Flash Flood Warnings in North Carolina, 2008

By month

83 of 141 flash flood warnings covering North Carolina in 2008 had a flash flood report inside them; 133 of 149 flash flood reports fell inside a warning, on average 112 minutes after it went out.

North Carolina, 2008

Each office's whole area, 2008

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 County10
• Guilford County10
• Anson County10
• Moore County8
• Cumberland County8
• Cabarrus County7
• Harnett County7
• Durham County7
• Mecklenburg County7
• Orange County7
• Richmond County7
• Caswell County6
• Rockingham County6
• Lee County6
• Scotland County6
• Johnston County6
• Chatham County6
• Person County6
• Watauga County5
• Halifax County5
• Forsyth County5
• Wilkes County5
• Mitchell County5
• Alamance County5
• Nash County5
• Randolph County5
• Catawba County4
• Chowan County4
• Wayne County4
• Granville County4
• Franklin County4
• Edgecombe County3
• Gates County3
• Davidson County3
• Stokes County3
• Alleghany County3
• Ashe County3
• Stanly County3
• Iredell County3
• Vance County3

1. August 27, 200830flash flood warnings
2. September 6, 200810flash flood warnings
3. August 26, 20089flash flood warnings
4. August 28, 20089flash flood warnings
5. August 17, 20086flash flood warnings
6. June 22, 20085flash flood warnings
7. July 5, 20085flash flood warnings
8. May 9, 20084flash flood warnings
9. July 6, 20084flash flood warnings
10. July 9, 20084flash flood warnings
11. August 30, 20084flash flood warnings
12. June 12, 20083flash flood warnings

Alerts in force nowTornadoes on recordThe radar archive20072009

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.