Alert archive / North Carolina / Flash Flood Warnings
Flash Flood Warnings in North Carolina, 2015
98 flash flood warnings in 2015. 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 2015. Tap one for its archive.
- Flash Flood Warnings
- 98
- Busiest month
- December30 flash flood warnings
- Busiest day
- December 30, 201514 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.
64 of 98 flash flood warnings covering North Carolina in 2015 had a flash flood report inside them; 146 of 176 flash flood reports fell inside a warning, on average 108 minutes after it went out.
North Carolina, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 98 | 64 | 35% | 176 | 83% | 108 min |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Greenville-Spartanburg, SC: flash flood warnings | 63 | 43 | 32% | 144 | 76% | 131 min |
| NWS Raleigh, NC: flash flood warnings | 35 | 24 | 31% | 49 | 88% | 73 min |
| NWS Wilmington, NC: flash flood warnings | 15 | 12 | 20% | 74 | 97% | 175 min |
| NWS Wakefield, VA: flash flood warnings | 3 | 3 | 0% | 7 | 100% | 44 min |
| NWS Morristown, TN: flash flood warnings | 18 | 8 | 56% | 14 | 71% | 45 min |
| NWS Blacksburg, VA: flash flood warnings | 30 | 18 | 40% | 55 | 84% | 80 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 |
|---|---|---|---|---|
| Apr 9, 7:03 PM EDT | Flash Flood Warning | RAH | Chatham, Wake | 3 hr |
| Apr 9, 7:35 PM EDT | Flash Flood Warning | RAH | Wake | 3 hr |
| Apr 9, 7:42 PM EDT | Flash Flood Warning | RNK | Watauga | 6 hr |
| Apr 19, 3:28 PM EDT | Flash Flood Warning | GSP | Avery | 4 hr |
| Apr 19, 6:24 PM EDT | Flash Flood Warning | GSP | Gaston, Mecklenburg | 4 hr |
| Apr 19, 6:25 PM EDT | Flash Flood Warning | RNK | Ashe, Watauga | 6 hr |
| Apr 19, 6:47 PM EDT | Flash Flood Warning | RNK | Alleghany, Surry, Wilkes | 6 hr |
| Apr 19, 7:23 PM EDT | Flash Flood Warning | RAH | Davidson, Forsyth, Guilford | 3 hr |
| Apr 19, 7:32 PM EDT | Flash Flood Warning | GSP | Cabarrus, Mecklenburg | 3 hr |
| Apr 20, 4:22 PM EDT | Flash Flood Warning | GSP | Mecklenburg | 3 hr |
| May 11, 4:47 PM EDT | Flash Flood Warning | RNK | Watauga | 3 hr |
| May 11, 4:58 PM EDT | Flash Flood Warning | GSP | Avery | 4 hr |
| May 11, 6:00 PM EDT | Flash Flood Warning | RNK | Ashe | 3 hr |
| May 27, 9:14 PM EDT | Flash Flood Warning | GSP | Haywood | 2 hr |
| May 31, 3:47 PM EDT | Flash Flood Warning | MRX | Cherokee | 3 hr |
| Jun 2, 5:29 PM EDT | Flash Flood Warning | GSP | Alexander | 3 hr |
| Jun 8, 7:22 PM EDT | Flash Flood Warning | GSP | Henderson, Polk, Transylvania | 3 hr |
| Jun 9, 8:00 PM EDT | Flash Flood Warning | RAH | Cumberland, Sampson | 3 hr |
| Jun 9, 8:58 PM EDT | Flash Flood Warning | RAH | Anson, Richmond | 3 hr |
| Jun 9, 10:06 PM EDT | Flash Flood Warning | RAH | Scotland | 3 hr |
| Jun 10, 11:31 PM EDT | Flash Flood Warning | GSP | Burke | 3 hr |
| Jun 18, 9:16 PM EDT | Flash Flood Warning | RAH | Edgecombe, Nash | 3 hr |
| Jun 18, 9:27 PM EDT | Flash Flood Warning | RAH | Durham, Wake | 2 hr |
| Jun 18, 9:54 PM EDT | Flash Flood Warning | RAH | Wake | 96 min |
| Jun 19, 6:37 PM EDT | Flash Flood Warning | RAH | Guilford | 3 hr |
| Jun 25, 4:31 AM EDT | Flash Flood Warning | RAH | Chatham, Randolph | 3 hr |
| Jun 25, 6:09 PM EDT | Flash Flood Warning | RAH | Orange | 3 hr |
| Jun 26, 10:17 PM EDT | Flash Flood Warning | RAH | Richmond, Scotland | 3 hr |
| Jun 27, 3:06 AM EDT | Flash Flood Warning | RAH | Cumberland, Hoke, Moore | 3 hr |
