Alert archive / North Carolina / Durham County

Weather alerts in Durham County, North Carolina, 2020

150 weather alerts in 2020, 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 2020. Tap one for its archive.

Alerts: 150
Warnings: 34
Watches: 11
Advisories: 43
Busiest month: April26 alerts
Busiest day: June 11, 20207 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 Durham County in 2020 had a tornado report inside them.

Durham County, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	2	1	50%	0
Severe thunderstorm warnings	17	14	18%	8	100%	23 min
Flash flood warnings	5	4	20%	9	89%	111 min

Each office's whole area, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Raleigh, NC: tornado warnings	32	5	84%	9	78%	6 min
NWS Raleigh, NC: severe thunderstorm warnings	164	104	37%	380	82%	26 min
NWS Raleigh, NC: flash flood warnings	61	40	34%	175	85%	130 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.

Issued	Product	Office	Lasted
Jan 4, 4:43 PM EST	Special Weather Statement	RAH	62 min
Jan 11, 9:35 PM EST	Severe Thunderstorm Watch	SPC	4 hr
Jan 11, 10:59 PM EST	Mesoscale Discussion	SPC	91 min
Jan 11, 11:11 PM EST	Severe Thunderstorm Warning	RAH	79 min
Jan 14, 2:08 AM EST	Special Weather Statement	RAH	67 min
Jan 24, 8:25 PM EST	Special Weather Statement	RAH	50 min
Jan 24, 11:53 PM EST	Special Weather Statement	RAH	52 min
Feb 5, 3:09 PM EST	Flood Watch	RAH	34 hr
Feb 6, 12:41 PM EST	Tornado Watch	SPC	6 hr
Feb 6, 12:52 PM EST	Tornado Warning	RAH	23 min
Feb 6, 12:59 PM EST	Severe Thunderstorm Warning	RAH	46 min
Feb 6, 1:48 PM EST	Severe Thunderstorm Warning	RAH	57 min
Feb 6, 2:02 PM EST	Areal Flood Warning	RAH	6 hr
Feb 6, 7:54 PM EST	Areal Flood Warning	RAH	10 hr
Feb 6, 9:16 PM EST	Wind Advisory	RAH	19 hr
Feb 11, 7:51 AM EST	Special Weather Statement	RAH	84 min
Feb 19, 2:16 PM EST	Winter Weather Advisory	RAH	44 hr
Feb 20, 4:01 PM EST	Mesoscale Discussion	SPC	3 hr
Feb 21, 3:39 PM EST	Winter Weather Advisory	RAH	17 hr
Feb 25, 6:09 AM EST	Special Weather Statement	RAH	81 min
Feb 26, 3:31 AM EST	Dense Fog Advisory	RAH	5 hr
Feb 26, 9:04 AM EST	Dense Fog Advisory	RAH	116 min
Feb 26, 9:33 PM EST	Special Weather Statement	RAH	87 min
Mar 18, 4:25 AM EDT	Dense Fog Advisory	RAH	6 hr
Apr 6, 1:59 PM EDT	Mesoscale Discussion	SPC	2 hr
Apr 6, 2:33 PM EDT	Special Weather Statement	RAH	57 min
Apr 7, 4:32 AM EDT	Dense Fog Advisory	RAH	5 hr
Apr 7, 2:07 PM EDT	Mesoscale Discussion	SPC	53 min
Apr 8, 8:24 AM EDT	Special Weather Statement	RAH	51 min
Apr 8, 6:05 PM EDT	Severe Thunderstorm Warning	RAH	40 min
Apr 8, 6:06 PM EDT	Mesoscale Discussion	SPC	84 min
Apr 8, 6:39 PM EDT	Severe Thunderstorm Warning	RAH	51 min
Apr 8, 7:03 PM EDT	Severe Thunderstorm Warning	RAH	42 min
Apr 10, 10:49 AM EDT	Red Flag Warning	RAH	7 hr
Apr 10, 3:13 PM EDT	Freeze Warning	RAH	17 hr
Apr 12, 3:33 PM EDT	Wind Advisory	RAH	24 hr
Apr 13, 2:39 AM EDT	Mesoscale Discussion	SPC	96 min
Apr 13, 4:40 AM EDT	Mesoscale Discussion	SPC	95 min
Apr 13, 5:01 AM EDT	Tornado Watch	SPC	7 hr
Apr 13, 6:19 AM EDT	Severe Thunderstorm Warning	RAH	56 min
Apr 13, 6:32 AM EDT	Tornado Warning	RAH	28 min
Apr 13, 7:16 AM EDT	Special Weather Statement	RAH	59 min
Apr 15, 3:06 AM EDT	Frost Advisory	RAH	29 hr
