Flash Flooding Hits South Dakota, Virginia and Pennsylvania After Heavy Overnight Rain

The National Weather Service has issued multiple flash flood and flood warnings across parts of South Dakota, Virginia and Pennsylvania after thunderstorms dropped 1.5 to 4 inches of rain overnight, with flash flooding already occurring in several locations.

Active Flash Flood and Flood Warnings

The National Weather Service in Aberdeen has issued a Flash Flood Warning for West Central Brown County in northeastern South Dakota until 800 AM CDT Wednesday. [1] Trained weather spotters reported thunderstorms producing heavy rain across the warned area at 143 AM CDT. [1] Between 1.5 and 3.5 inches of rain have fallen with additional rainfall amounts up to 1 inch possible in the warned area. [1]

A Flood Warning remains in effect until 800 AM CDT Wednesday for Southwestern Day County in northeastern South Dakota. [4] Doppler radar indicated heavy rain due to thunderstorms at 111 AM CDT. [4] Between 2 and 4 inches of rain have fallen in that area. [4]

The National Weather Service in Wakefield has issued a Flash Flood Warning for Northwestern Essex County, Northwestern Richmond County and Southeastern Westmoreland County in east central Virginia until 515 AM EDT. [3] Doppler radar indicated thunderstorms producing heavy rain across the warned area at 219 AM EDT. [3] Up to 3 inches of rain have fallen with additional rainfall amounts of 1 to 2 inches possible in the warned area. [3]

Local law enforcement reported flash flooding across Armstrong County in Pennsylvania at 202 AM EDT. [5] Between 1.5 and 2.5 inches of rain have fallen in that area. [5]

South Dakota Thunderstorms Trigger Flooding

In west central Brown County the Flash Flood Warning highlights that flash flooding is already occurring from thunderstorms. [1] Trained weather spotters confirmed the heavy rain producing conditions that led to this immediate hazard. [1] The warning covers the period through 800 AM CDT Wednesday with the possibility of up to 1 inch more rain. [1]

Southwestern Day County faces a Flood Warning that states flooding of rivers, creeks, streams and other low-lying and flood-prone locations is imminent or occurring. [4] Doppler radar observations at 111 AM CDT showed the heavy rain from thunderstorms driving these conditions. [4] The total rainfall recorded there reached between 2 and 4 inches. [4]

These two warnings in northeastern South Dakota demonstrate the widespread effect of the same thunderstorm system on adjacent counties. [1][4] The National Weather Service alerts emphasize both the flash flood hazard in Brown County and the broader flooding impacts expected in Day County. [1][4]

Virginia Sees Heavy Overnight Rain

Doppler radar observations in east central Virginia captured thunderstorms producing heavy rain across Northwestern Essex County, Northwestern Richmond County and Southeastern Westmoreland County. [3] Up to 3 inches of rain have already fallen in the warned area with 1 to 2 inches more possible before the warning expires at 515 AM EDT. [3]

The Flash Flood Warning issued by the National Weather Service in Wakefield focuses on these three specific counties. [3] Radar data at 219 AM EDT confirmed the intensity of the rainfall that prompted the alert. [3] Residents in the affected portions of east central Virginia are advised to monitor conditions closely through the early morning hours. [3]

Law Enforcement Reports Flash Flooding in Pennsylvania

Local law enforcement reported flash flooding in Armstrong County after 1.5 to 2.5 inches of rain fell. [5] The impacts include flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. [5]

Specific locations mentioned in the report include East Brady where flash flooding is expected. [5] Roadway flooding was also reported near West Hills. [5] The Flash Flood Warning draws directly from these law enforcement observations at 202 AM EDT. [5]

The hazard stems from heavy rain that produced rapid runoff across the county. [5] Law enforcement serves as the source confirming both the rainfall totals and the resulting flooding in these locations. [5]

What to watch next

Warnings remain active until 800 AM CDT Wednesday in the South Dakota counties and until 515 AM EDT in the Virginia counties, with ongoing monitoring of rainfall and flooding conditions advised in all affected areas.