Alert archive / North Carolina / Johnston County
Weather alerts in Johnston County, North Carolina, 2009
186 weather alerts in 2009, 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 2009. Tap one for its archive.
- Alerts
- 186
- Warnings
- 79
- Watches
- 29
- Advisories
- 31
- Busiest month
- July39 alerts
- Busiest day
- July 17, 200910 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
6 of 8 tornado warnings covering Johnston County in 2009 had a tornado report inside them; 4 of 4 tornado reports fell inside a warning, on average 25 minutes after it went out.
Johnston County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 8 | 6 | 25% | 4 | 100% | 25 min |
| Severe thunderstorm warnings | 50 | 31 | 38% | 18 | 89% | 26 min |
| Flash flood warnings | 4 | 2 | 50% | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Raleigh, NC: tornado warnings | 24 | 9 | 63% | 18 | 94% | 21 min |
| NWS Raleigh, NC: severe thunderstorm warnings | 333 | 181 | 46% | 356 | 88% | 23 min |
| NWS Raleigh, NC: flash flood warnings | 41 | 20 | 51% | 56 | 84% | 66 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, 2:06 AM EST | Dense Fog Advisory | RAH | 9 hr |
| Jan 4, 9:58 PM EST | Dense Fog Advisory | RAH | 8 hr |
| Jan 6, 11:34 PM EST | Dense Fog Advisory | RAH | 6 hr |
| Jan 7, 3:38 AM EST | Wind Advisory | RAH | 18 hr |
| Jan 7, 8:59 AM EST | Severe Thunderstorm Warning | RAH | 61 min |
| Jan 7, 5:18 PM EST | High Wind Warning | RAH | 115 min |
| Jan 18, 9:37 PM EST | Dense Fog Advisory | RAH | 11 hr |
| Jan 19, 3:59 AM EST | Winter Storm Watch | RAH | 11 hr |
| Jan 19, 2:31 PM EST | Winter Storm Warning | RAH | 25 hr |
| Jan 20, 6:39 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 20, 3:34 PM EST | Winter Weather Advisory | RAH | 17 hr |
| Jan 21, 1:20 PM EST | Winter Weather Advisory | RAH | 20 hr |
| Jan 28, 6:05 AM EST | Dense Fog Advisory | RAH | 4 hr |
| Feb 3, 12:30 PM EST | Winter Weather Advisory | RAH | 20 hr |
| Feb 11, 10:22 AM EST | Fire Weather Watch | RAH | 19 hr |
| Feb 12, 5:36 AM EST | Red Flag Warning | RAH | 14 hr |
| Mar 1, 4:25 AM EST | Winter Weather Advisory | RAH | 26 hr |
| Mar 2, 10:33 AM EST | River Flood Warning | RAH | 20 hr |
| Mar 2, 11:02 AM EST | Winter Weather Advisory | RAH | 22 hr |
| Mar 18, 3:17 AM EDT | Dense Fog Advisory | RAH | 9 hr |
| Mar 27, 5:55 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Mar 27, 6:13 PM EDT | Tornado Warning | RAH | 51 min |
| Mar 27, 6:15 PM EDT | Tornado Warning | RAH | 45 min |
| Mar 27, 6:56 PM EDT | Tornado Warning | RAH | 49 min |
| Mar 27, 7:16 PM EDT | Tornado Warning | RAH | 31 min |
| Mar 28, 4:25 PM EDT | Severe Thunderstorm Warning | RAH | 39 min |
| Mar 28, 4:53 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Mar 29, 5:40 PM EDT | River Flood Warning | RAH | 17 hr |
| Apr 3, 4:10 AM EDT | Wind Advisory | RAH | 16 hr |
| Apr 6, 3:37 AM EDT | Mesoscale Discussion | SPC | 83 min |
| Apr 6, 8:03 AM EDT | Tornado Watch | SPC | 7 hr |
| Apr 6, 9:48 AM EDT | Severe Thunderstorm Warning | RAH | 27 min |
| Apr 6, 10:15 AM EDT | Severe Thunderstorm Warning | RAH | 45 min |
| Apr 6, 10:33 AM EDT | Mesoscale Discussion | SPC | 57 min |
| Apr 6, 3:47 PM EDT | Freeze Watch | RAH | 24 hr |
| Apr 7, 3:30 PM EDT | Freeze Warning | RAH | 16 hr |
| Apr 10, 11:20 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 14, 11:22 AM EDT | Mesoscale Discussion | SPC | 83 min |
