Officials closed schools, evacuated military aircraft and issued high-water warnings Monday with another round of severe weather potentially including tornadoes forecast for the Southern Plains.

School districts in Oklahoma City, nearby Norman and elsewhere canceled classes as forecasts also call for hail and wind gusts of up to 80 mph (128 kph) in Oklahoma. A flood watch is in effect for the greater Oklahoma City region. Strong winds and hail also are forecast for West Texas where school districts in Abilene and elsewhere were sending students home early.

Tinker Air Force Base near Oklahoma City evacuated several planes to other military installations in anticipation of storm damage. Meanwhile, state workers in several Oklahoma counties were being sent home early on Monday, the sixth anniversary of a tornado in Moore, south of Oklahoma City, that killed more than 20 people.

Oklahoma Gov. Kevin Stitt said in a statement that the state emergency operations center is activated and urged motorists not to drive around barricades or into flooded roadways.

The National Weather Service placed several counties under a tornado watch, calling it a "particularly dangerous situation." The weather service said the storm system will move later Monday into western Arkansas. The threat of severe weather will continue into Tuesday.

It's the latest round of severe weather to strike the region after a spate of tornadoes raked the Southern Plains on Friday and Saturday, leaving widespread damage and some people injured.