Alert archive / South Carolina / Florence County

Weather alerts in Florence County, South Carolina, 2021

89 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Florence County and its neighbors

Each county as a circle sized by its count in 2021. Tap one for its archive.

Alerts
89
Warnings
26
Watches
12
Advisories
22
Busiest month
July15 alerts
Busiest day
July 8, 20216 alerts

Over time

By month

Warning verification

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

Florence County, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings10640%475%14 min
Flash flood warnings110%0

Each office's whole area, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Wilmington, NC: tornado warnings12283%580%1 min
NWS Wilmington, NC: severe thunderstorm warnings462350%5779%19 min
NWS Wilmington, NC: flash flood warnings8538%786%99 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.

IssuedProductOfficeLasted
Dec 31, 11:55 PM ESTDense Fog AdvisoryILM10 hr
Jan 2, 4:28 AM ESTRiver Flood WarningILM21 days
Jan 5, 9:21 AM ESTRiver Flood WarningILM21 days
Jan 12, 11:13 PM ESTDense Fog AdvisoryILM10 hr
Jan 14, 10:50 AM ESTRiver Flood WarningILM58 hr
Jan 16, 12:29 AM ESTDense Fog AdvisoryILM6 hr
Jan 25, 7:15 PM ESTDense Fog AdvisoryILM13 hr
Jan 28, 8:51 PM ESTRiver Flood WarningILM39 days
Feb 12, 8:53 PM ESTRiver Flood WarningILM21 days
Feb 16, 11:41 AM ESTRiver Flood WarningILM21 days
Feb 18, 3:16 AM ESTFlash Flood WatchILM28 hr
Feb 18, 5:11 PM ESTAreal Flood AdvisoryILM3 hr
Feb 19, 3:45 AM ESTAreal Flood AdvisoryILM2 hr
Feb 22, 11:27 PM ESTDense Fog AdvisoryILM7 hr
Mar 1, 10:56 AM ESTSpecial Weather StatementILM64 min
Mar 1, 11:25 AM ESTSpecial Weather StatementILM65 min
Mar 20, 9:08 AM EDTRiver Flood WarningILM5 days
Mar 26, 1:56 PM EDTMesoscale DiscussionSPC94 min
Mar 27, 6:21 AM EDTDense Fog AdvisoryILM4 hr
Mar 27, 9:10 AM EDTRiver Flood WarningILM12 days
Mar 28, 12:38 PM EDTMesoscale DiscussionSPC3 hr
Mar 28, 4:32 PM EDTSpecial Weather StatementILM43 min
Mar 31, 2:22 PM EDTMesoscale DiscussionSPC113 min
Mar 31, 3:44 PM EDTFreeze WatchILM23 hr
Mar 31, 6:24 PM EDTMesoscale DiscussionSPC2 hr
Mar 31, 8:09 PM EDTSpecial Weather StatementILM36 min
Apr 1, 2:45 PM EDTFreeze WarningILM17 hr
Apr 2, 8:21 AM EDTFreeze WarningILM25 hr
Apr 20, 3:42 PM EDTFire Weather WatchILM12 hr
Apr 21, 3:17 AM EDTRed Flag WarningILM16 hr
Apr 30, 3:27 AM EDTRed Flag WarningILM16 hr
May 3, 4:26 PM EDTMesoscale DiscussionSPC94 min
May 3, 4:45 PM EDTSevere Thunderstorm WarningILM60 min
May 3, 5:25 PM EDTSevere Thunderstorm WarningILM21 min
May 4, 4:16 PM EDTMesoscale DiscussionSPC119 min
May 4, 4:56 PM EDTSevere Thunderstorm WatchSPC3 hr
May 4, 6:26 PM EDTSpecial Weather StatementILM49 min
