Alert archive / North Carolina / Alexander County

Weather alerts in Alexander County, North Carolina, 2017

131 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Alexander County and its neighbors

Each county as a circle sized by its count in 2017. Tap one for its archive.

Alerts
131
Warnings
28
Watches
18
Advisories
29
Busiest month
March26 alerts
Busiest day
May 24, 20175 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 Alexander County in 2017 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 20 minutes after it went out.

Alexander County, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings4175%1100%20 min
Severe thunderstorm warnings121017%1040%30 min
Flash flood warnings00

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Greenville-Spartanburg, SC: tornado warnings351266%4693%19 min
NWS Greenville-Spartanburg, SC: severe thunderstorm warnings28622721%73676%20 min
NWS Greenville-Spartanburg, SC: flash flood warnings231439%5064%48 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 5, 3:15 PM ESTWinter Storm WarningGSP46 hr
Jan 6, 8:56 PM ESTMesoscale DiscussionSPC6 hr
Jan 7, 3:18 AM ESTMesoscale DiscussionSPC5 hr
Jan 7, 3:42 AM ESTWind Chill AdvisoryGSP32 hr
Jan 7, 3:04 PM ESTWinter Weather AdvisoryGSP21 hr
Jan 8, 2:55 PM ESTWinter Weather AdvisoryGSP21 hr
Jan 9, 2:48 PM ESTWinter Weather AdvisoryGSP21 hr
Jan 21, 3:31 AM ESTDense Fog AdvisoryGSP8 hr
Feb 8, 4:11 AM ESTDense Fog AdvisoryGSP6 hr
Feb 8, 7:19 PM ESTSpecial Weather StatementGSP26 min
Feb 12, 3:51 AM ESTWind AdvisoryGSP33 hr
Feb 23, 2:55 AM ESTDense Fog AdvisoryGSP7 hr
Mar 1, 2:07 PM ESTMesoscale DiscussionSPC113 min
Mar 1, 3:02 PM ESTSevere Thunderstorm WatchSPC7 hr
Mar 1, 5:07 PM ESTTornado WarningGSP38 min
Mar 2, 3:13 PM ESTFreeze WatchGSP13 hr
Mar 3, 4:22 AM ESTFreeze WarningGSP29 hr
Mar 3, 2:57 PM ESTFreeze WatchGSP18 hr
Mar 4, 9:10 AM ESTFreeze WarningGSP24 hr
Mar 9, 3:47 PM ESTFreeze WatchGSP12 hr
Mar 10, 3:53 AM ESTFreeze WarningGSP29 hr
Mar 10, 3:33 PM ESTWinter Weather AdvisoryGSP42 hr
Mar 11, 3:20 PM ESTFreeze WatchGSP12 hr
Mar 12, 4:06 AM EDTFreeze WarningGSP30 hr
Mar 12, 3:47 PM EDTFreeze WatchGSP12 hr
Mar 13, 3:53 AM EDTFreeze WatchGSP24 hr
Mar 14, 3:25 AM EDTFreeze WatchGSP25 hr
Mar 14, 3:25 AM EDTFreeze WarningGSP32 hr
Mar 15, 3:55 AM EDTFreeze WarningGSP31 hr
Mar 15, 9:59 PM EDTFreeze WatchGSP6 hr
Mar 16, 3:31 AM EDTFreeze WarningGSP30 hr
Mar 19, 4:10 AM EDTFreeze WarningGSP29 hr
Mar 22, 3:50 AM EDTFreeze WarningGSP29 hr
