Alert archive / North Carolina / Alamance County

Weather alerts in Alamance County, North Carolina, 2016

151 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Alamance County and its neighbors

Each county as a circle sized by its count in 2016. Tap one for its archive.

Alerts
151
Warnings
37
Watches
14
Advisories
23
Busiest month
June26 alerts
Busiest day
April 28, 201610 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 2 tornado warnings covering Alamance County in 2016 had a tornado report inside them.

Alamance County, 2016

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings2150%0
Severe thunderstorm warnings252116%16100%26 min
Flash flood warnings330%475%85 min

Each office's whole area, 2016

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Raleigh, NC: tornado warnings25388%1392%28 min
NWS Raleigh, NC: severe thunderstorm warnings30022326%54287%23 min
NWS Raleigh, NC: flash flood warnings663941%11388%153 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, 11:28 AM ESTWind AdvisoryRAH7 hr
Jan 20, 10:25 AM ESTWinter Weather AdvisoryRAH12 hr
Jan 20, 3:44 PM ESTWinter Storm WatchRAH13 hr
Jan 21, 4:52 AM ESTWinter Storm WarningRAH61 hr
Jan 21, 4:52 AM ESTWinter Weather AdvisoryRAH3 days
Jan 22, 11:47 AM ESTMesoscale DiscussionSPC6 hr
Jan 22, 4:42 PM ESTMesoscale DiscussionSPC6 hr
Feb 3, 1:41 PM ESTSpecial Weather StatementRAH64 min
Feb 3, 2:12 PM ESTSpecial Weather StatementRAH78 min
Feb 13, 3:42 PM ESTWinter Storm WatchRAH24 hr
Feb 14, 3:53 PM ESTWinter Weather AdvisoryRAH32 hr
Feb 14, 9:59 PM ESTWinter Storm WarningRAH29 hr
Feb 15, 5:02 AM ESTMesoscale DiscussionSPC6 hr
Feb 15, 2:11 PM ESTMesoscale DiscussionSPC4 hr
Feb 15, 11:34 PM ESTDense Fog AdvisoryRAH4 hr
Feb 21, 5:34 AM ESTDense Fog AdvisoryRAH3 hr
Feb 24, 10:46 AM ESTMesoscale DiscussionSPC119 min
Feb 24, 11:16 AM ESTTornado WatchSPC8 hr
Feb 24, 1:18 PM ESTMesoscale DiscussionSPC117 min
Feb 24, 2:44 PM ESTSevere Thunderstorm WarningRAH61 min
Feb 24, 2:55 PM ESTMesoscale DiscussionSPC95 min
Feb 24, 3:35 PM ESTTornado WarningRAH40 min
Mar 13, 8:14 PM EDTSpecial Weather StatementRAH61 min
Mar 13, 8:43 PM EDTMesoscale DiscussionSPC92 min
Mar 14, 2:21 PM EDTMesoscale DiscussionSPC84 min
Mar 14, 6:25 PM EDTMesoscale DiscussionSPC2 hr
Mar 14, 8:07 PM EDTSpecial Weather StatementRAH23 min
Mar 21, 3:07 AM EDTFrost AdvisoryRAH30 hr
Apr 4, 2:49 AM EDTFreeze WatchRAH24 hr
Apr 5, 2:49 AM EDTFreeze WarningRAH30 hr
Apr 7, 5:50 PM EDTSpecial Weather StatementRAH55 min
Apr 8, 4:24 AM EDTFreeze WatchRAH24 hr
Apr 8, 3:58 PM EDTRed Flag WarningRAH28 hr
Apr 9, 4:12 AM EDTFreeze WarningRAH29 hr
Apr 9, 4:12 AM EDTWind AdvisoryRAH15 hr
Apr 28, 3:56 PM EDTMesoscale DiscussionSPC64 min
Apr 28, 4:12 PM EDTSpecial Weather StatementRAH48 min
Apr 28, 4:19 PM EDTSevere Thunderstorm WarningRAH41 min
Apr 28, 4:21 PM EDTSevere Thunderstorm WatchSPC7 hr
Apr 28, 4:45 PM EDTSevere Thunderstorm WarningRAH60 min