Apr 16, 3:18 PM EDT	Frost Advisory	RAH	17 hr
Apr 18, 9:51 PM EDT	Frost Advisory	RAH	10 hr
Apr 26, 1:25 AM EDT	Mesoscale Discussion	SPC	3 hr
Apr 26, 7:29 PM EDT	Severe Thunderstorm Warning	RAH	46 min
Apr 26, 8:02 PM EDT	Severe Thunderstorm Warning	RAH	43 min
Apr 30, 5:30 AM EDT	Special Weather Statement	RAH	60 min
Apr 30, 6:04 AM EDT	Areal Flood Advisory	RAH	3 hr
May 9, 3:57 AM EDT	Freeze Warning	RAH	28 hr
May 19, 3:39 PM EDT	Flash Flood Watch	RAH	60 hr
May 21, 10:03 AM EDT	Areal Flood Advisory	RAH	3 hr
May 21, 8:18 PM EDT	Special Weather Statement	RAH	72 min
May 21, 9:30 PM EDT	Areal Flood Advisory	RAH	111 min
May 24, 1:44 PM EDT	Mesoscale Discussion	SPC	2 hr
May 28, 5:59 PM EDT	Special Weather Statement	RAH	61 min
May 29, 4:37 AM EDT	Special Weather Statement	RAH	53 min
May 29, 5:34 AM EDT	Special Weather Statement	RAH	56 min
May 29, 12:37 PM EDT	Mesoscale Discussion	SPC	113 min
Jun 10, 8:03 PM EDT	Special Weather Statement	RAH	57 min
Jun 11, 3:59 AM EDT	Flash Flood Watch	RAH	24 hr
Jun 11, 4:48 PM EDT	Special Weather Statement	RAH	57 min
Jun 11, 5:55 PM EDT	Special Weather Statement	RAH	65 min
Jun 11, 6:14 PM EDT	Areal Flood Advisory	RAH	3 hr
Jun 11, 6:31 PM EDT	Flash Flood Warning Considerable damage threat	RAH	3 hr
Jun 11, 7:29 PM EDT	Severe Thunderstorm Warning	RAH	46 min
Jun 15, 11:32 AM EDT	Areal Flood Advisory	RAH	6 hr
Jun 19, 5:02 PM EDT	Severe Thunderstorm Warning	RAH	43 min
Jun 19, 5:53 PM EDT	Areal Flood Advisory	RAH	2 hr
Jun 25, 5:48 PM EDT	Mesoscale Discussion	SPC	87 min
Jun 30, 5:31 PM EDT	Special Weather Statement	RAH	44 min
Jun 30, 5:53 PM EDT	Severe Thunderstorm Warning	RAH	52 min
Jul 1, 1:46 PM EDT	Mesoscale Discussion	SPC	119 min
Jul 5, 1:39 PM EDT	Special Weather Statement	RAH	66 min
Jul 5, 1:52 PM EDT	Severe Thunderstorm Warning	RAH	53 min
Jul 5, 2:49 PM EDT	Areal Flood Advisory	RAH	116 min
Jul 10, 10:40 PM EDT	Special Weather Statement	RAH	65 min
Jul 13, 1:21 PM EDT	Mesoscale Discussion	SPC	84 min
Jul 17, 1:47 PM EDT	Mesoscale Discussion	SPC	118 min
Jul 17, 4:05 PM EDT	Special Weather Statement	RAH	40 min
Jul 17, 4:33 PM EDT	Areal Flood Advisory	RAH	117 min
Jul 17, 4:42 PM EDT	Special Weather Statement	RAH	48 min
Jul 18, 3:18 PM EDT	Heat Advisory	RAH	30 hr
Jul 18, 6:24 PM EDT	Special Weather Statement	RAH	51 min
Jul 19, 2:59 PM EDT	Heat Advisory	RAH	30 hr
Jul 20, 3:23 PM EDT	Heat Advisory	RAH	30 hr
Jul 21, 1:00 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 21, 3:00 PM EDT	Heat Advisory	RAH	30 hr
Jul 23, 1:11 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 29, 2:45 PM EDT	Special Weather Statement	RAH	60 min
Aug 1, 12:32 AM EDT	Severe Thunderstorm Warning	RAH	43 min
Aug 1, 1:23 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 1, 5:23 PM EDT	Special Weather Statement	RAH	67 min
Aug 2, 4:06 AM EDT	Flash Flood Watch	RAH	52 hr
Aug 3, 4:18 PM EDT	Special Weather Statement	RAH	57 min
Aug 3, 6:14 PM EDT	Special Weather Statement	RAH	61 min
Aug 4, 3:29 AM EDT	Areal Flood Advisory	RAH	3 hr
Aug 6, 1:43 PM EDT	Special Weather Statement	RAH	62 min
Aug 6, 2:03 PM EDT	Severe Thunderstorm Warning	RAH	57 min
Aug 6, 2:08 PM EDT	Mesoscale Discussion	SPC	3 hr
Aug 10, 6:42 PM EDT	Special Weather Statement	RAH	48 min
Aug 10, 6:44 PM EDT	Areal Flood Advisory	RAH	79 min
