A half dozen tornadoes spotted in Great Plains states caused no major damage but kicked off what's expected to be a busy week of severe weather.

The Storm Prediction Center in Norman, Oklahoma, says six tornadoes were reported Monday in Iowa, Nebraska, Oklahoma and Texas, but there were no reports of serious damage or injuries. More storms are in the forecast all week, with Kansas, Nebraska, Oklahoma and northeastern Colorado in the crosshairs on Tuesday.

Forecasters say two separate but sparsely populated areas could see tornadoes and large hailstones on Tuesday: western Oklahoma and south-central Kansas, and southwestern Nebraska and northeastern Colorado.

On Thursday, forecasters say tornadoes are possible in Texas, Oklahoma and Kansas.