Alert archive / North Carolina / Flash Flood Warnings
Flash Flood Warnings in North Carolina, 2009
119 flash flood warnings in 2009. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of flash flood warnings reaches back to 1986.
Flash Flood Warnings by county
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Flash Flood Warnings
- 119
- Busiest month
- June36 flash flood warnings
- Busiest day
- June 5, 20096 flash flood warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
68 of 119 flash flood warnings covering North Carolina in 2009 had a flash flood report inside them; 131 of 164 flash flood reports fell inside a warning, on average 95 minutes after it went out.
North Carolina, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 119 | 68 | 43% | 164 | 80% | 95 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Blacksburg, VA: flash flood warnings | 108 | 53 | 51% | 135 | 81% | 100 min |
| NWS Greenville-Spartanburg, SC: flash flood warnings | 55 | 40 | 27% | 103 | 73% | 94 min |
| NWS Wakefield, VA: flash flood warnings | 19 | 14 | 26% | 21 | 81% | 40 min |
| NWS Morristown, TN: flash flood warnings | 39 | 29 | 26% | 59 | 76% | 75 min |
| NWS Newport/Morehead City, NC: flash flood warnings | 0 | 1 | 0% | |||
| NWS Raleigh, NC: flash flood warnings | 41 | 20 | 51% | 56 | 84% | 66 min |
| NWS Wilmington, NC: flash flood warnings | 2 | 2 | 0% | 6 | 100% | 65 min |
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.
The alerts
Every alert, in the order issued. Times are local, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 6, 6:20 PM EST | Flash Flood Warning | GSP | Graham, Swain | 4 hr |
| Jan 6, 6:58 PM EST | Flash Flood Warning | GSP | Macon | 4 hr |
| Jan 7, 12:30 AM EST | Flash Flood Warning | GSP | Graham, Macon, Swain | 4 hr |
| Jan 7, 2:33 AM EST | Flash Flood Warning | GSP | Haywood, Jackson, Transylvania | 4 hr |
| Jan 7, 3:40 AM EST | Flash Flood Warning | GSP | Henderson, Rutherford | 3 hr |
| Apr 24, 6:25 PM EDT | Flash Flood Warning | RAH | Harnett | 110 min |
| Apr 29, 9:34 PM EDT | Flash Flood Warning | RNK | Surry | 5 hr |
| May 5, 5:32 PM EDT | Flash Flood Warning | GSP | Cabarrus, Gaston, Mecklenburg, Union | 88 min |
| May 5, 6:54 PM EDT | Flash Flood Warning | RAH | Wake | 111 min |
| May 14, 9:49 PM EDT | Flash Flood Warning | GSP | Madison | 3 hr |
| May 14, 10:47 PM EDT | Flash Flood Warning | GSP | Madison | 3 hr |
| May 14, 11:31 PM EDT | Flash Flood Warning | GSP | Buncombe, Henderson | 3 hr |
| May 16, 6:01 PM EDT | Flash Flood Warning | RNK | Wilkes | 10 hr |
| May 16, 7:19 PM EDT | Flash Flood Warning | GSP | Avery, Caldwell | 6 hr |
| May 16, 10:13 PM EDT | Flash Flood Warning | RNK | Watauga | 6 hr |
| May 16, 11:04 PM EDT | Flash Flood Warning | GSP | Burke, Caldwell | 3 hr |
| May 26, 3:07 AM EDT | Flash Flood Warning | RNK | Wilkes | 10 hr |
| May 26, 3:49 AM EDT | Flash Flood Warning | GSP | Burke | 3 hr |
| May 26, 8:23 AM EDT | Flash Flood Warning | GSP | Alexander, Iredell | 3 hr |
