Alert archive / North Carolina / Alamance County
Weather alerts in Alamance County, North Carolina, 2012
189 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Alamance County and its neighbors
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Alerts
- 189
- Warnings
- 32
- Watches
- 19
- Advisories
- 32
- Busiest month
- July59 alerts
- Busiest day
- September 18, 20129 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Alamance County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 25 | 20 | 20% | 36 | 86% | 29 min |
| Flash flood warnings | 1 | 1 | 0% | 0 |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Raleigh, NC: tornado warnings | 19 | 2 | 89% | 4 | 50% | 5 min |
| NWS Raleigh, NC: severe thunderstorm warnings | 367 | 272 | 26% | 706 | 88% | 25 min |
| NWS Raleigh, NC: flash flood warnings | 49 | 28 | 43% | 83 | 87% | 59 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 9, 10:15 PM EST | Dense Fog Advisory | RAH | 10 hr |
| Jan 11, 5:55 PM EST | Mesoscale Discussion | SPC | 35 min |
| Jan 11, 6:22 PM EST | Special Weather Statement | RAH | 68 min |
| Jan 23, 5:30 PM EST | Dense Fog Advisory | RAH | 19 hr |
| Feb 16, 10:25 PM EST | Dense Fog Advisory | RAH | 11 hr |
| Feb 19, 4:15 AM EST | Winter Weather Advisory | RAH | 29 hr |
| Feb 19, 5:27 PM EST | Special Weather Statement | RAH | 48 min |
| Feb 22, 11:42 PM EST | Severe Thunderstorm Warning | RAH | 48 min |
| Feb 23, 12:25 AM EST | Mesoscale Discussion | SPC | 95 min |
| Feb 24, 12:43 PM EST | Mesoscale Discussion | SPC | 92 min |
| Feb 24, 1:19 PM EST | Tornado Watch | SPC | 7 hr |
| Feb 24, 2:08 PM EST | Fire Weather Watch | RAH | 16 hr |
| Feb 24, 4:10 PM EST | Severe Thunderstorm Warning | RAH | 65 min |
| Feb 24, 4:45 PM EST | Mesoscale Discussion | SPC | 90 min |
| Feb 25, 6:17 AM EST | Red Flag Warning | RAH | 12 hr |
| Feb 28, 1:02 AM EST | Dense Fog Advisory | RAH | 7 hr |
| Mar 2, 7:52 PM EST | Dense Fog Advisory | RAH | 6 hr |
| Mar 17, 9:07 PM EDT | Special Weather Statement | RAH | 53 min |
| Mar 17, 9:44 PM EDT | Areal Flood Advisory | RAH | 106 min |
| Mar 17, 10:05 PM EDT | Special Weather Statement | RAH | 55 min |
| Mar 19, 6:13 AM EDT | Dense Fog Advisory | RAH | 3 hr |
| Mar 20, 3:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Mar 21, 6:00 AM EDT | Dense Fog Advisory | RAH | 4 hr |
| Mar 21, 1:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Mar 24, 12:03 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Mar 24, 12:46 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Mar 24, 3:38 PM EDT | Tornado Watch | SPC | 7 hr |
| Mar 24, 6:51 PM EDT | Severe Thunderstorm Warning | RAH | 84 min |
| Mar 24, 7:34 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Mar 24, 7:42 PM EDT | Severe Thunderstorm Warning | RAH | 64 min |
| Mar 24, 7:58 PM EDT | Areal Flood Advisory | RAH | 2 hr |
| Mar 26, 4:24 AM EDT | Frost Advisory | RAH | 28 hr |
| Mar 31, 10:41 PM EDT | Special Weather Statement | RAH | 34 min |
| Apr 4, 1:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Apr 4, 2:27 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 4, 3:04 PM EDT | Special Weather Statement | RAH | 56 min |
| Apr 4, 4:30 PM EDT | Special Weather Statement | RAH | 60 min |
| Apr 6, 3:26 PM EDT | Frost Advisory | RAH | 17 hr |
| Apr 8, 5:18 PM EDT | Fire Weather Watch | RAH | 17 hr |
| Apr 9, 10:03 AM EDT | Fire Weather Watch | RAH | 18 hr |
| Apr 9, 10:03 AM EDT | Red Flag Warning | RAH | 10 hr |
