Update: Severe thunderstorm warning for Allegheny and Butler counties likely to expire at 2:15 p.m.

Update: Severe thunderstorm warning for Allegheny and Butler counties likely to expire at 2:15 p.m.

The warning was active for Allegheny and Butler counties."The storm which prompted the warning has weakened below severe limits, and no longer poses an immediate threat to life or property. Therefore, the warning will be allowed to expire," says the National Weather Service.