Updated 8/20/11 12:15 p.m.

CHICAGO (STMW) – A severe thunderstorm warning that was in effect for northwestern Cook and southern Lake counties that could produce “deadly lightning’’ and quarter-sized hail has expired but gusty winds are still possible, according to the National Weather Service.

At 10:14 a.m., doppler radar indicated a line of severe storms capable of producing quarter-sized hail and damaging winds in excess of 60 miles per hour in the far north and northwest suburbs and moving east at 35 miles per hour, according to the NWS.

The NWS said “very heavy rain’’ and “deadly lightning’’ was possible but the warning expired at 10:30 a.m. as the storm has weakened and no longer poses an immediate threat to life or property, accoridng to the NWS.

Gusty winds from 40 to 50 mph are still possible, according to the NWS.

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