Alert archive / North Carolina / Johnston County

Weather alerts in Johnston County, North Carolina, 2012

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

Johnston County and its neighbors

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

Alerts
222
Warnings
56
Watches
25
Advisories
37
Busiest month
July62 alerts
Busiest day
September 18, 201210 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 Johnston County in 2012 had a tornado report inside them.

Johnston County, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings20100%0
Severe thunderstorm warnings503530%3594%29 min
Flash flood warnings00

Each office's whole area, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Raleigh, NC: tornado warnings19289%450%5 min
NWS Raleigh, NC: severe thunderstorm warnings36727226%70688%25 min
NWS Raleigh, NC: flash flood warnings492843%8387%59 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, 8:18 PM ESTSpecial Weather StatementRAH57 min
Jan 9, 10:15 PM ESTDense Fog AdvisoryRAH10 hr
Jan 23, 9:40 AM ESTDense Fog AdvisoryRAH2 hr
Jan 27, 6:45 AM ESTSpecial Weather StatementRAH60 min
Jan 27, 7:31 AM ESTSpecial Weather StatementRAH59 min
Feb 16, 10:25 PM ESTDense Fog AdvisoryRAH11 hr
Feb 19, 9:29 PM ESTSpecial Weather StatementRAH12 hr
Feb 20, 4:46 AM ESTSpecial Weather StatementRAH4 hr
Feb 23, 12:25 AM ESTMesoscale DiscussionSPC95 min
Feb 23, 1:22 AM ESTSevere Thunderstorm WarningRAH38 min
Feb 24, 12:43 PM ESTMesoscale DiscussionSPC92 min
Feb 24, 1:19 PM ESTTornado WatchSPC7 hr
Feb 24, 4:45 PM ESTMesoscale DiscussionSPC90 min
Feb 24, 7:22 PM ESTSpecial Weather StatementRAH53 min
Feb 24, 8:08 PM ESTSpecial Weather StatementRAH52 min
Feb 25, 6:17 AM ESTRed Flag WarningRAH12 hr
Feb 28, 1:02 AM ESTDense Fog AdvisoryRAH7 hr
Feb 29, 11:14 PM ESTSpecial Weather StatementRAH31 min
Feb 29, 11:46 PM ESTSpecial Weather StatementRAH29 min
Mar 1, 3:21 AM ESTMesoscale DiscussionSPC54 min
Mar 3, 3:58 AM ESTMesoscale DiscussionSPC92 min
Mar 3, 4:39 AM ESTSevere Thunderstorm WatchSPC4 hr
Mar 14, 6:38 AM EDTDense Fog AdvisoryRAH3 hr
Mar 19, 6:13 AM EDTDense Fog AdvisoryRAH3 hr
Mar 21, 8:58 AM EDTAreal Flood AdvisoryRAH109 min
Mar 21, 1:22 PM EDTMesoscale DiscussionSPC113 min
Mar 21, 7:30 PM EDTSpecial Weather StatementRAH60 min
Mar 21, 8:20 PM EDTAreal Flood AdvisoryRAH3 hr
Mar 23, 4:30 AM EDTDense Fog AdvisoryRAH5 hr
Mar 24, 2:43 PM EDTSpecial Weather StatementRAH47 min
Mar 24, 3:38 PM EDTTornado WatchSPC7 hr
