Alert archive / South Carolina
Weather alerts in South Carolina, 2024
2,687 weather alerts in 2024, 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 2024. Tap one for its archive.
- Alerts
- 2,687
- Warnings
- 772
- Watches
- 81
- Advisories
- 584
- Busiest month
- July570 alerts
- Busiest day
- January 9, 202486 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
29 of 97 tornado warnings covering South Carolina in 2024 had a tornado report inside them; 57 of 73 tornado reports fell inside a warning, on average 12 minutes after it went out.
South Carolina, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 97 | 29 | 70% | 73 | 78% | 12 min |
| Severe thunderstorm warnings | 399 | 286 | 28% | 756 | 80% | 23 min |
| Flash flood warnings | 116 | 75 | 35% | 225 | 90% | 195 min |
Each office's whole area, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Greenville-Spartanburg, SC: tornado warnings | 17 | 7 | 59% | 18 | 50% | 9 min |
| NWS Greenville-Spartanburg, SC: severe thunderstorm warnings | 289 | 209 | 28% | 588 | 82% | 24 min |
| NWS Greenville-Spartanburg, SC: flash flood warnings | 116 | 54 | 53% | 144 | 90% | 138 min |
| NWS Columbia, SC: tornado warnings | 23 | 13 | 43% | 23 | 61% | 9 min |
| NWS Columbia, SC: severe thunderstorm warnings | 158 | 121 | 23% | 344 | 88% | 23 min |
| NWS Columbia, SC: flash flood warnings | 53 | 40 | 25% | 118 | 92% | 102 min |
| NWS Charleston, SC: tornado warnings | 60 | 12 | 80% | 45 | 82% | 13 min |
| NWS Charleston, SC: severe thunderstorm warnings | 78 | 48 | 38% | 263 | 64% | 25 min |
| NWS Charleston, SC: flash flood warnings | 19 | 11 | 42% | 65 | 74% | 406 min |
| NWS Wilmington, NC: tornado warnings | 51 | 5 | 90% | 9 | 89% | 11 min |
| NWS Wilmington, NC: severe thunderstorm warnings | 102 | 60 | 41% | 173 | 83% | 26 min |
| NWS Wilmington, NC: flash flood warnings | 41 | 29 | 29% | 95 | 96% | 202 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
2,687 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.
- Horry County287
- Georgetown County266
- Richland County262
- Lexington County249
- Berkeley County217
- Orangeburg County214
- Kershaw County209
- Calhoun County204
- Greenville County188
- Colleton County174
- Fairfield County172
- Chesterfield County170
- Clarendon County168
- Lancaster County166
- Spartanburg County162
- Sumter County161
- York County161
- Aiken County161
- Florence County157
- Newberry County157
- Bamberg County156
- Dorchester County150
- Marion County148
- Saluda County146
- Edgefield County145
- Williamsburg County144
- Lee County143
- McCormick County141
- Charleston County139
- Pickens County137
- Barnwell County136
- Dillon County135
- Marlboro County133
- Union County133
- Hampton County131
- Jasper County127
- Anderson County125
- Chester County125
- Cherokee County124
- Laurens County122
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20232025
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.