The remains of Hurricane Michael were preceded in parts of western Virginia by a so-called Predecessor Event (PRE) which brought moderate to heavy rainfall across several counties early on the 11th of October. A deep moisture plume surged north on the periphery of the subtropical ridge over the southeast with the very high precipitable water producing high rainfall rates. The heaviest rainfall from the PRE was concentrated in upper and middle portions of the New River basin and the far upper Dan basin where the amountsl ranged from 2 to 6 inches with isolated higher amounts in the 24 hours ending at 700 AM local time.

Heavy Rain in GALAX (C), VIRGINIA
From 10-OCT-18 06:00:00 to 11-OCT-18 06:00:00 (EST-5)
Location: GALAX
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP site at Galax Water Plant (GAAV2) measured 4.50 inches in 24-hours ending at 700 AM local time on the 11th. This was the highest 24-hour rainfall during the month of October and 4th highest for any day, with complete records dating back to 2000 and a brief period from 1907-1910. This value falls into the 90 percent confidence interval (4.00-4.81 inches) for a 10-year recurrence interval event (.10 annual exceedance probability) per NOAA Atlas 2.

Heavy Rain in GRAYSON, VIRGINIA
From 10-OCT-18 06:00:00 to 11-OCT-18 06:00:00 (EST-5)
Location: REAVISTOWN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

The automated rain gage located at the USGS Galax River gage site (GAXV2) measured 5.03 inches in 24-hours ending 700 AM local time on the 11th. This value falls into the 90 percent confidence interval (4.74-5.73 inches) for a 25-year recurrence interval event (.04 annual exceedance probability) per NOAA Atlas 2.

Flood in GALAX (C), VIRGINIA
From 10-OCT-18 17:20:00 to 10-OCT-18 22:15:00 (EST-5)
Location: GALAX
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The stream gage on Chestnut Creek at Galax (CCKV2) crested at 9.77 feet (4860 cfs) in the evening hours of the 10th. Minor flood stage is 7 feet. Several roads were closed, including Chestnut Drive at this stage. This was the highest stage since Novenber, 2003 (11.91 ft.) at this gage and was between a 10- and 25-year flood event (0.10-0.04 annual chance flood) per USGS information.

Flash Flood in GALAX (C), VIRGINIA
From 10-OCT-18 16:40:00 to 10-OCT-18 19:40:00 (EST-5)
Location: GALAX
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Mill Creek flooded and several people were evacuated from a mobile home park off of Glade Street. Social media had several reports of flooded roads in Galax including the intersection of Swanson Street and McArthur Street and Glendale Road and Hebron Road.

Flash Flood in GRAYSON, VIRGINIA
From 10-OCT-18 17:00:00 to 10-OCT-18 20:00:00 (EST-5)
Location: REAVISTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Social media reported Delhart Road (Route 622) flooded in eastern Grayson County.

Flash Flood in WYTHE, VIRGINIA
From 10-OCT-18 17:30:00 to 10-OCT-18 18:45:00 (EST-5)
Location: IVANHOE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Wythe County 911 dispatch reported numerous road closed due to flooding
in eastern Wythe county, mainly in the Max Meadows and Fort Chiswell
areas. Locust Hill Road, Felts lane, Danner Road and Archer Road were
flooding. Ivanhoe Road was also closed.

Flash Flood in CARROLL, VIRGINIA
From 10-OCT-18 16:30:00 to 10-OCT-18 20:00:00 (EST-5)
Location: GALAX CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flash flooding was reported on social media along Old Quaker Road near Pipers Gap where Wards Mill Branch crosses the road.  A home was surrounded by rapidly moving water in the photos.

Flash Flood in FLOYD, VIRGINIA
From 11-OCT-18 09:13:00 to 11-OCT-18 13:13:00 (EST-5)
Location: FLOYD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Seven roads were reported closed across Floyd County due to high water with the first reports at of 1013 AM local time.