Alert archive / North Carolina / Alamance County
Weather alerts in Alamance County, North Carolina, 2018
173 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 173
- Warnings
- 40
- Watches
- 14
- Advisories
- 41
- Busiest month
- September28 alerts
- Busiest day
- July 23, 20186 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, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 16 | 11 | 31% | 13 | 100% | 16 min |
| Flash flood warnings | 4 | 3 | 25% | 5 | 60% | 65 min |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Raleigh, NC: tornado warnings | 28 | 6 | 79% | 16 | 94% | 7 min |
| NWS Raleigh, NC: severe thunderstorm warnings | 231 | 166 | 28% | 427 | 81% | 22 min |
| NWS Raleigh, NC: flash flood warnings | 74 | 57 | 23% | 235 | 93% | 439 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 1, 3:36 PM EST | Wind Chill Advisory | RAH | 17 hr |
| Jan 2, 2:30 PM EST | Winter Weather Advisory | RAH | 4 days |
| Jan 4, 4:05 AM EST | Wind Chill Advisory | RAH | 30 hr |
| Jan 5, 4:04 AM EST | Wind Chill Advisory | RAH | 30 hr |
| Jan 12, 6:46 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Jan 12, 6:58 PM EST | Special Weather Statement | RAH | 92 min |
| Jan 16, 2:55 AM EST | Winter Weather Advisory | RAH | 3 days |
| Jan 16, 2:50 PM EST | Winter Storm Warning | RAH | 32 hr |
| Jan 17, 7:21 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 17, 9:07 AM EST | Special Weather Statement | RAH | 53 min |
| Jan 23, 3:23 AM EST | Special Weather Statement | RAH | 52 min |
| Jan 23, 4:05 AM EST | Special Weather Statement | RAH | 55 min |
| Jan 23, 12:05 PM EST | Wind Advisory | RAH | 6 hr |
| Feb 3, 4:05 AM EST | Winter Weather Advisory | RAH | 32 hr |
| Feb 19, 10:45 PM EST | Dense Fog Advisory | RAH | 13 hr |
| Mar 1, 1:28 PM EST | Wind Advisory | RAH | 32 hr |
| Mar 2, 3:52 AM EST | High Wind Warning | RAH | 17 hr |
| Mar 11, 3:25 PM EDT | Winter Weather Advisory | RAH | 43 hr |
| Mar 15, 9:14 AM EDT | Red Flag Warning | RAH | 10 hr |
| Mar 17, 10:05 PM EDT | Special Weather Statement | RAH | 55 min |
| Mar 20, 9:00 PM EDT | Special Weather Statement | RAH | 90 min |
| Mar 20, 9:34 PM EDT | Winter Weather Advisory | RAH | 13 hr |
| Mar 21, 4:44 AM EDT | Special Weather Statement | RAH | 76 min |
| Mar 24, 3:04 PM EDT | Winter Weather Advisory | RAH | 13 hr |
| Mar 24, 9:36 PM EDT | Winter Storm Warning | RAH | 6 hr |
| Apr 4, 7:43 PM EDT | Freeze Warning | RAH | 12 hr |
| Apr 5, 9:42 PM EDT | Frost Advisory | RAH | 9 hr |
| Apr 7, 4:07 AM EDT | Freeze Warning | RAH | 29 hr |
| Apr 15, 11:30 AM EDT | Flash Flood Watch | RAH | 14 hr |
| Apr 15, 2:29 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Apr 15, 3:02 PM EDT | Tornado Watch | SPC | 8 hr |
| Apr 15, 5:25 PM EDT | Severe Thunderstorm Warning | RAH | 65 min |
| Apr 15, 5:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Apr 15, 8:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Apr 16, 2:58 PM EDT | Frost Advisory | RAH | 18 hr |
| Apr 19, 3:17 AM EDT | Frost Advisory | RAH | 29 hr |
| May 6, 2:07 PM EDT | Special Weather Statement | RAH | 53 min |
| May 6, 2:10 PM EDT | Mesoscale Discussion | SPC | 95 min |
| May 6, 2:46 PM EDT | Special Weather Statement | RAH | 59 min |
| May 10, 3:35 PM EDT | Mesoscale Discussion | SPC | 115 min |
| May 10, 4:23 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 10, 5:00 PM EDT | Special Weather Statement | RAH | 45 min |
| May 10, 5:50 PM EDT | Special Weather Statement | RAH | 55 min |
| May 10, 7:20 PM EDT | Mesoscale Discussion | SPC | 55 min |
| May 16, 6:06 PM EDT | Special Weather Statement | RAH | 54 min |
| May 18, 2:41 PM EDT | Flash Flood Watch | RAH | 28 hr |
| May 18, 4:06 PM EDT | Special Weather Statement | RAH | 54 min |
| May 20, 4:39 PM EDT | Areal Flood Advisory | RAH | 95 min |
| May 21, 2:47 PM EDT | Special Weather Statement | RAH | 28 min |
| May 21, 4:33 PM EDT | Areal Flood Advisory | RAH | 2 hr |
| May 21, 4:44 PM EDT | Special Weather Statement | RAH | 61 min |
| May 21, 5:04 PM EDT | Severe Thunderstorm Warning | RAH | 28 min |
| May 23, 3:20 PM EDT | Special Weather Statement | RAH | 55 min |
