Alert archive / North Carolina / Johnston County
Weather alerts in Johnston County, North Carolina, 2020
204 weather alerts in 2020, 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 2020. Tap one for its archive.
- Alerts
- 204
- Warnings
- 65
- Watches
- 12
- Advisories
- 55
- Busiest month
- August30 alerts
- Busiest day
- December 24, 202012 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 4 tornado warnings covering Johnston County in 2020 had a tornado report inside them.
Johnston County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 27 | 20 | 26% | 14 | 93% | 21 min |
| Flash flood warnings | 6 | 5 | 17% | 9 | 89% | 184 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 3, 8:39 PM EST | Special Weather Statement | RAH | 66 min |
| Jan 4, 8:36 PM EST | Special Weather Statement | RAH | 54 min |
| Jan 11, 10:59 PM EST | Mesoscale Discussion | SPC | 91 min |
| Jan 11, 11:25 PM EST | Severe Thunderstorm Watch | SPC | 4 hr |
| Jan 11, 11:52 PM EST | Severe Thunderstorm Warning | RAH | 68 min |
| Jan 12, 12:57 AM EST | Severe Thunderstorm Warning | RAH | 78 min |
| Jan 13, 12:46 PM EST | Mesoscale Discussion | SPC | 119 min |
| Jan 13, 1:50 PM EST | Special Weather Statement | RAH | 55 min |
| Jan 13, 2:37 PM EST | Severe Thunderstorm Warning | RAH | 38 min |
| Jan 13, 11:16 PM EST | Special Weather Statement | RAH | 59 min |
| Jan 14, 12:03 AM EST | Areal Flood Advisory | RAH | 3 hr |
| Jan 24, 11:53 PM EST | Special Weather Statement | RAH | 52 min |
| Jan 25, 1:17 AM EST | Special Weather Statement | RAH | 73 min |
| Feb 6, 11:55 AM EST | Mesoscale Discussion | SPC | 65 min |
| Feb 6, 12:41 PM EST | Tornado Watch | SPC | 6 hr |
| Feb 6, 2:17 PM EST | Severe Thunderstorm Warning | RAH | 43 min |
| Feb 6, 5:18 PM EST | Areal Flood Advisory | RAH | 6 hr |
| Feb 6, 6:55 PM EST | Areal Flood Warning | RAH | 11 hr |
| Feb 6, 6:58 PM EST | River Flood Warning | RAH | 41 hr |
| Feb 6, 6:58 PM EST | River Flood Warning | RAH | 4 days |
| Feb 6, 9:16 PM EST | Wind Advisory | RAH | 19 hr |
| Feb 13, 10:29 AM EST | Mesoscale Discussion | SPC | 61 min |
| Feb 13, 11:49 AM EST | Special Weather Statement | RAH | 56 min |
| Feb 14, 6:56 AM EST | River Flood Warning | RAH | 12 days |
| 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 26, 3:31 AM EST | Dense Fog Advisory | RAH | 5 hr |
| Feb 26, 9:04 AM EST | Dense Fog Advisory | RAH | 116 min |
| Mar 11, 8:12 PM EDT | Special Weather Statement | RAH | 48 min |
| Mar 18, 4:25 AM EDT | Dense Fog Advisory | RAH | 6 hr |
| Apr 7, 4:32 AM EDT | Dense Fog Advisory | RAH | 5 hr |
| Apr 8, 6:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Apr 8, 6:42 PM EDT | Severe Thunderstorm Warning | RAH | 48 min |
| Apr 8, 7:21 PM EDT | Severe Thunderstorm Warning | RAH | 54 min |
| Apr 8, 7:53 PM EDT | Severe Thunderstorm Warning | RAH | 67 min |
| Apr 9, 6:27 AM EDT | Special Weather Statement | RAH | 63 min |
| Apr 10, 10:49 AM EDT | Red Flag Warning | RAH | 7 hr |
| Apr 10, 3:13 PM EDT | Frost Advisory | RAH | 17 hr |
| Apr 12, 3:33 PM EDT | Wind Advisory | RAH | 24 hr |
| Apr 13, 4:40 AM EDT | Mesoscale Discussion | SPC | 95 min |
| Apr 13, 5:01 AM EDT | Tornado Watch | SPC | 7 hr |
| Apr 13, 6:46 AM EDT | Mesoscale Discussion | SPC | 89 min |
| Apr 13, 8:00 AM EDT | Severe Thunderstorm Warning | RAH | 60 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, 10:24 AM EDT | Special Weather Statement | RAH | 51 min |
