Alert archive / North Carolina / Henderson County

Weather alerts in Henderson County, North Carolina, 2021

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

Henderson County and its neighbors

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

Alerts
107
Warnings
31
Watches
16
Advisories
31
Busiest month
August36 alerts
Busiest day
August 17, 202111 alerts

Over time

By month

Warning verification

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

0 of 2 tornado warnings covering Henderson County in 2021 had a tornado report inside them.

Henderson County, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings20100%0
Severe thunderstorm warnings7357%1100%2 min
Flash flood warnings5260%1100%59 min

Each office's whole area, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Greenville-Spartanburg, SC: tornado warnings63887%2378%24 min
NWS Greenville-Spartanburg, SC: severe thunderstorm warnings1769546%26763%17 min
NWS Greenville-Spartanburg, SC: flash flood warnings472253%5770%94 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 1, 11:56 AM ESTAreal Flood AdvisoryGSP5 hr
Jan 1, 7:37 PM ESTRiver Flood WarningGSP25 hr
Jan 2, 8:09 PM ESTRiver Flood AdvisoryGSP14 hr
Jan 6, 2:33 PM ESTWinter Storm WatchGSP24 hr
Jan 7, 4:31 AM ESTWinter Storm WarningGSP40 hr
Jan 7, 2:51 PM ESTWinter Weather AdvisoryGSP29 hr
Jan 7, 10:54 PM ESTMesoscale DiscussionSPC3 hr
Jan 8, 8:12 PM ESTWinter Weather AdvisoryGSP16 hr
Jan 27, 3:13 PM ESTWind AdvisoryGSP25 hr
Jan 29, 2:57 PM ESTWinter Storm WatchGSP13 hr
Jan 30, 4:21 AM ESTWinter Storm WarningGSP31 hr
Feb 1, 4:23 AM ESTWind AdvisoryGSP57 hr
Feb 5, 11:49 AM ESTWinter Storm WatchGSP16 hr
Feb 6, 3:58 AM ESTWinter Storm WarningGSP32 hr
Feb 6, 10:08 PM ESTMesoscale DiscussionSPC4 hr
Feb 16, 2:48 PM ESTWinter Storm WatchGSP13 hr
Feb 17, 4:15 AM ESTWinter Storm WarningGSP32 hr
Mar 18, 6:52 PM EDTRiver Flood AdvisoryGSP31 hr
Mar 25, 2:40 PM EDTTornado WarningGSP50 min
Mar 25, 6:50 PM EDTAreal Flood AdvisoryGSP3 hr
Mar 25, 7:11 PM EDTRiver Flood WarningGSP3 days
Mar 25, 7:19 PM EDTRiver Flood AdvisoryGSP3 hr
Mar 25, 9:48 PM EDTAreal Flood WarningGSP14 hr
Mar 25, 10:18 PM EDTRiver Flood WarningGSP59 hr
Mar 27, 12:50 PM EDTFlash Flood WatchGSP23 hr
Mar 28, 10:05 AM EDTRiver Flood AdvisoryGSP23 hr
Mar 28, 10:34 PM EDTRiver Flood AdvisoryGSP9 hr
Mar 30, 3:19 PM EDTFlash Flood WatchGSP24 hr
Mar 31, 4:25 AM EDTWind AdvisoryGSP43 hr
Mar 31, 1:03 PM EDTRiver Flood AdvisoryGSP14 hr
Mar 31, 2:04 PM EDTRiver Flood AdvisoryGSP13 hr
Apr 20, 3:28 AM EDTFreeze WatchGSP24 hr
Apr 21, 3:40 AM EDTFreeze WarningGSP29 hr
Apr 21, 8:58 PM EDTFreeze WatchGSP7 hr
Apr 22, 3:35 AM EDTFreeze WarningGSP29 hr
Apr 29, 2:40 PM EDTWind AdvisoryGSP33 hr
Jun 9, 1:39 PM EDTSpecial Weather StatementGSP21 min
Jun 11, 4:58 PM EDTSpecial Weather StatementGSP32 min
Jun 11, 5:22 PM EDTAreal Flood AdvisoryGSP113 min
Jun 19, 3:03 PM EDTFlash Flood WatchGSP23 hr
Jul 10, 5:14 PM EDTSpecial Weather StatementGSP31 min
Jul 10, 6:06 PM EDTSpecial Weather StatementGSP24 min
Jul 10, 6:37 PM EDTSpecial Weather StatementGSP23 min
Jul 10, 7:04 PM EDTSpecial Weather StatementGSP26 min
Jul 11, 3:35 PM EDTSpecial Weather StatementGSP25 min
