Alert archive / North Carolina / Johnston County

Weather alerts in Johnston County, North Carolina, 2011

241 weather alerts in 2011, 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 2011. Tap one for its archive.

Alerts: 241
Warnings: 54
Watches: 30
Advisories: 39
Busiest month: July51 alerts
Busiest day: April 16, 20119 alerts

Over time

By month

Warning verification

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

3 of 4 tornado warnings covering Johnston County in 2011 had a tornado report inside them; 9 of 10 tornado reports fell inside a warning, on average 29 minutes after it went out.

Johnston County, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	4	3	25%	10	90%	29 min
Severe thunderstorm warnings	38	26	32%	40	68%	18 min
Flash flood warnings	4	2	50%	0

Each office's whole area, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Raleigh, NC: tornado warnings	61	22	64%	87	93%	27 min
NWS Raleigh, NC: severe thunderstorm warnings	360	267	26%	788	83%	21 min
NWS Raleigh, NC: flash flood warnings	51	26	49%	77	88%	77 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 7, 3:05 AM EST	Winter Weather Advisory	RAH	19 hr
Jan 8, 8:02 PM EST	Winter Storm Watch	RAH	19 hr
Jan 9, 3:13 PM EST	Winter Storm Warning	RAH	44 hr
Jan 9, 3:13 PM EST	Winter Weather Advisory	RAH	68 hr
Jan 11, 10:19 AM EST	Special Weather Statement	RAH	116 min
Jan 26, 9:22 AM EST	Special Weather Statement	RAH	83 min
Feb 9, 12:06 PM EST	Winter Weather Advisory	RAH	21 hr
Feb 13, 2:12 PM EST	Fire Weather Watch	RAH	14 hr
Feb 14, 3:59 AM EST	Wind Advisory	RAH	14 hr
Feb 14, 4:12 AM EST	Red Flag Warning	RAH	17 hr
Feb 18, 10:12 AM EST	Fire Weather Watch	RAH	18 hr
Feb 19, 4:02 AM EST	Red Flag Warning	RAH	17 hr
Feb 24, 3:10 PM EST	Wind Advisory	RAH	27 hr
Feb 27, 3:27 PM EST	Wind Advisory	RAH	27 hr
Feb 28, 5:04 PM EST	Severe Thunderstorm Watch	SPC	5 hr
Feb 28, 6:42 PM EST	Mesoscale Discussion	SPC	93 min
Feb 28, 6:58 PM EST	Special Weather Statement	RAH	62 min
Feb 28, 7:01 PM EST	Special Weather Statement	RAH	29 min
Mar 1, 1:24 AM EST	Special Weather Statement	RAH	66 min
Mar 6, 11:23 AM EST	Severe Thunderstorm Warning	RAH	43 min
Mar 6, 11:33 AM EST	Tornado Warning	RAH	33 min
Mar 6, 12:06 PM EST	Mesoscale Discussion	SPC	84 min
Mar 6, 3:49 PM EST	Mesoscale Discussion	SPC	86 min
Mar 6, 4:23 PM EST	Special Weather Statement	RAH	52 min
Mar 6, 5:11 PM EST	Special Weather Statement	RAH	64 min
Mar 10, 12:51 PM EST	Mesoscale Discussion	SPC	114 min
Mar 10, 1:25 PM EST	Severe Thunderstorm Watch	SPC	7 hr
Mar 10, 2:49 PM EST	Special Weather Statement	RAH	56 min
Mar 10, 3:26 PM EST	Special Weather Statement	RAH	64 min
Mar 10, 4:06 PM EST	Special Weather Statement	RAH	54 min
Mar 22, 3:44 PM EDT	Fire Weather Watch	RAH	12 hr
Mar 23, 4:04 AM EDT	Red Flag Warning	RAH	16 hr
Mar 23, 11:38 PM EDT	Special Weather Statement	RAH	52 min
Mar 24, 12:40 AM EDT	Special Weather Statement	RAH	65 min
Mar 27, 4:16 PM EDT	Freeze Watch	RAH	23 hr
