Alert archive / South Carolina / Colleton County

Weather alerts in Colleton County, South Carolina, 2020

100 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Colleton County and its neighbors

Each county as a circle sized by its count in 2020. Tap one for its archive.

Alerts
100
Warnings
28
Watches
8
Advisories
33
Busiest month
August21 alerts
Busiest day
April 13, 20209 alerts

Over time

By month

Warning verification

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

4 of 7 tornado warnings covering Colleton County in 2020 had a tornado report inside them; 6 of 6 tornado reports fell inside a warning, on average 12 minutes after it went out.

Colleton County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings7443%6100%12 min
Severe thunderstorm warnings151313%3364%26 min
Flash flood warnings00

Each office's whole area, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Charleston, SC: tornado warnings201050%1989%12 min
NWS Charleston, SC: severe thunderstorm warnings725031%30169%27 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
Jan 12, 7:22 PM ESTDense Fog AdvisoryCHS15 hr
Jan 13, 9:20 PM ESTDense Fog AdvisoryCHS9 hr
Jan 17, 10:21 AM ESTRiver Flood WarningCHS21 days
Jan 24, 4:39 PM ESTMesoscale DiscussionSPC2 hr
Feb 6, 5:30 PM ESTTornado WatchSPC7 hr
Feb 6, 7:32 PM ESTMesoscale DiscussionSPC118 min
Feb 7, 3:48 AM ESTWind AdvisoryCHS11 hr
Feb 7, 2:34 PM ESTRiver Flood WarningCHS40 days
Feb 13, 2:37 PM ESTSpecial Weather StatementCHS23 min
Feb 13, 2:59 PM ESTSpecial Weather StatementCHS31 min
Feb 18, 3:11 PM ESTSpecial Weather StatementCHS34 min
Feb 18, 9:41 PM ESTDense Fog AdvisoryCHS8 hr
Feb 29, 2:25 AM ESTFreeze WatchCHS13 hr
Feb 29, 3:12 PM ESTFreeze WarningCHS17 hr
Mar 5, 12:38 PM ESTAreal Flood AdvisoryCHS82 min
Mar 5, 2:06 PM ESTAreal Flood AdvisoryCHS114 min
Mar 5, 4:01 PM ESTAreal Flood AdvisoryCHS119 min
Mar 5, 4:56 PM ESTAreal Flood AdvisoryCHS64 min
Mar 6, 3:10 PM ESTFreeze WatchCHS24 hr
Mar 7, 3:08 PM ESTFreeze WarningCHS17 hr
Mar 18, 5:44 AM EDTDense Fog AdvisoryCHS4 hr
Mar 31, 2:22 PM EDTTornado WatchSPC6 hr
Mar 31, 4:17 PM EDTSevere Thunderstorm WarningCHS58 min
Mar 31, 4:29 PM EDTSevere Thunderstorm WarningCHS61 min
Mar 31, 5:09 PM EDTSevere Thunderstorm WarningCHS55 min
Apr 13, 3:20 AM EDTTornado WatchSPC8 hr
Apr 13, 6:17 AM EDTMesoscale DiscussionSPC88 min
Apr 13, 6:18 AM EDTTornado Warning Tornado observedCHS27 min
Apr 13, 6:22 AM EDTSevere Thunderstorm WarningCHS53 min
Apr 13, 6:38 AM EDTTornado Warning EmergencyTornado observedCHS37 min
Apr 13, 6:53 AM EDTSevere Thunderstorm WarningCHS52 min
Apr 13, 7:01 AM EDTTornado Warning Tornado observedConsiderable damage threatCHS29 min
Apr 13, 7:42 AM EDTSevere Thunderstorm WarningCHS63 min
Apr 13, 8:00 AM EDTTornado WarningCHS30 min
Apr 20, 1:52 AM EDTMesoscale DiscussionSPC83 min
Apr 20, 2:19 AM EDTTornado WatchSPC9 hr
Apr 23, 2:22 PM EDTMesoscale DiscussionSPC83 min
Apr 23, 5:31 PM EDTAreal Flood AdvisoryCHS89 min
Apr 23, 6:45 PM EDTAreal Flood AdvisoryCHS6 hr
May 20, 10:12 AM EDTMesoscale DiscussionSPC2 hr
May 22, 6:44 PM EDTSevere Thunderstorm WarningCHS61 min
