in realtime. it has been used to detect emissions from north korea. the question is which way is the wind blowing right now. >> it is blowing off shore, away from japan. this is a computer model that will model the atmosphere for the next five days. we'll let it stop because it is still moving right now to monday. when it starts again you will notice from right now the wind will be blowing off shore. there's japan right there. follow it around this giant low pressure center, possibly going over the alaska island there, and then back in to eastern russia and then around again and possibly as it moves in -- now, that's a theoretical particle. almost like a balloon that won't go up and down. does radiation act like that, no. but it will get dispersed and a