Flash Flood Warnings in North Carolina, 2017

By month

36 of 57 flash flood warnings covering North Carolina in 2017 had a flash flood report inside them; 92 of 122 flash flood reports fell inside a warning, on average 84 minutes after it went out.

North Carolina, 2017

Each office's whole area, 2017

An office's figures cover every county it serves, including across state lines.

Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.

• Wake County4
• Pitt County4
• Guilford County4
• Union County4
• Stanly County4
• Wilkes County3
• Jones County3
• Onslow County3
• Watauga County3
• Randolph County3
• McDowell County3
• Cabarrus County3
• Mecklenburg County3
• Lenoir County2
• Beaufort County2
• Martin County2
• Alleghany County2
• Ashe County2
• Forsyth County2
• Rutherford County2
• Mitchell County2
• Yancey County2
• Granville County2
• Davidson County2
• Rowan County2
• Columbus County2
• Richmond County2
• Montgomery County2
• Cumberland County2
• Burke County2
• Henderson County1
• New Hanover County1
• Pender County1
• Duplin County1
• Carteret County1
• Craven County1
• Pamlico County1
• Washington County1
• Surry County1
• Edgecombe County1

1. June 20, 20176flash flood warnings
2. October 23, 20175flash flood warnings
3. April 25, 20174flash flood warnings
4. September 1, 20174flash flood warnings
5. April 24, 20173flash flood warnings
6. May 24, 20173flash flood warnings
7. July 18, 20173flash flood warnings
8. August 14, 20173flash flood warnings
9. June 17, 20172flash flood warnings
10. July 15, 20172flash flood warnings
11. July 23, 20172flash flood warnings
12. March 31, 20171flash flood warnings

Alerts in force nowTornadoes on recordThe radar archive20162018

National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.