Alert archive / South Carolina / Flash Flood Warnings
Flash Flood Warnings in South Carolina, 2015
91 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
- 91
- Busiest month
- October43 flash flood warnings
- Busiest day
- October 4, 201515 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.
74 of 91 flash flood warnings covering South Carolina in 2015 had a flash flood report inside them; 370 of 399 flash flood reports fell inside a warning, on average 297 minutes after it went out.
South Carolina, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 91 | 74 | 19% | 399 | 93% | 297 min |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Columbia, SC: flash flood warnings | 39 | 30 | 23% | 110 | 94% | 77 min |
| NWS Greenville-Spartanburg, SC: flash flood warnings | 63 | 43 | 32% | 144 | 76% | 131 min |
| NWS Charleston, SC: flash flood warnings | 21 | 17 | 19% | 192 | 96% | 473 min |
| NWS Wilmington, NC: flash flood warnings | 15 | 12 | 20% | 74 | 97% | 175 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 19, 6:24 PM EDT | Flash Flood Warning | GSP | York | 4 hr |
| Apr 20, 3:21 PM EDT | Flash Flood Warning | GSP | Greenville, Oconee, Pickens | 39 min |
| Apr 20, 3:43 PM EDT | Flash Flood Warning | GSP | Cherokee, Greenville, Spartanburg | 62 min |
| May 20, 3:27 PM EDT | Flash Flood Warning | CHS | Berkeley, Charleston | 2 hr |
| May 28, 6:34 PM EDT | Flash Flood Warning | GSP | Spartanburg | 116 min |
| Jun 2, 10:05 PM EDT | Flash Flood Warning | CAE | Richland | 55 min |
| Jun 3, 10:55 PM EDT | Flash Flood Warning | GSP | Greenwood | 3 hr |
| Jun 3, 11:42 PM EDT | Flash Flood Warning | CAE | Newberry, Saluda | 3 hr |
| Jun 4, 12:23 AM EDT | Flash Flood Warning | CAE | Lexington, Richland | 2 hr |
| Jun 4, 12:34 AM EDT | Flash Flood Warning | CAE | Aiken, Edgefield, Lexington, McCormick, Saluda | 116 min |
| Jun 4, 2:22 AM EDT | Flash Flood Warning | CAE | Aiken, Calhoun, Kershaw, Lexington, Orangeburg, Richland and 1 more | 3 hr |
| Jun 8, 7:22 PM EDT | Flash Flood Warning | GSP | Greenville | 3 hr |
| Jun 9, 4:25 PM EDT | Flash Flood Warning | CHS | Berkeley, Charleston, Dorchester | 3 hr |
| Jun 9, 5:44 PM EDT | Flash Flood Warning | CHS | Charleston | 2 hr |
| Jun 22, 5:54 PM EDT | Flash Flood Warning | CHS | Berkeley, Charleston, Dorchester | 2 hr |
| Jun 25, 12:48 AM EDT | Flash Flood Warning | CHS | Berkeley, Charleston, Dorchester | 117 min |
| Jul 5, 7:47 PM EDT | Flash Flood Warning | CAE | Fairfield, Lexington, Richland | 118 min |
| Aug 5, 5:19 PM EDT | Flash Flood Warning | CAE | Richland | 116 min |
| Aug 6, 5:32 PM EDT | Flash Flood Warning | CAE | Lexington, Richland | 118 min |
| Aug 6, 7:29 PM EDT | Flash Flood Warning | CAE | Lexington, Richland | 2 hr |
| Aug 18, 3:12 PM EDT | Flash Flood Warning | CHS | Berkeley, Charleston | 4 hr |
| Aug 19, 4:24 PM EDT | Flash Flood Warning | CHS | Berkeley, Charleston | 111 min |
| Aug 30, 9:00 PM EDT | Flash Flood Warning | CAE | Lexington, Newberry, Richland, Saluda | 3 hr |
| Aug 30, 10:45 PM EDT | Flash Flood Warning | CAE | Lexington, Richland | 2 hr |
| Aug 31, 4:47 AM EDT | Flash Flood Warning | CHS | Beaufort, Jasper | 3 hr |
