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In arkansas, missouri, tennessee and illinois, where six amazon workers have been confirmed dead, after the roof of their warehouse collapsed. jack sillin is a meteorological analyst at cornell university. he explained why the tormados occured and why they were so strong. the reason that we saw tornadoes on this particular day anyway has to do with the storm that moved up to the great lakes and brought all of this warm, moist air from the gulf of mexico up into the midwest and midsouth and that air was forced to rise. we had winds changing speed and direction and that's why you get the spinnin...

The reason that we saw tornadoes on this particular day anyway has to do with the storm that moved up to the great lakes and brought all of this warm, moist air from the gulf of mexico weapon __ up —— up into the midwest and midsouth and that there was forced to rise. we had winds changing speed and direction and that's why you get the spinning in the atmosphere, so the cause for these particular tornadoes was very natural. these types of storms happen all the time. that said, the background environment is sort of shifting in favour of these types of events. you're getting warmer gulf of m...

Information captured by a u.s. military satellite and evidence of a mid-air flash. and we are joined by our correspondent barbara starr. what does this mean? >> well, this flying over sinai saw a heat signature, and this is a hot spot that is different from the natural heat in background environment. it is associated with the aircraft. it happened where the aircraft was flying, and it happened, they saw this signature of heat flash in midair. so it is not when the plane hit the ground. they saw the heat midair. this suggests that this catastrophic event did occur while the plane was in flight....