Flash Flood Warnings in South Carolina, 2012

By month

19 of 28 flash flood warnings covering South Carolina in 2012 had a flash flood report inside them; 61 of 70 flash flood reports fell inside a warning, on average 92 minutes after it went out.

South Carolina, 2012

Each office's whole area, 2012

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.

• Richland County8
• Berkeley County6
• Charleston County6
• Colleton County4
• Greenville County3
• Lancaster County3
• Lexington County2
• Allendale County2
• Beaufort County2
• Dorchester County2
• Chesterfield County2
• Darlington County1
• Florence County1
• Jasper County1
• Kershaw County1
• Lee County1
• York County1
• Hampton County1
• Anderson County1
• Pickens County1

1. May 17, 20123flash flood warnings
2. September 17, 20123flash flood warnings
3. May 30, 20122flash flood warnings
4. July 31, 20122flash flood warnings
5. August 29, 20122flash flood warnings
6. October 2, 20122flash flood warnings
7. March 25, 20121flash flood warnings
8. April 22, 20121flash flood warnings
9. May 29, 20121flash flood warnings
10. June 11, 20121flash flood warnings
11. June 24, 20121flash flood warnings
12. June 26, 20121flash flood warnings

Alerts in force nowTornadoes on recordThe radar archive20112013

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.