Mar 24, 5:24 PM EDTSpecial Weather StatementRAH81 min
Mar 24, 7:34 PM EDTMesoscale DiscussionSPC116 min
Mar 24, 10:23 PM EDTMesoscale DiscussionSPC97 min
Mar 25, 12:31 PM EDTMesoscale DiscussionSPC2 hr
Mar 25, 6:03 PM EDTSpecial Weather StatementRAH57 min
Mar 27, 4:22 AM EDTFrost AdvisoryRAH27 hr
Apr 1, 12:32 AM EDTSpecial Weather StatementRAH58 min
Apr 4, 1:31 PM EDTMesoscale DiscussionSPC89 min
Apr 4, 2:27 PM EDTSevere Thunderstorm WatchSPC6 hr
Apr 4, 11:33 PM EDTSpecial Weather StatementRAH57 min
Apr 6, 3:26 PM EDTFrost AdvisoryRAH17 hr
Apr 9, 10:03 AM EDTFire Weather WatchRAH18 hr
Apr 10, 3:55 AM EDTRed Flag WarningRAH16 hr
Apr 10, 3:45 PM EDTFreeze WatchRAH19 hr
Apr 11, 11:06 AM EDTFrost AdvisoryRAH21 hr
Apr 22, 6:32 AM EDTAreal Flood AdvisoryRAH3 hr
Apr 24, 11:49 PM EDTSpecial Weather StatementRAH56 min
May 1, 3:12 PM EDTSevere Thunderstorm WatchSPC5 hr
May 4, 6:31 PM EDTSevere Thunderstorm WarningRAH44 min
May 4, 6:58 PM EDTSevere Thunderstorm WarningRAH47 min
May 5, 1:30 PM EDTMesoscale DiscussionSPC2 hr
May 5, 1:59 PM EDTSevere Thunderstorm WarningRAH46 min
May 5, 2:38 PM EDTSevere Thunderstorm WatchSPC7 hr
May 5, 6:20 PM EDTMesoscale DiscussionSPC55 min
May 5, 6:26 PM EDTSpecial Weather StatementRAH64 min
May 5, 6:53 PM EDTSevere Thunderstorm WarningRAH67 min
May 5, 7:44 PM EDTAreal Flood AdvisoryRAH80 min
May 14, 3:36 PM EDTSevere Thunderstorm WarningRAH39 min
May 14, 4:23 PM EDTSpecial Weather StatementRAH67 min
May 15, 3:13 PM EDTSevere Thunderstorm WatchSPC7 hr
May 15, 4:44 PM EDTSevere Thunderstorm WarningRAH46 min
May 15, 5:25 PM EDTSpecial Weather StatementRAH65 min
May 15, 6:30 PM EDTMesoscale DiscussionSPC90 min
May 15, 6:35 PM EDTSpecial Weather StatementRAH40 min
May 15, 8:42 PM EDTMesoscale DiscussionSPC63 min
May 17, 6:48 AM EDTDense Fog AdvisoryRAH2 hr
May 22, 2:29 PM EDTMesoscale DiscussionSPC91 min
May 22, 3:33 PM EDTSevere Thunderstorm WarningRAH42 min
May 22, 4:18 PM EDTSevere Thunderstorm WarningRAH42 min
May 22, 4:49 PM EDTSevere Thunderstorm WarningRAH56 min
May 23, 1:15 PM EDTMesoscale DiscussionSPC60 min
May 23, 1:44 PM EDTSevere Thunderstorm WatchSPC7 hr
May 23, 2:00 PM EDTSevere Thunderstorm WarningRAH45 min
May 23, 2:44 PM EDTSevere Thunderstorm WarningRAH46 min
May 23, 3:29 PM EDTSevere Thunderstorm WarningRAH46 min
May 23, 4:07 PM EDTSevere Thunderstorm WarningRAH38 min
May 23, 4:54 PM EDTMesoscale DiscussionSPC66 min
May 23, 7:32 PM EDTMesoscale DiscussionSPC58 min
