Alert archive / North Carolina / Union County

Weather alerts in Union County, North Carolina, 2020

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

Union County and its neighbors

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

Alerts
204
Warnings
41
Watches
12
Advisories
44
Busiest month
May47 alerts
Busiest day
July 18, 202010 alerts

Over time

By month

Warning verification

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

1 of 4 tornado warnings covering Union County in 2020 had a tornado report inside them.

Union County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings4175%0
Severe thunderstorm warnings291452%1275%16 min
Flash flood warnings3167%1100%254 min

Each office's whole area, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Greenville-Spartanburg, SC: tornado warnings611379%2572%14 min
NWS Greenville-Spartanburg, SC: severe thunderstorm warnings32518344%52075%21 min
NWS Greenville-Spartanburg, SC: flash flood warnings794247%13871%121 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 3, 5:39 PM ESTSpecial Weather StatementGSP36 min
Jan 11, 5:38 PM ESTTornado WatchSPC6 hr
Jan 11, 8:40 PM ESTMesoscale DiscussionSPC95 min
Jan 11, 9:55 PM ESTSevere Thunderstorm WarningGSP65 min
Jan 11, 10:31 PM ESTTornado WarningGSP17 min
Jan 13, 10:33 AM ESTAreal Flood AdvisoryGSP6 hr
Jan 14, 4:53 AM ESTDense Fog AdvisoryGSP5 hr
Jan 15, 3:49 AM ESTDense Fog AdvisoryGSP6 hr
Feb 5, 4:20 AM ESTFlash Flood WatchGSP44 hr
Feb 6, 9:50 AM ESTMesoscale DiscussionSPC55 min
Feb 6, 10:12 AM ESTTornado WatchSPC7 hr
Feb 6, 12:02 PM ESTSevere Thunderstorm WarningGSP43 min
Feb 6, 12:11 PM ESTAreal Flood AdvisoryGSP3 hr
Feb 6, 12:12 PM ESTTornado WarningGSP33 min
Feb 6, 1:08 PM ESTMesoscale DiscussionSPC97 min
Feb 6, 1:54 PM ESTFlash Flood WarningGSP6 hr
Feb 6, 8:13 PM ESTAreal Flood WarningGSP6 hr
Feb 6, 9:47 PM ESTWind AdvisoryGSP20 hr
Feb 13, 9:47 AM ESTSevere Thunderstorm WarningGSP43 min
Feb 13, 10:26 AM ESTSpecial Weather StatementGSP49 min
Feb 13, 10:29 AM ESTMesoscale DiscussionSPC61 min
Feb 17, 4:22 AM ESTDense Fog AdvisoryGSP5 hr
Feb 19, 3:11 PM ESTWinter Weather AdvisoryGSP33 hr
Feb 26, 3:51 AM ESTDense Fog AdvisoryGSP6 hr
Mar 18, 2:29 AM EDTDense Fog AdvisoryGSP9 hr
Apr 8, 6:12 PM EDTSevere Thunderstorm WarningGSP48 min
Apr 8, 6:56 PM EDTSpecial Weather StatementGSP19 min
Apr 8, 8:15 PM EDTSpecial Weather StatementCAE45 min
Apr 8, 8:41 PM EDTSpecial Weather StatementGSP34 min
Apr 8, 8:49 PM EDTSpecial Weather StatementGSP41 min
Apr 8, 8:56 PM EDTSevere Thunderstorm WarningGSP49 min
Apr 8, 9:21 PM EDTAreal Flood AdvisoryGSP114 min
Apr 8, 9:42 PM EDTSpecial Weather StatementGSP33 min
Apr 9, 6:04 AM EDTSpecial Weather StatementCAE41 min
Apr 9, 6:09 AM EDTSpecial Weather StatementGSP51 min
Apr 9, 6:26 AM EDTSevere Thunderstorm WarningGSP34 min
Apr 9, 8:28 PM EDTRed Flag WarningGSP24 hr