May 4, 7:04 PM EDTSevere Thunderstorm WarningILM41 min
May 4, 7:42 PM EDTSevere Thunderstorm WarningILM33 min
May 7, 3:30 PM EDTFire Weather WatchILM15 hr
May 29, 12:37 PM EDTMesoscale DiscussionSPC113 min
Jun 3, 11:50 AM EDTSpecial Weather StatementILM70 min
Jun 10, 10:28 PM EDTSpecial Weather StatementILM47 min
Jun 12, 1:14 PM EDTMesoscale DiscussionSPC3 hr
Jun 12, 7:02 PM EDTAreal Flood AdvisoryILM88 min
Jun 15, 12:57 PM EDTMesoscale DiscussionSPC63 min
Jun 15, 1:58 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 15, 2:39 PM EDTSpecial Weather StatementILM66 min
Jun 15, 3:12 PM EDTSevere Thunderstorm WarningILM48 min
Jun 15, 4:09 PM EDTMesoscale DiscussionSPC96 min
Jun 20, 3:35 AM EDTFlash Flood WatchILM19 hr
Jun 20, 6:28 PM EDTSpecial Weather StatementILM47 min
Jun 20, 7:16 PM EDTSpecial Weather StatementILM44 min
Jun 25, 6:29 PM EDTAreal Flood AdvisoryILM2 hr
Jul 8, 1:38 AM EDTMesoscale DiscussionSPC2 hr
Jul 8, 2:01 AM EDTTornado WatchSPC7 hr
Jul 8, 3:50 AM EDTAreal Flood AdvisoryILM3 hr
Jul 8, 5:25 AM EDTMesoscale DiscussionSPC2 hr
Jul 8, 6:27 AM EDTAreal Flood AdvisoryILM2 hr
Jul 8, 10:41 AM EDTRiver Flood WarningILM33 hr
Jul 9, 5:56 PM EDTSevere Thunderstorm WarningILM21 min
Jul 17, 4:05 PM EDTSpecial Weather StatementILM55 min
Jul 18, 3:58 PM EDTSevere Thunderstorm WarningILM32 min
Jul 18, 4:30 PM EDTSpecial Weather StatementILM30 min
Jul 18, 4:56 PM EDTSevere Thunderstorm WarningILM34 min
Jul 28, 6:07 PM EDTMesoscale DiscussionSPC83 min
Jul 28, 6:14 PM EDTSevere Thunderstorm WarningILM19 min
Jul 29, 3:16 PM EDTHeat AdvisoryILM28 hr
Jul 31, 1:40 PM EDTMesoscale DiscussionSPC2 hr
Aug 1, 3:47 AM EDTHeat AdvisoryILM15 hr
Aug 1, 12:37 PM EDTSevere Thunderstorm WatchSPC7 hr
Aug 1, 2:53 PM EDTMesoscale DiscussionSPC97 min
Aug 1, 4:29 PM EDTSevere Thunderstorm WarningILM46 min
Aug 1, 7:43 PM EDTSpecial Weather StatementILM62 min
Aug 3, 3:20 AM EDTFlash Flood WatchILM4 min
Aug 3, 11:38 AM EDTAreal Flood AdvisoryILM85 min
Aug 3, 12:55 PM EDTFlash Flood WarningILM3 hr
Aug 9, 5:18 AM EDTDense Fog AdvisoryILM4 hr
Aug 22, 1:18 PM EDTAreal Flood AdvisoryILM87 min
Sep 21, 3:12 AM EDTFlash Flood WatchILM39 hr
Sep 23, 7:03 AM EDTRiver Flood WarningILM50 hr
Nov 13, 3:00 PM ESTFrost AdvisoryILM17 hr
Nov 15, 2:10 PM ESTFrost AdvisoryILM18 hr
Nov 22, 4:18 AM ESTFreeze WatchILM22 hr
Nov 23, 2:18 AM ESTFreeze WarningILM31 hr
Dec 6, 2:11 AM ESTDense Fog AdvisoryILM8 hr
Dec 8, 10:38 PM ESTDense Fog AdvisoryILM10 hr
Dec 11, 8:17 PM ESTSpecial Weather StatementILM28 min
Dec 18, 3:21 AM ESTDense Fog AdvisoryILM6 hr

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force nowTornadoes on recordForecastThe radar archive20202022

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.