NORMAN, Okla. (AP) — Meteorologists are finding that it’s easier to forecast stormy weather than it is to predict what goes on in the human mind.

As the nation’s midsection braces itself for possible tornadoes Tuesday, researchers have yet to determine when to raise a general alarm. With too much notice, people might try to flee in their cars, putting them at greater risk.

For now, the Storm Prediction Center is reminding people in general that it’s late April and tornado season is upon us. Forecasters suggest cleaning out the storm shelter and buying a weather radio — but get some gas for the chain saw just in case.

The center is telling emergency officials a severe weather outbreak is possible across Oklahoma on Tuesday, with storms also from Dallas to Wichita, Kansas.