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 the northwestern portion of North Carolina during the evening of the 21st.  Warm rain processes produced efficient rainfall rates of 2- to 4-inches per hour, enhanced by orographic lift up the Blue Ridge.  Portions of northeast Surry County received locally in excess of nine inches or rain, with FLASH ( Flooded Locations And Simulated Hydrographs Project) Crest Unit Streamflows indicated six-hour Average Recurrence Intervals for this area for rainfall was between a 100- and 200-year event in spots.

Heavy Rain in SURRY, NORTH CAROLINA
From 21-SEP-21 07:00:00 to 22-SEP-21 07:00:00 (EST-5)
Location: ARARAT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

An automated weather station (Weather Underground: KNCARARA1) observed a 24-hour rainfall total, ending 8 AM EDT, of 6.18 inches, which is about a 25-year rainfall event per NOAA Atlas 14 point frequency estimates for this duration. This event includes 3.57 inches of rain which fell between 9 PM and midnight on the 21st, which is between a 25- and 50-year event per NOAA Atlas 14.

Heavy Rain in SURRY, NORTH CAROLINA
From 21-SEP-21 07:00:00 to 22-SEP-21 07:00:00 (EST-5)
Location: FLAT ROCK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

An automated weather station (Weather Underground: KNCMOUNT12) observed a 24-hour rainfall total, ending 8 AM EDT, of 6.73 inches, which is between a 25- and 50-year rainfall event per NOAA Atlas 14 point frequency estimates for this duration. This event includes about 4.47 inches of rain which fell between 9 PM and midnight on the 21st, which is between a 100- and 200-year event per NOAA Atlas 14.  Rainfall rates between this 3-hour period continuously ranged between 1.5 and 2.5 inches per hour.

Heavy Rain in SURRY, NORTH CAROLINA
From 21-SEP-21 06:55:00 to 22-SEP-21 06:55:00 (EST-5)
Location: MT AIRY SURRY CO ARP
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The AWOS at the Mt. Airy Surry County Airport (KMWK) observed a 24-hour rainfall total, ending 755 AM EDT, of 7.65 inches, which is between a 50- and 100-year rainfall event per NOAA Atlas 14 point frequency estimates for this duration.

Flood in SURRY, NORTH CAROLINA
From 21-SEP-21 20:45:00 to 22-SEP-21 01:00:00 (EST-5)
Location: TOAST
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Emergency Services personnel in the community of Mt. Airy reported that portions of both North Franklin and South Franklin Streets were under several inches of standing water as storm sewers were overwhelmed by prolonged periods of heavy rainfall.  Portions of both roads were impassible until the water receded.  No damage or injuries were reported.

Flash Flood in SURRY, NORTH CAROLINA
From 21-SEP-21 22:30:00 to 22-SEP-21 03:00:00 (EST-5)
Location: BANNERTOWN
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Multiple roads between the communities of Mt. Airy and Ararat were flooded and impassible by as much as a foot of flowing water over the roadways in spots.  This was caused by heavy rainfall of 3 to locally 5 inches within a 3-hour period that caused several streams and creeks to overflow their banks across the roadway surface.  Roads that were reported impassible by flood waters included, but were not limited to, Hiatt Road at Stoney Creek, Quaker Road at Faulkner Creek, Armstrong Road by Flat Shoal Creek, Westfield Road along Rutledge Creek and Reeves Mill Road along Seed Cane Creek.  No damage to the roads themselves were reported, however some debris removal was necessary to make the roads passable again.

Flash Flood in SURRY, NORTH CAROLINA
From 22-SEP-21 17:00:00 to 22-SEP-21 19:00:00 (EST-5)
Location: MT AIRY SURRY CO ARP
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Heavy rain of up to 2.25 inches in 2 hours caused Stoney Creek to rise rapidly for the 2nd time in 24 hours.  Flooding from Stoney Creek forced residents of a home on Christy Lane to evacuate.  Hiatt Road was also impassible due to flood waters from Stoney Creek passing across the road.  The road reopened after flooding receded.  No damage or injuries were reported.

Heavy Rain in SURRY, NORTH CAROLINA
From 21-SEP-21 07:00:00 to 22-SEP-21 07:00:00 (EST-5)
Location: FLAT ROCK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

An automated weather station (Weather Underground: KNCMOUNT12) observed a 24-hour rainfall total, ending 8 AM EDT, of 7.83 inches, which is between a 50- and 100-year rainfall event per NOAA Atlas 14 point frequency estimates for this duration.  This event includes about five inches of rain which fell between 9 PM and midnight on the 21st, which is between a 200- and 500-year event per NOAA Atlas 14.

Flash Flood in SURRY, NORTH CAROLINA
From 21-SEP-21 22:30:00 to 22-SEP-21 03:00:00 (EST-5)
Location: BANNERTOWN
Flood cause: Heavy Rain
Property damage: 6.00K
Crop damage: 0.00K
Reported by: Public

Seed Cane Creek flooded out of its banks across Reeves Mill Road, making the road impassible.  Two separate swift water rescues took place when two automobiles were caught in the flooding and the occupants were rescued.  No injuries were reported.  Some water damage occurred to each vehicle.