Aug 10, 6:50 PM EDT	Flash Flood Warning Considerable damage threat	RAH	72 min
Aug 14, 8:48 PM EDT	Areal Flood Advisory	RAH	117 min
Aug 15, 3:56 AM EDT	Flash Flood Watch	RAH	18 hr
Aug 15, 4:32 PM EDT	Flash Flood Warning Considerable damage threat	RAH	3 hr
Aug 17, 4:17 PM EDT	Special Weather Statement	RAH	58 min
Aug 17, 5:17 PM EDT	Special Weather Statement	RAH	58 min
Aug 19, 6:11 PM EDT	Special Weather Statement	RAH	64 min
Aug 19, 6:56 PM EDT	Areal Flood Advisory	RAH	3 hr
Aug 21, 9:07 PM EDT	Areal Flood Advisory	RAH	3 hr
Aug 28, 7:50 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 31, 3:54 PM EDT	Mesoscale Discussion	SPC	96 min
Aug 31, 6:48 PM EDT	Flash Flood Warning Considerable damage threat	RAH	5 hr
Sep 2, 3:23 AM EDT	Heat Advisory	RAH	16 hr
Sep 3, 3:46 AM EDT	Heat Advisory	RAH	15 hr
Sep 11, 7:35 PM EDT	Areal Flood Advisory	RAH	2 hr
Sep 16, 4:19 AM EDT	Flash Flood Watch	RAH	47 hr
Sep 25, 7:21 PM EDT	Severe Thunderstorm Warning	RAH	39 min
Sep 25, 7:51 PM EDT	Severe Thunderstorm Warning	RAH	54 min
Sep 25, 9:17 PM EDT	Special Weather Statement	RAH	28 min
Sep 27, 3:21 AM EDT	Dense Fog Advisory	RAH	6 hr
Sep 28, 5:44 AM EDT	Dense Fog Advisory	RAH	4 hr
Sep 29, 2:36 PM EDT	Mesoscale Discussion	SPC	2 hr
Oct 19, 7:28 AM EDT	Dense Fog Advisory	RAH	3 hr
Oct 21, 4:36 AM EDT	Dense Fog Advisory	RAH	5 hr
Oct 26, 9:13 PM EDT	Dense Fog Advisory	RAH	13 hr
Oct 28, 2:26 PM EDT	Wind Advisory	RAH	26 hr
Oct 29, 10:21 AM EDT	High Wind Warning	RAH	6 hr
Oct 29, 10:45 PM EDT	Mesoscale Discussion	SPC	3 hr
Oct 30, 1:09 AM EDT	Special Weather Statement	RAH	66 min
Nov 1, 3:28 AM EST	Freeze Watch	RAH	12 hr
Nov 1, 3:35 PM EST	Freeze Warning	RAH	16 hr
Nov 2, 1:59 PM EST	Freeze Warning	RAH	18 hr
Nov 11, 3:08 AM EST	Flash Flood Watch	RAH	36 hr
Nov 12, 8:24 AM EST	Flash Flood Warning Considerable damage threat	RAH	8 hr
Nov 12, 4:08 PM EST	Areal Flood Warning	RAH	5 hr
Nov 12, 8:52 PM EST	Areal Flood Warning	RAH	19 hr
Nov 26, 8:46 PM EST	Dense Fog Advisory	RAH	12 hr
Nov 30, 3:37 AM EST	Wind Advisory	RAH	13 hr
Nov 30, 8:34 AM EST	Special Weather Statement	RAH	56 min
Nov 30, 11:36 AM EST	Special Weather Statement	RAH	39 min
Dec 4, 10:57 PM EST	Special Weather Statement	RAH	48 min
Dec 15, 3:54 AM EST	Winter Weather Advisory	RAH	36 hr
Dec 17, 2:57 AM EST	Dense Fog Advisory	RAH	7 hr
Dec 24, 8:47 PM EST	Areal Flood Advisory	RAH	3 hr
Dec 24, 10:35 PM EST	Special Weather Statement	RAH	85 min
Dec 24, 11:56 PM EST	Areal Flood Advisory	RAH	3 hr
Dec 25, 12:05 AM EST	Special Weather Statement	RAH	85 min

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

Product	Alerts
Severe storms
Severe Thunderstorm Warning	17
Tornado Warning	2
Severe Thunderstorm Watch	1
Tornado Watch	2
Mesoscale Discussion	22
Special Weather Statement	40
Flooding
Areal Flood Warning	4
Flash Flood Warning	5
Flash Flood Watch	6
Flood Watch	1
Areal Flood Advisory	16
Winter
Winter Weather Advisory	3
Heat
Heat Advisory	6
Cold
Freeze Warning	4
Freeze Watch	1
Frost Advisory	3
Wind and dust
High Wind Warning	1
Wind Advisory	4
Fire
Red Flag Warning	1
Fog and smoke
Dense Fog Advisory	11

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2019 2021

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.