| May 26, 3:09 PM EDT | Flash Flood Warning | GSP | Iredell | 3 hr |
| May 27, 4:53 AM EDT | Flash Flood Warning | RNK | Wilkes | 6 hr |
| May 28, 2:39 PM EDT | Flash Flood Warning | RNK | Wilkes | 3 hr |
| May 28, 2:42 PM EDT | Flash Flood Warning | GSP | Avery, Caldwell | 3 hr |
| Jun 2, 4:05 PM EDT | Flash Flood Warning | RNK | Alleghany | 6 hr |
| Jun 2, 4:51 PM EDT | Flash Flood Warning | RNK | Ashe | 6 hr |
| Jun 2, 5:44 PM EDT | Flash Flood Warning | RNK | Ashe | 5 hr |
| Jun 2, 7:17 PM EDT | Flash Flood Warning | RNK | Alleghany, Ashe | 5 hr |
| Jun 3, 1:08 PM EDT | Flash Flood Warning | RNK | Alleghany, Wilkes | 3 hr |
| Jun 3, 3:46 PM EDT | Flash Flood Warning | RNK | Wilkes | 6 hr |
| Jun 3, 5:16 PM EDT | Flash Flood Warning | RNK | Caswell | 5 hr |
| Jun 3, 5:45 PM EDT | Flash Flood Warning | RAH | Guilford | 2 hr |
| Jun 3, 7:36 PM EDT | Flash Flood Warning | RAH | Alamance, Guilford | 3 hr |
| Jun 3, 10:11 PM EDT | Flash Flood Warning | GSP | Alexander, Burke, Caldwell, McDowell | 6 hr |
| Jun 4, 5:06 PM EDT | Flash Flood Warning | RNK | Caswell | 6 hr |
| Jun 4, 8:09 PM EDT | Flash Flood Warning | GSP | Cabarrus, Gaston, Mecklenburg | 3 hr |
| Jun 5, 9:04 AM EDT | Flash Flood Warning | GSP | Mecklenburg | 3 hr |
| Jun 5, 10:04 AM EDT | Flash Flood Warning | RAH | Forsyth | 3 hr |
| Jun 5, 10:28 AM EDT | Flash Flood Warning | RAH | Guilford | 3 hr |
| Jun 5, 11:13 AM EDT | Flash Flood Warning | RAH | Davidson | 115 min |
| Jun 5, 12:04 PM EDT | Flash Flood Warning | GSP | Cabarrus, Mecklenburg | 3 hr |
| Jun 8, 6:20 PM EDT | Flash Flood Warning | GSP | Henderson | 90 min |
| Jun 9, 4:59 PM EDT | Flash Flood Warning | RAH | Edgecombe, Halifax | 3 hr |
| Jun 9, 5:17 PM EDT | Flash Flood Warning | RNK | Wilkes | 6 hr |
| Jun 9, 5:42 PM EDT | Flash Flood Warning | RAH | Halifax | 3 hr |
| Jun 9, 7:13 PM EDT | Flash Flood Warning | RAH | Nash | 56 min |
| Jun 10, 6:02 PM EDT | Flash Flood Warning | GSP | Henderson | 2 hr |
| Jun 10, 6:23 PM EDT | Flash Flood Warning | GSP | McDowell | 3 hr |
| Jun 10, 8:31 PM EDT | Flash Flood Warning | GSP | Union | 3 hr |
| Jun 10, 8:46 PM EDT | Flash Flood Warning | RNK | Rockingham | 3 hr |
| Jun 16, 4:31 AM EDT | Flash Flood Warning | RNK | Surry | 6 hr |
| Jun 16, 6:08 AM EDT | Flash Flood Warning | RAH | Durham, Wake | 3 hr |
| Jun 16, 6:45 AM EDT | Flash Flood Warning | RAH | Edgecombe, Franklin, Johnston, Nash, Wilson | 3 hr |
| Jun 16, 8:50 AM EDT | Flash Flood Warning | RAH | Wake | 3 hr |
| Jun 16, 9:39 AM EDT | Flash Flood Warning | RAH | Edgecombe, Franklin, Johnston, Nash, Wilson | 111 min |
| Jun 16, 7:44 PM EDT | Flash Flood Warning | RNK | Ashe, Wilkes | 6 hr |
| Jun 17, 2:28 PM EDT | Flash Flood Warning | RNK | Alleghany, Ashe, Wilkes | 12 hr |
| Jun 18, 2:00 AM EDT | Flash Flood Warning | RAH | Randolph | 3 hr |
| Jun 18, 4:40 AM EDT | Flash Flood Warning | RAH | Chatham, Lee, Moore, Randolph | 3 hr |
| Jun 18, 3:35 PM EDT | Flash Flood Warning | RNK | Ashe, Watauga | 4 hr |