Mar 27, 5:36 PM EDTSevere Thunderstorm WarningGSP39 min
Mar 27, 6:15 PM EDTSpecial Weather StatementGSP60 min
Mar 31, 6:06 AM EDTSpecial Weather StatementGSP39 min
Mar 31, 6:47 AM EDTSpecial Weather StatementGSP73 min
Mar 31, 2:06 PM EDTSpecial Weather StatementGSP39 min
Apr 5, 3:31 PM EDTWind AdvisoryGSP52 hr
Apr 5, 11:50 PM EDTSevere Thunderstorm WatchSPC6 hr
Apr 6, 12:52 AM EDTSevere Thunderstorm WarningGSP38 min
Apr 6, 3:25 PM EDTFreeze WatchGSP23 hr
Apr 7, 2:54 PM EDTFrost AdvisoryGSP18 hr
Apr 8, 2:37 PM EDTFrost AdvisoryGSP18 hr
Apr 21, 2:13 PM EDTMesoscale DiscussionSPC2 hr
Apr 21, 4:19 PM EDTMesoscale DiscussionSPC56 min
Apr 22, 5:55 AM EDTDense Fog AdvisoryGSP3 hr
Apr 22, 2:57 PM EDTFlood WatchGSP61 hr
Apr 23, 8:11 PM EDTSpecial Weather StatementGSP2 hr
Apr 23, 8:24 PM EDTSpecial Weather StatementGSP111 min
Apr 23, 10:34 PM EDTSpecial Weather StatementGSP41 min
Apr 24, 2:42 PM EDTAreal Flood AdvisoryGSP9 hr
Apr 28, 6:37 AM EDTDense Fog AdvisoryGSP3 hr
May 1, 4:02 PM EDTMesoscale DiscussionSPC118 min
May 4, 10:33 PM EDTSpecial Weather StatementGSP42 min
May 9, 8:25 PM EDTSpecial Weather StatementGSP50 min
May 11, 4:47 PM EDTMesoscale DiscussionSPC2 hr
May 19, 2:24 PM EDTMesoscale DiscussionSPC2 hr
May 22, 1:54 PM EDTFlash Flood WatchGSP36 hr
May 23, 6:37 AM EDTAreal Flood AdvisoryGSP113 min
May 24, 4:23 AM EDTFlash Flood WatchGSP18 hr
May 24, 10:04 AM EDTTornado WatchSPC11 hr
May 24, 3:02 PM EDTMesoscale DiscussionSPC88 min
May 24, 4:15 PM EDTTornado WarningGSP31 min
May 24, 5:25 PM EDTMesoscale DiscussionSPC65 min
May 27, 6:11 PM EDTMesoscale DiscussionSPC64 min
May 27, 6:55 PM EDTSevere Thunderstorm WatchSPC9 hr
May 27, 10:46 PM EDTMesoscale DiscussionSPC89 min
May 27, 10:57 PM EDTSpecial Weather StatementGSP48 min
May 28, 1:38 AM EDTSpecial Weather StatementGSP52 min
Jun 4, 3:15 PM EDTMesoscale DiscussionSPC90 min
Jun 4, 3:32 PM EDTSpecial Weather StatementGSP43 min
Jun 13, 3:24 PM EDTSevere Thunderstorm WarningGSP51 min
Jun 13, 4:25 PM EDTSevere Thunderstorm WarningGSP50 min
Jun 14, 1:17 PM EDTMesoscale DiscussionSPC2 hr
Jun 16, 1:27 PM EDTMesoscale DiscussionSPC3 hr
Jun 16, 4:46 PM EDTSpecial Weather StatementGSP29 min
Jun 16, 5:12 PM EDTSpecial Weather StatementGSP33 min
Jun 16, 5:17 PM EDTSpecial Weather StatementGSP28 min
Jul 1, 1:29 PM EDTSpecial Weather StatementGSP91 min
Jul 1, 1:44 PM EDTSevere Thunderstorm WarningGSP61 min
Jul 1, 4:07 PM EDTSpecial Weather StatementGSP23 min
Jul 3, 3:51 PM EDTSpecial Weather StatementGSP39 min
Jul 4, 2:12 PM EDTSpecial Weather StatementGSP63 min
