Alert archive / North Carolina / Onslow County
Weather alerts in Onslow County, North Carolina, 2009
109 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Onslow County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 109
- Warnings
- 34
- Watches
- 19
- Advisories
- 12
- Busiest month
- May23 alerts
- Busiest day
- July 24, 20099 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 1 tornado warnings covering Onslow County in 2009 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 27 minutes after it went out.
Onslow County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 1 | 0% | 1 | 100% | 27 min |
| Severe thunderstorm warnings | 25 | 6 | 76% | 6 | 33% | 14 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Newport/Morehead City, NC: tornado warnings | 33 | 9 | 73% | 18 | 78% | 22 min |
| NWS Newport/Morehead City, NC: severe thunderstorm warnings | 126 | 38 | 70% | 88 | 83% | 20 min |
| NWS Newport/Morehead City, NC: flash flood warnings | 0 | 1 | 0% |
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, 5:23 PM EST | Severe Thunderstorm Warning | MHX | 52 min |
| Jan 7, 6:35 PM EST | Severe Thunderstorm Warning | MHX | 25 min |
| Jan 28, 5:37 PM EST | Mesoscale Discussion | SPC | 83 min |
| Mar 27, 5:55 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Mar 28, 4:53 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Mar 28, 5:38 PM EDT | Tornado Watch | SPC | 6 hr |
| Mar 28, 8:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Apr 6, 3:37 AM EDT | Mesoscale Discussion | SPC | 83 min |
| Apr 6, 8:03 AM EDT | Tornado Watch | SPC | 7 hr |
| Apr 6, 10:33 AM EDT | Mesoscale Discussion | SPC | 57 min |
| Apr 10, 11:20 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 11, 1:48 AM EDT | Mesoscale Discussion | SPC | 57 min |
| Apr 14, 11:22 AM EDT | Mesoscale Discussion | SPC | 83 min |
| Apr 20, 12:22 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Apr 20, 3:16 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 20, 4:55 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Apr 20, 5:58 PM EDT | Severe Thunderstorm Warning | MHX | 28 min |
| Apr 20, 7:36 PM EDT | Mesoscale Discussion | SPC | 84 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, 4:33 PM EDT | Mesoscale Discussion | SPC | 57 min |
| May 4, 6:15 PM EDT | Mesoscale Discussion | SPC | 60 min |
| May 4, 7:39 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 4, 9:08 PM EDT | Mesoscale Discussion | SPC | 97 min |
| May 5, 9:43 AM EDT | Mesoscale Discussion | SPC | 92 min |
| May 5, 10:18 AM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 5, 12:32 PM EDT | Severe Thunderstorm Warning | MHX | 43 min |
| May 5, 5:37 PM EDT | Mesoscale Discussion | SPC | 53 min |
| May 5, 5:45 PM EDT | Tornado Watch | SPC | 5 hr |
| May 7, 5:17 AM EDT | Mesoscale Discussion | SPC | 118 min |
| May 7, 5:55 PM EDT | Severe Thunderstorm Warning | MHX | 50 min |
| May 7, 6:10 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 7, 6:33 PM EDT | Tornado Warning | MHX | 42 min |
| May 7, 7:33 PM EDT | Mesoscale Discussion | SPC | 57 min |
| May 8, 2:02 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 9, 6:25 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 17, 4:02 PM EDT | Areal Flood Advisory | MHX | 3 hr |
| May 17, 4:35 PM EDT | Severe Thunderstorm Warning | MHX | 40 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 |
| Jun 9, 2:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 12, 4:49 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 12, 8:20 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jun 13, 6:01 PM EDT | Severe Thunderstorm Warning | MHX | 44 min |
| Jun 15, 1:26 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jun 15, 6:42 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Jun 23, 12:22 AM EDT | Severe Thunderstorm Warning | MHX | 53 min |
| Jun 26, 1:17 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jun 26, 4:02 PM EDT | Severe Thunderstorm Warning | MHX | 43 min |
