Alert archive / South Carolina / Flash Flood Warnings
Flash Flood Warnings in South Carolina, 2016
37 flash flood warnings in 2016. 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 2016. Tap one for its archive.
- Flash Flood Warnings
- 37
- Busiest month
- October13 flash flood warnings
- Busiest day
- October 8, 20169 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.
32 of 37 flash flood warnings covering South Carolina in 2016 had a flash flood report inside them; 118 of 137 flash flood reports fell inside a warning, on average 141 minutes after it went out.
South Carolina, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 37 | 32 | 14% | 137 | 86% | 141 min |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Columbia, SC: flash flood warnings | 14 | 12 | 14% | 45 | 96% | 71 min |
| NWS Greenville-Spartanburg, SC: flash flood warnings | 23 | 19 | 17% | 79 | 87% | 91 min |
| NWS Wilmington, NC: flash flood warnings | 20 | 16 | 20% | 56 | 95% | 172 min |
| NWS Charleston, SC: flash flood warnings | 12 | 10 | 17% | 59 | 66% | 211 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 |
|---|---|---|---|---|
| Feb 3, 3:25 PM EST | Flash Flood Warning | CAE | Richland | 65 min |
| Apr 30, 8:07 PM EDT | Flash Flood Warning | GSP | York | 6 hr |
| Apr 30, 8:31 PM EDT | Flash Flood Warning | CAE | Lancaster | 2 hr |
| May 1, 5:49 PM EDT | Flash Flood Warning | CAE | Lexington, Richland | 86 min |
| May 1, 9:22 PM EDT | Flash Flood Warning | GSP | York | 6 hr |
| May 19, 5:32 PM EDT | Flash Flood Warning | CAE | Bamberg | 3 hr |
| May 29, 5:35 AM EDT | Flash Flood Warning | CHS | Beaufort, Jasper | 115 min |
| May 29, 7:32 AM EDT | Flash Flood Warning | CHS | Beaufort, Jasper | 3 hr |
| May 29, 8:54 AM EDT | Flash Flood Warning | CHS | Berkeley, Charleston, Dorchester | 3 hr |
| May 29, 2:25 PM EDT | Flash Flood Warning | CHS | Allendale, Hampton, Jasper | 3 hr |
| Jun 14, 3:51 PM EDT | Flash Flood Warning | CAE | Calhoun, Lexington, Richland | 114 min |
| Jun 28, 12:28 AM EDT | Flash Flood Warning | GSP | Greenville | 3 hr |
| Jun 30, 7:22 PM EDT | Flash Flood Warning | CHS | Allendale | 3 hr |
| Jul 11, 4:06 PM EDT | Flash Flood Warning | CAE | Chesterfield | 3 hr |
| Jul 16, 4:38 PM EDT | Flash Flood Warning | GSP | Cherokee, Spartanburg | 3 hr |
| Jul 21, 7:27 PM EDT | Flash Flood Warning | GSP | Spartanburg | 3 hr |
| Aug 1, 8:26 PM EDT | Flash Flood Warning | CAE | Richland | 94 min |
| Aug 1, 9:58 PM EDT | Flash Flood Warning | CAE | Richland | 77 min |
| Aug 7, 9:16 PM EDT | Flash Flood Warning | GSP | Spartanburg, Union | 3 hr |
| Sep 2, 11:56 AM EDT | Flash Flood Warning | CAE | Bamberg, Barnwell, Calhoun, Clarendon, Orangeburg | 4 hr |
| Sep 2, 2:15 PM EDT | Flash Flood Warning | ILM | Georgetown, Horry | 2 hr |
| Sep 2, 3:07 PM EDT | Flash Flood Warning | CAE | Aiken, Bamberg, Barnwell, Calhoun, Clarendon, Lexington and 3 more | 3 hr |
| Sep 2, 5:49 PM EDT | Flash Flood Warning | CAE | Calhoun, Clarendon, Kershaw, Lee, Lexington, Orangeburg and 2 more | 3 hr |
| Sep 12, 6:17 PM EDT | Flash Flood Warning | CAE | Orangeburg | 88 min |
| Oct 7, 5:48 PM EDT | Flash Flood Warning | CHS | Beaufort, Jasper | 17 hr |
| Oct 7, 7:53 PM EDT | Flash Flood Warning | CHS | Berkeley, Charleston, Colleton, Dorchester | 14 hr |
| Oct 8, 12:20 AM EDT | Flash Flood Warning | CHS | Allendale, Beaufort, Colleton, Hampton, Jasper | 10 hr |
| Oct 8, 2:56 AM EDT | Flash Flood Warning | CAE | Bamberg, Calhoun, Clarendon, Orangeburg, Richland, Sumter | 6 hr |
| Oct 8, 5:13 AM EDT | Flash Flood Warning | ILM | Dillon, Florence, Georgetown, Horry, Marion, Williamsburg | 8 hr |
| Oct 8, 7:27 AM EDT | Flash Flood Warning | CHS | Berkeley, Dorchester | 4 hr |
| Oct 8, 8:19 AM EDT | Flash Flood Warning | CAE | Bamberg, Calhoun, Clarendon, Lee, Orangeburg, Richland and 1 more | 6 hr |
| Oct 8, 9:42 AM EDT | Flash Flood Warning | CHS | Berkeley, Charleston, Colleton, Dorchester | 108 min |
| Oct 8, 10:19 AM EDT | Flash Flood Warning | ILM | Darlington, Dillon, Florence, Georgetown, Horry, Marion and 2 more | 6 hr |
| Oct 8, 12:29 PM EDT | Flash Flood Warning | ILM | Horry | 3 hr |
| Oct 8, 4:02 PM EDT | Flash Flood Warning | ILM | Dillon, Horry, Marion, Marlboro | 4 hr |
| Oct 8, 8:00 PM EDT | Flash Flood Warning | ILM | Horry | 8 hr |
| Oct 8, 8:05 PM EDT | Flash Flood Warning | ILM | Dillon, Marion, Marlboro | 4 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Richland County9
- Calhoun County6
- Orangeburg County6
- Horry County6
- Bamberg County5
- Jasper County5
- Clarendon County5
- Lexington County4
- Beaufort County4
- Berkeley County4
- Dorchester County4
- Sumter County4
- Dillon County4
- Marion County4
- Charleston County3
- Allendale County3
- Spartanburg County3
- Georgetown County3
- Colleton County3
- Marlboro County3
- York County2
- Hampton County2
- Barnwell County2
- Lee County2
- Florence County2
- Williamsburg County2
- Lancaster County1
- Greenville County1
- Chesterfield County1
- Cherokee County1
- Union County1
- Aiken County1
- Kershaw County1
- Darlington County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20152017
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.