Apr 10, 2:58 PM EDTFrost AdvisoryGSP18 hr
Apr 12, 3:56 AM EDTWind AdvisoryGSP36 hr
Apr 12, 11:17 PM EDTMesoscale DiscussionSPC88 min
Apr 13, 1:51 AM EDTTornado WatchSPC6 hr
Apr 13, 2:39 AM EDTMesoscale DiscussionSPC96 min
Apr 13, 5:10 AM EDTSevere Thunderstorm WarningGSP50 min
Apr 13, 5:48 AM EDTSevere Thunderstorm WarningGSP42 min
Apr 15, 3:46 AM EDTFrost AdvisoryGSP28 hr
Apr 16, 2:50 PM EDTFrost AdvisoryGSP17 hr
Apr 25, 8:58 PM EDTMesoscale DiscussionSPC92 min
Apr 25, 10:22 PM EDTTornado WarningGSP23 min
Apr 25, 10:59 PM EDTSevere Thunderstorm WarningGSP46 min
Apr 30, 2:25 AM EDTAreal Flood AdvisoryGSP4 hr
Apr 30, 2:47 AM EDTSpecial Weather StatementGSP28 min
Apr 30, 3:14 AM EDTSpecial Weather StatementGSP31 min
Apr 30, 3:45 AM EDTSpecial Weather StatementGSP30 min
Apr 30, 6:43 AM EDTAreal Flood AdvisoryGSP2 hr
May 4, 11:14 PM EDTSpecial Weather StatementGSP31 min
May 4, 11:43 PM EDTSpecial Weather StatementGSP32 min
May 5, 3:57 AM EDTSevere Thunderstorm WarningGSP48 min
May 5, 4:33 AM EDTSevere Thunderstorm WarningGSP27 min
May 5, 3:22 PM EDTMesoscale DiscussionSPC113 min
May 5, 3:53 PM EDTSevere Thunderstorm WatchSPC7 hr
May 5, 7:08 PM EDTMesoscale DiscussionSPC2 hr
May 6, 4:56 PM EDTSpecial Weather StatementGSP49 min
May 6, 5:13 PM EDTSpecial Weather StatementCAE32 min
May 6, 6:09 PM EDTSpecial Weather StatementGSP36 min
May 9, 11:10 AM EDTFrost AdvisoryGSP23 hr
May 18, 2:51 PM EDTFlash Flood WatchGSP3 days
May 18, 9:19 PM EDTSpecial Weather StatementGSP41 min
May 18, 10:38 PM EDTSpecial Weather StatementGSP52 min
May 18, 11:44 PM EDTAreal Flood AdvisoryGSP6 hr
May 19, 1:44 AM EDTSpecial Weather StatementGSP46 min
May 19, 1:04 PM EDTMesoscale DiscussionSPC3 hr
May 21, 1:12 PM EDTSevere Thunderstorm WarningGSP33 min
May 21, 1:39 PM EDTSevere Thunderstorm WarningGSP51 min
May 21, 2:02 PM EDTAreal Flood WarningGSP3 hr
May 21, 2:40 PM EDTSpecial Weather StatementGSP35 min
May 21, 4:53 PM EDTAreal Flood AdvisoryGSP3 hr
May 22, 4:46 AM EDTDense Fog AdvisoryGSP5 hr
May 22, 12:43 PM EDTMesoscale DiscussionSPC62 min
May 22, 1:18 PM EDTSevere Thunderstorm WatchSPC6 hr
May 22, 3:49 PM EDTMesoscale DiscussionSPC86 min
May 22, 3:51 PM EDTSevere Thunderstorm WarningGSP24 min
May 22, 4:12 PM EDTSevere Thunderstorm WarningGSP33 min
May 22, 4:30 PM EDTSevere Thunderstorm WarningGSP30 min
May 22, 5:28 PM EDTAreal Flood AdvisoryGSP3 hr
May 23, 2:55 AM EDTDense Fog AdvisoryGSP6 hr
May 24, 1:44 PM EDTMesoscale DiscussionSPC2 hr
May 24, 3:33 PM EDTSpecial Weather StatementGSP27 min
May 24, 3:58 PM EDTSpecial Weather StatementGSP32 min
May 24, 4:42 PM EDTSevere Thunderstorm WarningGSP48 min
May 27, 3:37 AM EDTFlash Flood WatchGSP22 hr
May 27, 5:56 PM EDTAreal Flood AdvisoryGSP9 hr
May 28, 3:09 PM EDTSevere Thunderstorm WarningGSP51 min
May 28, 3:28 PM EDTAreal Flood AdvisoryGSP3 hr
May 28, 7:43 PM EDTAreal Flood AdvisoryGSP2 hr
