Alert archive / North Carolina / Halifax County

Weather alerts in Halifax County, North Carolina, 2009

138 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Halifax County and its neighbors

Each county as a circle sized by its count in 2009. Tap one for its archive.

Alerts
138
Warnings
42
Watches
23
Advisories
32
Busiest month
May28 alerts
Busiest day
June 9, 20098 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 1 tornado warnings covering Halifax County in 2009 had a tornado report inside them.

Halifax County, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings10100%0
Severe thunderstorm warnings291452%1080%22 min
Flash flood warnings5340%475%54 min

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Raleigh, NC: tornado warnings24963%1894%21 min
NWS Raleigh, NC: severe thunderstorm warnings33318146%35688%23 min
NWS Raleigh, NC: flash flood warnings412051%5684%66 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 2, 9:10 AM ESTWinter Weather AdvisoryRAH2 hr
Jan 6, 11:34 PM ESTDense Fog AdvisoryRAH6 hr
Jan 7, 3:38 AM ESTWind AdvisoryRAH18 hr
Jan 7, 9:23 AM ESTSevere Thunderstorm WarningRAH37 min
Jan 7, 5:18 PM ESTHigh Wind WarningRAH115 min
Jan 18, 9:37 PM ESTDense Fog AdvisoryRAH11 hr
Jan 19, 3:59 AM ESTWinter Storm WatchRAH11 hr
Jan 19, 2:31 PM ESTWinter Storm WarningRAH25 hr
Jan 20, 3:34 PM ESTWinter Weather AdvisoryRAH17 hr
Jan 21, 1:20 PM ESTWinter Weather AdvisoryRAH20 hr
Jan 28, 5:13 PM ESTSevere Thunderstorm WarningRAH47 min
Jan 28, 5:59 PM ESTSevere Thunderstorm WarningRAH28 min
Feb 3, 12:30 PM ESTWinter Storm WarningRAH17 hr
Feb 3, 12:30 PM ESTWinter Weather AdvisoryRAH20 hr
Feb 11, 10:22 AM ESTFire Weather WatchRAH19 hr
Feb 12, 5:36 AM ESTRed Flag WarningRAH14 hr
Mar 1, 4:25 AM ESTWinter Weather AdvisoryRAH26 hr
Mar 2, 11:02 AM ESTWinter Weather AdvisoryRAH22 hr
Mar 18, 3:17 AM EDTDense Fog AdvisoryRAH9 hr
Apr 3, 4:10 AM EDTWind AdvisoryRAH16 hr
Apr 6, 8:03 AM EDTTornado WatchSPC7 hr
Apr 6, 10:08 AM EDTSevere Thunderstorm WarningRAH22 min
Apr 6, 10:10 AM EDTTornado WarningRAH32 min
Apr 6, 10:33 AM EDTMesoscale DiscussionSPC57 min
Apr 6, 3:47 PM EDTFreeze WatchRAH24 hr
Apr 7, 3:30 PM EDTFreeze WarningRAH16 hr
Apr 12, 6:44 PM EDTFrost AdvisoryRAH7 hr
Apr 16, 3:30 PM EDTFrost AdvisoryRAH18 hr
Apr 20, 12:22 PM EDTMesoscale DiscussionSPC83 min
Apr 20, 2:09 PM EDTMesoscale DiscussionSPC2 hr
Apr 20, 2:50 PM EDTTornado WatchSPC7 hr
Apr 20, 3:57 PM EDTSevere Thunderstorm WarningRAH17 min
Apr 20, 4:48 PM EDTSevere Thunderstorm WarningRAH62 min
Apr 20, 4:57 PM EDTMesoscale DiscussionSPC93 min
Apr 20, 7:15 PM EDTMesoscale DiscussionSPC90 min