May 28, 2:17 PM EDTSpecial Weather StatementRAH73 min
May 28, 3:26 PM EDTSpecial Weather StatementRAH49 min
May 29, 3:54 AM EDTFlash Flood WatchRAH35 hr
May 29, 1:03 PM EDTSpecial Weather StatementRAH42 min
May 29, 6:55 PM EDTSpecial Weather StatementRAH50 min
Jun 1, 1:54 PM EDTMesoscale DiscussionSPC66 min
Jun 1, 2:13 PM EDTSevere Thunderstorm WatchSPC8 hr
Jun 1, 4:04 PM EDTSevere Thunderstorm WarningRAH45 min
Jun 1, 4:31 PM EDTMesoscale DiscussionSPC59 min
Jun 1, 4:44 PM EDTSevere Thunderstorm WarningRAH61 min
Jun 1, 7:33 PM EDTSpecial Weather StatementRAH57 min
Jun 1, 7:42 PM EDTMesoscale DiscussionSPC2 hr
Jun 1, 7:47 PM EDTSevere Thunderstorm WarningRAH35 min
Jun 11, 6:05 PM EDTSpecial Weather StatementRAH40 min
Jun 22, 2:29 PM EDTSpecial Weather StatementRAH61 min
Jun 22, 4:10 PM EDTMesoscale DiscussionSPC2 hr
Jun 22, 5:19 PM EDTSpecial Weather StatementRAH56 min
Jun 25, 5:21 PM EDTMesoscale DiscussionSPC24 min
Jun 25, 5:34 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 25, 7:44 PM EDTMesoscale DiscussionSPC61 min
Jun 25, 9:10 PM EDTSevere Thunderstorm WarningRAH65 min
Jun 25, 9:50 PM EDTMesoscale DiscussionSPC55 min
Jun 25, 11:05 PM EDTSevere Thunderstorm WarningRAH70 min
Jun 28, 4:29 AM EDTExcessive Heat WatchRAH24 hr
Jun 28, 1:04 PM EDTHeat AdvisoryRAH41 hr
Jun 29, 4:22 AM EDTExcessive Heat WarningRAH61 hr
Jun 29, 11:15 PM EDTSevere Thunderstorm WarningRAH75 min
Jun 29, 11:44 PM EDTSevere Thunderstorm WarningRAH61 min
Jun 30, 3:19 PM EDTExcessive Heat WatchRAH26 hr
Jul 1, 12:56 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 1, 2:37 PM EDTSevere Thunderstorm WarningRAH21 min
Jul 1, 2:53 PM EDTMesoscale DiscussionSPC97 min
Jul 1, 3:03 PM EDTSevere Thunderstorm WarningRAH57 min
Jul 1, 3:48 PM EDTSevere Thunderstorm WarningRAH57 min
Jul 1, 4:59 PM EDTHeat AdvisoryRAH22 hr
Jul 1, 7:04 PM EDTMesoscale DiscussionSPC56 min
Jul 3, 6:23 PM EDTMesoscale DiscussionSPC3 hr
Jul 3, 9:43 PM EDTSpecial Weather StatementRAH62 min
Jul 4, 3:47 PM EDTHeat AdvisoryRAH29 hr
Jul 4, 5:05 PM EDTSevere Thunderstorm WarningRAH40 min
Jul 5, 3:37 AM EDTHeat AdvisoryRAH40 hr
Jul 5, 1:40 PM EDTMesoscale DiscussionSPC95 min
Jul 5, 4:08 PM EDTSevere Thunderstorm WarningRAH67 min
Jul 5, 5:15 PM EDTSevere Thunderstorm WarningRAH40 min
Jul 6, 4:07 AM EDTHeat AdvisoryRAH40 hr
Jul 6, 5:35 PM EDTSevere Thunderstorm WarningRAH33 min
Jul 7, 4:06 AM EDTExcessive Heat WatchRAH12 hr
Jul 7, 3:50 PM EDTHeat AdvisoryRAH29 hr
