The Storm Prediction Center has issued a severe thunderstorm watch until 2am for the following counties, Adair, Adams, Appanoose, Cass, Clarke, Decatur, Lucas, Madison, Marion, Monroe, Ringgold, Taylor, Union, Warren, Wayne, Harrison MO, Mercer MO, Putnam MO, Worth MO. Storms have developed across SE Nebraska, SW Iowa and NW Missouri. Along with the threat of large hail and damaging winds, some heavy rain and cloud to ground lightning is possible as well.