Mar 28, 2:46 PM EDT	Freeze Warning	RAH	17 hr
Apr 1, 2:54 PM EDT	Wind Advisory	RAH	27 hr
Apr 2, 3:50 AM EDT	Frost Advisory	RAH	28 hr
Apr 4, 9:19 AM EDT	Wind Advisory	RAH	20 hr
Apr 5, 12:48 AM EDT	Tornado Watch	SPC	5 hr
Apr 5, 3:34 AM EDT	Mesoscale Discussion	SPC	116 min
Apr 5, 4:08 AM EDT	Severe Thunderstorm Warning	RAH	37 min
Apr 5, 4:25 AM EDT	Severe Thunderstorm Warning	RAH	65 min
Apr 5, 4:36 AM EDT	Severe Thunderstorm Warning	RAH	54 min
Apr 5, 7:06 AM EDT	Frost Advisory	RAH	26 hr
Apr 5, 8:25 AM EDT	Special Weather Statement	RAH	95 min
Apr 5, 9:33 AM EDT	Severe Thunderstorm Warning	RAH	87 min
Apr 8, 9:10 PM EDT	Mesoscale Discussion	SPC	65 min
Apr 8, 11:15 PM EDT	Special Weather Statement	RAH	75 min
Apr 16, 10:39 AM EDT	Mesoscale Discussion	SPC	2 hr
Apr 16, 12:02 PM EDT	Tornado Watch PDS	SPC	11 hr
Apr 16, 12:16 PM EDT	Mesoscale Discussion	SPC	59 min
Apr 16, 2:28 PM EDT	Mesoscale Discussion	SPC	92 min
Apr 16, 3:38 PM EDT	Areal Flood Advisory	RAH	3 hr
Apr 16, 3:59 PM EDT	Tornado Warning Emergency	RAH	46 min
Apr 16, 4:15 PM EDT	Tornado Warning Emergency	RAH	45 min
Apr 16, 4:49 PM EDT	Mesoscale Discussion	SPC	86 min
Apr 16, 4:53 PM EDT	Tornado Warning Emergency	RAH	52 min
Apr 26, 2:16 PM EDT	Mesoscale Discussion	SPC	59 min
Apr 27, 12:51 PM EDT	Mesoscale Discussion	SPC	84 min
Apr 27, 1:23 PM EDT	Tornado Watch	SPC	5 hr
Apr 28, 4:30 AM EDT	Tornado Watch	SPC	10 hr
Apr 28, 5:35 AM EDT	High Wind Warning	RAH	8 hr
Apr 28, 8:05 AM EDT	Mesoscale Discussion	SPC	85 min
Apr 28, 9:13 AM EDT	Special Weather Statement	RAH	62 min
Apr 28, 11:22 AM EDT	Mesoscale Discussion	SPC	53 min
Apr 28, 2:16 PM EDT	Areal Flood Advisory	RAH	104 min
May 7, 1:16 AM EDT	Dense Fog Advisory	RAH	8 hr
May 13, 7:21 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
May 13, 8:34 PM EDT	Severe Thunderstorm Warning	RAH	56 min
May 14, 1:25 AM EDT	Severe Thunderstorm Warning	RAH	50 min
May 14, 2:06 AM EDT	Severe Thunderstorm Warning	RAH	39 min
May 14, 2:28 AM EDT	Areal Flood Advisory	RAH	97 min
May 14, 1:44 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
May 14, 3:38 PM EDT	Severe Thunderstorm Warning	RAH	37 min
May 14, 4:03 PM EDT	Severe Thunderstorm Warning	RAH	42 min
May 14, 4:21 PM EDT	Mesoscale Discussion	SPC	84 min
May 14, 7:32 PM EDT	Mesoscale Discussion	SPC	58 min
May 23, 7:02 PM EDT	Mesoscale Discussion	SPC	58 min
May 24, 12:42 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
May 24, 8:40 PM EDT	Mesoscale Discussion	SPC	65 min
May 27, 11:26 AM EDT	Mesoscale Discussion	SPC	94 min
May 27, 12:06 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
May 27, 2:55 PM EDT	Severe Thunderstorm Warning	RAH	44 min
May 27, 3:29 PM EDT	Mesoscale Discussion	SPC	91 min
May 27, 6:24 PM EDT	Mesoscale Discussion	SPC	66 min
May 28, 1:01 PM EDT	Special Weather Statement	RAH	119 min
Jun 10, 9:07 PM EDT	Special Weather Statement	RAH	38 min
Jun 10, 9:51 PM EDT	Areal Flood Advisory	RAH	3 hr
Jun 11, 8:25 PM EDT	Special Weather Statement	RAH	65 min