| Apr 10, 3:55 AM EDT | Red Flag Warning | RAH | 16 hr |
| Apr 10, 3:45 PM EDT | Freeze Watch | RAH | 19 hr |
| Apr 11, 11:06 AM EDT | Freeze Warning | RAH | 21 hr |
| Apr 12, 3:19 PM EDT | Frost Advisory | RAH | 17 hr |
| Apr 18, 2:26 AM EDT | Special Weather Statement | RAH | 49 min |
| Apr 21, 9:12 PM EDT | Special Weather Statement | RAH | 63 min |
| Apr 26, 3:07 AM EDT | Special Weather Statement | RAH | 83 min |
| Apr 26, 10:11 AM EDT | Special Weather Statement | RAH | 49 min |
| Apr 26, 10:56 AM EDT | Special Weather Statement | RAH | 64 min |
| May 1, 3:12 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 5, 5:16 PM EDT | Special Weather Statement | RAH | 59 min |
| May 5, 5:26 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| May 14, 12:23 PM EDT | Special Weather Statement | RAH | 82 min |
| May 15, 2:08 PM EDT | Mesoscale Discussion | SPC | 67 min |
| May 15, 3:13 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 15, 6:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| May 15, 8:42 PM EDT | Mesoscale Discussion | SPC | 63 min |
| May 22, 10:46 PM EDT | Special Weather Statement | RAH | 59 min |
| May 24, 1:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| May 28, 4:17 PM EDT | Special Weather Statement | RAH | 58 min |
| May 29, 3:03 PM EDT | Special Weather Statement | RAH | 87 min |
| May 29, 5:20 PM EDT | Special Weather Statement | RAH | 40 min |
| May 29, 6:24 PM EDT | Special Weather Statement | RAH | 36 min |
| Jun 1, 2:13 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 1, 2:41 PM EDT | Special Weather Statement | RAH | 64 min |
| Jun 1, 2:59 PM EDT | Severe Thunderstorm Warning | RAH | 46 min |
| Jun 1, 4:31 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jun 1, 7:42 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 6, 8:49 AM EDT | Special Weather Statement | RAH | 56 min |
| Jun 22, 4:10 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 24, 12:53 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 28, 1:04 PM EDT | Heat Advisory | RAH | 41 hr |
| Jun 29, 4:22 AM EDT | Excessive Heat Warning | RAH | 61 hr |
| Jun 29, 9:55 PM EDT | Special Weather Statement | RAH | 50 min |
| Jun 29, 10:04 PM EDT | Severe Thunderstorm Warning | RAH | 56 min |
| Jun 29, 11:44 PM EDT | Special Weather Statement | RAH | 91 min |
| Jun 30, 10:29 PM EDT | Special Weather Statement | RAH | 46 min |
| Jun 30, 10:58 PM EDT | Severe Thunderstorm Warning | RAH | 62 min |
| Jul 1, 11:38 AM EDT | Mesoscale Discussion | SPC | 97 min |
| Jul 1, 12:56 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 1, 1:41 PM EDT | Severe Thunderstorm Warning | RAH | 64 min |
| Jul 1, 7:04 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Jul 2, 12:57 AM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jul 2, 2:03 AM EDT | Special Weather Statement | RAH | 57 min |
| Jul 3, 5:00 PM EDT | Special Weather Statement | RAH | 60 min |
| Jul 3, 6:23 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 5, 3:08 PM EDT | Special Weather Statement | RAH | 37 min |
| Jul 6, 4:07 AM EDT | Heat Advisory | RAH | 40 hr |
| Jul 6, 4:47 PM EDT | Special Weather Statement | RAH | 58 min |
| Jul 6, 5:21 PM EDT | Areal Flood Advisory | RAH | 2 hr |
| Jul 7, 4:06 AM EDT | Excessive Heat Watch | RAH | 12 hr |
| Jul 7, 3:50 PM EDT | Heat Advisory | RAH | 29 hr |