| Jul 6, 9:05 PM EDT | Flash Flood Warning | ILM | New Hanover | 115 min |
| Jul 9, 12:51 PM EDT | Flash Flood Warning | GSP | Cabarrus, Mecklenburg | 4 hr |
| Jul 12, 11:45 PM EDT | Flash Flood Warning | RAH | Davidson | 3 hr |
| Jul 20, 10:45 AM EDT | Flash Flood Warning | RNK | Stokes, Surry, Yadkin | 6 hr |
| Jul 20, 5:03 PM EDT | Flash Flood Warning | RAH | Stanly | 2 hr |
| Jul 20, 5:47 PM EDT | Flash Flood Warning | RAH | Montgomery | 115 min |
| Jul 20, 6:29 PM EDT | Flash Flood Warning | RNK | Watauga | 2 hr |
| Jul 20, 9:29 PM EDT | Flash Flood Warning | RAH | Anson | 83 min |
| Jul 20, 11:44 PM EDT | Flash Flood Warning | GSP | Union | 3 hr |
| Jul 22, 9:50 PM EDT | Flash Flood Warning | GSP | Cabarrus, Rowan | 3 hr |
| Jul 22, 10:33 PM EDT | Flash Flood Warning | GSP | Cabarrus, Mecklenburg | 2 hr |
| Jul 25, 8:33 PM EDT | Flash Flood Warning | RAH | Wayne, Wilson | 2 hr |
| Jul 25, 9:25 PM EDT | Flash Flood Warning | RAH | Johnston | 75 min |
| Jul 27, 6:24 PM EDT | Flash Flood Warning | AKQ | Hertford, Northampton | 3 hr |
| Jul 27, 9:51 PM EDT | Flash Flood Warning | RAH | Stanly | 3 hr |
| Jul 27, 10:09 PM EDT | Flash Flood Warning | GSP | Cabarrus | 3 hr |
| Jul 28, 7:37 PM EDT | Flash Flood Warning | GSP | Mecklenburg | 3 hr |
| Jul 31, 7:21 PM EDT | Flash Flood Warning | RAH | Warren | 98 min |
| Jul 31, 8:45 PM EDT | Flash Flood Warning | RAH | Davidson, Randolph | 2 hr |
| Aug 1, 6:19 PM EDT | Flash Flood Warning | RNK | Alleghany, Ashe | 2 hr |
| Aug 1, 6:58 PM EDT | Flash Flood Warning | RNK | Watauga | 3 hr |
| Aug 1, 10:07 PM EDT | Flash Flood Warning | RNK | Surry, Wilkes, Yadkin | 4 hr |
| Aug 5, 3:06 PM EDT | Flash Flood Warning | RNK | Ashe, Watauga | 6 hr |
| Aug 5, 4:06 PM EDT | Flash Flood Warning | RNK | Alleghany, Wilkes | 5 hr |
| Aug 5, 5:54 PM EDT | Flash Flood Warning | RAH | Granville, Vance | 115 min |
| Aug 5, 6:29 PM EDT | Flash Flood Warning | GSP | Gaston, Mecklenburg | 3 hr |
| Aug 5, 6:35 PM EDT | Flash Flood Warning | RAH | Halifax, Warren | 91 min |
| Aug 5, 7:48 PM EDT | Flash Flood Warning | AKQ | Northampton | 3 hr |
| Aug 11, 8:17 PM EDT | Flash Flood Warning | RAH | Cumberland, Harnett, Johnston, Sampson | 3 hr |
| Aug 14, 9:25 AM EDT | Flash Flood Warning | RAH | Cumberland | 3 hr |
| Aug 16, 1:08 PM EDT | Flash Flood Warning | GSP | Mecklenburg | 4 hr |
| Aug 17, 12:12 AM EDT | Flash Flood Warning | GSP | Cleveland, Rutherford | 3 hr |
| Aug 19, 8:06 PM EDT | Flash Flood Warning | RNK | Watauga, Wilkes | 4 hr |
| Aug 20, 5:34 PM EDT | Flash Flood Warning | RNK | Ashe | 6 hr |
| Aug 20, 8:11 PM EDT | Flash Flood Warning | RNK | Watauga | 6 hr |
| Aug 20, 8:20 PM EDT | Flash Flood Warning | RNK | Surry | 6 hr |
| Aug 22, 11:57 AM EDT | Flash Flood Warning | RAH | Granville, Person | 81 min |
| Sep 8, 7:12 PM EDT | Flash Flood Warning | RNK | Surry | 119 min |
| Sep 20, 12:40 AM EDT | Flash Flood Warning | GSP | Henderson, Polk | 3 hr |