Jun 12, 5:38 PM EDT	Mesoscale Discussion	SPC	67 min
Jun 12, 8:53 PM EDT	Special Weather Statement	RAH	52 min
Jun 18, 5:46 PM EDT	Mesoscale Discussion	SPC	59 min
Jun 18, 7:06 PM EDT	Severe Thunderstorm Warning	RAH	54 min
Jun 19, 11:32 PM EDT	Special Weather Statement	RAH	58 min
Jun 19, 11:35 PM EDT	Severe Thunderstorm Warning	RAH	55 min
Jun 20, 1:54 AM EDT	Special Weather Statement	RAH	66 min
Jun 21, 7:17 PM EDT	Special Weather Statement	RAH	43 min
Jun 21, 7:26 PM EDT	Severe Thunderstorm Warning	RAH	49 min
Jun 21, 8:02 PM EDT	Severe Thunderstorm Warning	RAH	43 min
Jun 22, 12:45 AM EDT	Severe Thunderstorm Warning	RAH	25 min
Jun 22, 6:42 PM EDT	Special Weather Statement	RAH	63 min
Jun 22, 7:43 PM EDT	Special Weather Statement	RAH	62 min
Jun 23, 1:40 PM EDT	Mesoscale Discussion	SPC	3 hr
Jun 23, 2:36 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 23, 4:13 PM EDT	Severe Thunderstorm Warning	RAH	62 min
Jun 24, 1:05 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 27, 1:03 AM EDT	Special Weather Statement	RAH	87 min
Jun 27, 1:15 PM EDT	Mesoscale Discussion	SPC	60 min
Jun 27, 1:34 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 27, 2:14 PM EDT	Severe Thunderstorm Warning	RAH	61 min
Jun 27, 2:49 PM EDT	Severe Thunderstorm Warning	RAH	56 min
Jun 27, 3:20 PM EDT	Special Weather Statement	RAH	55 min
Jun 27, 4:07 PM EDT	Mesoscale Discussion	SPC	83 min
Jun 28, 2:44 PM EDT	Mesoscale Discussion	SPC	91 min
Jun 28, 5:13 PM EDT	Special Weather Statement	RAH	62 min
Jun 28, 6:28 PM EDT	Severe Thunderstorm Warning	RAH	62 min
Jul 4, 2:34 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 4, 6:44 PM EDT	Mesoscale Discussion	SPC	61 min
Jul 5, 7:56 PM EDT	Special Weather Statement	RAH	64 min
Jul 5, 9:01 PM EDT	Special Weather Statement	RAH	59 min
Jul 6, 12:53 PM EDT	Mesoscale Discussion	SPC	97 min
Jul 6, 6:07 PM EDT	Severe Thunderstorm Warning	RAH	38 min
Jul 6, 6:23 PM EDT	Severe Thunderstorm Warning	RAH	29 min
Jul 6, 6:25 PM EDT	Severe Thunderstorm Warning	RAH	31 min
Jul 6, 6:45 PM EDT	Areal Flood Advisory	RAH	92 min
Jul 7, 7:21 PM EDT	Special Weather Statement	RAH	24 min
Jul 8, 1:01 PM EDT	Mesoscale Discussion	SPC	89 min
Jul 11, 3:28 PM EDT	Heat Advisory	RAH	30 hr
Jul 12, 6:48 PM EDT	Mesoscale Discussion	SPC	57 min
Jul 12, 9:11 PM EDT	Heat Advisory	RAH	22 hr
Jul 13, 1:43 PM EDT	Mesoscale Discussion	SPC	92 min
Jul 13, 2:21 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 13, 4:30 PM EDT	Mesoscale Discussion	SPC	90 min
Jul 13, 6:04 PM EDT	Special Weather Statement	RAH	56 min
Jul 13, 6:27 PM EDT	Special Weather Statement	RAH	63 min
Jul 13, 6:28 PM EDT	Special Weather Statement	RAH	62 min
Jul 13, 7:36 PM EDT	Mesoscale Discussion	SPC	54 min
Jul 19, 3:15 PM EDT	Heat Advisory	RAH	30 hr
Jul 19, 6:46 PM EDT	Special Weather Statement	RAH	29 min
Jul 20, 3:43 PM EDT	Excessive Heat Watch	RAH	23 hr
Jul 20, 3:43 PM EDT	Heat Advisory	RAH	28 hr
Jul 20, 6:25 PM EDT	Special Weather Statement	RAH	50 min
