Flash Flood Warnings in South Carolina, 2013

By month

60 of 81 flash flood warnings covering South Carolina in 2013 had a flash flood report inside them; 188 of 212 flash flood reports fell inside a warning, on average 84 minutes after it went out.

South Carolina, 2013

Each office's whole area, 2013

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.

• Charleston County19
• Berkeley County14
• Greenville County12
• Dorchester County10
• Anderson County9
• Richland County8
• Jasper County8
• Pickens County8
• Oconee County7
• Spartanburg County6
• Colleton County6
• Laurens County6
• Beaufort County4
• Lexington County3
• Hampton County3
• Orangeburg County3
• Abbeville County3
• Aiken County2
• Edgefield County2
• Allendale County2
• McCormick County2
• Union County2
• Clarendon County1
• Cherokee County1
• Greenwood County1
• Lancaster County1
• Chester County1
• Calhoun County1
• Bamberg County1
• Barnwell County1
• Chesterfield County1

1. July 12, 201311flash flood warnings
2. July 11, 20135flash flood warnings
3. August 7, 20135flash flood warnings
4. June 30, 20134flash flood warnings
5. July 10, 20134flash flood warnings
6. July 13, 20133flash flood warnings
7. July 21, 20133flash flood warnings
8. July 31, 20133flash flood warnings
9. March 24, 20132flash flood warnings
10. May 21, 20132flash flood warnings
11. June 3, 20132flash flood warnings
12. June 19, 20132flash flood warnings

Alerts in force nowTornadoes on recordThe radar archive20122014

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.