| Jun 26, 4:45 PM EDT | Severe Thunderstorm Warning | MHX | 22 min |
| Jun 27, 3:16 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 1, 9:38 PM EDT | Severe Thunderstorm Warning | MHX | 52 min |
| Jul 1, 10:23 PM EDT | Severe Thunderstorm Warning | MHX | 33 min |
| Jul 5, 5:43 PM EDT | Severe Thunderstorm Warning | MHX | 18 min |
| Jul 16, 1:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jul 17, 2:42 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 17, 6:45 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jul 17, 9:15 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jul 23, 5:19 PM EDT | Severe Thunderstorm Warning | MHX | 41 min |
| Jul 24, 12:23 PM EDT | Severe Thunderstorm Warning | MHX | 37 min |
| Jul 24, 1:01 PM EDT | Severe Thunderstorm Warning | MHX | 44 min |
| Jul 24, 1:04 PM EDT | Severe Thunderstorm Warning | MHX | 41 min |
| Jul 24, 1:12 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Jul 24, 1:30 PM EDT | Severe Thunderstorm Warning | MHX | 45 min |
| Jul 24, 1:44 PM EDT | Severe Thunderstorm Warning | MHX | 46 min |
| Jul 24, 2:22 PM EDT | Areal Flood Advisory | MHX | 3 hr |
| Jul 24, 4:20 PM EDT | Severe Thunderstorm Warning | MHX | 40 min |
| Jul 24, 4:26 PM EDT | Areal Flood Warning | MHX | 3 hr |
| 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, 7:06 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Aug 5, 4:59 PM EDT | Severe Thunderstorm Warning | MHX | 46 min |
| Aug 5, 5:37 PM EDT | Severe Thunderstorm Warning | MHX | 23 min |
| Aug 6, 12:15 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Aug 6, 2:35 PM EDT | Areal Flood Advisory | MHX | 3 hr |
| Aug 6, 3:41 PM EDT | Areal Flood Warning | MHX | 94 min |
| Aug 11, 6:50 PM EDT | Severe Thunderstorm Warning | MHX | 30 min |
| Aug 12, 11:25 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 12, 12:23 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 12, 2:18 PM EDT | Areal Flood Advisory | MHX | 3 hr |
| Aug 12, 3:03 PM EDT | Areal Flood Warning | MHX | 4 hr |
| Aug 12, 4:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Aug 14, 9:22 AM EDT | Areal Flood Advisory | MHX | 83 min |
| Aug 22, 11:58 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 22, 2:20 PM EDT | Severe Thunderstorm Warning | MHX | 40 min |
| Aug 22, 6:03 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Sep 7, 12:27 PM EDT | Areal Flood Advisory | MHX | 3 hr |
| Sep 7, 2:55 PM EDT | Areal Flood Warning | MHX | 3 hr |
| Sep 7, 6:11 PM EDT | Areal Flood Warning | MHX | 5 hr |
| Oct 28, 2:15 AM EDT | Mesoscale Discussion | SPC | 60 min |
| Nov 11, 11:31 AM EST | Areal Flood Advisory | MHX | 3 hr |
| Nov 11, 2:18 PM EST | Areal Flood Advisory | MHX | 3 hr |
| Nov 11, 5:15 PM EST | Areal Flood Warning | MHX | 5 hr |
| Nov 11, 10:19 PM EST | Areal Flood Warning | MHX | 6 hr |
| Nov 12, 2:02 AM EST | Severe Thunderstorm Warning | MHX | 30 min |
| Nov 18, 11:31 PM EST | Areal Flood Advisory | MHX | 3 hr |
| Nov 19, 2:22 AM EST | Areal Flood Warning | MHX | 83 min |
| Nov 19, 4:44 AM EST | Areal Flood Advisory | MHX | 3 hr |
| Nov 19, 7:33 AM EST | Areal Flood Advisory | MHX | 3 hr |
| Dec 2, 2:10 PM EST | Areal Flood Advisory | MHX | 3 hr |
| Dec 2, 5:44 PM EST | Mesoscale Discussion | SPC | 91 min |
| Dec 2, 6:59 PM EST | Tornado Watch | SPC | 8 hr |
| Dec 2, 8:31 PM EST | Mesoscale Discussion | SPC | 89 min |
| Dec 3, 12:12 AM EST | Mesoscale Discussion | SPC | 93 min |
| Dec 9, 2:19 AM EST | Mesoscale Discussion | SPC | 116 min |
| Dec 9, 3:07 AM EST | Tornado Watch | SPC | 5 hr |
| Dec 9, 7:18 AM EST | Mesoscale Discussion | SPC | 57 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 | 25 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 14 |
| Tornado Watch | 5 |
| Mesoscale Discussion | 44 |
| Flooding | |
| Areal Flood Warning | 8 |
| Areal Flood 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.