Jul 20, 6:55 PM EDT	Special Weather Statement	RAH	20 min
Jul 21, 2:59 PM EDT	Excessive Heat Watch	RAH	7 hr
Jul 21, 2:59 PM EDT	Excessive Heat Warning	RAH	53 hr
Jul 21, 4:02 PM EDT	Special Weather Statement	RAH	28 min
Jul 23, 2:16 PM EDT	Special Weather Statement	RAH	59 min
Jul 23, 2:29 PM EDT	Severe Thunderstorm Warning	RAH	46 min
Jul 23, 2:43 PM EDT	Heat Advisory	RAH	28 hr
Jul 23, 2:59 PM EDT	Severe Thunderstorm Warning	RAH	46 min
Jul 23, 3:15 PM EDT	Severe Thunderstorm Warning	RAH	45 min
Jul 23, 4:44 PM EDT	Severe Thunderstorm Warning	RAH	26 min
Jul 23, 6:17 PM EDT	Mesoscale Discussion	SPC	88 min
Jul 23, 6:41 PM EDT	Severe Thunderstorm Warning	RAH	32 min
Jul 24, 4:04 PM EDT	Severe Thunderstorm Warning	RAH	41 min
Jul 24, 6:34 PM EDT	Mesoscale Discussion	SPC	116 min
Jul 25, 4:06 AM EDT	Heat Advisory	RAH	15 hr
Jul 25, 4:57 PM EDT	Severe Thunderstorm Warning	RAH	63 min
Jul 25, 7:23 PM EDT	Mesoscale Discussion	SPC	67 min
Jul 28, 4:20 AM EDT	Excessive Heat Watch	RAH	34 hr
Jul 28, 4:20 AM EDT	Heat Advisory	RAH	17 hr
Jul 29, 4:05 AM EDT	Heat Advisory	RAH	17 hr
Jul 29, 2:24 PM EDT	Heat Advisory	RAH	31 hr
Jul 30, 2:49 PM EDT	Mesoscale Discussion	SPC	86 min
Jul 31, 1:12 PM EDT	Special Weather Statement	RAH	48 min
Jul 31, 1:22 PM EDT	Mesoscale Discussion	SPC	83 min
Jul 31, 3:36 PM EDT	Special Weather Statement	RAH	39 min
Aug 3, 10:33 AM EDT	Heat Advisory	RAH	9 hr
Aug 3, 2:52 PM EDT	Heat Advisory	RAH	29 hr
Aug 6, 5:49 PM EDT	Mesoscale Discussion	SPC	116 min
Aug 7, 3:39 AM EDT	Heat Advisory	RAH	16 hr
Aug 7, 12:52 PM EDT	Mesoscale Discussion	SPC	53 min
Aug 7, 3:29 PM EDT	Heat Advisory	RAH	27 hr
Aug 12, 11:22 AM EDT	Severe Thunderstorm Warning	RAH	53 min
Aug 12, 11:53 AM EDT	Areal Flood Advisory	RAH	2 hr
Aug 12, 12:38 PM EDT	Flash Flood Warning	RAH	85 min
Aug 12, 1:46 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 13, 1:33 PM EDT	Mesoscale Discussion	SPC	117 min
Aug 13, 1:43 PM EDT	Special Weather Statement	RAH	47 min
Aug 13, 1:46 PM EDT	Areal Flood Advisory	RAH	104 min
Aug 14, 6:37 PM EDT	Mesoscale Discussion	SPC	53 min
Aug 14, 10:05 PM EDT	Special Weather Statement	RAH	55 min
Aug 14, 10:43 PM EDT	Severe Thunderstorm Warning	RAH	62 min
Aug 21, 1:45 PM EDT	Mesoscale Discussion	SPC	90 min
Aug 21, 4:10 PM EDT	Special Weather Statement	RAH	65 min
Aug 21, 4:17 PM EDT	Severe Thunderstorm Warning	RAH	58 min
Aug 21, 8:36 PM EDT	Flash Flood Warning	RAH	4 hr
Aug 21, 9:30 PM EDT	Special Weather Statement	RAH	60 min
Aug 25, 3:31 PM EDT	Flash Flood Watch	RAH	53 hr
Aug 26, 4:08 AM EDT	High Wind Watch	RAH	8 hr
Aug 26, 12:25 PM EDT	High Wind Warning	RAH	33 hr
Aug 26, 5:46 PM EDT	Special Weather Statement	RAH	59 min
Aug 26, 11:06 PM EDT	Mesoscale Discussion	SPC	84 min
Aug 27, 2:26 AM EDT	Areal Flood Advisory	RAH	4 hr
Aug 27, 6:01 AM EDT	Flash Flood Warning	RAH	6 hr
Aug 27, 11:55 AM EDT	Flash Flood Warning	RAH	8 hr
Aug 29, 11:08 AM EDT	Mesoscale Discussion	SPC	97 min
