Flash Flood Warnings in North Carolina, 2010

By month

109 of 173 flash flood warnings covering North Carolina in 2010 had a flash flood report inside them; 257 of 302 flash flood reports fell inside a warning, on average 113 minutes after it went out.

North Carolina, 2010

Each office's whole area, 2010

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.

• Guilford County16
• Mecklenburg County11
• Forsyth County11
• New Hanover County11
• Rockingham County10
• Brunswick County10
• Pender County10
• Wilkes County9
• Davidson County9
• Wake County9
• Watauga County8
• Stokes County8
• Ashe County7
• Cabarrus County7
• Randolph County7
• Halifax County7
• Alleghany County6
• Burke County6
• Montgomery County6
• Anson County6
• Richmond County6
• Durham County6
• Johnston County6
• Henderson County5
• Transylvania County5
• Caldwell County5
• Surry County5
• Stanly County5
• Edgecombe County5
• Bertie County5
• Hertford County5
• Cumberland County5
• Wayne County5
• Avery County4
• Yadkin County4
• Moore County4
• Orange County4
• Granville County4
• Caswell County4
• Jackson County4

1. September 30, 201022flash flood warnings
2. January 25, 201018flash flood warnings
3. September 29, 201010flash flood warnings
4. July 27, 20108flash flood warnings
5. August 20, 20107flash flood warnings
6. August 19, 20106flash flood warnings
7. May 28, 20105flash flood warnings
8. June 2, 20105flash flood warnings
9. March 29, 20104flash flood warnings
10. May 29, 20104flash flood warnings
11. June 1, 20104flash flood warnings
12. August 5, 20104flash flood warnings

Alerts in force nowTornadoes on recordThe radar archive20092011

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.