307 PM EDT Thu Jun 18 2020 Potter-Northern Clinton-Tioga-Northern Lycoming-Sullivan- Southern Clinton-Southern Lycoming-Union-Montour-Northumberland- Columbia- 307 PM EDT Thu Jun 18 2020 .NOW... A cluster of showers and thunderstorms will continue to move northwest across the Upper Susquehanna Valley region of Pennsylvania. At 3 PM, most of the activity was from near a Wellsboro, Williamsport line, eastward across the endless mountains. The southern edge of the activity was just north of Interstate 80. Some storms will contain brief torrential downpours. The activity is moving northwest at 30 mph.