our meteorologist is joining us. >> the cooler air is ahead of or in back of very warm and unstable air in the rockies. we have the setup for tornadoes. unfortunately, overnight tonight for the dallas-ft. worth area. we have a thunderstorm watch moving into the oklahoma region and houston, a tornado watch for you until 10:00 p.m. local time. it looks like we had an earlier tornado warning. it's expired but we have a severe thunderstorm warning south and west of the houston area. let's go on up to dallas. this is the area that we're concerned with the potential of severe weather, including tornadoes in the overnight hours and people are sleeping. noaa weather radios are on. very warm and unstable air mass ahead of this front that moves through overnight tonight.