| Jun 27, 7:01 PM EDT | Flash Flood Warning | RAH | Guilford | 3 hr |
| Jul 13, 9:25 AM EDT | Flash Flood Warning | GSP | Madison | 3 hr |
| Jul 13, 10:11 AM EDT | Flash Flood Warning | GSP | Buncombe | 3 hr |
| Jul 23, 6:41 PM EDT | Flash Flood Warning | GSP | Cabarrus, Union | 3 hr |
| Jul 27, 11:56 PM EDT | Flash Flood Warning | GSP | Union | 3 hr |
| Aug 5, 6:30 PM EDT | Flash Flood Warning | RNK | Watauga | 4 hr |
| Aug 6, 6:15 PM EDT | Flash Flood Warning | RAH | Sampson | 3 hr |
| Aug 6, 8:54 PM EDT | Flash Flood Warning | RAH | Davidson, Forsyth, Guilford, Randolph | 3 hr |
| Aug 11, 4:29 PM EDT | Flash Flood Warning | GSP | Mecklenburg, Union | 3 hr |
| Aug 18, 8:41 PM EDT | Flash Flood Warning | GSP | Union | 3 hr |
| Aug 18, 9:17 PM EDT | Flash Flood Warning | GSP | Union | 2 hr |
| Aug 19, 4:51 PM EDT | Flash Flood Warning | GSP | Cabarrus, Rowan | 4 hr |
| Aug 19, 6:08 PM EDT | Flash Flood Warning | GSP | Mecklenburg, Union | 3 hr |
| Aug 19, 6:49 PM EDT | Flash Flood Warning | GSP | Mecklenburg | 3 hr |
| Aug 19, 8:41 PM EDT | Flash Flood Warning | RAH | Cumberland, Harnett, Hoke, Moore | 3 hr |
| Aug 22, 7:40 PM EDT | Flash Flood Warning | GSP | Buncombe | 3 hr |
| Sep 29, 12:34 PM EDT | Flash Flood Warning | GSP | Buncombe, Madison, Yancey | 3 hr |
| Sep 30, 5:53 PM EDT | Flash Flood Warning | RNK | Watauga, Wilkes | 6 hr |
| Sep 30, 9:21 PM EDT | Flash Flood Warning | RAH | Montgomery, Stanly | 2 hr |
| Sep 30, 11:33 PM EDT | Flash Flood Warning | RAH | Montgomery, Stanly | 3 hr |
| Oct 2, 10:35 PM EDT | Flash Flood Warning | RAH | Anson, Montgomery, Moore, Richmond, Stanly | 5 hr |
| Oct 3, 12:36 AM EDT | Flash Flood Warning | RAH | Davidson, Forsyth, Guilford, Randolph | 5 hr |
| Oct 3, 1:12 AM EDT | Flash Flood Warning | GSP | Davie, Rowan | 6 hr |
| Oct 3, 1:22 AM EDT | Flash Flood Warning | GSP | Union | 6 hr |
| Oct 3, 1:27 AM EDT | Flash Flood Warning | GSP | Cabarrus | 6 hr |
| Oct 3, 1:38 AM EDT | Flash Flood Warning | GSP | Mecklenburg | 6 hr |
| Oct 3, 3:44 AM EDT | Flash Flood Warning | RAH | Anson, Stanly | 5 hr |
| Oct 3, 5:58 AM EDT | Flash Flood Warning | RNK | Stokes | 6 hr |
| Oct 3, 9:36 AM EDT | Flash Flood Warning | GSP | Mecklenburg | 3 hr |
| Oct 3, 10:56 AM EDT | Flash Flood Warning | GSP | Henderson | 6 hr |
| Oct 3, 11:47 AM EDT | Flash Flood Warning | GSP | McDowell | 3 hr |
| Oct 4, 1:12 PM EDT | Flash Flood Warning | ILM | Brunswick, Columbus, New Hanover | 6 hr |
| Oct 4, 6:00 PM EDT | Flash Flood Warning | ILM | Bladen, Brunswick, Columbus, New Hanover, Pender, Robeson | 6 hr |
| Oct 4, 11:58 PM EDT | Flash Flood Warning | ILM | Brunswick | 6 hr |
| Oct 5, 2:11 AM EDT | Flash Flood Warning | ILM | Brunswick, Columbus, New Hanover | 4 hr |
| Oct 5, 5:56 AM EDT | Flash Flood Warning | ILM | Brunswick, Columbus, New Hanover | 6 hr |
| Oct 5, 7:16 AM EDT | Flash Flood Warning | ILM | Bladen, Brunswick, Columbus, Pender | 3 hr |
| Nov 18, 11:33 PM EST | Flash Flood Warning | RNK | Ashe, Watauga | 6 hr |
| Nov 19, 8:53 AM EST | Flash Flood Warning | RAH | Cumberland | 82 min |
| Dec 22, 7:11 AM EST | Flash Flood Warning | GSP | Mecklenburg | 4 hr |
| Dec 22, 7:19 AM EST | Flash Flood Warning | GSP | Mecklenburg | 4 hr |
| Dec 23, 4:13 PM EST | Flash Flood Warning | RAH | Anson, Montgomery, Moore, Richmond, Stanly | 3 hr |
| Dec 23, 5:03 PM EST | Flash Flood Warning | RAH | Durham, Orange, Wake | 3 hr |
