 WTLP Traffic Center presented by Wendell Nation. Get 50% off all styles of windows. Visit WendellNation.com today. Bob Endler, WTLP Traffic. We are under a severe thunderstorm warning here for many parts of Northern Virginia, including Loudoun County, Prince William County. Go right to the radar and tell you where we see the powerful storms here. Most of Loudoun County getting some heavy rain and some higher winds. That's starting to push into Frederick County, Maryland, the western part of Montgomery County, and also through Culpeper, Orange.