Slow-moving thunderstorms trained across southern Highland County, forming in an environment of CAPE exceeding 2,500 J/Kg and Precipitable Water of around 1.5 inches.  The storms produced 2.5 to 4 inches of rainfall amounts over a 2 to 3-hour period, with rainfall rates at times reaching 5 to 6 inches per hour.  Steep terrain in the Back Creek basin aided in creating efficient runoff to cause the stream gauge at Back Creek at Sunrise to rise to 10.01 feet, exceeding Moderate Flood Stage set at 10 feet.  This is the highest this gauge has risen since 2008.  FLASH estimated that rainfall just upstream from the stream gauge was over 3 times greater than 1-hour Flash Flood Guidance.  CREST Unit Streamflow was estimating over 1,000 cfs per square mile, whiile CREST 1-hour Average Return Interval estimates put this rainfall at well over a 200-year event.

Flood in BATH, VIRGINIA
From 13-JUN-21 18:10:00 to 13-JUN-21 22:05:00 (EST-5)
Location: MOUNTAIN GROVE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The stream gauge at Back Creek at Sunrise (SUNV2) crested at the Moderate Flood Stage of 10.01 feet (4,370 cfs) at 8:00 pm EST, the highest level observed at this gauge since 2008.  This crest was less than a 5-year event per USGS StreamStats estimates for this gauge.  No impacts of the flooding were reported, perhaps due to the rural nature of land use surrounding the gauge.

Heavy Rain in BEDFORD, VIRGINIA
From 13-JUN-21 17:44:00 to 13-JUN-21 18:44:00 (EST-5)
Location: BIG ISLAND
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A personal weather station in the Big Island area (Weather Underground: KVABIGIS8) recorded a rainfall amount from a thunderstorm of 2.76 occurring in less than 1 hour.  This amount is between a 50 and 100-year rainfall event per NOAA Atlas 14 Point Precipitation Frequency estimates.

Flash Flood in BEDFORD, VIRGINIA
From 13-JUN-21 19:40:00 to 13-JUN-21 22:30:00 (EST-5)
Location: COLEMAN FALLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Heavy rain from a thunderstorm caused Indian Run to flood out of its banks and flow across Fontella Road, causing the road to become impassible.  The road was reopened after the flood waters receded.

Heavy Rain in BATH, VIRGINIA
From 13-JUN-21 15:34:00 to 13-JUN-21 17:34:00 (EST-5)
Location: BURNSVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A personal weather station (Weather Underground: KVAMONTE15) recorded 3.20 inches or rainfall during a 2-hour period in the afternoon of June 13th.  Per radar estimates, this appeared to be outside of the area of heaviest rainfall across Highland County.  This location is also outside of the Back Creek basin, but close enough to be representative.  At this location, this was a 25-year event per a NOAA Atlas 14 Point Precipitation Frequency estimate.

Flash Flood in BEDFORD, VIRGINIA
From 13-JUN-21 19:30:00 to 13-JUN-21 22:30:00 (EST-5)
Location: BIG ISLAND
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Nearly 3 inches of rain fell from a thunderstorm inside of a 1 hour period of time in the Big Island area, including along Camden Road.  Rainfall rates were observed to be as high as 5 inches per hour at times during the event.  Runoff from this rainfall caused Camden Road to become flooded by several inches of water and impassible.  Water was also reported by law enforcement entering a basement of a home.  FLASH (Flooded Locations and Simulated Hydrographs Project) estimated that 1-hour rainfall was about 2.5 times that of Flash Flood guidance and that this was a 25 to 50-year event per FLASH 1-Hour ARI estimates.