Alert archive / South Carolina
Weather alerts in South Carolina, 2014
2,487 weather alerts in 2014, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.
Weather alerts by county
Each county as a circle sized by its count in 2014. Tap one for its archive.
- Alerts
- 2,487
- Warnings
- 701
- Watches
- 96
- Advisories
- 708
- Busiest month
- June485 alerts
- Busiest day
- January 11, 201460 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
3 of 8 tornado warnings covering South Carolina in 2014 had a tornado report inside them; 3 of 8 tornado reports fell inside a warning, on average 9 minutes after it went out.
South Carolina, 2014
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 8 | 3 | 63% | 8 | 38% | 9 min |
| Severe thunderstorm warnings | 365 | 272 | 25% | 537 | 85% | 22 min |
| Flash flood warnings | 61 | 41 | 33% | 115 | 87% | 69 min |
Each office's whole area, 2014
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Columbia, SC: tornado warnings | 2 | 2 | 0% | 3 | 67% | 4 min |
| NWS Columbia, SC: severe thunderstorm warnings | 124 | 98 | 21% | 192 | 92% | 23 min |
| NWS Columbia, SC: flash flood warnings | 18 | 12 | 33% | 27 | 85% | 30 min |
| NWS Charleston, SC: tornado warnings | 3 | 0 | 100% | 2 | 0% | |
| NWS Charleston, SC: severe thunderstorm warnings | 113 | 78 | 31% | 225 | 73% | 22 min |
| NWS Charleston, SC: flash flood warnings | 27 | 17 | 37% | 74 | 89% | 78 min |
| NWS Greenville-Spartanburg, SC: tornado warnings | 15 | 2 | 87% | 4 | 50% | 9 min |
| NWS Greenville-Spartanburg, SC: severe thunderstorm warnings | 319 | 214 | 33% | 481 | 83% | 21 min |
| NWS Greenville-Spartanburg, SC: flash flood warnings | 45 | 27 | 40% | 88 | 78% | 74 min |
| NWS Wilmington, NC: tornado warnings | 7 | 0 | 100% | 2 | 0% | |
| NWS Wilmington, NC: severe thunderstorm warnings | 81 | 61 | 25% | 162 | 77% | 21 min |
| NWS Wilmington, NC: flash flood warnings | 1 | 0 | 100% | 0 |
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
2,487 alerts are too many to list on one page. Narrow it to a product above, to a month in the chart, or to a county.
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Berkeley County253
- Dorchester County193
- Richland County187
- Horry County186
- Colleton County175
- Charleston County172
- Lexington County165
- Greenville County152
- Kershaw County151
- Hampton County147
- York County146
- Marion County144
- Aiken County139
- Calhoun County139
- Georgetown County139
- Laurens County138
- Florence County136
- Sumter County135
- Spartanburg County131
- Beaufort County129
- Chesterfield County128
- Clarendon County127
- Fairfield County127
- Anderson County126
- Chester County124
- Newberry County119
- Jasper County119
- Dillon County117
- Allendale County116
- Lee County115
- Saluda County115
- Williamsburg County114
- Barnwell County111
- Cherokee County111
- Greenwood County111
- Marlboro County110
- Pickens County108
- Abbeville County107
- Union County106
- Darlington County106
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20132015
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.