| Jul 9, 1:36 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jul 9, 2:59 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 9, 5:53 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jul 9, 7:02 PM EDT | Special Weather Statement | RAH | 58 min |
| Jul 9, 7:17 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jul 9, 7:48 PM EDT | Flash Flood Warning | RAH | 3 hr |
| Jul 9, 8:08 PM EDT | Special Weather Statement | RAH | 52 min |
| Jul 9, 8:57 PM EDT | Special Weather Statement | RAH | 93 min |
| Jul 10, 12:58 PM EDT | Special Weather Statement | RAH | 47 min |
| Jul 11, 12:08 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jul 11, 2:09 PM EDT | Special Weather Statement | RAH | 51 min |
| Jul 11, 3:25 PM EDT | Special Weather Statement | RAH | 50 min |
| Jul 16, 4:18 PM EDT | Special Weather Statement | RAH | 57 min |
| Jul 16, 5:24 PM EDT | Special Weather Statement | RAH | 36 min |
| Jul 16, 7:26 PM EDT | Special Weather Statement | RAH | 49 min |
| Jul 19, 3:17 PM EDT | Special Weather Statement | RAH | 58 min |
| Jul 20, 2:47 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 5:13 PM EDT | Special Weather Statement | RAH | 62 min |
| Jul 20, 5:19 PM EDT | Severe Thunderstorm Warning | RAH | 41 min |
| Jul 20, 5:37 PM EDT | Areal Flood Advisory | RAH | 83 min |
| Jul 20, 5:54 PM EDT | Areal Flood Advisory | RAH | 2 hr |
| Jul 21, 2:17 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 21, 6:02 PM EDT | Severe Thunderstorm Warning | RAH | 58 min |
| Jul 21, 6:38 PM EDT | Severe Thunderstorm Warning | RAH | 52 min |
| Jul 22, 12:08 AM EDT | Special Weather Statement | RAH | 37 min |
| Jul 22, 12:43 AM EDT | Areal Flood Advisory | RAH | 107 min |
| Jul 22, 12:50 AM EDT | Special Weather Statement | RAH | 40 min |
| Jul 23, 12:58 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 23, 5:13 PM EDT | Severe Thunderstorm Warning | RAH | 47 min |
| Jul 24, 1:12 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Jul 24, 2:24 PM EDT | Severe Thunderstorm Warning | RAH | 66 min |
| Jul 24, 2:36 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 24, 2:55 PM EDT | Severe Thunderstorm Warning | RAH | 50 min |
| Jul 27, 1:54 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 27, 2:27 PM EDT | Severe Thunderstorm Warning | RAH | 29 min |
| Jul 27, 4:52 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Jul 27, 5:32 PM EDT | Severe Thunderstorm Warning | RAH | 58 min |
| Jul 27, 6:19 PM EDT | Severe Thunderstorm Warning | RAH | 56 min |
| Jul 27, 6:24 PM EDT | Severe Thunderstorm Warning | RAH | 66 min |
| Jul 27, 7:35 PM EDT | Severe Thunderstorm Warning | RAH | 40 min |
| Jul 28, 2:18 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 30, 5:48 PM EDT | Special Weather Statement | RAH | 57 min |
| Jul 31, 5:57 AM EDT | Dense Fog Advisory | RAH | 4 hr |
| Aug 8, 2:54 PM EDT | Severe Thunderstorm Warning | RAH | 66 min |
| Aug 8, 3:43 PM EDT | Severe Thunderstorm Warning | RAH | 62 min |
| Aug 10, 12:48 AM EDT | Special Weather Statement | RAH | 87 min |
| Aug 11, 1:05 PM EDT | Special Weather Statement | RAH | 55 min |
| Aug 11, 3:19 PM EDT | Special Weather Statement | RAH | 56 min |
| Aug 15, 2:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Aug 19, 4:26 AM EDT | Special Weather Statement | RAH | 2 hr |
| Aug 19, 4:49 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| Aug 19, 6:04 AM EDT | Special Weather Statement | RAH | 116 min |
| Aug 28, 7:25 PM EDT | Special Weather Statement | RAH | 80 min |
