UPDATE: Tornado Warning issued for Allegheny, Washington and Westmoreland Counties until 5:30.
A Tornado Warning has been issued for Butler and Armstrong Counties in Southwestern PA.
If you are in the area of the tornado, you need to get to a basement or interior room of your home.
Avoid windows and outside walls of the building you are currently in.
The area currently affected is just north of Butler in Northvue and West Sunbury.
A Tornado Watch remains in effect until 8 p.m. through much of Southwestern PA.
The Tornado Warning expires shortly after 5 p.m. Wednesday.