| Apr 14, 1:55 PM EDT | Severe Thunderstorm Warning | RAH | 50 min |
| Apr 16, 3:30 PM EDT | Frost Advisory | RAH | 18 hr |
| Apr 20, 2:09 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 20, 3:16 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 20, 5:42 PM EDT | Severe Thunderstorm Warning | RAH | 36 min |
| Apr 22, 10:01 AM EDT | Red Flag Warning | RAH | 8 hr |
| Apr 24, 6:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| May 4, 1:15 PM EDT | Mesoscale Discussion | SPC | 60 min |
| May 4, 1:30 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 4, 6:15 PM EDT | Mesoscale Discussion | SPC | 60 min |
| May 4, 7:39 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 5, 2:51 PM EDT | Severe Thunderstorm Warning | RAH | 39 min |
| May 5, 4:04 PM EDT | Severe Thunderstorm Warning | RAH | 41 min |
| May 5, 4:12 PM EDT | Tornado Warning | RAH | 48 min |
| May 5, 5:22 PM EDT | Severe Thunderstorm Warning | RAH | 38 min |
| May 5, 5:28 PM EDT | Tornado Warning | RAH | 47 min |
| May 5, 5:37 PM EDT | Mesoscale Discussion | SPC | 53 min |
| May 5, 5:45 PM EDT | Tornado Watch | SPC | 5 hr |
| May 5, 7:10 PM EDT | Mesoscale Discussion | SPC | 65 min |
| May 5, 8:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| May 6, 11:40 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 6, 2:16 PM EDT | Tornado Watch | SPC | 6 hr |
| May 6, 4:12 PM EDT | Severe Thunderstorm Warning | RAH | 48 min |
| May 6, 7:29 PM EDT | Mesoscale Discussion | SPC | 91 min |
| May 6, 8:26 PM EDT | Tornado Watch | SPC | 8 hr |
| May 7, 5:17 AM EDT | Mesoscale Discussion | SPC | 118 min |
| May 7, 3:03 PM EDT | Mesoscale Discussion | SPC | 117 min |
| May 7, 6:10 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 7, 6:14 PM EDT | Severe Thunderstorm Warning | RAH | 46 min |
| May 7, 7:00 PM EDT | Severe Thunderstorm Warning | RAH | 45 min |
| May 7, 7:33 PM EDT | Mesoscale Discussion | SPC | 57 min |
| May 7, 10:18 PM EDT | Mesoscale Discussion | SPC | 87 min |
| May 8, 1:17 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| May 8, 2:02 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 9, 5:58 PM EDT | Mesoscale Discussion | SPC | 62 min |
| May 9, 6:25 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 28, 3:49 PM EDT | Mesoscale Discussion | SPC | 56 min |
| May 28, 6:08 PM EDT | Areal Flood Advisory | RAH | 61 min |
| May 29, 2:22 PM EDT | Mesoscale Discussion | SPC | 23 min |
| May 29, 2:41 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 29, 6:01 PM EDT | Mesoscale Discussion | SPC | 59 min |
| May 29, 6:15 PM EDT | Severe Thunderstorm Warning | RAH | 45 min |
| May 29, 6:56 PM EDT | Severe Thunderstorm Warning | RAH | 64 min |
| May 29, 7:06 PM EDT | Severe Thunderstorm Warning | RAH | 54 min |
| May 31, 2:48 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jun 8, 5:03 AM EDT | Dense Fog Advisory | RAH | 4 hr |
| Jun 9, 2:15 PM EDT | Severe Thunderstorm Warning | RAH | 60 min |
| Jun 9, 2:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 9, 3:14 PM EDT | Severe Thunderstorm Warning | RAH | 46 min |
| Jun 9, 4:30 PM EDT | Severe Thunderstorm Warning | RAH | 35 min |