Jul 4, 3:43 PM EDTSpecial Weather StatementGSP47 min
Jul 5, 3:39 PM EDTSevere Thunderstorm WarningGSP51 min
Jul 6, 5:22 PM EDTMesoscale DiscussionSPC113 min
Jul 9, 3:26 AM EDTDense Fog AdvisoryGSP7 hr
Jul 13, 4:09 PM EDTSpecial Weather StatementGSP51 min
Jul 13, 4:28 PM EDTSevere Thunderstorm WarningGSP47 min
Jul 13, 6:06 PM EDTSevere Thunderstorm WarningGSP39 min
Jul 13, 6:48 PM EDTSpecial Weather StatementGSP27 min
Jul 14, 3:05 PM EDTSpecial Weather StatementGSP25 min
Jul 14, 3:37 PM EDTSpecial Weather StatementGSP23 min
Jul 15, 3:32 PM EDTSpecial Weather StatementGSP28 min
Jul 15, 4:27 PM EDTSevere Thunderstorm WarningGSP48 min
Jul 17, 4:43 PM EDTSevere Thunderstorm WarningGSP47 min
Jul 17, 5:23 PM EDTSevere Thunderstorm WarningGSP52 min
Jul 18, 2:31 PM EDTMesoscale DiscussionSPC59 min
Jul 23, 11:36 AM EDTMesoscale DiscussionSPC2 hr
Jul 27, 3:28 PM EDTSpecial Weather StatementGSP32 min
Jul 28, 3:26 PM EDTSpecial Weather StatementGSP34 min
Jul 28, 3:58 PM EDTSpecial Weather StatementGSP32 min
Jul 28, 4:26 PM EDTSpecial Weather StatementGSP34 min
Aug 4, 7:32 PM EDTSpecial Weather StatementGSP43 min
Aug 15, 7:52 AM EDTDense Fog AdvisoryGSP92 min
Aug 17, 7:04 PM EDTAreal Flood AdvisoryGSP116 min
Sep 1, 1:49 PM EDTTornado WatchSPC8 hr
Sep 1, 4:53 PM EDTSpecial Weather StatementGSP52 min
Sep 1, 5:16 PM EDTSevere Thunderstorm WarningGSP44 min
Sep 1, 7:23 PM EDTMesoscale DiscussionSPC97 min
Sep 5, 3:36 PM EDTMesoscale DiscussionSPC54 min
Sep 5, 4:56 PM EDTSpecial Weather StatementGSP34 min
Sep 5, 5:29 PM EDTSpecial Weather StatementGSP31 min
Sep 10, 3:34 PM EDTWind AdvisoryGSP36 hr
Oct 15, 5:08 AM EDTDense Fog AdvisoryGSP5 hr
Oct 17, 3:35 AM EDTFrost AdvisoryGSP29 hr
Oct 23, 1:07 PM EDTMesoscale DiscussionSPC113 min
Oct 23, 2:00 PM EDTTornado WatchSPC8 hr
Oct 23, 4:25 PM EDTTornado Warning Tornado observedGSP35 min
Oct 23, 4:33 PM EDTMesoscale DiscussionSPC57 min
Oct 23, 4:50 PM EDTTornado Warning Tornado observedGSP14 min
Oct 25, 3:13 AM EDTFrost AdvisoryGSP30 hr
Oct 26, 2:54 PM EDTFrost AdvisoryGSP18 hr
Oct 29, 4:29 AM EDTFreeze WarningGSP30 hr
Nov 13, 5:15 AM ESTDense Fog AdvisoryGSP6 hr
Nov 22, 3:50 AM ESTDense Fog AdvisoryGSP5 hr
Dec 7, 4:42 PM ESTWinter Weather AdvisoryGSP43 hr
Dec 7, 9:47 PM ESTWinter Storm WarningGSP38 hr
Dec 9, 2:45 PM ESTWinter Weather AdvisoryGSP19 hr
Dec 19, 5:02 AM ESTDense Fog AdvisoryGSP5 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 archive20162018

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.