Alert archive / North Carolina / Johnston County

Weather alerts in Johnston County, North Carolina, 2017

149 weather alerts in 2017, 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 2017. Tap one for its archive.

Alerts: 149
Warnings: 35
Watches: 13
Advisories: 26
Busiest month: July33 alerts
Busiest day: September 1, 201711 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 3 tornado warnings covering Johnston County in 2017 had a tornado report inside them.

Johnston County, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	3	0	100%	0
Severe thunderstorm warnings	20	16	20%	16	88%	18 min
Flash flood warnings	1	1	0%	2	50%	67 min

Each office's whole area, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Raleigh, NC: tornado warnings	18	1	94%	4	50%	20 min
NWS Raleigh, NC: severe thunderstorm warnings	211	135	36%	418	89%	21 min
NWS Raleigh, NC: flash flood warnings	21	12	43%	31	87%	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.

Issued	Product	Office	Lasted
Jan 5, 8:29 AM EST	Winter Storm Watch	RAH	20 hr
Jan 5, 3:42 PM EST	Winter Storm Warning	RAH	48 hr
Jan 7, 3:17 PM EST	Winter Weather Advisory	RAH	69 hr
Jan 11, 7:32 AM EST	Special Weather Statement	RAH	73 min
Jan 17, 3:46 AM EST	Dense Fog Advisory	RAH	6 hr
Jan 21, 12:17 AM EST	Dense Fog Advisory	RAH	10 hr
Jan 21, 10:06 AM EST	Dense Fog Advisory	RAH	54 min
Jan 21, 10:54 PM EST	Dense Fog Advisory	RAH	7 hr
Feb 8, 10:48 PM EST	Special Weather Statement	RAH	42 min
Feb 8, 11:34 PM EST	Special Weather Statement	RAH	56 min
Feb 9, 3:09 AM EST	Special Weather Statement	RAH	51 min
Feb 9, 4:02 AM EST	Special Weather Statement	RAH	43 min
Mar 1, 6:21 PM EST	Mesoscale Discussion	SPC	114 min
Mar 1, 9:43 PM EST	Special Weather Statement	RAH	62 min
Mar 28, 1:58 PM EDT	Mesoscale Discussion	SPC	3 hr
Mar 28, 4:42 PM EDT	Special Weather Statement	RAH	63 min
Mar 31, 9:57 AM EDT	Mesoscale Discussion	SPC	2 hr
Apr 3, 4:36 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
Apr 3, 6:41 PM EDT	Mesoscale Discussion	SPC	64 min
Apr 3, 6:53 PM EDT	Special Weather Statement	RAH	67 min
Apr 5, 2:53 PM EDT	Wind Advisory	RAH	31 hr
Apr 6, 5:59 AM EDT	Mesoscale Discussion	SPC	91 min
Apr 6, 7:06 AM EDT	Tornado Watch	SPC	8 hr
Apr 6, 8:26 AM EDT	Special Weather Statement	RAH	34 min
Apr 6, 8:26 AM EDT	Severe Thunderstorm Warning	RAH	49 min
Apr 6, 3:53 PM EDT	Wind Advisory	RAH	26 hr
Apr 22, 4:11 PM EDT	Flood Watch	RAH	64 hr
Apr 24, 3:33 PM EDT	Areal Flood Advisory	RAH	4 hr
Apr 24, 6:19 PM EDT	Areal Flood Warning	RAH	17 hr
Apr 24, 11:02 PM EDT	River Flood Warning	RAH	5 days
Apr 24, 11:02 PM EDT	River Flood Warning	RAH	61 hr
Apr 25, 11:39 AM EDT	Areal Flood Warning	RAH	24 hr
May 3, 12:37 PM EDT	River Flood Warning	RAH	10 days
May 3, 12:37 PM EDT	River Flood Warning	RAH	13 days
May 4, 8:49 PM EDT	Tornado Watch	SPC	6 hr
May 5, 2:28 AM EDT	Mesoscale Discussion	SPC	92 min
May 5, 3:09 AM EDT	Tornado Watch	SPC	6 hr
May 5, 5:19 AM EDT	Severe Thunderstorm Warning	RAH	41 min
May 11, 4:47 PM EDT	Mesoscale Discussion	SPC	2 hr
May 11, 7:46 PM EDT	Severe Thunderstorm Watch	SPC	3 hr
May 11, 9:51 PM EDT	Severe Thunderstorm Warning	RAH	37 min
May 11, 10:12 PM EDT	Mesoscale Discussion	SPC	63 min