| Apr 26, 1:25 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 30, 5:50 AM EDT | Special Weather Statement | RAH | 55 min |
| Apr 30, 6:47 AM EDT | Special Weather Statement | RAH | 43 min |
| Apr 30, 7:15 AM EDT | Special Weather Statement | RAH | 75 min |
| Apr 30, 7:58 AM EDT | Severe Thunderstorm Warning | RAH | 47 min |
| Apr 30, 8:43 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| May 5, 3:53 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 6, 4:49 PM EDT | Special Weather Statement | RAH | 71 min |
| May 9, 3:57 AM EDT | Frost Advisory | RAH | 28 hr |
| May 19, 3:39 PM EDT | Flash Flood Watch | RAH | 60 hr |
| May 21, 9:58 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| May 21, 7:56 PM EDT | Special Weather Statement | RAH | 49 min |
| May 22, 12:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| May 22, 4:14 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 22, 6:23 PM EDT | Severe Thunderstorm Warning | RAH | 67 min |
| May 22, 6:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| May 25, 10:21 PM EDT | River Flood Warning | RAH | 8 days |
| May 29, 12:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| May 29, 1:58 PM EDT | River Flood Warning | RAH | 39 hr |
| May 29, 4:01 PM EDT | Special Weather Statement | RAH | 59 min |
| May 30, 7:55 PM EDT | Special Weather Statement | RAH | 50 min |
| May 30, 8:42 PM EDT | Special Weather Statement | RAH | 48 min |
| Jun 11, 3:59 AM EDT | Flash Flood Watch | RAH | 24 hr |
| Jun 11, 1:14 PM EDT | Special Weather Statement | RAH | 91 min |
| Jun 11, 1:38 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jun 15, 11:32 AM EDT | Areal Flood Advisory | RAH | 6 hr |
| Jun 19, 2:59 PM EDT | Special Weather Statement | RAH | 61 min |
| Jun 19, 3:21 PM EDT | Areal Flood Advisory | RAH | 114 min |
| Jun 19, 6:26 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jun 19, 7:47 PM EDT | Flash Flood Warning | RAH | 6 hr |
| Jun 22, 10:23 PM EDT | Special Weather Statement | RAH | 67 min |
| Jun 22, 10:52 PM EDT | Special Weather Statement | RAH | 23 min |
| Jun 22, 11:07 PM EDT | Special Weather Statement | RAH | 38 min |
| Jun 28, 5:30 PM EDT | Severe Thunderstorm Warning | RAH | 31 min |
| Jun 28, 5:45 PM EDT | Severe Thunderstorm Warning | RAH | 45 min |
| Jun 30, 3:29 PM EDT | Severe Thunderstorm Warning | RAH | 31 min |
| Jun 30, 4:09 PM EDT | Special Weather Statement | RAH | 51 min |
| Jun 30, 4:35 PM EDT | Severe Thunderstorm Warning | RAH | 40 min |
| Jul 1, 1:46 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Jul 5, 5:04 PM EDT | Severe Thunderstorm Warning | RAH | 41 min |
| Jul 5, 5:36 PM EDT | Areal Flood Advisory | RAH | 114 min |
| Jul 10, 11:43 PM EDT | Severe Thunderstorm Warning | RAH | 47 min |
| Jul 13, 4:17 AM EDT | Special Weather Statement | RAH | 73 min |
| Jul 13, 1:21 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jul 13, 6:07 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jul 13, 6:32 PM EDT | Special Weather Statement | RAH | 58 min |
| Jul 13, 6:44 PM EDT | Severe Thunderstorm Warning | RAH | 46 min |
| Jul 13, 7:19 PM EDT | Severe Thunderstorm Warning | RAH | 41 min |
| Jul 18, 3:18 PM EDT | Heat Advisory | RAH | 30 hr |
| Jul 18, 3:49 PM EDT | Severe Thunderstorm Warning | RAH | 56 min |