| Aug 31, 5:56 AM EDT | Flash Flood Warning | CHS | Berkeley, Charleston, Dorchester | 3 hr |
| Aug 31, 8:59 AM EDT | Flash Flood Warning | CHS | Berkeley, Charleston | 61 min |
| Sep 5, 1:21 AM EDT | Flash Flood Warning | CAE | Lexington, Richland | 114 min |
| Sep 21, 8:58 PM EDT | Flash Flood Warning | CAE | Richland | 2 hr |
| Sep 24, 1:14 PM EDT | Flash Flood Warning | CAE | Richland | 91 min |
| Sep 25, 1:30 AM EDT | Flash Flood Warning | GSP | Greenwood | 3 hr |
| Sep 25, 4:56 PM EDT | Flash Flood Warning | CAE | Clarendon, Lee, Sumter | 3 hr |
| Sep 25, 11:56 PM EDT | Flash Flood Warning | CAE | Richland | 109 min |
| Sep 30, 8:43 PM EDT | Flash Flood Warning | CAE | Lee, Sumter | 3 hr |
| Oct 1, 2:01 AM EDT | Flash Flood Warning | GSP | Spartanburg | 3 hr |
| Oct 1, 1:39 PM EDT | Flash Flood Warning | CHS | Charleston | 6 hr |
| Oct 1, 6:08 PM EDT | Flash Flood Warning | GSP | Pickens | 3 hr |
| Oct 2, 11:22 PM EDT | Flash Flood Warning | CHS | Berkeley, Charleston | 18 hr |
| Oct 3, 2:36 AM EDT | Flash Flood Warning | CAE | Chesterfield | 6 hr |
| Oct 3, 3:34 AM EDT | Flash Flood Warning | CHS | Berkeley, Charleston, Colleton, Dorchester | 21 hr |
| Oct 3, 9:14 AM EDT | Flash Flood Warning | CAE | Calhoun, Clarendon, Orangeburg | 4 hr |
| Oct 3, 3:00 PM EDT | Flash Flood Warning | CAE | Clarendon, Sumter | 2 hr |
| Oct 3, 4:09 PM EDT | Flash Flood Warning | ILM | Florence, Georgetown, Horry, Marion, Williamsburg | 4 hr |
| Oct 3, 5:09 PM EDT | Flash Flood Warning | ILM | Darlington, Dillon, Florence, Marlboro | 3 hr |
| Oct 3, 5:15 PM EDT | Flash Flood Warning | CHS | Berkeley, Charleston | 3 hr |
| Oct 3, 8:00 PM EDT | Flash Flood Warning | CHS | Allendale, Beaufort, Colleton, Dorchester, Hampton | 6 hr |
| Oct 3, 8:16 PM EDT | Flash Flood Warning | CHS | Berkeley, Charleston | 25 hr |
| Oct 3, 10:55 PM EDT | Flash Flood Warning | CAE | Calhoun, Clarendon, Orangeburg, Richland, Sumter | 3 hr |
| Oct 4, 12:05 AM EDT | Flash Flood Warning | CHS | Berkeley, Charleston, Colleton, Dorchester | 6 hr |
| Oct 4, 12:41 AM EDT | Flash Flood Warning | GSP | Abbeville, Greenwood, Laurens | 3 hr |
| Oct 4, 1:06 AM EDT | Flash Flood Warning | CAE | Calhoun, Lexington, Orangeburg, Richland | 3 hr |
| Oct 4, 1:40 AM EDT | Flash Flood Warning | CAE | Calhoun, Clarendon, Orangeburg, Richland, Sumter | 3 hr |
| Oct 4, 2:12 AM EDT | Flash Flood Warning | ILM | Georgetown, Williamsburg | 16 hr |
| Oct 4, 3:48 AM EDT | Flash Flood Warning | CAE | Aiken, Calhoun, Clarendon, Edgefield, Fairfield, Kershaw and 6 more | 6 hr |
| Oct 4, 5:42 AM EDT | Flash Flood Warning | CHS | Berkeley, Charleston, Colleton, Dorchester | 16 hr |
| Oct 4, 7:47 AM EDT | Flash Flood Warning | CAE | Aiken, Bamberg, Barnwell, Calhoun, Clarendon, Edgefield and 11 more | 6 hr |
| Oct 4, 9:39 AM EDT | Flash Flood Warning | ILM | Florence, Horry, Marion | 9 hr |
| Oct 4, 1:12 PM EDT | Flash Flood Warning | ILM | Horry | 6 hr |
| Oct 4, 6:00 PM EDT | Flash Flood Warning | ILM | Darlington, Dillon, Florence, Horry, Marion, Marlboro | 6 hr |
| Oct 4, 6:14 PM EDT | Flash Flood Warning | ILM | Florence, Georgetown, Horry, Marion, Williamsburg | 6 hr |
| Oct 4, 9:44 PM EDT | Flash Flood Warning | CHS | Berkeley, Charleston, Dorchester | 17 hr |
