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The i havenevents were isolated. we see showers and thunderstorms push to the south. green bay out of the woods. chicago, northern cook county, milwaukee, wet weather possibly heading up through the morning. some of the stronger storms in a line here now heading off toward the east. as you get into south central lower michigan, too. closer here, north of chicago, jansville, coming out of madison, we'll watch showers and thunderstorms produce maybe wind, possibly some hail and a lot of lightning. incidentally, there have been 22, 23 lightning deaths so far this year, as thunderstorms continue t...

How strong was that tornado in yazoo city? >> we haven't had the official -- the national weather service has trained experts and they will actually go and sit there and take a look at the damage. usually the scale goes ef-5, the strongest. that means the earth is ripped -- there's thog left. we've had a couple of those. one back in iowa two years ago where literally the town doesn't exist anymore, the houses are off their foundation. then you go down the scale where ef-0 is the weakest. this is on the upper end of the scale. probably around an ef-3 or ef-4 and that means winds were 150 to 180...

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By far, the worst thing i've ever witnessed. >> and so, reynold, these are super tornadoes, make the distinction for us. what separates a super from a regular tornado? >> reporter: what separates a super tornado from your average tornado is a super tornado is what they refer to on the fujita scale, an ef-4 or 5 and they're so incredibly rare. most are on the ef-0 to ef-3. many don't last very long, they form very quickly and dissipate within seconds, most of them. this one was truly one of the exceptions. this is a very large tornado that came through here, winds in excess of 200 miles per hou...

Meteorologist for nearly two decades. i've never seen anything quite like this. by far, the worst thing i've ever witnessed. >> and so, reynold, these are super tornadoes, make the distinction for us. what separates a super from a regular tornado? >> reporter: what separates a super tornado from your average tornado is a super tornado is what they refer to on the fujita scale, an ef-4 or 5 and they're so incredibly rare. most are on the ef-0 to ef-3. many don't last very long, they form very quickly and dissipate within seconds, most of them. this one was truly one of the exceptions. this is a...