| Jul 18, 4:03 PM EDT | Flash Flood Warning | RAH | 91 min |
| Jul 18, 4:52 PM EDT | Severe Thunderstorm Warning | RAH | 53 min |
| Jul 19, 2:59 PM EDT | Heat Advisory | RAH | 30 hr |
| Jul 20, 3:49 AM EDT | Excessive Heat Warning | RAH | 17 hr |
| Jul 20, 3:23 PM EDT | Heat Advisory | RAH | 30 hr |
| Jul 20, 6:21 PM EDT | Special Weather Statement | RAH | 39 min |
| Jul 21, 3:59 AM EDT | Excessive Heat Warning | RAH | 17 hr |
| Jul 21, 3:00 PM EDT | Heat Advisory | RAH | 30 hr |
| Jul 23, 3:09 AM EDT | Heat Advisory | RAH | 17 hr |
| Jul 23, 1:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 5:00 PM EDT | Areal Flood Advisory | RAH | 2 hr |
| Jul 23, 5:24 PM EDT | Special Weather Statement | RAH | 51 min |
| Jul 27, 3:32 AM EDT | Heat Advisory | RAH | 16 hr |
| Jul 28, 3:41 AM EDT | Heat Advisory | RAH | 16 hr |
| Jul 28, 7:29 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jul 31, 3:43 AM EDT | Heat Advisory | RAH | 15 hr |
| Aug 1, 12:51 AM EDT | Severe Thunderstorm Warning | RAH | 54 min |
| Aug 1, 3:55 AM EDT | Heat Advisory | RAH | 14 hr |
| Aug 1, 12:42 PM EDT | Special Weather Statement | RAH | 63 min |
| Aug 1, 1:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 1, 4:07 PM EDT | Special Weather Statement | RAH | 53 min |
| Aug 1, 4:16 PM EDT | Severe Thunderstorm Warning | RAH | 59 min |
| Aug 2, 4:06 AM EDT | Flash Flood Watch | RAH | 52 hr |
| Aug 2, 5:17 AM EDT | Tropical Storm Watch | RAH | 30 hr |
| Aug 2, 5:06 PM EDT | Tropical Storm Warning | RAH | 39 hr |
| Aug 3, 10:50 AM EDT | River Flood Warning | RAH | 4 days |
| Aug 3, 10:50 AM EDT | River Flood Warning | RAH | 60 hr |
| Aug 3, 2:58 PM EDT | Special Weather Statement | RAH | 62 min |
| Aug 3, 4:07 PM EDT | Special Weather Statement | RAH | 53 min |
| Aug 3, 8:03 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Aug 3, 11:08 PM EDT | Special Weather Statement | RAH | 52 min |
| Aug 3, 11:45 PM EDT | Flash Flood Warning | RAH | 6 hr |
| Aug 5, 11:27 AM EDT | Special Weather Statement | RAH | 48 min |
| Aug 6, 3:42 PM EDT | Severe Thunderstorm Warning | RAH | 48 min |
| Aug 6, 4:31 PM EDT | Special Weather Statement | RAH | 59 min |
| Aug 6, 4:56 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Aug 7, 3:47 PM EDT | Special Weather Statement | RAH | 58 min |
| Aug 9, 4:20 PM EDT | Special Weather Statement | RAH | 40 min |
| Aug 10, 4:41 PM EDT | Special Weather Statement | RAH | 64 min |
| Aug 14, 8:48 PM EDT | Areal Flood Advisory | RAH | 117 min |
| Aug 15, 2:38 PM EDT | Areal Flood Advisory | RAH | 55 min |
| Aug 17, 7:22 PM EDT | Special Weather Statement | RAH | 83 min |
| Aug 31, 3:54 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Aug 31, 5:57 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Aug 31, 6:22 PM EDT | Special Weather Statement | RAH | 53 min |
| Aug 31, 6:56 PM EDT | Flash Flood Warning | RAH | 5 hr |
| Aug 31, 11:14 PM EDT | Flash Flood Warning | RAH | 4 hr |
| Sep 1, 2:51 AM EDT | River Flood Warning | RAH | 68 hr |
| Sep 1, 3:15 AM EDT | Areal Flood Warning | RAH | 8 hr |
| Sep 1, 6:47 AM EDT | River Flood Warning | RAH | 19 hr |
| Sep 1, 12:13 PM EDT | Areal Flood Warning | RAH | 12 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, 4:11 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Sep 11, 5:54 PM EDT | Special Weather Statement | RAH | 66 min |
