The Storm Prediction Center has issued a TORNADO watch effective until 11pm for the following counties, Plymouth, Sioux, Woodbury, Dakota NE, Thurston NE and Union SD. Storms are beginning to fire across Nebraska and South Dakota this afternoon and are moving to the east. Along with the tornado threat, large hail and damaging winds will be possible as well. Heavy rain is also possible with some localized flooding with any storms that may train over the same areas.