Jul 9, 3:41 AM EDTHeat AdvisoryRAH15 hr
Jul 9, 1:36 PM EDTMesoscale DiscussionSPC54 min
Jul 9, 2:49 PM EDTSevere Thunderstorm WarningRAH41 min
Jul 9, 2:59 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 9, 3:37 PM EDTSpecial Weather StatementRAH53 min
Jul 9, 4:10 PM EDTAreal Flood AdvisoryRAH79 min
Jul 9, 4:48 PM EDTMesoscale DiscussionSPC87 min
Jul 11, 2:09 PM EDTSpecial Weather StatementRAH51 min
Jul 11, 3:25 PM EDTSpecial Weather StatementRAH50 min
Jul 13, 3:04 PM EDTSpecial Weather StatementRAH56 min
Jul 14, 5:26 PM EDTSpecial Weather StatementRAH49 min
Jul 16, 12:58 PM EDTMesoscale DiscussionSPC62 min
Jul 16, 3:34 PM EDTSpecial Weather StatementRAH41 min
Jul 20, 1:29 PM EDTSpecial Weather StatementRAH61 min
Jul 20, 2:47 PM EDTMesoscale DiscussionSPC2 hr
Jul 21, 2:17 PM EDTMesoscale DiscussionSPC2 hr
Jul 21, 2:45 PM EDTSpecial Weather StatementRAH30 min
Jul 21, 3:40 PM EDTSevere Thunderstorm WarningRAH65 min
Jul 21, 3:50 PM EDTSpecial Weather StatementRAH55 min
Jul 22, 3:16 AM EDTAreal Flood AdvisoryRAH2 hr
Jul 22, 2:20 PM EDTMesoscale DiscussionSPC2 hr
Jul 22, 3:28 PM EDTSevere Thunderstorm WarningRAH32 min
Jul 22, 6:53 PM EDTSpecial Weather StatementRAH67 min
Jul 22, 7:32 PM EDTSevere Thunderstorm WarningRAH30 min
Jul 23, 12:58 PM EDTMesoscale DiscussionSPC3 hr
Jul 23, 6:55 PM EDTSevere Thunderstorm WarningRAH65 min
Jul 23, 7:31 PM EDTSevere Thunderstorm WarningRAH59 min
Jul 23, 8:07 PM EDTSevere Thunderstorm WarningRAH83 min
Jul 23, 8:53 PM EDTAreal Flood AdvisoryRAH86 min
Jul 24, 2:36 PM EDTSevere Thunderstorm WatchSPC5 hr
Jul 24, 3:46 PM EDTSevere Thunderstorm WarningRAH47 min
Jul 24, 3:46 PM EDTMesoscale DiscussionSPC89 min
Jul 24, 4:11 PM EDTSevere Thunderstorm WarningRAH64 min
Jul 25, 3:30 PM EDTHeat AdvisoryRAH28 hr
Jul 26, 3:44 PM EDTHeat AdvisoryRAH27 hr
Jul 27, 1:54 PM EDTSevere Thunderstorm WatchSPC8 hr
Jul 27, 7:50 PM EDTMesoscale DiscussionSPC85 min
Jul 28, 2:18 PM EDTMesoscale DiscussionSPC117 min
Jul 28, 9:47 PM EDTSevere Thunderstorm WarningRAH58 min
Jul 30, 1:48 PM EDTSpecial Weather StatementRAH57 min
Jul 30, 2:50 PM EDTSpecial Weather StatementRAH55 min
Jul 30, 4:13 PM EDTAreal Flood AdvisoryRAH107 min
Jul 31, 5:57 AM EDTDense Fog AdvisoryRAH4 hr
Aug 1, 5:19 PM EDTSevere Thunderstorm WarningRAH56 min
Aug 1, 5:59 PM EDTSevere Thunderstorm WarningRAH12 min
Aug 2, 1:34 PM EDTSevere Thunderstorm WarningRAH56 min
Aug 2, 2:08 PM EDTAreal Flood AdvisoryRAH112 min