Apr 22, 10:01 AM EDTRed Flag WarningRAH8 hr
May 1, 1:03 PM EDTMesoscale DiscussionSPC117 min
May 4, 1:15 PM EDTMesoscale DiscussionSPC60 min
May 4, 1:30 PM EDTSevere Thunderstorm WatchSPC9 hr
May 4, 6:15 PM EDTMesoscale DiscussionSPC60 min
May 4, 9:08 PM EDTMesoscale DiscussionSPC97 min
May 5, 5:45 PM EDTTornado WatchSPC5 hr
May 5, 7:10 PM EDTMesoscale DiscussionSPC65 min
May 5, 8:43 PM EDTMesoscale DiscussionSPC62 min
May 6, 11:40 AM EDTMesoscale DiscussionSPC2 hr
May 6, 2:16 PM EDTTornado WatchSPC6 hr
May 6, 4:10 PM EDTSevere Thunderstorm WarningRAH40 min
May 6, 5:10 PM EDTSevere Thunderstorm WarningRAH50 min
May 6, 7:29 PM EDTMesoscale DiscussionSPC91 min
May 6, 8:26 PM EDTTornado WatchSPC8 hr
May 6, 10:50 PM EDTMesoscale DiscussionSPC55 min
May 7, 12:10 AM EDTMesoscale DiscussionSPC95 min
May 7, 5:17 AM EDTMesoscale DiscussionSPC118 min
May 7, 3:03 PM EDTMesoscale DiscussionSPC117 min
May 9, 12:51 AM EDTMesoscale DiscussionSPC84 min
May 9, 5:58 PM EDTMesoscale DiscussionSPC62 min
May 9, 6:25 PM EDTSevere Thunderstorm WatchSPC4 hr
May 9, 7:14 PM EDTSevere Thunderstorm WarningRAH61 min
May 28, 3:49 PM EDTMesoscale DiscussionSPC56 min
May 29, 2:22 PM EDTMesoscale DiscussionSPC23 min
May 29, 2:41 PM EDTSevere Thunderstorm WatchSPC8 hr
May 29, 5:35 PM EDTSevere Thunderstorm WarningRAH19 min
May 29, 6:01 PM EDTMesoscale DiscussionSPC59 min
May 31, 2:48 PM EDTMesoscale DiscussionSPC117 min
Jun 4, 2:52 PM EDTTornado WatchSPC4 hr
Jun 8, 5:03 AM EDTDense Fog AdvisoryRAH4 hr
Jun 9, 2:31 PM EDTMesoscale DiscussionSPC89 min
Jun 9, 3:36 PM EDTSevere Thunderstorm WarningRAH20 min
Jun 9, 4:18 PM EDTSevere Thunderstorm WarningRAH57 min
Jun 9, 4:43 PM EDTAreal Flood AdvisoryRAH3 hr
Jun 9, 4:59 PM EDTFlash Flood WarningRAH3 hr
Jun 9, 5:16 PM EDTSevere Thunderstorm WarningRAH59 min
Jun 9, 5:42 PM EDTFlash Flood WarningRAH3 hr
Jun 9, 6:18 PM EDTSevere Thunderstorm WarningRAH57 min
Jun 11, 6:20 PM EDTSevere Thunderstorm WatchSPC4 hr
Jun 11, 8:24 PM EDTMesoscale DiscussionSPC66 min
Jun 12, 4:49 PM EDTSevere Thunderstorm WatchSPC6 hr
Jul 12, 12:21 PM EDTMesoscale DiscussionSPC54 min
Jul 17, 9:52 AM EDTMesoscale DiscussionSPC83 min
Jul 17, 2:14 PM EDTSevere Thunderstorm WarningRAH46 min
Jul 17, 2:42 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 17, 3:26 PM EDTSevere Thunderstorm WarningRAH46 min
Jul 17, 9:07 PM EDTSevere Thunderstorm WarningRAH53 min
Jul 17, 9:15 PM EDTMesoscale DiscussionSPC60 min
Jul 17, 9:54 PM EDTSevere Thunderstorm WarningRAH32 min
Jul 20, 3:32 AM EDTSevere Thunderstorm WarningRAH43 min
Jul 24, 4:01 AM EDTAreal Flood AdvisoryRAH118 min
