The National Weather Service office in Tulsa has issued a tornado watch for eastern Oklahoma and western Arkansas until 10 p.m. Friday.
Threats include tennis ball–sized hail and wind gusts up to 70 miles per hour.
If there is a tornado, your best option is an underground storm shelter, storm cellar, basement or safe room designed to withstand a tornado.
The next best option is an interior room on the lowest floor of a sturdy building, staying away from doors and windows. Use pillows, couch cushions, sleeping bags, a mattress or blankets to cover up, and wear a helmet if you have them. Put infants in their car seat or carrier.
It's also important to wear long pants, a long sleeve shirt and closed-toed shoes. Charge your cell phone and have it with you, and have a plan for what to do with your pets.