Forecasters said a moist, unstable air mass is in place across the region, which could cause showers and thunderstorms to increase in coverage throughout Sunday and into Monday.
Due to the already saturated ground, the rainfall could lead to more localized flooding in flood-prone areas throughout the region in both Tennessee and Virginia.
The NWS statement follows a week that saw torrential rains cause record levels of flooding in Kingsport and surrounding areas, including portions of Sullivan County stretching from Orebank to Cook's Valley and southern Scott County.
Dozens of houses, businesses and governmental buildings were impacted by last Wednesday evening’s sudden rain storm that dropped nearly four inches of water in a period of under two hours.
The flooding claimed one home on Lucy Street in Bloomingdale and prompted the Red Cross to open a storm shelter at Lynn View Middle School for those impacted by the rising water.
Roads throughout the city, including many downtown streets and Center Street, were closed because of standing water, and several motorists had to be rescued from stranded cars.