| Dec 24, 7:47 AM EST | Flash Flood Warning | RNK | Ashe | 6 hr |
| Dec 24, 8:07 AM EST | Flash Flood Warning | GSP | McDowell | 3 hr |
| Dec 24, 8:25 AM EST | Flash Flood Warning | GSP | Avery, Burke, Caldwell | 3 hr |
| Dec 24, 8:44 AM EST | Flash Flood Warning | GSP | Haywood, Jackson, Macon | 3 hr |
| Dec 24, 9:33 AM EST | Flash Flood Warning | GSP | Buncombe, McDowell | 3 hr |
| Dec 24, 10:18 AM EST | Flash Flood Warning | GSP | Burke, Caldwell | 3 hr |
| Dec 24, 11:02 AM EST | Flash Flood Warning | GSP | Transylvania | 3 hr |
| Dec 24, 12:25 PM EST | Flash Flood Warning | GSP | McDowell | 3 hr |
| Dec 28, 9:12 PM EST | Flash Flood Warning | GSP | Jackson, Macon | 3 hr |
| Dec 29, 12:12 AM EST | Flash Flood Warning | GSP | Polk | 3 hr |
| Dec 29, 12:17 AM EST | Flash Flood Warning | GSP | Transylvania | 4 hr |
| Dec 29, 2:16 AM EST | Flash Flood Warning | GSP | Buncombe | 3 hr |
| Dec 30, 9:42 AM EST | Flash Flood Warning | GSP | Cleveland, Gaston | 6 hr |
| Dec 30, 10:07 AM EST | Flash Flood Warning | GSP | Cabarrus, Mecklenburg | 6 hr |
| Dec 30, 11:13 AM EST | Flash Flood Warning | RAH | Davidson, Randolph | 4 hr |
| Dec 30, 11:18 AM EST | Flash Flood Warning | GSP | Mecklenburg | 6 hr |
| Dec 30, 11:33 AM EST | Flash Flood Warning | RAH | Alamance, Chatham, Orange | 4 hr |
| Dec 30, 11:38 AM EST | Flash Flood Warning | GSP | Cabarrus, Union | 6 hr |
| Dec 30, 11:54 AM EST | Flash Flood Warning | RAH | Durham, Franklin, Granville, Vance, Wake | 6 hr |
| Dec 30, 12:31 PM EST | Flash Flood Warning | GSP | Catawba, Davie, Iredell, Lincoln, Rowan | 6 hr |
| Dec 30, 1:34 PM EST | Flash Flood Warning | RAH | Davidson, Forsyth, Guilford, Randolph | 5 hr |
| Dec 30, 1:48 PM EST | Flash Flood Warning | RAH | Anson, Montgomery, Moore, Randolph, Richmond, Stanly | 5 hr |
| Dec 30, 2:09 PM EST | Flash Flood Warning | RAH | Chatham, Lee, Moore | 5 hr |
| Dec 30, 3:17 PM EST | Flash Flood Warning | RAH | Davidson, Randolph | 3 hr |
| Dec 30, 3:28 PM EST | Flash Flood Warning | RAH | Alamance, Chatham, Orange | 3 hr |
| Dec 30, 3:35 PM EST | Flash Flood Warning | RAH | Johnston, Wake | 3 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Mecklenburg County12
- Union County8
- Wake County7
- Randolph County7
- Watauga County6
- Davidson County6
- Guilford County6
- Cabarrus County6
- Moore County6
- Stanly County6
- Brunswick County6
- Chatham County5
- Anson County5
- Richmond County5
- Buncombe County5
- Montgomery County5
- Columbus County5
- Ashe County4
- Forsyth County4
- Cumberland County4
- Orange County4
- McDowell County4
- New Hanover County4
- Avery County3
- Transylvania County3
- Burke County3
- Durham County3
- Rowan County3
- Gaston County2
- Wilkes County2
- Haywood County2
- Henderson County2
- Polk County2
- Sampson County2
- Scotland County2
- Hoke County2
- Madison County2
- Davie County2
- Bladen County2
- Pender County2
23 more counties
- Caldwell County2
- Jackson County2
- Macon County2
- Alamance County2
- Alleghany County1
- Surry County1
- Cherokee County1
- Alexander County1
- Edgecombe County1
- Nash County1
- Harnett County1
- Yancey County1
- Stokes County1
- Robeson County1
- Cleveland County1
- Franklin County1
- Granville County1
- Vance County1
- Catawba County1
- Iredell County1
- Lincoln County1
- Lee County1
- Johnston County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20142016
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.