Tornado Warnings in South Carolina, 2017

By month

25 of 70 tornado warnings covering South Carolina in 2017 had a tornado report inside them; 59 of 71 tornado reports fell inside a warning, on average 12 minutes after it went out.

South Carolina, 2017

Each office's whole area, 2017

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.

• Orangeburg County8
• Colleton County8
• Charleston County8
• Dorchester County7
• Horry County7
• Barnwell County6
• Union County6
• Laurens County5
• Cherokee County5
• Bamberg County4
• Berkeley County4
• Lexington County4
• Calhoun County4
• Marion County4
• Clarendon County4
• Spartanburg County4
• Pickens County3
• Edgefield County3
• Sumter County3
• Saluda County3
• Newberry County3
• Aiken County2
• Hampton County2
• Greenville County2
• McCormick County2
• Richland County2
• Georgetown County2
• Fairfield County2
• Beaufort County2
• Allendale County1
• Jasper County1
• Oconee County1
• Chester County1
• Williamsburg County1
• Florence County1
• Darlington County1
• Lancaster County1
• Dillon County1
• Greenwood County1

1. October 8, 201711tornado warnings
2. September 11, 20179tornado warnings
3. April 3, 20177tornado warnings
4. April 5, 20177tornado warnings
5. May 5, 20177tornado warnings
6. May 24, 20176tornado warnings
7. October 23, 20175tornado warnings
8. January 21, 20174tornado warnings
9. February 15, 20174tornado warnings
10. January 3, 20171tornado warnings
11. February 9, 20171tornado warnings
12. March 31, 20171tornado warnings

Alerts in force nowTornadoes on recordThe radar archive20162018

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.