GOODLAND (AP) — Snow has started falling in Kansas as forecasters warn of a mixture of blizzard conditions and strong thunderstorms.

The Kansas Highway Patrol said in a tweet that "It has started!" The tweet says heavy snow is falling at the Kansas-Colorado line. Visibility is down to less than a quarter mile, and gusts of up to 80 mph are expected.

Kansas transportation officials are warning that highway closures are expected.

The National Weather Service has issued blizzard warnings for more than a dozen counties in northwest Kansas. Thundersnow has been reported, a condition in which thunderstorms combine with snow.

More serious thunderstorms are expected in the eastern half of the state.

The Storm Prediction Center in Norman, Oklahoma, says very large hail and a few tornadoes are possible.