May 29, 11:16 AM EDTSpecial Weather StatementCAE44 min
May 29, 12:13 PM EDTSpecial Weather StatementGSP32 min
May 29, 12:20 PM EDTSpecial Weather StatementGSP40 min
May 29, 12:37 PM EDTMesoscale DiscussionSPC113 min
May 29, 12:39 PM EDTSevere Thunderstorm WarningGSP39 min
May 29, 12:58 PM EDTSevere Thunderstorm WarningGSP32 min
May 29, 1:01 PM EDTAreal Flood AdvisoryGSP6 hr
Jun 5, 3:48 PM EDTSpecial Weather StatementGSP27 min
Jun 7, 9:47 PM EDTSpecial Weather StatementGSP28 min
Jun 7, 10:16 PM EDTSpecial Weather StatementGSP29 min
Jun 8, 8:30 PM EDTSpecial Weather StatementGSP30 min
Jun 8, 9:11 PM EDTSpecial Weather StatementGSP34 min
Jun 11, 11:50 AM EDTFlash Flood WatchGSP16 hr
Jun 11, 10:23 PM EDTSpecial Weather StatementGSP52 min
Jun 11, 10:54 PM EDTSpecial Weather StatementGSP36 min
Jun 11, 11:05 PM EDTSevere Thunderstorm WarningGSP40 min
Jun 22, 7:14 PM EDTSpecial Weather StatementGSP31 min
Jun 25, 5:48 PM EDTMesoscale DiscussionSPC87 min
Jun 28, 4:53 PM EDTSpecial Weather StatementCAE22 min
Jun 28, 5:12 PM EDTSevere Thunderstorm WarningGSP48 min
Jun 28, 5:33 PM EDTMesoscale DiscussionSPC87 min
Jun 30, 6:49 PM EDTSpecial Weather StatementGSP41 min
Jul 13, 1:21 PM EDTMesoscale DiscussionSPC84 min
Jul 13, 2:20 PM EDTSpecial Weather StatementGSP25 min
Jul 13, 4:30 PM EDTSpecial Weather StatementGSP30 min
Jul 17, 8:03 PM EDTSpecial Weather StatementGSP27 min
Jul 17, 8:45 PM EDTSpecial Weather StatementCAE30 min
Jul 17, 8:47 PM EDTSpecial Weather StatementGSP28 min
Jul 17, 9:14 PM EDTSpecial Weather StatementGSP31 min
Jul 18, 3:51 PM EDTSpecial Weather StatementGSP24 min
Jul 18, 4:15 PM EDTSpecial Weather StatementGSP30 min
Jul 18, 4:33 PM EDTSevere Thunderstorm WarningGSP31 min
Jul 18, 5:59 PM EDTSevere Thunderstorm WarningGSP46 min
Jul 18, 6:00 PM EDTSpecial Weather StatementCAE45 min
Jul 18, 6:33 PM EDTSevere Thunderstorm WarningGSP24 min
Jul 19, 2:27 PM EDTHeat AdvisoryGSP28 hr
Jul 20, 12:57 PM EDTMesoscale DiscussionSPC2 hr
Jul 20, 2:49 PM EDTHeat AdvisoryGSP29 hr
Jul 20, 4:06 PM EDTSpecial Weather StatementGSP24 min
Jul 20, 4:45 PM EDTSpecial Weather StatementGSP30 min
Jul 20, 4:49 PM EDTSevere Thunderstorm WarningGSP41 min
Jul 21, 1:00 PM EDTMesoscale DiscussionSPC2 hr
Jul 21, 2:52 PM EDTHeat AdvisoryGSP29 hr
Jul 22, 7:27 PM EDTSpecial Weather StatementGSP33 min
Jul 24, 3:25 PM EDTSpecial Weather StatementGSP35 min
Jul 24, 3:42 PM EDTSpecial Weather StatementGSP33 min
Jul 24, 3:44 PM EDTSevere Thunderstorm WarningGSP27 min
Jul 24, 4:16 PM EDTSpecial Weather StatementGSP29 min
Jul 24, 4:22 PM EDTSpecial Weather StatementGSP23 min
Jul 24, 5:11 PM EDTSpecial Weather StatementGSP34 min
Jul 28, 10:44 PM EDTSpecial Weather StatementGSP31 min
Jul 29, 1:03 PM EDTSpecial Weather StatementGSP57 min
Jul 29, 1:54 PM EDTSpecial Weather StatementGSP51 min
Jul 29, 2:44 PM EDTSpecial Weather StatementGSP31 min