| Sep 16, 4:19 AM EDT | Flash Flood Watch | RAH | 47 hr |
| 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 |
| Sep 29, 8:45 PM EDT | Severe Thunderstorm Warning | RAH | 60 min |
| Sep 30, 3:01 PM EDT | River Flood Warning | RAH | 15 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 30, 1:47 AM EDT | Special Weather Statement | RAH | 58 min |
| Nov 2, 1:59 PM EST | Frost Advisory | RAH | 18 hr |
| Nov 2, 1:59 PM EST | Freeze Warning | RAH | 18 hr |
| Nov 6, 2:22 AM EST | Dense Fog Advisory | RAH | 7 hr |
| Nov 7, 2:24 AM EST | Dense Fog Advisory | RAH | 6 hr |
| Nov 11, 3:08 AM EST | Flash Flood Watch | RAH | 36 hr |
| Nov 11, 4:13 PM EST | Areal Flood Advisory | RAH | 3 hr |
| Nov 11, 10:01 PM EST | River Flood Warning | RAH | 4 days |
| Nov 11, 10:08 PM EST | Areal Flood Advisory | RAH | 3 hr |
| Nov 12, 6:43 AM EST | Areal Flood Advisory | RAH | 3 hr |
| Nov 12, 7:34 AM EST | Areal Flood Warning | RAH | 3 hr |
| Nov 12, 8:33 AM EST | Flash Flood Warning | RAH | 8 hr |
| Nov 12, 9:28 AM EST | Special Weather Statement | RAH | 62 min |
| Nov 12, 11:55 AM EST | River Flood Warning | RAH | 3 days |
| Nov 12, 4:25 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, 12:26 PM EST | Special Weather Statement | RAH | 64 min |
| Nov 30, 12:26 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Dec 4, 11:26 PM EST | Special Weather Statement | RAH | 49 min |
| Dec 5, 12:16 AM EST | Special Weather Statement | RAH | 74 min |
| Dec 17, 8:37 PM EST | River Flood Warning | RAH | 5 days |
| Dec 24, 9:24 AM EST | Wind Advisory | RAH | 16 hr |
| Dec 24, 12:12 PM EST | Special Weather Statement | RAH | 63 min |
| Dec 24, 12:16 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Dec 24, 1:17 PM EST | Special Weather Statement | RAH | 58 min |
| Dec 24, 2:19 PM EST | Tornado Watch | SPC | 9 hr |
| Dec 24, 2:33 PM EST | Special Weather Statement | RAH | 57 min |
| Dec 24, 2:35 PM EST | Tornado Warning | RAH | 40 min |
| Dec 24, 3:15 PM EST | Tornado Warning | RAH | 18 min |
| Dec 24, 3:28 PM EST | Tornado Warning | RAH | 32 min |
| Dec 24, 3:45 PM EST | Severe Thunderstorm Warning | RAH | 30 min |
| Dec 24, 3:58 PM EST | Tornado Warning | RAH | 32 min |
| Dec 24, 4:30 PM EST | Severe Thunderstorm Warning | RAH | 60 min |
| Dec 24, 7:13 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Dec 24, 8:30 PM EST | Special Weather Statement | RAH | 60 min |
| Dec 24, 8:58 PM EST | Severe Thunderstorm Warning | RAH | 62 min |
| Dec 24, 9:06 PM EST | River Flood Warning | RAH | 32 hr |
| Dec 24, 9:06 PM EST | River Flood Warning | RAH | 3 days |
| Dec 29, 1:56 PM EST | River Flood Warning | RAH | 10 days |
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 | 27 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 22 |
| Special Weather Statement | 50 |
| Flooding | |
| Areal Flood Warning | 6 |
| Flash Flood Warning | 6 |
| River Flood Warning | 16 |
| Flash Flood Watch | 5 |
| Areal Flood Advisory | 20 |
| Winter | |
| Winter Weather Advisory | 2 |
| Heat | |
| Excessive Heat Warning | 2 |
| Heat Advisory | 11 |
| Cold | |
| Freeze Warning | 1 |
| Frost Advisory | 5 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 5 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 12 |
| Tropical | |
| Tropical Storm Warning | 1 |
| Tropical Storm Watch | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.