thunderstorms, with large hail and strong winds. that's going to be stretching from the dakotas down through texas and even in through illinois. we talked about middle of the week, the threat does enhance for oklahoma by wednesday. >> let's hope they make it through that. thanks so much. >> memorial day marks the unofficial start to summer. that means sun and time to break out the sunscreen. you may find ourself confused when you head to the store asking which is best. >> the answer according to a new report may really surprise you. a lot of money does not necessarily get you the best protection. cnn's senior medical correspondent elizabeth cohen joins us to break it all down for us. elizabeth, who won? what's the best sunscreen? >> all right. i have the list of the top three sunscreens according to consumer reports. and i must say when i was at the store before going to the pool with my kids yesterday i brought it with me because you're confronted by this huge array. you don't know what to get. here are the top three according to consumer reports. up and up sport spf 50 that's a spray from target. equate ultraprotection spf 50 from walmart.