Apr 28, 5:35 PM EDTSevere Thunderstorm WarningRAH55 min
Apr 28, 6:18 PM EDTSevere Thunderstorm WarningRAH42 min
Apr 28, 6:57 PM EDTAreal Flood AdvisoryRAH2 hr
Apr 28, 6:57 PM EDTSevere Thunderstorm WarningRAH48 min
Apr 28, 7:03 PM EDTMesoscale DiscussionSPC87 min
May 1, 9:48 AM EDTSpecial Weather StatementRAH57 min
May 2, 2:13 AM EDTSpecial Weather StatementRAH62 min
May 2, 4:28 PM EDTSevere Thunderstorm WarningRAH47 min
May 2, 4:52 PM EDTSpecial Weather StatementRAH53 min
May 2, 5:10 PM EDTSevere Thunderstorm WarningRAH35 min
May 2, 5:12 PM EDTAreal Flood AdvisoryRAH2 hr
May 3, 1:57 PM EDTMesoscale DiscussionSPC3 hr
May 3, 2:52 PM EDTSevere Thunderstorm WatchSPC8 hr
May 3, 4:11 PM EDTSevere Thunderstorm WarningRAH34 min
May 3, 4:44 PM EDTSevere Thunderstorm WarningRAH46 min
May 11, 2:12 PM EDTMesoscale DiscussionSPC2 hr
May 12, 6:57 PM EDTSpecial Weather StatementRAH33 min
May 12, 7:04 PM EDTSpecial Weather StatementRAH26 min
May 12, 7:07 PM EDTSevere Thunderstorm WarningRAH53 min
May 21, 2:20 PM EDTMesoscale DiscussionSPC2 hr
May 22, 7:39 PM EDTSpecial Weather StatementRAH51 min
May 22, 8:15 PM EDTSevere Thunderstorm WarningRAH45 min
Jun 3, 3:02 PM EDTMesoscale DiscussionSPC2 hr
Jun 4, 9:52 PM EDTSpecial Weather StatementRAH53 min
Jun 4, 11:15 PM EDTSpecial Weather StatementRAH60 min
Jun 5, 1:47 PM EDTMesoscale DiscussionSPC118 min
Jun 5, 3:48 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 7, 3:07 AM EDTSpecial Weather StatementRAH53 min
Jun 15, 1:40 PM EDTMesoscale DiscussionSPC95 min
Jun 15, 7:43 PM EDTSpecial Weather StatementRAH77 min
Jun 17, 1:02 AM EDTSpecial Weather StatementRAH58 min
Jun 22, 4:45 PM EDTMesoscale DiscussionSPC90 min
Jun 23, 3:52 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 23, 4:02 PM EDTSpecial Weather StatementRAH43 min
Jun 23, 4:26 PM EDTSevere Thunderstorm WarningRAH49 min
Jun 23, 5:02 PM EDTSpecial Weather StatementRAH58 min
Jun 23, 5:08 PM EDTSevere Thunderstorm WarningRAH67 min
Jun 23, 5:51 PM EDTTornado WarningRAH28 min
Jun 23, 8:35 PM EDTMesoscale DiscussionSPC115 min
Jun 23, 10:47 PM EDTSpecial Weather StatementRAH73 min
Jun 24, 8:33 PM EDTSpecial Weather StatementRAH57 min
Jun 24, 8:38 PM EDTSevere Thunderstorm WarningRAH37 min
Jun 24, 9:29 PM EDTSpecial Weather StatementRAH46 min
Jun 24, 10:58 PM EDTSpecial Weather StatementRAH47 min
Jun 24, 11:36 PM EDTSpecial Weather StatementRAH39 min
Jun 29, 5:36 PM EDTSpecial Weather StatementRAH39 min
Jun 29, 5:53 PM EDTSevere Thunderstorm WarningRAH52 min
Jun 30, 3:15 PM EDTMesoscale DiscussionSPC2 hr
Jul 2, 12:54 PM EDTMesoscale DiscussionSPC2 hr
Jul 3, 2:31 AM EDTSpecial Weather StatementRAH59 min
Jul 5, 2:10 PM EDTMesoscale DiscussionSPC2 hr
Jul 5, 4:46 PM EDTSevere Thunderstorm WatchSPC4 hr
Jul 5, 5:36 PM EDTSevere Thunderstorm WarningRAH22 min
Jul 7, 6:17 PM EDTSevere Thunderstorm WarningRAH41 min
Jul 8, 5:48 PM EDTMesoscale DiscussionSPC57 min