Jul 26, 9:42 PM EDTSevere Thunderstorm WarningRAH48 min
Jul 27, 11:58 AM EDTMesoscale DiscussionSPC92 min
Jul 27, 12:49 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 27, 3:45 PM EDTMesoscale DiscussionSPC60 min
Jul 27, 3:59 PM EDTSevere Thunderstorm WarningRAH46 min
Jul 27, 5:09 PM EDTSevere Thunderstorm WarningRAH36 min
Jul 27, 5:51 PM EDTSevere Thunderstorm WarningRAH41 min
Jul 27, 6:34 PM EDTAreal Flood AdvisoryRAH79 min
Jul 29, 1:32 PM EDTMesoscale DiscussionSPC28 min
Jul 29, 8:00 PM EDTSevere Thunderstorm WarningRAH45 min
Jul 31, 2:25 PM EDTSevere Thunderstorm WatchSPC6 hr
Jul 31, 4:47 PM EDTMesoscale DiscussionSPC88 min
Jul 31, 6:05 PM EDTSevere Thunderstorm WarningRAH43 min
Jul 31, 6:54 PM EDTMesoscale DiscussionSPC66 min
Jul 31, 6:58 PM EDTAreal Flood AdvisoryRAH112 min
Aug 2, 11:33 AM EDTMesoscale DiscussionSPC2 hr
Aug 5, 6:12 PM EDTAreal Flood AdvisoryRAH3 hr
Aug 5, 6:35 PM EDTFlash Flood WarningRAH91 min
Aug 9, 2:47 PM EDTHeat AdvisoryRAH29 hr
Aug 11, 3:21 PM EDTSevere Thunderstorm WatchSPC7 hr
Aug 11, 6:54 PM EDTSevere Thunderstorm WarningRAH51 min
Aug 11, 7:19 PM EDTSevere Thunderstorm WarningRAH56 min
Aug 12, 11:25 AM EDTMesoscale DiscussionSPC2 hr
Aug 12, 12:23 PM EDTSevere Thunderstorm WatchSPC9 hr
Aug 12, 4:13 PM EDTMesoscale DiscussionSPC92 min
Aug 13, 8:48 PM EDTAreal Flood AdvisoryRAH92 min
Aug 22, 11:58 AM EDTMesoscale DiscussionSPC2 hr
Sep 28, 4:44 PM EDTMesoscale DiscussionSPC61 min
Sep 28, 5:47 PM EDTSevere Thunderstorm WatchSPC4 hr
Sep 28, 7:49 PM EDTSevere Thunderstorm WarningRAH41 min
Sep 28, 8:27 PM EDTSevere Thunderstorm WarningRAH18 min
Oct 19, 2:05 AM EDTFrost AdvisoryRAH31 hr
Oct 24, 12:19 PM EDTMesoscale DiscussionSPC116 min
Nov 5, 2:52 PM ESTFrost AdvisoryRAH18 hr
Nov 6, 3:23 AM ESTFreeze WatchRAH6 hr
Nov 6, 9:03 AM ESTFreeze WarningRAH24 hr
Nov 10, 2:35 PM ESTFlash Flood WatchRAH54 hr
Nov 11, 3:37 AM ESTWind AdvisoryRAH50 hr
Nov 12, 8:32 AM ESTAreal Flood AdvisoryRAH6 hr
Nov 12, 9:51 AM ESTFlash Flood WarningRAH4 hr
Nov 12, 1:51 PM ESTFlash Flood WarningRAH3 hr
Nov 15, 9:16 PM ESTDense Fog AdvisoryRAH12 hr
Nov 19, 9:39 PM ESTDense Fog AdvisoryRAH8 hr
Nov 26, 1:36 AM ESTDense Fog AdvisoryRAH8 hr
Dec 2, 6:59 PM ESTTornado Watch PDSSPC8 hr
Dec 2, 8:31 PM ESTMesoscale DiscussionSPC89 min
Dec 3, 12:12 AM ESTMesoscale DiscussionSPC93 min
Dec 8, 9:10 PM ESTWind AdvisoryRAH24 hr
Dec 13, 7:54 PM ESTDense Fog AdvisoryRAH16 hr
Dec 15, 4:23 AM ESTDense Fog AdvisoryRAH6 hr
Dec 17, 4:25 PM ESTWinter Weather AdvisoryRAH44 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 archive20082010

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.