UPDATE: Walnut-sized hail expected with tornado to hit North Texas Sunday

On Sunday at 12:11 a.m. the National Weather Service issued an updated tornado warning. The warning is for Collin, Fannin and Hunt counties.

Walnut-sized hail (1.5 inches) is expected with the incoming storm.

"At 12:11 a.m., a severe thunderstorm capable of producing a tornado was located near Blue Ridge, or 15 miles northwest of Greenville, moving east at 30 mph," says the NWS. "Flying debris will be dangerous to those caught without shelter. Mobile homes will be damaged or destroyed. Damage to roofs, windows, and vehicles will occur. Tree damage is likely."

Prepare for the tornado to impact the following locations:

• Celeste around 12:15 a.m.

• Wolfe City around 12:25 a.m.

• Commerce around 12:45 a.m.

Other locations impacted by this tornadic thunderstorm include Dial, Neylandville, Ladonia, Bug Tussle, Fairlie, Kellogg, Frognot, South Sulphur, Kingston, and Bailey.

The NWS adds, "Take cover now! Move to an interior room on the lowest floor of a sturdy building. Avoid windows. If you are outdoors or in a vehicle, move to the closest substantial shelter and protect yourself from flying debris. Tornadoes are extremely difficult to see and confirm at night. Do not wait to see or hear the tornado. Take cover now!"

This warning is in effect until 1 a.m.

Tips for finding shelter during a tornado

According to the NWS, acting quickly is key to staying safe during a tornado. Continue to listen to local news or a NOAA Weather Radio to stay updated about tornado watches and warnings.

• If you are indoors: If you find yourself under a tornado warning, immediately seek refuge in your basement, safe room, or an interior room without windows. If there's enough time, bring your pets with you.

• If you are at your workplace or school: Comply with your tornado drill procedures and head to the designated tornado shelter area. Steer clear of windows and avoid large open spaces like cafeterias, gymnasiums, or auditoriums.

• If you are outside: In the face of an approaching tornado, find shelter within a sturdy building. Be aware that sheds, storage facilities, mobile homes, and tents are not safe alternatives.

• If you are in a vehicle: Being inside a vehicle during a tornado is not a safe option. Drive towards the closest shelter. If reaching a safe shelter is not possible, either crouch down in your car and shield your head, or leave your vehicle and find shelter in a ditch or ravine.

Do you have an emergency kit ready in case of a tornado?

The Federal Emergency Management Agency recommends keeping the following items in a basic disaster supplies kit:

• Water, one gallon per person for at least three days

• Food, at least a three-day supply

• Cell phone with chargers and a backup battery

• Battery-powered or hand-crank radio

• Flashlight

• First-aid kit

• Whistle

• Dust mask to filter contaminated air

• Plastic sheeting and duct tape, for shelter purposes

• Moist towelettes, garbage bags, and plastic ties

• Manual can opener for food

• Local maps

Source: The National Weather Service