Flash Flood in Cabarrus County, North Carolina

River gauges and emergency management reported flash flooding developed across portions of Cabarrus County after 3 to 6 inches of rain fell across the county over two days, with 1 to 2 inches of that falling in less than three hours on the morning of the 27th. The main impacts were to the Rocky River and especially its tributaries. The Rocky River inundated several roads throughout the western and southern part of the county, including Shiloh Church Rd and Mount Pleasant Rd. In addition, Wolf Meadow Branch inundated Stough Rd, Back Creek flooded Stallings Rd, Dutch Buffalo Creek overflowed onto Bowman-Barrier Rd, and Muddy Creek inundated Hopewell Church Rd in Midland.

Tropical Cyclone Helene began organizing over the western Caribbean on the 23rd and 24th of September before rapidly intensifying as it moved north through the eastern Gulf of Mexico on the 25th and 26th. A plume of moisture extending from the intensifying storm interacted with a slow-moving cold front to produce a band of widespread heavy rain showers and embedded scattered thunderstorms over the southern Appalachians and vicinity on the 25th and 26th, resulting in a predecessor heavy rainfall and flash flooding event over these areas. Helene made landfall in the Florida Big Bend and moved quickly N/NE through Georgia before turning toward the N/NW once the remnant center reached northeast Georgia. Tropical rainbands around the center of Helene swept over areas with already-saturated soils over the mountains and foothills during the early morning of the 27th, resulting in extreme rainfall and record, catastrophic flash flooding across multiple basins with headwaters near the Blue Ridge escarpment. Due to its quick movement, Helene was still a strong tropical storm when the wind field reached the western Carolinas and northeast Georgia. Frequent wind gusts of 55 to 70 mph, with occasional gusts of 80 mph...and likely as high as 100 mph across the higher elevations combined with saturated soils to produce widespread damage to trees and electrical infrastructure. Across the mountains, some east and southeast-facing slopes above 3000 feet saw canopy-loss of 80% or more. Hundreds of trees fell on houses, vehicles, and power lines throughout the area, resulting in several fatalities. Almost all customers in several counties lost power for at least a brief period. Most people were without power for at least a couple of days, while thousands were without power for a week or more.