Alert archive / North Carolina / Durham County

Weather alerts in Durham County, North Carolina, 2017

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

Durham County and its neighbors

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

Alerts
123
Warnings
21
Watches
12
Advisories
27
Busiest month
April21 alerts
Busiest day
April 6, 20176 alerts

Over time

By month

Warning verification

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

Durham County, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings141214%1580%9 min
Flash flood warnings110%0

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Raleigh, NC: tornado warnings18194%450%20 min
NWS Raleigh, NC: severe thunderstorm warnings21113536%41889%21 min
NWS Raleigh, NC: flash flood warnings211243%3187%63 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, 8:29 AM ESTWinter Storm WatchRAH20 hr
Jan 5, 3:42 PM ESTWinter Storm WarningRAH48 hr
Jan 7, 2:35 AM ESTSpecial Weather StatementRAH85 min
Jan 7, 3:18 AM ESTMesoscale DiscussionSPC5 hr
Jan 7, 3:17 PM ESTWinter Weather AdvisoryRAH69 hr
Jan 8, 4:02 AM ESTWind Chill AdvisoryRAH6 hr
Jan 11, 7:32 AM ESTSpecial Weather StatementRAH73 min
Jan 21, 12:17 AM ESTDense Fog AdvisoryRAH10 hr
Jan 21, 10:54 PM ESTDense Fog AdvisoryRAH7 hr
Feb 8, 10:57 PM ESTSpecial Weather StatementRAH48 min
Feb 9, 3:05 AM ESTSpecial Weather StatementRAH40 min
Feb 12, 3:29 PM ESTMesoscale DiscussionSPC3 hr
Mar 1, 3:02 PM ESTSevere Thunderstorm WatchSPC7 hr
Mar 1, 6:21 PM ESTMesoscale DiscussionSPC114 min
Mar 1, 7:24 PM ESTSpecial Weather StatementRAH36 min
Mar 18, 3:26 PM EDTMesoscale DiscussionSPC3 hr
Mar 18, 6:42 PM EDTSpecial Weather StatementRAH63 min
Mar 18, 6:43 PM EDTSpecial Weather StatementRAH62 min
Mar 28, 1:58 PM EDTMesoscale DiscussionSPC3 hr
Mar 31, 8:10 AM EDTSpecial Weather StatementRAH80 min
Mar 31, 2:08 PM EDTMesoscale DiscussionSPC67 min
Apr 3, 6:13 PM EDTSpecial Weather StatementRAH47 min
Apr 3, 6:41 PM EDTMesoscale DiscussionSPC64 min
Apr 5, 2:53 PM EDTWind AdvisoryRAH31 hr
Apr 6, 12:51 AM EDTMesoscale DiscussionSPC114 min
Apr 6, 5:59 AM EDTMesoscale DiscussionSPC91 min
Apr 6, 7:06 AM EDTTornado WatchSPC8 hr
Apr 6, 7:21 AM EDTSpecial Weather StatementRAH39 min
Apr 6, 7:31 AM EDTSevere Thunderstorm WarningRAH44 min
Apr 6, 3:53 PM EDTWind AdvisoryRAH26 hr
Apr 7, 9:32 PM EDTFrost AdvisoryRAH11 hr
Apr 20, 3:53 AM EDTDense Fog AdvisoryRAH5 hr
Apr 21, 4:19 PM EDTMesoscale DiscussionSPC56 min
Apr 21, 4:31 PM EDTSpecial Weather StatementRAH59 min
Apr 22, 3:17 PM EDTSevere Thunderstorm WatchSPC4 hr
Apr 22, 4:11 PM EDTFlood WatchRAH64 hr
Apr 22, 4:12 PM EDTMesoscale DiscussionSPC2 hr
Apr 24, 9:56 AM EDTAreal Flood AdvisoryRAH3 hr
Apr 24, 3:33 PM EDTAreal Flood AdvisoryRAH4 hr
Apr 24, 6:19 PM EDTAreal Flood WarningRAH17 hr
Apr 24, 9:50 PM EDTAreal Flood WarningRAH14 hr
Apr 25, 11:39 AM EDTAreal Flood WarningRAH24 hr
May 1, 5:54 PM EDTSevere Thunderstorm WatchSPC5 hr
May 1, 8:28 PM EDTMesoscale DiscussionSPC92 min
May 5, 12:11 AM EDTSpecial Weather StatementRAH49 min
May 5, 2:28 AM EDTMesoscale DiscussionSPC92 min
May 5, 3:09 AM EDTTornado WatchSPC6 hr
May 5, 4:29 AM EDTSevere Thunderstorm WarningRAH61 min
May 11, 4:47 PM EDTMesoscale DiscussionSPC2 hr
May 11, 7:46 PM EDTSevere Thunderstorm WatchSPC3 hr
May 11, 8:54 PM EDTSpecial Weather StatementRAH66 min
May 11, 9:04 PM EDTSevere Thunderstorm WarningRAH56 min
May 19, 2:24 PM EDTMesoscale DiscussionSPC2 hr
May 19, 5:30 PM EDTSpecial Weather StatementRAH45 min