| Oct 4, 11:58 PM EDT | Flash Flood Warning | ILM | Florence, Georgetown, Horry, Marion, Williamsburg | 6 hr |
| Oct 5, 2:11 AM EDT | Flash Flood Warning | ILM | Horry | 4 hr |
| Oct 5, 5:56 AM EDT | Flash Flood Warning | ILM | Florence, Georgetown, Horry, Marion, Williamsburg | 6 hr |
| Oct 5, 7:19 AM EDT | Flash Flood Warning | ILM | Florence, Horry, Marion | 3 hr |
| Oct 5, 3:34 PM EDT | Flash Flood Warning | CAE | Richland | 3 hr |
| Oct 6, 9:02 AM EDT | Flash Flood Warning | CAE | Richland | 6 hr |
| Oct 7, 6:48 AM EDT | Flash Flood Warning | CAE | Richland | 6 hr |
| Oct 10, 8:20 AM EDT | Flash Flood Warning | CAE | Richland | 85 min |
| Oct 10, 1:16 PM EDT | Flash Flood Warning | ILM | Georgetown | 3 hr |
| Oct 10, 5:13 PM EDT | Flash Flood Warning | CAE | Lexington | 3 hr |
| Oct 10, 6:14 PM EDT | Flash Flood Warning | CAE | Aiken, Lexington | 3 hr |
| Oct 10, 6:17 PM EDT | Flash Flood Warning | CAE | Clarendon, Sumter | 3 hr |
| Oct 10, 8:08 PM EDT | Flash Flood Warning | CAE | Clarendon | 2 hr |
| Oct 10, 8:43 PM EDT | Flash Flood Warning | ILM | Dillon, Horry, Marion | 5 hr |
| Oct 10, 9:00 PM EDT | Flash Flood Warning | ILM | Williamsburg | 3 hr |
| Dec 22, 7:20 AM EST | Flash Flood Warning | CAE | Richland | 115 min |
| Dec 28, 9:12 PM EST | Flash Flood Warning | GSP | Oconee | 3 hr |
| Dec 30, 9:14 AM EST | Flash Flood Warning | GSP | Cherokee, Greenville, Spartanburg | 6 hr |
| Dec 30, 9:29 AM EST | Flash Flood Warning | GSP | Abbeville, Greenwood | 12 hr |
| Dec 30, 9:34 AM EST | Flash Flood Warning | GSP | Anderson, Greenville | 6 hr |
| Dec 30, 9:42 AM EST | Flash Flood Warning | GSP | York | 6 hr |
| Dec 30, 10:08 AM EST | Flash Flood Warning | GSP | Laurens | 5 hr |
| Dec 30, 10:33 AM EST | Flash Flood Warning | CAE | McCormick | 4 hr |
| Dec 30, 11:09 AM EST | Flash Flood Warning | CAE | Newberry | 4 hr |
| Dec 30, 11:17 AM EST | Flash Flood Warning | GSP | Chester, Spartanburg, Union | 6 hr |
| Dec 30, 11:18 AM EST | Flash Flood Warning | GSP | York | 6 hr |
| Dec 30, 11:43 AM EST | Flash Flood Warning | CAE | Fairfield, Lancaster | 6 hr |
| Dec 30, 1:37 PM EST | Flash Flood Warning | CAE | Chesterfield | 4 hr |
| Dec 30, 2:59 PM EST | Flash Flood Warning | GSP | Laurens | 6 hr |
| Dec 30, 3:15 PM EST | Flash Flood Warning | GSP | Cherokee, Greenville, Spartanburg | 6 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Richland County23
- Charleston County17
- Berkeley County15
- Lexington County14
- Horry County10
- Sumter County9
- Dorchester County9
- Clarendon County9
- Florence County8
- Marion County8
- Calhoun County7
- Orangeburg County7
- Greenville County6
- Spartanburg County6
- Georgetown County6
- Williamsburg County6
- Newberry County5
- Saluda County5
- Aiken County5
- Greenwood County4
- Fairfield County4
- Colleton County4
- York County3
- Cherokee County3
- Edgefield County3
- McCormick County3
- Kershaw County3
- Lee County3
- Dillon County3
- Laurens County3
- Oconee County2
- Pickens County2
- Beaufort County2
- Chesterfield County2
- Darlington County2
- Marlboro County2
- Abbeville County2
- Lancaster County2
- Jasper County1
- Allendale 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.