May 22, 11:09 PM EDT	Areal Flood Advisory	RAH	111 min
May 23, 3:41 AM EDT	Flood Watch	RAH	41 hr
May 24, 3:13 PM EDT	Mesoscale Discussion	SPC	2 hr
May 24, 3:46 PM EDT	Tornado Watch	SPC	6 hr
May 24, 5:30 PM EDT	Tornado Warning	RAH	45 min
May 24, 6:16 PM EDT	Severe Thunderstorm Warning	RAH	38 min
May 25, 12:59 PM EDT	Mesoscale Discussion	SPC	61 min
May 25, 2:26 PM EDT	Special Weather Statement	RAH	64 min
May 31, 2:18 PM EDT	Special Weather Statement	RAH	57 min
May 31, 2:33 PM EDT	Mesoscale Discussion	SPC	117 min
Jun 4, 7:32 PM EDT	Special Weather Statement	RAH	43 min
Jun 4, 8:28 PM EDT	Special Weather Statement	RAH	47 min
Jun 5, 5:00 PM EDT	Special Weather Statement	RAH	60 min
Jun 14, 1:17 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 14, 7:43 PM EDT	Special Weather Statement	RAH	62 min
Jun 14, 8:13 PM EDT	Severe Thunderstorm Warning	RAH	31 min
Jun 14, 10:03 PM EDT	Special Weather Statement	RAH	57 min
Jun 16, 1:27 PM EDT	Mesoscale Discussion	SPC	3 hr
Jun 17, 1:56 PM EDT	Special Weather Statement	RAH	49 min
Jun 19, 1:03 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 19, 3:15 PM EDT	Special Weather Statement	RAH	45 min
Jun 19, 4:14 PM EDT	Special Weather Statement	RAH	61 min
Jun 19, 6:43 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 20, 6:14 AM EDT	Special Weather Statement	RAH	91 min
Jun 24, 1:14 AM EDT	Mesoscale Discussion	SPC	2 hr
Jun 24, 2:05 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 25, 4:45 AM EDT	River Flood Warning	RAH	27 hr
Jun 25, 5:45 AM EDT	River Flood Warning	RAH	48 hr
Jun 30, 1:02 PM EDT	Special Weather Statement	RAH	73 min
Jul 4, 6:53 PM EDT	Special Weather Statement	RAH	52 min
Jul 5, 8:05 PM EDT	Special Weather Statement	RAH	40 min
Jul 6, 9:10 PM EDT	Severe Thunderstorm Warning	RAH	52 min
Jul 7, 8:39 PM EDT	Special Weather Statement	RAH	66 min
Jul 8, 3:47 PM EDT	Special Weather Statement	RAH	58 min
Jul 8, 4:50 PM EDT	Mesoscale Discussion	SPC	115 min
Jul 8, 6:16 PM EDT	Severe Thunderstorm Warning	RAH	44 min
Jul 8, 6:58 PM EDT	Severe Thunderstorm Warning	RAH	62 min
Jul 8, 7:27 PM EDT	Areal Flood Advisory	RAH	3 hr
Jul 8, 7:48 PM EDT	Severe Thunderstorm Warning	RAH	42 min
Jul 8, 8:15 PM EDT	Severe Thunderstorm Warning	RAH	45 min
Jul 8, 8:27 PM EDT	Severe Thunderstorm Warning	RAH	48 min
Jul 8, 8:43 PM EDT	Severe Thunderstorm Warning	RAH	62 min
Jul 8, 8:47 PM EDT	Areal Flood Advisory	RAH	3 hr
Jul 12, 3:42 AM EDT	Heat Advisory	RAH	15 hr
Jul 12, 3:05 PM EDT	Special Weather Statement	RAH	40 min
Jul 13, 2:56 AM EDT	Heat Advisory	RAH	16 hr
Jul 13, 3:25 PM EDT	Special Weather Statement	RAH	50 min
Jul 14, 3:44 AM EDT	Heat Advisory	RAH	14 hr
Jul 14, 3:01 PM EDT	Special Weather Statement	RAH	44 min
Jul 14, 3:54 PM EDT	Areal Flood Advisory	RAH	3 hr
Jul 16, 2:11 AM EDT	Special Weather Statement	RAH	64 min
Jul 16, 4:02 PM EDT	Special Weather Statement	RAH	58 min
Jul 16, 5:23 PM EDT	Severe Thunderstorm Warning	RAH	11 min
Jul 20, 9:27 PM EDT	Heat Advisory	RAH	23 hr
Jul 21, 3:03 PM EDT	Heat Advisory	RAH	52 hr
Jul 21, 4:09 PM EDT	Special Weather Statement	RAH	66 min
Jul 21, 5:36 PM EDT	Special Weather Statement	RAH	54 min
Jul 22, 3:39 AM EDT	Excessive Heat Warning	RAH	39 hr
Jul 23, 11:36 AM EDT	Mesoscale Discussion	SPC	2 hr
