Expect showers late Friday night Details >
May 21, 2013; 1:18 AM ET Much cooler tomorrow
The Medical Examiner's Office says 20 children are among the dead killed by a tornado that hit suburban Oklahoma City.
Dangerous storms have formed between Amarillo and Lubbock on Highway 27.
An ongoing cool weather pattern from the Rockies to the East Coast has been helping to keep a lid on the number of tornadoes for 2013.
Temperature and precipitation trends in AccuWeather's 30-Day Forecast can help with Memorial Day planning.