Jun 5, 5:49 PM EDTSpecial Weather StatementCHS41 min
Jun 5, 6:28 PM EDTSpecial Weather StatementCHS47 min
Jun 8, 4:33 PM EDTAreal Flood AdvisoryCHS87 min
Jun 8, 5:57 PM EDTAreal Flood AdvisoryCHS93 min
Jun 9, 7:14 PM EDTSpecial Weather StatementCHS31 min
Jun 10, 5:15 PM EDTSpecial Weather StatementCHS30 min
Jun 11, 5:09 PM EDTSpecial Weather StatementCHS36 min
Jun 11, 5:41 PM EDTAreal Flood AdvisoryCHS83 min
Jun 12, 3:28 AM EDTFlash Flood WatchCHS9 hr
Jun 19, 3:39 PM EDTSpecial Weather StatementCHS36 min
Jun 19, 3:53 PM EDTSevere Thunderstorm WarningCHS41 min
Jun 23, 7:13 PM EDTSevere Thunderstorm WarningCHS31 min
Jun 24, 6:27 PM EDTMesoscale DiscussionSPC93 min
Jun 27, 8:19 PM EDTSevere Thunderstorm WarningCHS41 min
Jun 27, 9:28 PM EDTSpecial Weather StatementCHS47 min
Jun 30, 3:29 AM EDTHeat AdvisoryCHS15 hr
Jul 7, 3:03 PM EDTAreal Flood AdvisoryCHS2 hr
Jul 27, 4:17 PM EDTSpecial Weather StatementCHS13 min
Jul 28, 5:42 PM EDTAreal Flood AdvisoryCHS3 hr
Jul 28, 7:24 PM EDTSpecial Weather StatementCHS36 min
Jul 28, 8:54 PM EDTSpecial Weather StatementCHS51 min
Aug 1, 11:13 AM EDTTropical Storm WatchCHS18 hr
Aug 1, 1:23 PM EDTMesoscale DiscussionSPC2 hr
Aug 3, 5:31 AM EDTWind AdvisoryCHS11 hr
Aug 5, 2:37 PM EDTAreal Flood AdvisoryCHS113 min
Aug 6, 2:16 PM EDTSpecial Weather StatementCHS29 min
Aug 7, 6:31 PM EDTSpecial Weather StatementCHS44 min
Aug 10, 5:36 PM EDTSpecial Weather StatementCHS24 min
Aug 10, 8:29 PM EDTSevere Thunderstorm WarningCHS61 min
Aug 13, 6:29 PM EDTAreal Flood AdvisoryCHS91 min
Aug 13, 6:55 PM EDTAreal Flood AdvisoryCHS65 min
Aug 13, 7:48 PM EDTAreal Flood AdvisoryCHS54 min
Aug 13, 8:00 PM EDTAreal Flood AdvisoryCHS90 min
Aug 14, 6:17 PM EDTSevere Thunderstorm WarningCHS43 min
Aug 18, 4:33 PM EDTSpecial Weather StatementCHS27 min
Aug 18, 4:47 PM EDTSevere Thunderstorm WarningCHS58 min
Aug 24, 4:32 PM EDTSpecial Weather StatementCHS43 min
Aug 24, 5:03 PM EDTTornado WarningCHS42 min
Aug 24, 5:22 PM EDTTornado WarningCHS53 min
Aug 24, 6:07 PM EDTAreal Flood AdvisoryCHS83 min
Aug 24, 6:58 PM EDTAreal Flood AdvisoryCHS2 hr
Aug 26, 4:40 PM EDTSevere Thunderstorm WarningCHS25 min
Sep 17, 8:22 AM EDTSpecial Weather StatementCHS23 min
Sep 17, 10:27 AM EDTMesoscale DiscussionSPC2 hr
Sep 23, 7:12 AM EDTRiver Flood WarningCHS13 days
Sep 25, 1:09 PM EDTMesoscale DiscussionSPC3 hr
Sep 25, 6:32 PM EDTMesoscale DiscussionSPC88 min
Sep 25, 6:58 PM EDTAreal Flood AdvisoryCHS62 min
Sep 25, 8:02 PM EDTSevere Thunderstorm WarningCHS43 min
Sep 25, 8:22 PM EDTAreal Flood AdvisoryCHS53 min
Sep 29, 2:36 PM EDTMesoscale DiscussionSPC2 hr
Oct 8, 4:20 AM EDTDense Fog AdvisoryCHS5 hr
Nov 2, 3:30 AM ESTFrost AdvisoryCHS28 hr
Nov 12, 2:01 PM ESTAreal Flood AdvisoryCHS119 min
Nov 14, 2:12 AM ESTDense Fog AdvisoryCHS6 hr
Nov 18, 3:32 PM ESTFrost AdvisoryCHS16 hr
Nov 18, 10:00 PM ESTFreeze WarningCHS9 hr
Nov 23, 12:52 AM ESTDense Fog AdvisoryCHS5 hr
Dec 24, 6:25 PM ESTTornado WarningCHS35 min

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 archive20192021

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.