Alert archive / South Carolina / Lancaster County

Weather alerts in Lancaster County, South Carolina, 2012

104 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Lancaster County and its neighbors

Each county as a circle sized by its count in 2012. Tap one for its archive.

Alerts
104
Warnings
27
Watches
7
Advisories
12
Busiest month
July37 alerts
Busiest day
July 1, 20127 alerts

Over time

By month

Warning verification

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

Lancaster County, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings241825%1486%17 min
Flash flood warnings330%1580%70 min

Each office's whole area, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Columbia, SC: tornado warnings9367%560%4 min
NWS Columbia, SC: severe thunderstorm warnings24618326%39686%22 min
NWS Columbia, SC: flash flood warnings141214%3990%46 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 17, 9:01 PM ESTSpecial Weather StatementCAE59 min
Feb 23, 12:25 AM ESTSpecial Weather StatementCAE80 min
Feb 24, 6:56 AM ESTMesoscale DiscussionSPC94 min
Feb 24, 8:48 AM ESTTornado WatchSPC7 hr
Mar 2, 7:08 AM ESTSevere Thunderstorm WarningCAE52 min
Mar 3, 3:58 AM ESTMesoscale DiscussionSPC92 min
Mar 3, 4:39 AM ESTSevere Thunderstorm WatchSPC4 hr
Mar 3, 5:23 AM ESTSevere Thunderstorm WarningCAE67 min
Mar 24, 12:03 PM EDTMesoscale DiscussionSPC117 min
Mar 24, 1:53 PM EDTSevere Thunderstorm WatchSPC7 hr
Mar 24, 4:16 PM EDTMesoscale DiscussionSPC59 min
Mar 24, 6:02 PM EDTSevere Thunderstorm WarningCAE43 min
Mar 24, 6:42 PM EDTSevere Thunderstorm WarningCAE48 min
Mar 24, 7:21 PM EDTMesoscale DiscussionSPC84 min
Apr 2, 1:48 PM EDTMesoscale DiscussionSPC87 min
Apr 2, 4:31 PM EDTSevere Thunderstorm WarningCAE44 min
Apr 5, 1:03 PM EDTMesoscale DiscussionSPC87 min
Apr 5, 1:47 PM EDTSevere Thunderstorm WatchSPC7 hr
Apr 5, 3:37 PM EDTMesoscale DiscussionSPC53 min
Apr 26, 10:37 AM EDTSpecial Weather StatementCAE38 min
Apr 26, 11:19 AM EDTSpecial Weather StatementCAE41 min
Apr 27, 2:42 PM EDTMesoscale DiscussionSPC2 hr
Apr 27, 5:36 PM EDTSevere Thunderstorm WatchSPC6 hr
Apr 27, 8:54 PM EDTMesoscale DiscussionSPC96 min
May 9, 11:32 AM EDTMesoscale DiscussionSPC88 min
May 14, 5:25 PM EDTSpecial Weather StatementCAE35 min
May 14, 7:38 PM EDTSevere Thunderstorm WarningCAE52 min
May 14, 8:19 PM EDTAreal Flood AdvisoryCAE116 min
May 15, 1:07 PM EDTMesoscale DiscussionSPC113 min
May 15, 2:27 PM EDTSevere Thunderstorm WatchSPC7 hr
May 15, 6:30 PM EDTMesoscale DiscussionSPC90 min
May 15, 8:42 PM EDTMesoscale DiscussionSPC63 min
May 16, 4:21 PM EDTSpecial Weather StatementCAE54 min
May 22, 9:33 PM EDTSpecial Weather StatementCAE57 min
Jun 1, 2:22 PM EDTSpecial Weather StatementCAE53 min
Jun 1, 7:11 PM EDTSpecial Weather StatementCAE34 min
Jun 1, 7:21 PM EDTSpecial Weather StatementCAE39 min
Jun 11, 12:39 PM EDTAreal Flood AdvisoryCAE111 min
Jun 11, 1:59 PM EDTAreal Flood AdvisoryCAE2 hr
Jun 23, 6:23 PM EDTSpecial Weather StatementCAE52 min
Jun 23, 9:57 PM EDTSpecial Weather StatementCAE63 min
Jun 23, 10:26 PM EDTSpecial Weather StatementCAE34 min
Jun 23, 10:38 PM EDTAreal Flood AdvisoryCAE112 min
Jun 24, 12:53 PM EDTMesoscale DiscussionSPC97 min
