tempting, you would be better finding a ravine or ditch. >> get low and not anywhere above ground but get as low as possible. >> i talked to radio stations and giving them live information and i said listen, with these kines of tornados and ef-4s and 5s, you need to be underground. that may be your only way to survive. >> storm chaser.com. if you w...

Forecast. first up, can i get historical perspective from you. the series of devastating storms, look at what it has done and what preceded that and what might we expect the rest of this horrific season. >> that's the big question. we're at the very beginning typically of our severe weather season. most tornadoes are not the big huge strong ones like we saw in this outbreak. about 99.6% are called ef-3 or ef-2 or lower and many of them are ef-0s or 1s. it is the ef-3s and ef-5s, once it gets over 166 miles per hour, so maybe four out a thousand, that's it. those are the ones we dealt with. we ...

As residents across the south assess the damage from the second worst outbreak of tornadoes in u.s. history, scientists say the twister that hit tuscaloosa, alabama, could be the strongest type of tornado that we know to exist. violent tornadoes have winds xwratder than 166 miles an hour causing unprecedented damage. joining me live to help explain this recent phenomenon is the director of the weather service john l. hayes. good morning. let's talk about the type of tornado that scientists think hit tuscaloosa. these violent tornadoes and how often they hit like this. do you have think this is...