institute for drug abuse showed marijuana use in adolescence leads to problems with short term memory and lower iq and researchers point to studies showing that pot is addictive. but addiction experts counter that. marijuana is much less addictive than tobacco or alcohol. here's a look at the nation's weather. a narrow band of severe thunderstorms extends from colorado clear out to the coast of the carolinas and up into northern michigan. showers will also stretch from new england into virginia. otherwise the rest of the nation will be clear. most of the northern half of the country in the 70s. temperatures will be summer-like in the 80s in the south. it will heat up in the 90s in the southwest. 108 degrees for phoenix. they are expecting clear skies in iowa today. good news for the thousands of people attending the world pork expo. >> we looked this up and on today's official schedule is what is called the big grill. we suspect this is what the big grill looks like. all of those people have to eat, right? >> seriously, though, the three-day trade show is big