Commonwealth Edison is responding to outages across most of northern Illinois on Friday.

ComEd reported more than 33,400 customers were without power as of 12:30 p.m. Some counties were more affected than others, with Cook, DuPage, Grundy, Lake, McHenry, Will and Winnebago seeing some of the highest numbers of customers.

The National Weather Service issued a high wind warning for all of northern Illinois on Friday, with peak wind gusts ranging from 50 to 65 mph, the agency said.

The warning is in effect until 4 p.m.

Damaging winds may knock down tree limbs and power lines. Power outages are possible. “Travel will be difficult, especially for high-profile vehicles,” the NWS said.

If you see a downed wire, leave the area immediately and call ComEd at 800-334-7661.

Prioritizing response

ComEd outlines how it prioritizes its response to reported power outages:

• Downed live wires or potentially life-threatening situations.

• High-voltage transmission lines and equipment, to restore service to the largest number of affected customers.

• Critical public health and safety facilities, such as hospitals, police and fire stations, and water treatment plants.

• Major distribution lines and high-density housing.

• Any remaining smaller neighborhoods and individual homes that have not been restored by prior repair activities.