>> i've never seen anything like this by far. i've been four hours, gone maybe 40 miles. >> you can't fight mother nature. she's going to play whatever she's going to play. >> she's going to play so they're using their gps to avoid this part of the country. in memphis, tennessee, floodwaters are threatening hundreds of homes right now. emergency officials predict nearly 3,000 properties in the memphis area could be impacted by flooding if the mississippi crests at 48 feet this weekend. that would be the river's highest level since 1937. right now it's approaching 46 feet. >> y were mentioning the towns adjacent or abutting big rivers in this country have the high water mark on important buildings in the city and many places there will be a new high water mark. david mattingly is in memphis this morning. a slow-moving story and won't peak until next week. >> that's right. inch by inch, this river is on the move. we're at 46 feet right now. expecting a couple of more feet