Jul 8, 6:15 PM EDTSevere Thunderstorm WatchSPC6 hr
Jul 8, 6:47 PM EDTSevere Thunderstorm WarningRAH58 min
Jul 8, 7:42 PM EDTSevere Thunderstorm WarningRAH78 min
Jul 8, 8:59 PM EDTSevere Thunderstorm WarningRAH39 min
Jul 12, 7:46 PM EDTSpecial Weather StatementRAH29 min
Jul 15, 1:28 PM EDTMesoscale DiscussionSPC2 hr
Jul 15, 6:26 PM EDTSevere Thunderstorm WarningRAH64 min
Jul 15, 7:12 PM EDTAreal Flood AdvisoryRAH3 hr
Jul 19, 11:14 PM EDTMesoscale DiscussionSPC91 min
Jul 26, 3:55 PM EDTHeat AdvisoryRAH28 hr
Jul 27, 1:45 PM EDTMesoscale DiscussionSPC2 hr
Jul 27, 3:42 PM EDTHeat AdvisoryRAH28 hr
Jul 27, 7:43 PM EDTSpecial Weather StatementRAH47 min
Jul 31, 3:34 PM EDTMesoscale DiscussionSPC116 min
Jul 31, 6:29 PM EDTSpecial Weather StatementRAH61 min
Jul 31, 7:31 PM EDTSpecial Weather StatementRAH59 min
Jul 31, 7:47 PM EDTAreal Flood AdvisoryRAH3 hr
Jul 31, 8:04 PM EDTSevere Thunderstorm WarningRAH41 min
Jul 31, 9:14 PM EDTAreal Flood AdvisoryRAH2 hr
Aug 2, 2:17 PM EDTAreal Flood AdvisoryRAH118 min
Aug 2, 7:21 PM EDTFlash Flood WarningRAH3 hr
Aug 7, 12:45 AM EDTSpecial Weather StatementRAH75 min
Aug 8, 1:43 AM EDTSpecial Weather StatementRAH92 min
Aug 17, 1:04 PM EDTMesoscale DiscussionSPC86 min
Aug 17, 6:08 PM EDTSpecial Weather StatementRAH37 min
Aug 21, 4:54 PM EDTSpecial Weather StatementRAH96 min
Aug 27, 3:25 PM EDTMesoscale DiscussionSPC95 min
Aug 27, 4:25 PM EDTSpecial Weather StatementRAH50 min
Sep 1, 2:15 PM EDTMesoscale DiscussionSPC60 min
Sep 19, 7:30 AM EDTSpecial Weather StatementRAH90 min
Sep 19, 9:14 AM EDTAreal Flood AdvisoryRAH2 hr
Sep 26, 8:16 PM EDTSpecial Weather StatementRAH89 min
Sep 27, 9:53 PM EDTSpecial Weather StatementRAH67 min
Sep 28, 2:44 PM EDTMesoscale DiscussionSPC91 min
Sep 28, 3:13 PM EDTSevere Thunderstorm WatchSPC7 hr
Sep 28, 4:41 PM EDTMesoscale DiscussionSPC2 hr
Sep 28, 5:48 PM EDTSevere Thunderstorm WarningRAH42 min
Sep 28, 6:29 PM EDTSevere Thunderstorm WarningRAH44 min
Sep 28, 6:58 PM EDTSpecial Weather StatementRAH62 min
Sep 28, 7:02 PM EDTMesoscale DiscussionSPC88 min
Sep 28, 7:38 PM EDTAreal Flood AdvisoryRAH3 hr
Sep 28, 8:15 PM EDTFlash Flood WarningRAH3 hr
Sep 28, 8:16 PM EDTSpecial Weather StatementRAH59 min
Sep 28, 9:26 PM EDTMesoscale DiscussionSPC64 min
Sep 30, 8:51 AM EDTSpecial Weather StatementRAH54 min
Oct 1, 6:29 AM EDTDense Fog AdvisoryRAH3 hr
Oct 6, 9:46 PM EDTFlash Flood WatchRAH53 hr
Oct 7, 3:05 PM EDTWind AdvisoryRAH51 hr
Oct 8, 1:21 PM EDTAreal Flood AdvisoryRAH8 hr
Oct 8, 2:32 PM EDTFlash Flood WarningRAH8 hr
Oct 8, 3:47 PM EDTRiver Flood WarningRAH37 hr
Nov 7, 2:01 PM ESTFrost AdvisoryRAH19 hr
Nov 11, 3:40 PM ESTFreeze WatchRAH22 hr
Nov 12, 1:55 PM ESTFreeze WarningRAH19 hr
Dec 16, 1:38 PM ESTFreezing Rain AdvisoryRAH19 hr
Dec 17, 1:43 AM ESTSpecial Weather StatementRAH77 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 archive20152017

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.