Jul 12, 10:59 PM EDTSpecial Weather StatementGSP31 min
Jul 12, 11:32 PM EDTSevere Thunderstorm WarningGSP43 min
Jul 14, 4:49 PM EDTSpecial Weather StatementGSP26 min
Jul 17, 5:06 PM EDTSpecial Weather StatementGSP24 min
Jul 27, 5:03 PM EDTSpecial Weather StatementGSP27 min
Aug 7, 2:03 PM EDTSpecial Weather StatementGSP42 min
Aug 10, 2:49 PM EDTSpecial Weather StatementGSP26 min
Aug 10, 3:04 PM EDTSevere Thunderstorm WarningGSP29 min
Aug 11, 12:28 PM EDTSpecial Weather StatementGSP47 min
Aug 13, 2:37 PM EDTSpecial Weather StatementGSP23 min
Aug 14, 3:04 PM EDTSevere Thunderstorm WarningGSP21 min
Aug 14, 4:22 PM EDTSevere Thunderstorm WarningGSP53 min
Aug 14, 5:53 PM EDTSpecial Weather StatementGSP37 min
Aug 14, 7:38 PM EDTAreal Flood AdvisoryGSP112 min
Aug 16, 2:52 AM EDTAreal Flood AdvisoryGSP3 hr
Aug 16, 4:59 AM EDTFlash Flood WarningGSP3 hr
Aug 16, 2:20 PM EDTFlash Flood WatchGSP40 hr
Aug 17, 2:22 AM EDTRiver Flood WarningGSP4 days
Aug 17, 3:01 AM EDTRiver Flood AdvisoryGSP79 min
Aug 17, 4:20 AM EDTRiver Flood WarningGSP4 days
Aug 17, 10:42 AM EDTTornado WatchSPC8 hr
Aug 17, 3:25 PM EDTMesoscale DiscussionSPC2 hr
Aug 17, 4:16 PM EDTFlash Flood WarningGSP5 hr
Aug 17, 4:20 PM EDTTornado WarningGSP12 min
Aug 17, 4:35 PM EDTFlash Flood WarningGSP8 hr
Aug 17, 5:55 PM EDTMesoscale DiscussionSPC65 min
Aug 17, 6:16 PM EDTFlash Flood WarningGSP3 hr
Aug 17, 6:28 PM EDTTornado WatchSPC10 hr
Aug 17, 9:52 PM EDTAreal Flood WarningGSP14 hr
Aug 18, 3:15 AM EDTRiver Flood WarningGSP44 hr
Aug 18, 1:28 PM EDTRiver Flood WarningGSP69 hr
Aug 19, 3:18 PM EDTSpecial Weather StatementGSP27 min
Aug 19, 3:35 PM EDTSevere Thunderstorm WarningGSP40 min
Aug 20, 11:50 PM EDTRiver Flood AdvisoryGSP23 hr
Aug 21, 3:47 PM EDTSpecial Weather StatementGSP43 min
Aug 21, 4:46 PM EDTSpecial Weather StatementGSP44 min
Aug 21, 7:34 PM EDTAreal Flood AdvisoryGSP3 hr
Aug 26, 5:37 PM EDTSpecial Weather StatementGSP23 min
Aug 27, 3:04 AM EDTDense Fog AdvisoryGSP7 hr
Aug 30, 3:09 PM EDTFlash Flood WatchGSP39 hr
Aug 31, 4:30 PM EDTSevere Thunderstorm WarningGSP45 min
Sep 8, 12:37 PM EDTSpecial Weather StatementGSP23 min
Sep 8, 1:00 PM EDTSpecial Weather StatementGSP30 min
Sep 8, 1:36 PM EDTSevere Thunderstorm WarningGSP39 min
Sep 20, 3:01 PM EDTFlash Flood WatchGSP20 hr
Oct 5, 2:45 PM EDTFlash Flood WatchGSP69 hr
Oct 7, 6:40 AM EDTAreal Flood AdvisoryGSP3 hr
Oct 7, 8:10 AM EDTFlash Flood WarningGSP3 hr
Oct 7, 9:41 AM EDTRiver Flood AdvisoryGSP3 days
Oct 7, 9:46 AM EDTRiver Flood WarningGSP68 hr
Oct 7, 11:19 AM EDTAreal Flood WarningGSP6 hr
Oct 7, 11:49 AM EDTAreal Flood AdvisoryGSP8 hr
Oct 17, 3:43 AM EDTFrost AdvisoryGSP29 hr
Oct 25, 9:40 PM EDTWind AdvisoryGSP20 hr
Dec 18, 3:29 AM ESTDense Fog AdvisoryGSP8 hr
Dec 29, 9:44 PM ESTMesoscale DiscussionSPC2 hr
Dec 29, 10:16 PM ESTTornado WatchSPC7 hr
Dec 29, 11:21 PM ESTSpecial Weather StatementGSP39 min
Dec 29, 11:56 PM ESTMesoscale DiscussionSPC2 hr
Dec 31, 4:18 AM ESTDense Fog AdvisoryGSP5 hr
Dec 31, 9:04 AM ESTDense Fog AdvisoryGSP56 min
Dec 31, 10:02 AM ESTDense Fog AdvisoryGSP58 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 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.