Jul 23, 4:13 PM EDT	Special Weather Statement	RAH	62 min
Jul 23, 7:24 PM EDT	Severe Thunderstorm Warning	RAH	81 min
Jul 23, 7:39 PM EDT	Special Weather Statement	RAH	66 min
Aug 8, 6:45 AM EDT	Special Weather Statement	RAH	60 min
Aug 8, 7:39 AM EDT	Special Weather Statement	RAH	66 min
Aug 8, 4:35 PM EDT	Special Weather Statement	RAH	55 min
Aug 8, 5:34 PM EDT	Special Weather Statement	RAH	86 min
Aug 12, 5:23 AM EDT	Areal Flood Advisory	RAH	4 hr
Aug 15, 2:40 PM EDT	Special Weather Statement	RAH	35 min
Aug 15, 3:20 PM EDT	Special Weather Statement	RAH	40 min
Aug 15, 9:32 PM EDT	Special Weather Statement	RAH	73 min
Aug 17, 1:06 PM EDT	Heat Advisory	RAH	6 hr
Aug 17, 2:22 PM EDT	Severe Thunderstorm Warning	RAH	28 min
Aug 17, 3:27 PM EDT	Special Weather Statement	RAH	48 min
Aug 18, 3:49 AM EDT	Heat Advisory	RAH	14 hr
Aug 23, 1:23 PM EDT	Mesoscale Discussion	SPC	3 hr
Aug 23, 5:04 PM EDT	Special Weather Statement	RAH	56 min
Aug 23, 5:47 PM EDT	Areal Flood Advisory	RAH	3 hr
Aug 23, 5:52 PM EDT	Severe Thunderstorm Warning	RAH	68 min
Aug 28, 10:33 AM EDT	Flash Flood Watch	RAH	17 hr
Aug 28, 10:34 AM EDT	Wind Advisory	RAH	16 hr
Sep 1, 1:49 PM EDT	Tornado Watch	SPC	8 hr
Sep 1, 4:38 PM EDT	Severe Thunderstorm Warning	RAH	52 min
Sep 1, 4:44 PM EDT	Mesoscale Discussion	SPC	91 min
Sep 1, 5:02 PM EDT	Severe Thunderstorm Warning	RAH	43 min
Sep 1, 5:04 PM EDT	Tornado Warning Tornado observed	RAH	26 min
Sep 1, 5:27 PM EDT	Tornado Warning	RAH	48 min
Sep 1, 5:38 PM EDT	Severe Thunderstorm Warning	RAH	67 min
Sep 1, 5:46 PM EDT	Areal Flood Advisory	RAH	3 hr
Sep 1, 6:08 PM EDT	Flash Flood Warning	RAH	3 hr
Sep 1, 6:10 PM EDT	Severe Thunderstorm Warning	RAH	50 min
Sep 1, 7:23 PM EDT	Mesoscale Discussion	SPC	97 min
Sep 5, 11:02 PM EDT	Special Weather Statement	RAH	43 min
Sep 5, 11:35 PM EDT	Special Weather Statement	RAH	85 min
Sep 6, 1:29 PM EDT	Mesoscale Discussion	SPC	3 hr
Sep 21, 1:53 PM EDT	Special Weather Statement	RAH	67 min
Sep 21, 3:36 PM EDT	Special Weather Statement	RAH	54 min
Oct 10, 7:02 PM EDT	Special Weather Statement	RAH	58 min
Oct 23, 5:40 PM EDT	Tornado Watch	SPC	8 hr
Oct 23, 7:34 PM EDT	Mesoscale Discussion	SPC	116 min
Oct 23, 10:12 PM EDT	Special Weather Statement	RAH	93 min
Oct 23, 10:57 PM EDT	Mesoscale Discussion	SPC	2 hr
Oct 29, 1:53 AM EDT	Mesoscale Discussion	SPC	2 hr
Nov 6, 2:52 AM EST	Dense Fog Advisory	RAH	6 hr
Nov 9, 2:55 PM EST	Freeze Watch	RAH	12 hr
Nov 10, 2:30 AM EST	Freeze Warning	RAH	31 hr
Dec 5, 9:00 AM EST	Dense Fog Advisory	RAH	2 hr
Dec 26, 3:48 PM EST	Winter Weather Advisory	RAH	18 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	20
Tornado Warning	3
Severe Thunderstorm Watch	2
Tornado Watch	6
Mesoscale Discussion	26
Special Weather Statement	49
Flooding
Areal Flood Warning	2
Flash Flood Warning	1
River Flood Warning	6
Flash Flood Watch	1
Flood Watch	2
Areal Flood Advisory	8
Winter
Winter Storm Warning	1
Winter Storm Watch	1
Winter Weather Advisory	2
Heat
Excessive Heat Warning	1
Heat Advisory	7
Cold
Freeze Warning	1
Freeze Watch	1
Wind and dust
Wind Advisory	3
Fog and smoke
Dense Fog Advisory	6

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2016 2018

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.