| Sep 20, 3:30 AM EDT | Flash Flood Warning | GSP | Henderson, Polk, Rutherford | 3 hr |
| Sep 20, 4:30 AM EDT | Flash Flood Warning | GSP | Henderson, Jackson, Macon, Transylvania | 4 hr |
| Sep 22, 8:42 PM EDT | Flash Flood Warning | RAH | Harnett, Wake | 3 hr |
| Sep 22, 11:43 PM EDT | Flash Flood Warning | RAH | Harnett, Wake | 3 hr |
| Sep 25, 3:56 PM EDT | Flash Flood Warning | RAH | Richmond | 2 hr |
| Sep 25, 4:24 PM EDT | Flash Flood Warning | RAH | Anson | 97 min |
| Sep 25, 7:15 PM EDT | Flash Flood Warning | GSP | Cleveland, Rutherford | 2 hr |
| Nov 10, 5:59 PM EST | Flash Flood Warning | GSP | Graham, Swain | 10 hr |
| Nov 11, 1:21 AM EST | Flash Flood Warning | GSP | Henderson | 6 hr |
| Nov 11, 5:26 AM EST | Flash Flood Warning | GSP | Cabarrus, Mecklenburg | 6 hr |
| Nov 11, 7:41 AM EST | Flash Flood Warning | RAH | Guilford | 3 hr |
| Nov 12, 6:00 AM EST | Flash Flood Warning | RAH | Davidson, Forsyth, Guilford, Randolph | 3 hr |
| Nov 12, 9:04 AM EST | Flash Flood Warning | RAH | Davidson, Forsyth, Guilford, Randolph | 4 hr |
| Nov 12, 9:51 AM EST | Flash Flood Warning | RAH | Edgecombe, Franklin, Halifax, Nash, Warren | 4 hr |
| Nov 12, 1:51 PM EST | Flash Flood Warning | RAH | Halifax | 3 hr |
| Dec 2, 11:11 AM EST | Flash Flood Warning | GSP | Henderson | 3 hr |
| Dec 2, 4:36 PM EST | Flash Flood Warning | GSP | Burke | 3 hr |
| Dec 2, 9:50 PM EST | Flash Flood Warning | RAH | Chatham, Durham, Orange, Wake | 3 hr |
| Dec 2, 11:30 PM EST | Flash Flood Warning | RAH | Franklin, Warren | 3 hr |
| Dec 25, 6:33 AM EST | Flash Flood Warning | GSP | Henderson | 6 hr |
| Dec 25, 11:16 AM EST | Flash Flood Warning | GSP | Mecklenburg | 3 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Wilkes County12
- Mecklenburg County11
- Henderson County10
- Ashe County9
- Cabarrus County8
- Watauga County7
- Surry County6
- Wake County6
- Alleghany County6
- Guilford County6
- Davidson County5
- Halifax County5
- Randolph County5
- Rutherford County4
- Harnett County4
- Caldwell County4
- Burke County4
- Edgecombe County4
- Nash County4
- Franklin County4
- Johnston County4
- Warren County4
- Graham County3
- Swain County3
- Macon County3
- Gaston County3
- Union County3
- Forsyth County3
- Wilson County3
- Jackson County2
- Transylvania County2
- Madison County2
- Avery County2
- Alexander County2
- Iredell County2
- Caswell County2
- McDowell County2
- Durham County2
- Chatham County2
- Yadkin County2
24 more counties
- Stanly County2
- Anson County2
- Northampton County2
- Granville County2
- Cumberland County2
- Cleveland County2
- Polk County2
- Haywood County1
- Buncombe County1
- Alamance County1
- Rockingham County1
- Lee County1
- Moore County1
- New Hanover County1
- Stokes County1
- Montgomery County1
- Rowan County1
- Wayne County1
- Hertford County1
- Vance County1
- Sampson County1
- Person County1
- Richmond County1
- Orange County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20082010
Sources
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.