Alert archive / South Carolina
Weather alerts in South Carolina, 2015
2,955 weather alerts in 2015, 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 2015. Tap one for its archive.
- Alerts
- 2,955
- Warnings
- 1,000
- Watches
- 94
- Advisories
- 765
- Busiest month
- June628 alerts
- Busiest day
- August 6, 201574 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
6 of 12 tornado warnings covering South Carolina in 2015 had a tornado report inside them; 10 of 17 tornado reports fell inside a warning, on average 11 minutes after it went out.
South Carolina, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 12 | 6 | 50% | 17 | 59% | 11 min |
| Severe thunderstorm warnings | 476 | 369 | 22% | 874 | 84% | 24 min |
| 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: tornado warnings | 5 | 3 | 40% | 5 | 60% | 12 min |
| NWS Columbia, SC: severe thunderstorm warnings | 183 | 140 | 23% | 309 | 91% | 23 min |
| NWS Columbia, SC: flash flood warnings | 39 | 30 | 23% | 110 | 94% | 77 min |
| NWS Greenville-Spartanburg, SC: tornado warnings | 4 | 0 | 100% | 2 | 0% | |
| NWS Greenville-Spartanburg, SC: severe thunderstorm warnings | 263 | 207 | 21% | 515 | 85% | 22 min |
| NWS Greenville-Spartanburg, SC: flash flood warnings | 63 | 43 | 32% | 144 | 76% | 131 min |
| NWS Charleston, SC: tornado warnings | 5 | 3 | 40% | 11 | 82% | 9 min |
| NWS Charleston, SC: severe thunderstorm warnings | 180 | 137 | 24% | 503 | 79% | 23 min |
| NWS Charleston, SC: flash flood warnings | 21 | 17 | 19% | 192 | 96% | 473 min |
| NWS Wilmington, NC: tornado warnings | 6 | 3 | 50% | 9 | 56% | 5 min |
| NWS Wilmington, NC: severe thunderstorm warnings | 89 | 56 | 37% | 153 | 72% | 22 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
2,955 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
- Richland County248
- Lexington County232
- Horry County223
- Colleton County182
- Georgetown County181
- Greenville County178
- Anderson County177
- Florence County175
- Aiken County174
- York County173
- Kershaw County170
- Dorchester County168
- Calhoun County166
- Marion County162
- Laurens County159
- Charleston County159
- Greenwood County157
- Sumter County154
- Abbeville County153
- Newberry County152
- Saluda County151
- Spartanburg County151
- Williamsburg County150
- Clarendon County148
- Edgefield County148
- Fairfield County148
- Marlboro County146
- Dillon County145
- Darlington County141
- Chesterfield County140
- Union County139
- Lee County131
- Cherokee County130
- Barnwell County127
- Chester County127
- Hampton County127
- Orangeburg County127
- Beaufort County126
- McCormick County124
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.