Graphic by National Weather Service of Pittsburgh

Skies are darkening above Butler County Monday morning as weather experts are calling for showers and possible severe thunderstorms.

The National Weather Service of Pittsburgh around 3:14 a.m. placed a hazardous weather outlook on the county.

“Isolated severe thunderstorms are possible this morning through early afternoon,” the alert said. “Damaging wind gusts and hail are the main hazards.”

In a 7 a.m. Tweet, the service updated this forecast to include heavy downpours and hail sized up to a nickel.

According to the service’s forecast, the weather should break during the afternoon, and Monday night should be clear.