A stacked upper level low pressure system drifted from the Ohio River Valley to eastern Kentucky during the early morning hours of the 20th. South-southeasterly windflow around the low was efficient in transporting deep moisture into the area from the coastal Carolinas, allowing precipitable water values to rise into the 1.5 to 1.7 inch range along the crest of the Blue Ridge in Virginia south of Roanoke. Winds were nearly unidirectional with height around the low, with speeds varying between 15kt and 25kt between 925mb and 500mb per Storm Prediction Center Mesoscale Analysis.  Most-Unstable CAPEs along the Blue Ridge varied between 500 and 750 J/Kg through the night, but increased to around 1,000 J/Kg at around 5 AM/09 UTC as a wave of energy passed across the area. Multiple bands of training cells developed along the Blue Ridge.

Flash Flood in PATRICK, VIRGINIA
From 20-JUN-23 07:15:00 to 20-JUN-23 10:30:00 (EST-5)
Location: WOOLWINE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Rock Castle Creek was observed overflowing its banks across Lee Elgin Road several inches deep.  No damage to the road was reported.

Flash Flood in PATRICK, VIRGINIA
From 20-JUN-23 07:15:00 to 20-JUN-23 10:30:00 (EST-5)
Location: BUFFALO RIDGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Little Sycamore Creek was observed overflowing its banks and flowing several inches deep across Pilson Sawmill Road.  No damage was reported.

Flash Flood in PATRICK, VIRGINIA
From 20-JUN-23 07:15:00 to 20-JUN-23 10:30:00 (EST-5)
Location: CHARITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Little Widgeon Creek was observed flowing out of its banks and across Woods Gap Road several inches deep.  No damage to the road was reported.

Flash Flood in FLOYD, VIRGINIA
From 20-JUN-23 07:00:00 to 20-JUN-23 10:30:00 (EST-5)
Location: FLOYD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flooding was observed near along Dodd Creek near Haycock Road and the Blue Ridge Parkway.

Heavy Rain in FLOYD, VIRGINIA
From 19-JUN-23 07:00:00 to 20-JUN-23 07:00:00 (EST-5)
Location: FLOYD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A personal weather station recorded a 24-hour rainfall total ending 8:00 AM EDT on the 20th of 3.87 inches.

Flash Flood in FLOYD, VIRGINIA
From 20-JUN-23 07:00:00 to 20-JUN-23 10:30:00 (EST-5)
Location: FLOYD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Water was observed flowing several inches deep over Woods Gap Road as Dodd Creek flooded out of its banks.

Heavy Rain in FLOYD, VIRGINIA
From 19-JUN-23 07:00:00 to 20-JUN-23 07:00:00 (EST-5)
Location: CHECK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A personal weather station recorded a 24-hour rainfall total ending 8:00 AM EDT on the 20th of 4.26 inches. Runoff from this location flows into the Little River.

Heavy Rain in PATRICK, VIRGINIA
From 19-JUN-23 07:00:00 to 20-JUN-23 07:00:00 (EST-5)
Location: WOOLWINE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A personal weather station recorded a 24-hour rainfall total ending 8:00 AM EDT on the 20th of 3.66 inches. Runoff from this location flows into the Smith River.