Alert archive / South Carolina / Tornado Warnings

Tornado Warnings in South Carolina, 2011

50 tornado warnings in 2011. 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 tornado warnings reaches back to 1986.

Tornado Warnings by county

Each county as a circle sized by its count in 2011. Tap one for its archive.

Tornado Warnings
50
Busiest month
April30 tornado warnings
Busiest day
April 16, 201115 tornado warnings

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

18 of 50 tornado warnings covering South Carolina in 2011 had a tornado report inside them; 24 of 26 tornado reports fell inside a warning, on average 20 minutes after it went out.

South Carolina, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings501864%2692%20 min

Each office's whole area, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Charleston, SC: tornado warnings9278%1090%21 min
NWS Greenville-Spartanburg, SC: tornado warnings421174%2596%21 min
NWS Columbia, SC: tornado warnings13838%11100%15 min
NWS Wilmington, NC: tornado warnings321069%1878%23 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.

IssuedProductOfficeCountiesLasted
Feb 28, 4:59 PM ESTTornado WarningGSPGreenville, Spartanburg31 min
Feb 28, 6:25 PM ESTTornado WarningGSPAbbeville, Greenwood, Laurens35 min
Feb 28, 6:57 PM ESTTornado WarningGSPGreenwood, Laurens14 min
Feb 28, 7:13 PM ESTTornado WarningCAEFairfield, Lexington, Newberry, Richland, Saluda47 min
Mar 19, 5:42 PM EDTTornado WarningGSPGreenwood, Laurens48 min
Mar 19, 6:26 PM EDTTornado WarningCAENewberry, Saluda34 min
Mar 19, 6:30 PM EDTTornado WarningGSPGreenwood30 min
Apr 5, 4:39 AM EDTTornado WarningCHSAllendale, Colleton, Hampton40 min
Apr 9, 5:24 PM EDTTornado WarningGSPYork36 min
Apr 9, 6:01 PM EDTTornado WarningCAELancaster44 min
Apr 9, 6:06 PM EDTTornado WarningGSPYork12 min
Apr 16, 12:07 PM EDTTornado WarningILMDillon, Horry, Marion37 min
Apr 16, 1:56 PM EDTTornado WarningCAEChesterfield19 min
Apr 16, 2:48 PM EDTTornado WarningILMDarlington, Dillon, Marlboro42 min
Apr 16, 3:12 PM EDTTornado WarningCAEClarendon33 min
Apr 16, 3:27 PM EDTTornado WarningILMDillon, Marlboro48 min
Apr 16, 4:12 PM EDTTornado WarningCAEClarendon33 min
Apr 16, 4:17 PM EDTTornado WarningILMDillon, Horry, Marion58 min
Apr 16, 4:18 PM EDTTornado WarningILMFlorence, Williamsburg42 min
Apr 16, 4:53 PM EDTTornado WarningCHSBerkeley37 min
Apr 16, 5:03 PM EDTTornado WarningILMFlorence, Georgetown, Horry, Marion, Williamsburg42 min
Apr 16, 5:03 PM EDTTornado WarningILMDillon, Horry57 min
Apr 16, 5:28 PM EDTTornado WarningCHSBerkeley32 min
Apr 16, 5:28 PM EDTTornado WarningILMGeorgetown, Williamsburg47 min
Apr 16, 5:53 PM EDTTornado WarningCHSBerkeley52 min
Apr 16, 6:19 PM EDTTornado WarningILMGeorgetown26 min
Apr 27, 11:22 PM EDTTornado WarningGSPOconee, Pickens38 min
Apr 28, 12:04 AM EDTTornado WarningGSPOconee41 min
Apr 28, 12:21 AM EDTTornado WarningGSPOconee39 min
Apr 28, 12:54 AM EDTTornado WarningGSPOconee, Pickens51 min
Apr 28, 1:31 AM EDTTornado WarningGSPGreenville, Oconee, Pickens44 min
Apr 28, 7:30 AM EDTTornado WarningCAECalhoun, Clarendon, Richland, Sumter45 min
Apr 28, 8:05 AM EDTTornado WarningCAELee, Sumter25 min
Apr 28, 8:31 AM EDTTornado WarningILMFlorence, Marion24 min
Apr 28, 10:16 AM EDTTornado WarningILMDillon, Florence, Horry, Marion44 min
Apr 28, 12:15 PM EDTTornado WarningILMDillon, Marlboro34 min
Apr 28, 12:42 PM EDTTornado WarningILMDillon48 min
May 10, 5:39 PM EDTTornado WarningILMHorry30 min
May 10, 7:24 PM EDTTornado WarningILMGeorgetown, Williamsburg51 min
May 26, 9:52 PM EDTTornado WarningGSPYork38 min
Jun 19, 5:22 PM EDTTornado WarningGSPGreenville, Laurens, Spartanburg23 min
Sep 5, 3:14 PM EDTTornado WarningGSPYork46 min
Sep 5, 5:13 PM EDTTornado WarningCAEFairfield, Newberry47 min
Sep 5, 6:47 PM EDTTornado WarningCAELancaster28 min
Sep 25, 3:24 PM EDTTornado WarningCHSHampton51 min
Nov 16, 3:55 PM ESTTornado WarningGSPAbbeville, Anderson, Greenville, Greenwood, Laurens50 min
Nov 16, 4:36 PM ESTTornado WarningGSPLaurens, Spartanburg, Union39 min
Nov 16, 5:05 PM ESTTornado WarningGSPChester, Union, York40 min
Nov 16, 5:36 PM ESTTornado WarningCAELancaster33 min
Nov 16, 5:49 PM ESTTornado WarningCAEAiken, Barnwell41 min

By county

Every county with at least one alert. A county page lists each alert that covered it.

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force nowTornadoes on recordThe radar archive20102012

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.