Jun 24, 5:02 PM EDTAreal Flood AdvisoryCAE58 min
Jul 1, 1:39 PM EDTMesoscale DiscussionSPC96 min
Jul 1, 2:01 PM EDTSevere Thunderstorm WatchSPC9 hr
Jul 1, 2:12 PM EDTSevere Thunderstorm WarningCAE48 min
Jul 1, 3:30 PM EDTSevere Thunderstorm WarningCAE60 min
Jul 1, 4:27 PM EDTSevere Thunderstorm WarningCAE48 min
Jul 1, 7:18 PM EDTSevere Thunderstorm WarningCAE72 min
Jul 1, 7:39 PM EDTMesoscale DiscussionSPC96 min
Jul 1, 9:45 PM EDTMesoscale DiscussionSPC60 min
Jul 3, 6:23 PM EDTMesoscale DiscussionSPC3 hr
Jul 3, 8:56 PM EDTSpecial Weather StatementCAE49 min
Jul 5, 1:40 PM EDTMesoscale DiscussionSPC95 min
Jul 5, 5:30 PM EDTSevere Thunderstorm WarningCAE45 min
Jul 5, 6:34 PM EDTSevere Thunderstorm WarningCAE41 min
Jul 5, 6:41 PM EDTMesoscale DiscussionSPC94 min
Jul 5, 7:14 PM EDTSevere Thunderstorm WarningCAE46 min
Jul 9, 3:41 PM EDTSevere Thunderstorm WarningCAE49 min
Jul 10, 12:23 PM EDTMesoscale DiscussionSPC2 hr
Jul 16, 12:58 PM EDTMesoscale DiscussionSPC62 min
Jul 16, 5:24 PM EDTSevere Thunderstorm WarningCAE51 min
Jul 20, 2:47 PM EDTMesoscale DiscussionSPC2 hr
Jul 20, 3:23 PM EDTSpecial Weather StatementCAE37 min
Jul 20, 6:27 PM EDTAreal Flood AdvisoryCAE2 hr
Jul 21, 1:49 PM EDTSpecial Weather StatementCAE56 min
Jul 21, 2:17 PM EDTMesoscale DiscussionSPC2 hr
Jul 22, 2:20 PM EDTMesoscale DiscussionSPC2 hr
Jul 23, 12:58 PM EDTMesoscale DiscussionSPC3 hr
Jul 24, 1:29 AM EDTSevere Thunderstorm WarningCAE46 min
Jul 24, 1:12 PM EDTMesoscale DiscussionSPC93 min
Jul 24, 4:52 PM EDTSpecial Weather StatementGSP23 min
Jul 24, 6:04 PM EDTSevere Thunderstorm WarningCAE41 min
Jul 28, 2:18 PM EDTMesoscale DiscussionSPC117 min
Jul 28, 8:01 PM EDTSpecial Weather StatementCAE59 min
Jul 28, 8:21 PM EDTSevere Thunderstorm WarningCAE39 min
Jul 28, 9:04 PM EDTSpecial Weather StatementCAE56 min
Jul 28, 9:08 PM EDTSevere Thunderstorm WarningCAE52 min
Jul 28, 11:28 PM EDTSpecial Weather StatementCAE47 min
Jul 30, 4:38 PM EDTSevere Thunderstorm WarningCAE52 min
Aug 2, 9:56 PM EDTAreal Flood AdvisoryCAE64 min
Aug 3, 9:04 PM EDTSevere Thunderstorm WarningCAE26 min
Aug 7, 8:07 PM EDTAreal Flood AdvisoryCAE113 min
Aug 9, 9:47 PM EDTSpecial Weather StatementCAE58 min
Aug 9, 11:22 PM EDTAreal Flood AdvisoryCAE53 min
Aug 17, 6:17 PM EDTSevere Thunderstorm WarningCAE58 min
Aug 17, 7:11 PM EDTSevere Thunderstorm WarningCAE64 min
Aug 28, 4:49 PM EDTAreal Flood AdvisoryCAE116 min
Sep 3, 1:52 PM EDTMesoscale DiscussionSPC53 min
Sep 4, 6:02 PM EDTSpecial Weather StatementCAE28 min
Sep 8, 1:14 PM EDTMesoscale DiscussionSPC2 hr
Sep 17, 5:06 AM EDTAreal Flood AdvisoryCAE114 min
Sep 17, 5:25 AM EDTFlash Flood WarningCAE110 min
Sep 17, 7:23 AM EDTFlash Flood WarningCAE3 hr
Sep 17, 7:53 AM EDTFlash Flood WarningCAE3 hr
Sep 17, 9:07 AM EDTAreal Flood AdvisoryCAE113 min
Sep 18, 11:35 AM EDTMesoscale DiscussionSPC85 min
Sep 29, 5:49 PM EDTMesoscale DiscussionSPC56 min
Sep 29, 6:39 PM EDTSevere Thunderstorm WarningCAE51 min
Oct 2, 9:41 AM EDTMesoscale DiscussionSPC94 min
Dec 20, 6:37 PM ESTSpecial Weather StatementCAE83 min
Dec 26, 8:07 AM ESTMesoscale DiscussionSPC83 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 archive20112013

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.