Emergency workers responded to an unconfirmed report of a tornado near the North Texas Regional Airport around 12:30 p.m. Wednesday.
Officials talking over the radio gave the order to sound the sirens at the north end of the airport at 12:32. Workers talking over the radio gave reported power lines down at the airport and Grayson County College.
Reports are still unconfirmed, but individuals should monitor the weather and seek shelter if they hear sirens.
At 12:41 the National Weather Service issued a severe thunderstorm warning for the Grayson County area. Very heavy rain and wind gusts up to 40 miles per hour are likely with the storm.