Deep tropical moisture associated with the remnants of Tropical Storm Nicholas was lifted northward ahead of a strong cold front.  Precipitable water values ranging from 1.9 to 2.2 inches were carried into southern Virginia during the evening of the 21st. Warm rain processes produced localized rainfall rates of 2- to 3-inches per hour during the late evening of the 21st into early on the 22nd, enhanced by orographic lift up the Blue Ridge.  FLASH (Flooded Locations And Simulated Hydrographs Project) data indicated bands of rainfall were producing amounts of 1.5 times flash flood guidance across Floyd and Montgomery Counties, with 10-year annual return intervals in spots near the crest of the Blue Ridge before rainfall diminished toward dawn.  During late afternoon into the evening on the 22nd, a line of thunderstorms developed further east as the cold front advanced across the mountains.   The line of storms stalled across portions of Botetourt and Bedford Counties, while CAPE values of 1,500 J/Kg, provided enough instability to support rainfall rates of 2 to 3 inches per hour.  Despite antecedent dry conditions, the areas heavy rain was sufficient to produce localized flash flooding.

Heavy Rain in ROCKBRIDGE, VIRGINIA
From 22-SEP-21 16:00:00 to 22-SEP-21 18:00:00 (EST-5)
Location: LEXINGTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

An automated weather station (Weather Underground: KVALEXIN33) observed a 2-hour rainfall total of 3.27 inches, which is between about a 100-year rainfall event per NOAA Atlas 14 point frequency estimates for this duration. Rainfall rates between this 2-hour period peaked at a little about 2.5 inches per hour, and remained above 2 inches per hour for about 45 minutes.

Heavy Rain in LEXINGTON (C), VIRGINIA
From 22-SEP-21 16:00:00 to 22-SEP-21 18:00:00 (EST-5)
Location: LEXINGTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

An automated weather station (Weather Underground: KVALEXIN35) observed a 2-hour rainfall total of 2.27 inches, which is between about a 25-year rainfall event per NOAA Atlas 14 point frequency estimates for this duration. Rainfall rates during this 2-hour period remained above 1 inch per hour for about 65 minutes.

Flood in PATRICK, VIRGINIA
From 21-SEP-21 22:30:00 to 22-SEP-21 03:00:00 (EST-5)
Location: KIBLER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Prolonged periods of moderate to occasionally heavy rainfall through the afternoon and evening of the 21st caused Hookers Creek to flood out of its banks, and flood across Hookers Creek Road and Little Dan River Road.  A nearby automated personal weather station indicated that rainfall rates varied from a half inch to an inch at times through the 21st.  No damage to the road was reported.

Flash Flood in PATRICK, VIRGINIA
From 21-SEP-21 22:30:00 to 22-SEP-21 03:00:00 (EST-5)
Location: THE HOLLOW
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Runoff from heavy rainfall, a radar estimated 3.5 to 4 inches inside of a 3-hour period, caused Johnson Creek to flood out of its banks.  East Fork Road was flooded by the creek and impassible until the flooding receded.  No damage to the road was reported.  Rainfall rates were as high as 3 inches per hour per FLASH estimates.

Flash Flood in PATRICK, VIRGINIA
From 21-SEP-21 21:30:00 to 22-SEP-21 03:00:00 (EST-5)
Location: ARARAT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Runoff from heavy rainfall, a radar estimated 4 to 4.5 inches inside of a 3-hour period, caused Dry Run to flood out of its banks. Marigold Lane was flooded by Dry Run and impassible until the flooding receded. No damage to the road was reported. Rainfall rates were as high as 3 to 4 inches per hour per FLASH estimates.

Heavy Rain in PATRICK, VIRGINIA
From 21-SEP-21 20:00:00 to 21-SEP-21 23:00:00 (EST-5)
Location: ARARAT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

An automated weather station (Weather Underground: KVAHILLS12) observed a 3-hour rainfall total of 4.29 inches, which is between a 50- and a 100-year rainfall event per NOAA Atlas 14 point frequency estimates for this duration. Rainfall rates between this 3-hour period peaked at a little over 2.6 inches per hour, and remained above 1 inch per hour for nearly the entire 3-hour duration.

Flash Flood in BEDFORD, VIRGINIA
From 22-SEP-21 16:30:00 to 22-SEP-21 19:00:00 (EST-5)
Location: MONTVALE
Flood cause: Heavy Rain
Property damage: 11.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Heavy rain, falling at prolonged rates of 2 to 3 inches per hour, caused a tributary of Goose Creek to flood out of its banks several inches deep across Crouch Road. The flooding caused the culvert running beneath the road to fail, making the road impassible until the damage was repaired and the culvert replaced.

Flash Flood in LEXINGTON (C), VIRGINIA
From 22-SEP-21 16:45:00 to 22-SEP-21 19:00:00 (EST-5)
Location: LEXINGTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Two to three inches of rain within a 2-hour period, falling at rates or e to 4 inches per hour at times, caused flooding along Highway 60, with reports of water in spots over six inches deep flowing across the roadway.  No damage was reported and the road was passable again after the flooding receded.