| Jun 11, 5:58 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 11, 6:20 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 11, 8:24 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Jun 12, 4:49 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 15, 1:26 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jun 15, 3:21 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 16, 4:20 AM EDT | Flash Flood Watch | RAH | 9 hr |
| Jun 16, 6:45 AM EDT | Flash Flood Warning | RAH | 3 hr |
| Jun 16, 9:39 AM EDT | Flash Flood Warning | RAH | 111 min |
| Jun 16, 12:20 PM EDT | River Flood Warning | RAH | 52 hr |
| Jun 16, 12:20 PM EDT | River Flood Warning | RAH | 26 hr |
| Jun 26, 1:17 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jun 26, 2:11 PM EDT | Severe Thunderstorm Warning | RAH | 64 min |
| Jun 26, 3:36 PM EDT | Severe Thunderstorm Warning | RAH | 39 min |
| Jun 27, 3:16 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 27, 4:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 27, 7:27 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Jul 1, 8:30 PM EDT | Severe Thunderstorm Warning | RAH | 45 min |
| Jul 1, 11:43 PM EDT | Severe Thunderstorm Warning | RAH | 37 min |
| Jul 2, 12:02 AM EDT | Severe Thunderstorm Warning | RAH | 43 min |
| Jul 13, 8:06 AM EDT | Mesoscale Discussion | SPC | 54 min |
| Jul 13, 8:34 AM EDT | Severe Thunderstorm Warning | RAH | 56 min |
| Jul 13, 9:24 AM EDT | Severe Thunderstorm Warning | RAH | 51 min |
| Jul 16, 1:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jul 16, 3:08 PM EDT | Severe Thunderstorm Warning | RAH | 39 min |
| Jul 17, 9:52 AM EDT | Mesoscale Discussion | SPC | 83 min |
| Jul 17, 2:42 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 17, 5:10 PM EDT | Severe Thunderstorm Warning | RAH | 50 min |
| Jul 17, 5:52 PM EDT | Severe Thunderstorm Warning | RAH | 68 min |
| Jul 17, 6:10 PM EDT | Severe Thunderstorm Warning | RAH | 50 min |
| Jul 17, 6:33 PM EDT | Tornado Warning | RAH | 27 min |
| Jul 17, 6:44 PM EDT | Tornado Warning | RAH | 16 min |
| Jul 17, 6:45 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jul 17, 6:57 PM EDT | Severe Thunderstorm Warning | RAH | 48 min |
| Jul 17, 7:01 PM EDT | Severe Thunderstorm Warning | RAH | 44 min |
| Jul 17, 9:15 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jul 20, 6:21 PM EDT | Severe Thunderstorm Warning | RAH | 22 min |
| Jul 23, 7:55 PM EDT | Severe Thunderstorm Warning | RAH | 36 min |
| Jul 23, 10:29 PM EDT | Severe Thunderstorm Warning | RAH | 61 min |
| Jul 23, 11:02 PM EDT | Areal Flood Advisory | RAH | 93 min |
| Jul 25, 5:49 PM EDT | Severe Thunderstorm Warning | RAH | 56 min |
| Jul 25, 6:30 PM EDT | Severe Thunderstorm Warning | RAH | 45 min |
| Jul 25, 7:44 PM EDT | Severe Thunderstorm Warning | RAH | 46 min |
| Jul 25, 9:25 PM EDT | Flash Flood Warning | RAH | 75 min |
| Jul 27, 11:58 AM EDT | Mesoscale Discussion | SPC | 92 min |
| Jul 27, 12:49 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 27, 3:45 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jul 27, 3:46 PM EDT | Severe Thunderstorm Warning | RAH | 59 min |
| Jul 27, 4:17 PM EDT | Severe Thunderstorm Warning | RAH | 58 min |
| Jul 31, 1:44 PM EDT | Severe Thunderstorm Warning | RAH | 46 min |
| Jul 31, 2:23 PM EDT | Severe Thunderstorm Warning | RAH | 52 min |
| Jul 31, 2:25 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 31, 4:25 PM EDT | Severe Thunderstorm Warning | RAH | 50 min |
