High pressure was established across the lower Mid-Atlantic during the evening of August 25th, allowing for only widely-scattered showers and thunderstorm development, mainly confined along and west of the Blue Ridge.  Wind speeds in the lower levels of the atmosphere were generally less than 10 mph from the northwest, supporting only very slow movement of the convection.  Dry air associated with the high pressure limited precipitable water values that evening to 1.23 inches per the August 26th 00Z upper air sounding performed by NWS Blacksburg, which is very near the 50th percentile for late August.  One slow moving thunderstorm developed over northern Roanoke County and tracked slowly southeast along the Botetourt County line.  The storm intensified near the community of Cloverdale and produced heavy rainfall between 8 pm and 10 pm EDT at rates of 2 to locally 4 inches per hour.  Some flooding issues were noted, particularly along Tinker Creek which rose 8 feet in under 2 hours.  While the rainfall was intense and justified the issuance of a flash flood warning given the higher population density of the area, the small footprint of the heavy rain, semi-rural nature of the area impacted and the late evening hour limited evidence of flash flooding in the area.

Flood in ROANOKE, VIRGINIA
From 25-AUG-22 21:55:00 to 25-AUG-22 21:55:00 (EST-5)
Location: BONSACK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The stream gauge at Tinker Creek Upper Above Columbia Street (TKRV2) recorded Tinker Creek rising more than 8 feet within 2 hours to crest at 10.67 feet, before stream levels quickly receded. This was caused by 2 to more than 4 inches of rainfall from a thunderstorm near the Botetourt County border.

Flood in ROANOKE, VIRGINIA
From 25-AUG-22 22:10:00 to 25-AUG-22 23:40:00 (EST-5)
Location: VINTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The stream gauge at Tinker Creek Above Glade Creek recorded Tinker Creek cresting at 7.95 feet. This was caused by 2 to more than 4 inches of rainfall from a thunderstorm near the Botetourt County border.

Heavy Rain in BOTETOURT, VIRGINIA
From 25-AUG-22 18:20:00 to 25-AUG-22 20:20:00 (EST-5)
Location: CLOVERDALE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A personal weather station (Weather Underground: KVAROANO272) recorded 4.19 inches of rain from a thunderstorm falling during a 2-hour period from 7:20 pm to 9:20 pm on the 25th. This is nearly a 500-year rainfall event per NOAA Atlas 14 Point Precipitation Frequency estimates. Runoff from this rainfall entered Tinker Creek.

Heavy Rain in BOTETOURT, VIRGINIA
From 25-AUG-22 17:50:00 to 25-AUG-22 19:20:00 (EST-5)
Location: AMSTERDAM
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A personal weather station (Weather Underground: KVADALEV11) recorded 2.64 inches of rain from a thunderstorm, falling during a 90-minute period between 6:50 pm and 8:20 pm on the 25th. Rainfall rates were at one point observed as high as 4 inches per hour. This is between a 25- and 50-year rainfall event per NOAA Atlas 14 estimates.  Runoff from this rainfall entered Tinker Creek.

Heavy Rain in ROANOKE, VIRGINIA
From 25-AUG-22 18:15:00 to 25-AUG-22 20:10:00 (EST-5)
Location: MEDLEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A personal weather station (Weather Underground: KVAROANO242) recorded 3.84 inches of rainfall from a thunderstorm, which fell within a 2-hour period from 7:15 pm and 9:10 pm on the 25th. Rainfall rates were estimated to be as high as 1.7 inches per hour. This is about a 200-year rainfall event per NOAA Atlas 14 estimates. Runoff from this rainfall entered Carvin Creek and eventually Tinker Creek.

Flood in BOTETOURT, VIRGINIA
From 25-AUG-22 21:00:00 to 25-AUG-22 21:00:00 (EST-5)
Location: CLOVERDALE
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Department of Highways

Runoff from heavy rainfall overwhelmed an underground storm water pipe, which created a sinkhole in a portion of Highland drive near Sanderson drive.