May 22, 11:09 PM EDTAreal Flood AdvisoryRAH111 min
May 23, 3:41 AM EDTFlood WatchRAH41 hr
May 24, 3:13 PM EDTMesoscale DiscussionSPC2 hr
May 24, 3:46 PM EDTTornado WatchSPC6 hr
May 25, 3:17 AM EDTSpecial Weather StatementRAH28 min
May 25, 12:10 PM EDTSpecial Weather StatementRAH80 min
May 25, 12:50 PM EDTSevere Thunderstorm WarningRAH40 min
May 25, 1:53 PM EDTSpecial Weather StatementRAH67 min
May 25, 5:35 PM EDTSevere Thunderstorm WarningRAH21 min
Jun 4, 3:15 PM EDTMesoscale DiscussionSPC90 min
Jun 4, 5:23 PM EDTSevere Thunderstorm WarningRAH29 min
Jun 14, 1:17 PM EDTMesoscale DiscussionSPC2 hr
Jun 16, 8:50 AM EDTSpecial Weather StatementRAH55 min
Jun 16, 9:48 AM EDTSpecial Weather StatementRAH57 min
Jun 16, 1:27 PM EDTMesoscale DiscussionSPC3 hr
Jun 16, 6:51 PM EDTSpecial Weather StatementRAH54 min
Jun 16, 7:12 PM EDTSpecial Weather StatementRAH63 min
Jun 16, 7:34 PM EDTSpecial Weather StatementRAH56 min
Jun 17, 1:56 PM EDTSpecial Weather StatementRAH49 min
Jun 19, 4:40 PM EDTSpecial Weather StatementRAH50 min
Jun 19, 6:43 PM EDTMesoscale DiscussionSPC2 hr
Jun 19, 8:55 PM EDTAreal Flood AdvisoryRAH6 hr
Jun 19, 9:30 PM EDTSevere Thunderstorm WarningRAH60 min
Jun 19, 11:39 PM EDTFlash Flood WarningRAH4 hr
Jun 20, 3:03 AM EDTAreal Flood WarningRAH3 hr
Jun 24, 1:14 AM EDTMesoscale DiscussionSPC2 hr
Jun 24, 2:50 AM EDTSpecial Weather StatementRAH40 min
Jun 24, 5:33 PM EDTSpecial Weather StatementRAH42 min
Jun 30, 1:02 PM EDTSpecial Weather StatementRAH73 min
Jul 4, 11:27 PM EDTAreal Flood AdvisoryRAH2 hr
Jul 5, 8:48 PM EDTSevere Thunderstorm WarningRAH42 min
Jul 5, 9:14 PM EDTSevere Thunderstorm WarningRAH61 min
Jul 8, 3:56 PM EDTSevere Thunderstorm WarningRAH34 min
Jul 8, 4:50 PM EDTMesoscale DiscussionSPC115 min
Jul 13, 6:37 PM EDTSpecial Weather StatementRAH53 min
Jul 17, 5:11 PM EDTSpecial Weather StatementRAH64 min
Jul 17, 5:14 PM EDTAreal Flood AdvisoryRAH2 hr
Jul 18, 4:57 PM EDTSpecial Weather StatementRAH63 min
Jul 18, 8:07 PM EDTSpecial Weather StatementRAH68 min
Jul 20, 9:27 PM EDTHeat AdvisoryRAH23 hr
Jul 21, 3:03 PM EDTHeat AdvisoryRAH52 hr
Jul 23, 11:36 AM EDTMesoscale DiscussionSPC2 hr
Jul 23, 5:26 PM EDTSevere Thunderstorm WarningRAH64 min
Jul 23, 6:23 PM EDTAreal Flood AdvisoryRAH3 hr
Jul 23, 6:34 PM EDTSevere Thunderstorm WarningRAH56 min
Jul 27, 8:34 PM EDTSpecial Weather StatementRAH56 min
Jul 28, 3:00 PM EDTMesoscale DiscussionSPC90 min
Aug 12, 12:16 AM EDTAreal Flood AdvisoryRAH3 hr
Aug 13, 4:40 AM EDTAreal Flood AdvisoryRAH4 hr
Aug 18, 3:49 AM EDTHeat AdvisoryRAH14 hr
Aug 23, 1:23 PM EDTMesoscale DiscussionSPC3 hr
Aug 23, 1:49 PM EDTSpecial Weather StatementRAH41 min
Sep 1, 4:32 PM EDTSpecial Weather StatementRAH58 min
Sep 1, 4:44 PM EDTMesoscale DiscussionSPC91 min
Sep 1, 5:19 PM EDTSevere Thunderstorm WarningRAH41 min
Sep 1, 5:38 PM EDTSevere Thunderstorm WarningRAH67 min
Sep 1, 5:42 PM EDTAreal Flood AdvisoryRAH3 hr
Sep 21, 3:33 PM EDTSpecial Weather StatementRAH57 min
Oct 15, 5:21 AM EDTDense Fog AdvisoryRAH6 hr
Oct 23, 5:40 PM EDTTornado WatchSPC8 hr
Oct 23, 7:34 PM EDTMesoscale DiscussionSPC116 min
Oct 23, 8:53 PM EDTSpecial Weather StatementRAH82 min
Oct 23, 9:42 PM EDTAreal Flood AdvisoryRAH2 hr
Nov 6, 2:52 AM ESTDense Fog AdvisoryRAH6 hr
Nov 9, 2:55 PM ESTFreeze WatchRAH12 hr
Nov 10, 2:30 AM ESTFreeze WarningRAH31 hr
Dec 5, 9:00 AM ESTDense Fog AdvisoryRAH2 hr
Dec 8, 4:17 AM ESTWinter Weather AdvisoryRAH35 hr
Dec 9, 3:24 PM ESTWinter Weather AdvisoryRAH19 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.