| Jul 31, 4:47 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jul 31, 5:14 PM EDT | Severe Thunderstorm Warning | RAH | 46 min |
| Jul 31, 6:54 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Aug 2, 11:33 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 5, 2:48 PM EDT | Severe Thunderstorm Warning | RAH | 42 min |
| Aug 5, 3:00 PM EDT | Severe Thunderstorm Warning | RAH | 45 min |
| Aug 5, 3:10 PM EDT | Severe Thunderstorm Warning | RAH | 65 min |
| Aug 5, 4:11 PM EDT | Severe Thunderstorm Warning | RAH | 64 min |
| Aug 9, 2:47 PM EDT | Heat Advisory | RAH | 29 hr |
| Aug 11, 3:21 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 11, 7:56 PM EDT | Severe Thunderstorm Warning | RAH | 49 min |
| Aug 11, 8:17 PM EDT | Flash Flood Warning | RAH | 3 hr |
| Aug 12, 11:25 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 12, 12:23 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 14, 11:10 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| Aug 17, 4:36 PM EDT | Severe Thunderstorm Warning | RAH | 39 min |
| Aug 22, 11:58 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 22, 6:03 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Aug 23, 6:01 PM EDT | Severe Thunderstorm Warning | RAH | 29 min |
| Sep 28, 5:47 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Oct 19, 2:05 AM EDT | Frost Advisory | RAH | 31 hr |
| Oct 24, 12:19 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Nov 6, 3:23 AM EST | Freeze Watch | RAH | 6 hr |
| Nov 6, 9:03 AM EST | Freeze Warning | RAH | 24 hr |
| Nov 10, 2:35 PM EST | Flash Flood Watch | RAH | 54 hr |
| Nov 11, 3:37 AM EST | Wind Advisory | RAH | 50 hr |
| Nov 11, 9:11 AM EST | Areal Flood Advisory | RAH | 6 hr |
| Nov 11, 12:45 PM EST | River Flood Warning | RAH | 30 hr |
| Nov 11, 12:45 PM EST | River Flood Warning | RAH | 50 hr |
| Nov 15, 9:16 PM EST | Dense Fog Advisory | RAH | 12 hr |
| Nov 19, 9:39 PM EST | Dense Fog Advisory | RAH | 8 hr |
| Nov 26, 1:36 AM EST | Dense Fog Advisory | RAH | 8 hr |
| Dec 2, 6:59 PM EST | Tornado Watch | SPC | 8 hr |
| Dec 2, 8:12 PM EST | Areal Flood Advisory | RAH | 3 hr |
| Dec 2, 8:31 PM EST | Mesoscale Discussion | SPC | 89 min |
| Dec 3, 12:12 AM EST | Mesoscale Discussion | SPC | 93 min |
| Dec 3, 11:10 AM EST | River Flood Warning | RAH | 10 hr |
| Dec 3, 11:10 AM EST | River Flood Warning | RAH | 35 hr |
| Dec 3, 9:36 PM EST | River Flood Warning | RAH | 7 hr |
| Dec 8, 9:10 PM EST | Wind Advisory | RAH | 24 hr |
| Dec 9, 12:51 PM EST | River Flood Warning | RAH | 52 hr |
| Dec 9, 2:51 PM EST | River Flood Warning | RAH | 13 hr |
| Dec 13, 7:54 PM EST | Dense Fog Advisory | RAH | 16 hr |
| Dec 15, 4:23 AM EST | Dense Fog Advisory | RAH | 6 hr |
| Dec 17, 4:25 PM EST | Winter Weather Advisory | RAH | 44 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 | 50 |
| Tornado Warning | 8 |
| Severe Thunderstorm Watch | 18 |
| Tornado Watch | 5 |
| Mesoscale Discussion | 47 |
| Flooding | |
| Flash Flood Warning | 4 |
| River Flood Warning | 11 |
| Flash Flood Watch | 2 |
| Areal Flood Advisory | 6 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 6 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 2 |
| Frost Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 4 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 12 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20082010
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.