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[00:11.40]Here to deliver your Thursday edition of CNN STUDENT NEWS,
[00:14.42] I'm Carl Azuz from the CNN Center in Atlanta, Georgia.
[00:17.71]First up, severe weather.
[00:19.45]While folks in Indiana and Illinois were concerned about possible blizzard conditions last night,
[00:26.02]tornado watches and warning stretched along the U.S. East Coast one day after this happened.
[00:31.00]Twisters caused severe damage across the south Tuesday.
[00:34.83]Parts of Louisiana, Mississippi, Alabama and Florida were all hit.
[00:38.85]As many as 25 tornadoes were reported.
[00:42.02]At least three people were killed and dozens of others were injured.
[00:45.80]Florida's governor declared a state of emergency in two counties to speed up government help to people there.
[00:52.02]Cars were flipped, trees were flung, apartment buildings were crushed in communities along the Florida Panhandle.
[00:58.54]Jennifer Gray looks at what's done in the days immediately following a disaster.
[01:02.65](BEGIN VIDEOTAPE)
[01:03.08]JENNIFER GRAY, AMS METEOROLOGIST: In the Pensacola area,
[01:04.68] cleanup has been on the minds of the residents here and they have been busy doing that.
[01:10.30]Look behind me, a lot of homes in this neighborhood.
[01:12.98]The roofs completely ripped off, other roofs partially damaged, but a lot of cleanup underway.
[01:18.91]Power crews have been in here.
[01:20.09]People have been removing limbs,
[01:21.56]fences, everything that has gotten in the way that was thrown about by this tornado.
[01:28.16]And then, look behind me.
[01:28.95]You can see the damage widespread in this one particular neighborhood.
[01:32.73]A lot of roofs looking like this.
[01:34.21]People busy today, putting tarps over their houses as well,
[01:38.63] trying to rebuild what is left from this devastating tornado.
[01:44.58]This morning, when we saw the first signs of daylight,
[01:47.29] it was pure devastation for certain areas in this community
[01:50.83]and they have a long way to go before the cleanup is finished.
[01:54.37]CHAD MYERS, AMS METEOROLOGIST: Technically, a tornado is just a violent,
[01:56.52]rotating column of air coming out of the bottom of a thunderstorm,
[01:58.85] but it takes a lot to get that violently rotating column to come out.
[02:02.97]All you need for a tornado really to form though are thunderstorms and a jet stream.
[02:08.53]That jet stream is a loft.
[02:09.44]It makes the energy, if you have moisture at the surfaces, dry air, cold air,
[02:12.86]pushing that moisture up, you can get a tornado to form in any state.
[02:15.97]Those days where all the ingredients combine, you get the humidity,
[02:19.77]you get the dry air, you get the jet stream, you get upper energy in the jet stream.
[02:23.39]You get winds churning as you go aloft.
[02:27.19]Those are the ingredients that caused a big tornado day.
[02:29.18]The greatest threat of a tornado is being hit by something that the tornado is moving.
[02:33.85]If you're outside or if you're not protected inside,
[02:36.62]if you're hit by a 140-mile-per-hour two-by-four, you're going to be killed.
[02:40.56]So, you need to be inside and the lowest level,
[02:43.65]somewhere in the middle of the home away from windows.
[02:46.02]When you hear the word "warning" and you hear your county, that's when you need to take cover.
[02:52.30]When you hear the word "watch", that means something might happen today.
[02:57.96]Let's have a plan.
[02:58.83]When you hear the word "warning", it's too late to make a plan.
[03:01.02]You need to already have the plan.
[03:02.46]Warning is the long word, it's the bad one.
[03:05.36](END VIDEOTAPE)
[03:05.78]AZUZ: There's something eerie about today's "Roll Call" and there's plenty to lake about it.
[03:14.65]What?
[03:15.21]The city of Erie, Pennsylvania, it's on Lake Erie.
[03:17.54]And it's home to McDowell High School.
[03:20.03]Let's go Trojans.
[03:21.78]On the West Coast, Siuslaw Middle School is in Florence,
[03:24.74]Oregon, and it's where the Vikings are standing guard.
[03:27.70]And on the southwest coast of Sweden, we come to the city of Gothenburg.
[03:33.36]Welcome to all of our viewers in Nya Pavelundsskolan.
[03:35.63]Returns are in from the latest event on the U.S. election calendar.
[03:39.85]The state of Nevada held its Republican presidential caucuses on Tuesday.
[03:45.47]The winner: businessman Donald Trump.
[03:46.44]He earned about 46 percent of the vote.
[03:48.86]In second was Florida Senator Marco Rubio, with almost 24 percent.
[03:53.31]In third, Texas Senator Ted Cruz with a little more than 21 percent.
[03:57.32]The next contest will be in South Carolina.
[04:00.00]It's Democratic presidential primary.
[04:02.67]It's this Saturday.
[04:03.48]And after that, it's what's called Super Tuesday.
[04:06.96]On March 1st, voters in 15 states will choose their favorite candidates.
[04:12.24]Only one Republican and one Democrat will be in the presidential ballot this November.
[04:18.61]Super Tuesday has tremendous influence over who those candidates will be.
[04:21.44]Now, let's get more specific.
[04:23.31]When we say a Democrat or a Republican won the states nominating contest,
[04:26.91]what we mean is that they likely won the most delegates.
[04:30.58](BEGIN VIDEOTAPE)
[04:31.01]REPORTER: You've seen them wearing funny hats and waving signs at national party conventions.
[04:37.68]SEN.BERNIE SANDERS (I-VT), PRESIDENTIAL CANDIDATE: Delegates.
[04:38.57]DONALD TRUMP (R), PRESIDENTIAL CANDIDAE: Delegate.
[04:39.86]SEN.TED CRUZ (R-TX), PRESIDENTIAL CANDIDATE: Delegates.
[04:41.00]GOV.JOHN KASICH (R-OH), PRESIDENTIAL CANDIDATE: Delegates.
[04:41.42]REPORTER: Candidates covet them,
[04:42.15]but what exactly is a delegate and why they're so important to the U.S. presidential race?
[04:48.64]They come all 50 states, Washington, D.C., and every U.S. territory.
[04:52.73]Bigger, more populous states like California, Texas, Florida and New York have more of them.
[04:59.01]For the most part, candidates win delegates through primaries and caucuses.
[05:02.82]While the rules vary from state to state, generally, more votes means more delegates.
[05:08.92]This summer, thousands of delegates will come together at their national party conventions,
[05:14.99]where they declare the support for a specific candidate.
[05:16.81]UNIDENTIFIED MALE: Ohio, Madam Secretary,
[05:19.62]casts all 188 votes for the president and the next president of the United States, Barack Obama.