Aug 29, 2:13 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 29, 3:28 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 29, 5:14 PM EDT	Severe Thunderstorm Warning	RAH	24 min
Aug 29, 7:53 PM EDT	Mesoscale Discussion	SPC	67 min
Aug 29, 8:50 PM EDT	Special Weather Statement	RAH	55 min
Sep 5, 3:57 AM EDT	Flash Flood Watch	RAH	50 hr
Sep 5, 5:11 PM EDT	Special Weather Statement	RAH	64 min
Sep 5, 5:48 PM EDT	Mesoscale Discussion	SPC	87 min
Sep 6, 5:17 AM EDT	Tornado Watch	SPC	9 hr
Sep 6, 8:35 AM EDT	Mesoscale Discussion	SPC	85 min
Sep 6, 12:41 PM EDT	Mesoscale Discussion	SPC	64 min
Sep 6, 1:32 PM EDT	Tornado Watch	SPC	7 hr
Sep 6, 2:17 PM EDT	Special Weather Statement	RAH	58 min
Sep 6, 2:29 PM EDT	Severe Thunderstorm Warning	RAH	46 min
Sep 6, 3:01 PM EDT	Severe Thunderstorm Warning	RAH	44 min
Sep 6, 4:41 PM EDT	Mesoscale Discussion	SPC	64 min
Sep 6, 7:33 PM EDT	Mesoscale Discussion	SPC	117 min
Sep 7, 2:26 AM EDT	Areal Flood Advisory	RAH	3 hr
Sep 7, 3:52 AM EDT	Areal Flood Advisory	RAH	3 hr
Sep 12, 2:31 PM EDT	Mesoscale Discussion	SPC	89 min
Sep 23, 1:47 PM EDT	Areal Flood Advisory	RAH	2 hr
Sep 24, 3:35 AM EDT	Dense Fog Advisory	RAH	6 hr
Sep 29, 12:34 AM EDT	Special Weather Statement	RAH	56 min
Sep 29, 2:48 AM EDT	Special Weather Statement	RAH	57 min
Sep 30, 1:39 PM EDT	Mesoscale Discussion	SPC	3 hr
Sep 30, 5:32 PM EDT	Mesoscale Discussion	SPC	88 min
Sep 30, 5:49 PM EDT	Special Weather Statement	RAH	56 min
Sep 30, 6:45 PM EDT	Special Weather Statement	RAH	60 min
Oct 19, 6:26 PM EDT	Mesoscale Discussion	SPC	2 hr
Oct 19, 6:48 PM EDT	Special Weather Statement	RAH	57 min
Oct 29, 4:11 AM EDT	Frost Advisory	RAH	29 hr
Nov 9, 3:36 AM EST	Dense Fog Advisory	RAH	5 hr
Nov 16, 4:06 PM EST	Mesoscale Discussion	SPC	114 min
Nov 16, 4:30 PM EST	Tornado Watch	SPC	7 hr
Nov 16, 6:48 PM EST	Mesoscale Discussion	SPC	87 min
Nov 22, 3:52 AM EST	Dense Fog Advisory	RAH	5 hr
Nov 23, 4:02 AM EST	Special Weather Statement	RAH	58 min
Dec 7, 4:56 PM EST	Mesoscale Discussion	SPC	94 min
Dec 7, 5:22 PM EST	Severe Thunderstorm Warning	RAH	53 min
Dec 7, 5:42 PM EST	Mesoscale Discussion	SPC	33 min
Dec 7, 5:56 PM EST	Severe Thunderstorm Watch	SPC	4 hr
Dec 7, 6:06 PM EST	Severe Thunderstorm Warning	RAH	39 min
Dec 27, 11:48 AM EST	Special Weather Statement	RAH	2 hr

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	38
Tornado Warning	4
Severe Thunderstorm Watch	12
Tornado Watch	7
Mesoscale Discussion	63
Special Weather Statement	55
Flooding
Flash Flood Warning	4
Flash Flood Watch	2
Areal Flood Advisory	11
Winter
Winter Storm Warning	1
Winter Storm Watch	1
Winter Weather Advisory	3
Heat
Excessive Heat Warning	1
Excessive Heat Watch	3
Heat Advisory	13
Cold
Freeze Warning	1
Freeze Watch	1
Frost Advisory	3
Wind and dust
High Wind Warning	2
High Wind Watch	1
Wind Advisory	5
Fire
Red Flag Warning	3
Fire Weather Watch	3
Fog and smoke
Dense Fog Advisory	4

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2010 2012

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.