| Aug 28, 8:41 PM EDT | Special Weather Statement | RAH | 2 hr |
| Aug 28, 9:01 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Aug 30, 6:51 AM EDT | Dense Fog Advisory | RAH | 3 hr |
| Sep 2, 12:24 PM EDT | Special Weather Statement | RAH | 66 min |
| Sep 2, 1:37 PM EDT | Special Weather Statement | RAH | 83 min |
| Sep 2, 7:51 PM EDT | Special Weather Statement | RAH | 54 min |
| Sep 2, 8:20 PM EDT | Special Weather Statement | RAH | 85 min |
| Sep 2, 8:28 PM EDT | Severe Thunderstorm Warning | RAH | 53 min |
| Sep 3, 1:52 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Sep 3, 4:03 PM EDT | Special Weather Statement | RAH | 87 min |
| Sep 3, 4:17 PM EDT | Severe Thunderstorm Warning | RAH | 58 min |
| Sep 3, 4:52 PM EDT | Areal Flood Advisory | RAH | 2 hr |
| Sep 4, 2:20 PM EDT | Special Weather Statement | RAH | 55 min |
| Sep 8, 12:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Sep 8, 1:48 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 8, 3:25 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Sep 8, 3:28 PM EDT | Special Weather Statement | RAH | 62 min |
| Sep 8, 4:01 PM EDT | Severe Thunderstorm Warning | RAH | 38 min |
| Sep 18, 8:49 AM EDT | Mesoscale Discussion | SPC | 116 min |
| Sep 18, 8:56 AM EDT | Special Weather Statement | RAH | 94 min |
| Sep 18, 9:34 AM EDT | Severe Thunderstorm Warning | RAH | 56 min |
| Sep 18, 9:45 AM EDT | Tornado Watch | SPC | 8 hr |
| Sep 18, 11:19 AM EDT | Mesoscale Discussion | SPC | 86 min |
| Sep 18, 11:52 AM EDT | Areal Flood Advisory | RAH | 2 hr |
| Sep 18, 1:21 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Sep 18, 2:27 PM EDT | Special Weather Statement | RAH | 63 min |
| Sep 18, 4:11 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Sep 22, 8:56 PM EDT | Special Weather Statement | RAH | 49 min |
| Sep 28, 2:36 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Sep 28, 4:07 PM EDT | Special Weather Statement | RAH | 68 min |
| Sep 28, 5:45 PM EDT | Special Weather Statement | RAH | 45 min |
| Sep 29, 3:27 AM EDT | Special Weather Statement | RAH | 63 min |
| Oct 2, 6:27 AM EDT | Special Weather Statement | RAH | 108 min |
| Oct 7, 7:34 AM EDT | Special Weather Statement | RAH | 56 min |
| Oct 15, 8:43 AM EDT | Special Weather Statement | RAH | 62 min |
| Oct 15, 10:40 AM EDT | Special Weather Statement | RAH | 50 min |
| Oct 18, 8:55 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 19, 2:17 AM EDT | Special Weather Statement | RAH | 88 min |
| Oct 29, 4:12 AM EDT | Wind Advisory | RAH | 31 hr |
| Oct 31, 3:58 AM EDT | Frost Advisory | RAH | 28 hr |
| Nov 1, 3:56 AM EDT | Frost Advisory | RAH | 11 hr |
| Nov 1, 3:24 PM EDT | Freeze Warning | RAH | 17 hr |
| Dec 20, 2:44 PM EST | Wind Advisory | RAH | 28 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 | 25 |
| Severe Thunderstorm Watch | 11 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 39 |
| Special Weather Statement | 67 |
| Flooding | |
| Flash Flood Warning | 1 |
| Areal Flood Advisory | 12 |
| Winter | |
| Winter Weather Advisory | 1 |
| Heat | |
| Excessive Heat Warning | 1 |
| Excessive Heat Watch | 1 |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 1 |
| Frost Advisory | 5 |
| Wind and dust | |
| Wind Advisory | 2 |
| Fire | |
| Red Flag Warning | 3 |
| Fire Weather Watch | 3 |
| Fog and smoke | |
| Dense Fog Advisory | 9 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20112013
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.