Nightly News   |  April 24, 2011

More strong storms lining up across US?

NBC’s Kate Snow speaks with Samantha Mohr of The Weather Channel.

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This content comes from Closed Captioning that was broadcast along with this program.

>> as we said, we're tracking another powerful set of storms that could, believe it or not, be even stronger. and affect nearly half the country. let's get the latest from the weather channel 's samantha mohr tonight. good evening.

>> reporter: good evening, kate. the problem is it is going to be some of the same areas that have been targeted so far will be targeted again. and look at the difference in the air temperature north and south of this front. it is very warm, moist and unstable on the southern side of this. and very cool, in the 50s, on the northern side of this stationary front . the stage is set as a very active jet stream aloft brings in a series of disturbances this week. that's going to cause a lot of problems here for dallas. and to st. louis again, little rock , indianapolis, likely to see severe storms that could spawn tornados into monday. tuesday, the same area, plus some, into the ohio valley as that low moves into the great lakes. then it pushes further east. we're talking the tennessee valley , louisville, cleveland and over into the d.c. area. by the end of the week, we could be talking the entire eastern seaboa seaboard. we're talking 40% of the nation, kate, would be affected by this outbreak.

>> samantha mohr, thank you.