this year across the plains and the rockies, but the midwest and east coast haven't seen a lot of these big arctic outbreaks. we knew that would change eventually. as we hit toward the mid-week, that cold dipping all the way down to the gulf coast and the coldest air we've seen this winter season since last winter, and we remember that one. by wednesday we're looking at high temperatures mainly in the single digits across the great lakes and the midwest. that colder air dipping down into the south and northeast cities into the 20s. by thursday morning, the coldest morning we're expecting, single digits and teens across the south, many going subzero in the northern states. all this being ushered in by a band of snow moving down across the ohio valley as we head into this evening, across illinois, indiana and ohio. we could see over a half foot of snow here. and scott, cold is sticking around through the upcoming weekend. >> pelley: eric fisher at the great wbz. eric, thank you very much. in another major story tonight the boston marathon bombing trial began today with jury selection. dzhokhar tsarnaev, the surviving suspect, is accused of murdering three and wounding hundreds.