Flash Flood in BOTETOURT, VIRGINIA
From 22-SEP-21 17:00:00 to 22-SEP-21 19:15:00 (EST-5)
Location: PICO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Runoff from heavy rain caused a tributary of Ellis Run to flow out of its banks, flooding across portions of Mountain Valley Road.  No damage was reported and the road was passable again after the flooding receded.

Flash Flood in BOTETOURT, VIRGINIA
From 22-SEP-21 17:15:00 to 22-SEP-21 19:15:00 (EST-5)
Location: ARCADIA
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Runoff from heavy rain caused Jennings Creek to flood out of its banks and across Jennings Creek Road, both of which are located in the bottom of a valley with steep sides. Occupants from a vehicle caught in the flooding were able to abandon the vehicle to safety, however the vehicle was reportedly washed down the creek.

Flash Flood in MONTGOMERY, VIRGINIA
From 22-SEP-21 00:45:00 to 22-SEP-21 05:00:00 (EST-5)
Location: CHRISTIANSBURG
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Employee

Runoff from heavy rain was observed overflowing a small creek at the along Phelgar Street and running 6-8 inches deep across the road near the intersection with 2nd Street.  One block downstream, along 1st Street, water was overflowing the banks of the same creek, and was entering Cook's Clean Center.  Water entered the building several inches deep.

Flash Flood in MONTGOMERY, VIRGINIA
From 22-SEP-21 00:40:00 to 22-SEP-21 05:00:00 (EST-5)
Location: CHRISTIANSBURG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Town Branch, a tributary of Crab Creek, was observed overflowing its banks near the intersection of Depot Street and Stone Street, and was flowing several inches deep across the road surface.  The road reopened after flooding subsided, with no damage observed.

Flash Flood in BEDFORD, VIRGINIA
From 22-SEP-21 16:30:00 to 22-SEP-21 19:30:00 (EST-5)
Location: MONTVALE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Heavy rain, falling at prolonged rates of 2 to 3 inches per hour, caused Dry Creek to flood out of its banks several inches deep across Beale Trail Road.  No damage to the road was observed and the road was passable again after flooding receded.

Flood in BEDFORD, VIRGINIA
From 22-SEP-21 16:30:00 to 22-SEP-21 19:30:00 (EST-5)
Location: MONTVALE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Heavy rain, falling at prolonged rates of 2 to 3 inches per hour, resulted in several inches of standing water across Highway 460, making the road impassible until the flood waters receded.  No damage was reported during this event.

Flash Flood in BOTETOURT, VIRGINIA
From 22-SEP-21 16:50:00 to 22-SEP-21 19:15:00 (EST-5)
Location: INDIAN ROCK
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Runoff from heavy rain caused Renick Run to flood out of its banks and flow across Indian Rock Road.  The bridge crossing Renick Run was damaged and impassible by the flooding, and required repair before being eventually reopened.

Heavy Rain in BOTETOURT, VIRGINIA
From 22-SEP-21 15:09:00 to 22-SEP-21 17:13:00 (EST-5)
Location: BUCHANAN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

An automated weather station (Weather Underground: KVABUCHA4) observed a 2-hour rainfall total of 2.77 inches, which is about a 25-year rainfall event per NOAA Atlas 14 point frequency estimates for this duration. Rainfall rates between this 2-hour period peaked at a little over 2 inches per hour, and remained above 1 inch per hour for about 80 minutes.

Flash Flood in BOTETOURT, VIRGINIA
From 22-SEP-21 16:45:00 to 22-SEP-21 19:15:00 (EST-5)
Location: INDIAN ROCK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Runoff from heavy rain caused Purgatory Creek to flood out of its banks around one foot deep across both Greyledge and Frontage Roads.  The roads reopened after flooding subsided.  No damage was reported.

Flash Flood in BOTETOURT, VIRGINIA
From 22-SEP-21 17:00:00 to 22-SEP-21 19:15:00 (EST-5)
Location: BUCHANAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Runoff from heavy rain caused Laurel Run to flood out of its banks across Pico Road, causing the road to be impassible until the flooding receded.  The road was reopened afterward.

Flood in BOTETOURT, VIRGINIA
From 22-SEP-21 16:30:00 to 22-SEP-21 17:45:00 (EST-5)
Location: BUCHANAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Heavy rain caused ponding of water of up to a foot deep along portions of Main Street in the community of Buchanan, making the road impassible.  Main Street was passable again once the flooding receded.  No damage was reported.

Flash Flood in BOTETOURT, VIRGINIA
From 22-SEP-21 16:45:00 to 22-SEP-21 19:00:00 (EST-5)
Location: BUCHANAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Runoff from heavy rain caused Dry Run to flow out of its banks, flooding the railway tunnel on 19th Street and across Highway 11 a few hundred feet further downstream.  No damage was reported and the roads were passable again after the flooding receded.

Debris Flow in AMHERST, VIRGINIA
From 22-SEP-21 23:30:00 to 22-SEP-21 23:30:00 (EST-5)
Location: SNOWDEN
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Heavy rainfall at prolonged rainfall rates of over 1 inch per hour caused a small debris flow to occur along the Blue Ridge Parkway near the James River.  The parkway was reopened after the debris was removed.