Aug 1, 1:23 PM EDTMesoscale DiscussionSPC2 hr
Aug 6, 2:08 PM EDTMesoscale DiscussionSPC3 hr
Aug 9, 6:31 PM EDTSpecial Weather StatementGSP29 min
Aug 9, 6:39 PM EDTSpecial Weather StatementGSP36 min
Aug 9, 7:13 PM EDTAreal Flood AdvisoryGSP2 hr
Aug 10, 4:44 PM EDTSpecial Weather StatementGSP31 min
Aug 10, 5:34 PM EDTSpecial Weather StatementGSP26 min
Aug 10, 5:41 PM EDTSevere Thunderstorm WarningGSP29 min
Aug 10, 6:09 PM EDTAreal Flood AdvisoryGSP2 hr
Aug 12, 6:44 PM EDTSpecial Weather StatementGSP46 min
Aug 15, 3:09 PM EDTSpecial Weather StatementGSP36 min
Aug 15, 4:50 PM EDTFlash Flood WarningGSP3 hr
Aug 21, 12:04 PM EDTSpecial Weather StatementGSP26 min
Aug 21, 12:28 PM EDTSpecial Weather StatementGSP32 min
Aug 22, 3:32 AM EDTDense Fog AdvisoryGSP5 hr
Aug 31, 10:01 AM EDTSpecial Weather StatementGSP44 min
Aug 31, 10:10 AM EDTSevere Thunderstorm WarningGSP50 min
Aug 31, 11:00 AM EDTSpecial Weather StatementGSP30 min
Aug 31, 11:20 AM EDTSpecial Weather StatementGSP25 min
Aug 31, 3:47 PM EDTSpecial Weather StatementGSP43 min
Aug 31, 3:54 PM EDTMesoscale DiscussionSPC96 min
Sep 2, 12:58 AM EDTSpecial Weather StatementGSP32 min
Sep 2, 1:24 AM EDTSpecial Weather StatementGSP51 min
Sep 11, 6:43 PM EDTSpecial Weather StatementGSP32 min
Sep 16, 4:28 AM EDTFlood WatchGSP46 min
Sep 16, 5:14 AM EDTFlash Flood WatchGSP39 hr
Sep 25, 9:23 AM EDTAreal Flood AdvisoryGSP3 hr
Sep 27, 5:21 AM EDTDense Fog AdvisoryGSP4 hr
Sep 29, 2:36 PM EDTMesoscale DiscussionSPC2 hr
Sep 29, 3:24 PM EDTSpecial Weather StatementGSP36 min
Sep 29, 4:00 PM EDTSpecial Weather StatementGSP45 min
Oct 11, 7:26 AM EDTMesoscale DiscussionSPC94 min
Oct 11, 12:10 PM EDTSpecial Weather StatementGSP35 min
Oct 11, 6:22 PM EDTSpecial Weather StatementCAE23 min
Oct 11, 6:50 PM EDTTornado WarningGSP25 min
Oct 11, 9:10 PM EDTAreal Flood AdvisoryGSP3 hr
Oct 13, 2:33 AM EDTDense Fog AdvisoryGSP6 hr
Oct 15, 6:36 AM EDTDense Fog AdvisoryGSP3 hr
Oct 27, 3:53 AM EDTDense Fog AdvisoryGSP6 hr
Oct 28, 2:47 PM EDTWind AdvisoryGSP27 hr
Oct 29, 10:18 PM EDTSpecial Weather StatementGSP42 min
Oct 29, 10:52 PM EDTSpecial Weather StatementGSP53 min
Nov 2, 11:45 AM ESTFrost AdvisoryGSP21 hr
Nov 2, 11:45 AM ESTFreeze WarningGSP21 hr
Nov 10, 2:30 PM ESTFlood WatchGSP47 hr
Nov 12, 9:46 AM ESTFlash Flood WarningGSP4 hr
Nov 12, 1:57 PM ESTAreal Flood WarningGSP9 hr
Nov 15, 6:21 AM ESTDense Fog AdvisoryGSP4 hr
Nov 22, 10:55 PM ESTDense Fog AdvisoryGSP5 hr
Nov 26, 9:04 PM ESTDense Fog AdvisoryGSP14 hr
Nov 30, 6:44 AM ESTSpecial Weather StatementGSP46 min
Dec 4, 8:18 PM ESTSpecial Weather StatementGSP57 min
Dec 4, 9:14 PM ESTSpecial Weather StatementGSP16 min
Dec 14, 8:38 AM ESTSpecial Weather StatementGSP52 min
Dec 14, 9:25 AM ESTSpecial Weather StatementGSP50 min
Dec 31, 8:14 AM ESTDense Fog AdvisoryGSP3 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 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.