OKLAHOMA CITY (AP) -- The National Weather Service says storms with very large hail and heavy rain are expected across much of Oklahoma and into Arkansas.
Hail the size of tennis balls is the main threat, but that localized flash flooding is possible and tornadoes can't be ruled out.
The storm is expected to move eastward during the night with hail and heavy rain forecast for eastern Oklahoma and into northwestern Arkansas before moving out of the region by mid-afternoon Monday.