Aug 2, 2:46 PM EDTSpecial Weather StatementRAH44 min
Aug 8, 7:21 PM EDTSevere Thunderstorm WarningRAH54 min
Aug 11, 1:27 PM EDTMesoscale DiscussionSPC63 min
Aug 11, 4:07 PM EDTSpecial Weather StatementRAH83 min
Aug 11, 4:36 PM EDTSevere Thunderstorm WarningRAH69 min
Aug 15, 2:01 PM EDTMesoscale DiscussionSPC89 min
Aug 15, 2:34 PM EDTSevere Thunderstorm WatchSPC6 hr
Aug 15, 5:01 PM EDTSevere Thunderstorm WarningRAH25 min
Aug 18, 7:13 PM EDTSpecial Weather StatementRAH47 min
Aug 18, 7:20 PM EDTSpecial Weather StatementRAH40 min
Aug 18, 7:37 PM EDTSevere Thunderstorm WarningRAH53 min
Aug 19, 10:33 AM EDTSevere Thunderstorm WatchSPC7 hr
Aug 29, 9:48 PM EDTSpecial Weather StatementRAH42 min
Aug 30, 6:51 AM EDTDense Fog AdvisoryRAH3 hr
Aug 31, 3:56 AM EDTDense Fog AdvisoryRAH5 hr
Sep 2, 1:37 PM EDTSpecial Weather StatementRAH83 min
Sep 6, 4:30 PM EDTSevere Thunderstorm WarningRAH60 min
Sep 6, 5:34 PM EDTSpecial Weather StatementRAH56 min
Sep 6, 5:40 PM EDTSevere Thunderstorm WarningRAH52 min
Sep 8, 1:48 PM EDTSevere Thunderstorm WatchSPC7 hr
Sep 8, 3:25 PM EDTMesoscale DiscussionSPC65 min
Sep 8, 3:41 PM EDTSpecial Weather StatementRAH49 min
Sep 8, 7:10 PM EDTMesoscale DiscussionSPC65 min
Sep 8, 8:05 PM EDTSevere Thunderstorm WarningRAH40 min
Sep 18, 8:49 AM EDTMesoscale DiscussionSPC116 min
Sep 18, 9:45 AM EDTTornado WatchSPC8 hr
Sep 18, 11:19 AM EDTMesoscale DiscussionSPC86 min
Sep 18, 1:21 PM EDTMesoscale DiscussionSPC84 min
Sep 18, 2:40 PM EDTSpecial Weather StatementRAH65 min
Sep 18, 2:51 PM EDTSevere Thunderstorm WarningRAH54 min
Sep 18, 3:19 PM EDTSevere Thunderstorm WarningRAH41 min
Sep 18, 3:24 PM EDTTornado WarningRAH23 min
Sep 18, 3:52 PM EDTSpecial Weather StatementRAH53 min
Sep 18, 4:11 PM EDTMesoscale DiscussionSPC94 min
Oct 2, 11:16 AM EDTSpecial Weather StatementRAH59 min
Oct 8, 2:05 PM EDTAreal Flood AdvisoryRAH2 hr
Oct 15, 2:39 PM EDTMesoscale DiscussionSPC66 min
Oct 18, 8:55 PM EDTMesoscale DiscussionSPC2 hr
Oct 31, 3:58 AM EDTFrost AdvisoryRAH28 hr
Nov 1, 3:56 AM EDTFrost AdvisoryRAH11 hr
Nov 1, 3:24 PM EDTFreeze WarningRAH17 hr
Dec 4, 2:37 AM ESTDense Fog AdvisoryRAH6 hr
Dec 18, 12:07 PM ESTSpecial Weather StatementRAH23 min
Dec 20, 2:44 PM ESTWind AdvisoryRAH28 hr
Dec 26, 8:07 AM ESTMesoscale DiscussionSPC83 min
Dec 26, 10:08 AM ESTTornado WatchSPC6 hr
Dec 26, 1:31 PM ESTTornado WarningRAH26 min
Dec 26, 2:20 PM ESTMesoscale DiscussionSPC85 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.