The HRRR (High-Resolution Rapid Refresh) model is presenting development of an interesting line of storms over the Slight Risk and Marginal outlook areas. Storms which can produce hail and damaging winds will develop throughout the night. BT Weather has issued a Level 3 SISR rating for tonight's storms, which means brief tornadoes could also be an issue tonight. Tornadoes are much more likely for the southern portions of the Slight Risk area than the northern portions near Pennsylvania, though nothing has been taken off the table tonight for any region in the outlook zones. 

We're keeping an eye on Pittsburgh, Pennsylvania tonight, as this area is highly populated and has a higher risk than normal for severe weather. This area is not as used to severe weather as the central and southern US. We will be issuing updates all night as things develop.