| May 23, 3:51 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 26, 3:35 PM EDT | Special Weather Statement | RAH | 55 min |
| May 27, 4:40 AM EDT | Flash Flood Watch | RAH | 47 hr |
| Jun 1, 7:09 PM EDT | Special Weather Statement | RAH | 36 min |
| Jun 1, 7:22 PM EDT | Special Weather Statement | RAH | 53 min |
| Jun 1, 7:49 PM EDT | Severe Thunderstorm Warning | RAH | 44 min |
| Jun 2, 4:47 PM EDT | Special Weather Statement | RAH | 58 min |
| Jun 3, 9:02 PM EDT | Special Weather Statement | RAH | 88 min |
| Jun 10, 3:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 14, 5:44 PM EDT | Special Weather Statement | RAH | 46 min |
| Jun 14, 6:18 PM EDT | Special Weather Statement | RAH | 27 min |
| Jun 20, 8:41 PM EDT | Special Weather Statement | RAH | 49 min |
| Jun 22, 3:19 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jun 24, 7:23 PM EDT | Special Weather Statement | RAH | 52 min |
| Jul 4, 7:17 PM EDT | Severe Thunderstorm Warning | RAH | 31 min |
| Jul 4, 7:44 PM EDT | Areal Flood Advisory | RAH | 89 min |
| Jul 6, 1:42 PM EDT | Special Weather Statement | RAH | 48 min |
| Jul 6, 2:40 PM EDT | Special Weather Statement | RAH | 65 min |
| Jul 6, 3:18 PM EDT | Severe Thunderstorm Warning | RAH | 42 min |
| Jul 17, 5:44 PM EDT | Severe Thunderstorm Warning | RAH | 61 min |
| Jul 21, 11:22 PM EDT | Special Weather Statement | RAH | 53 min |
| Jul 22, 12:26 AM EDT | Special Weather Statement | RAH | 79 min |
| Jul 22, 12:35 AM EDT | Areal Flood Advisory | RAH | 2 hr |
| Jul 22, 7:18 PM EDT | Severe Thunderstorm Warning | RAH | 72 min |
| Jul 22, 8:19 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jul 22, 8:37 PM EDT | Special Weather Statement | RAH | 68 min |
| Jul 23, 3:14 AM EDT | Flash Flood Watch | RAH | 47 hr |
| Jul 23, 1:24 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 23, 4:25 PM EDT | Special Weather Statement | RAH | 50 min |
| Jul 23, 5:11 PM EDT | Special Weather Statement | RAH | 64 min |
| Jul 25, 5:58 PM EDT | Special Weather Statement | RAH | 62 min |
| Aug 1, 7:26 PM EDT | Areal Flood Advisory | RAH | 2 hr |
| Aug 1, 8:08 PM EDT | Special Weather Statement | RAH | 67 min |
| Aug 1, 9:43 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Aug 1, 10:20 PM EDT | Flash Flood Watch | RAH | 46 hr |
| Aug 2, 11:35 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| Aug 3, 4:59 PM EDT | Areal Flood Advisory | RAH | 2 hr |
| Aug 3, 5:06 PM EDT | Flash Flood Warning | RAH | 3 hr |
| Aug 3, 6:44 PM EDT | River Flood Warning | RAH | 15 hr |
| Aug 7, 6:48 PM EDT | Special Weather Statement | RAH | 57 min |
| Aug 7, 7:32 PM EDT | Severe Thunderstorm Warning | RAH | 44 min |
| Aug 7, 10:11 PM EDT | Severe Thunderstorm Warning | RAH | 64 min |
| Aug 8, 4:24 PM EDT | Special Weather Statement | RAH | 66 min |
| Aug 8, 4:54 PM EDT | Severe Thunderstorm Warning | RAH | 66 min |
| Aug 8, 6:15 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Aug 11, 1:27 AM EDT | Special Weather Statement | RAH | 63 min |
| Aug 11, 2:56 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 13, 11:28 PM EDT | Special Weather Statement | RAH | 62 min |
| Aug 18, 2:45 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 18, 5:06 PM EDT | Special Weather Statement | RAH | 54 min |
| Aug 20, 1:38 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| Aug 22, 12:07 AM EDT | Special Weather Statement | RAH | 53 min |
| Aug 30, 6:11 PM EDT | Special Weather Statement | RAH | 34 min |
| Aug 30, 11:45 PM EDT | Special Weather Statement | RAH | 45 min |
| Aug 31, 1:16 AM EDT | Special Weather Statement | RAH | 89 min |
| Sep 1, 4:55 PM EDT | Special Weather Statement | RAH | 65 min |
| Sep 1, 5:15 PM EDT | Severe Thunderstorm Warning | RAH | 60 min |
| Sep 1, 5:36 PM EDT | Severe Thunderstorm Warning | RAH | 54 min |
| Sep 1, 6:28 PM EDT | Severe Thunderstorm Warning | RAH | 62 min |
| Sep 1, 6:33 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Sep 12, 4:35 AM EDT | Flash Flood Watch | RAH | 5 days |
| Sep 14, 5:50 PM EDT | Areal Flood Advisory | RAH | 4 hr |
| Sep 14, 6:57 PM EDT | Flash Flood Warning | RAH | 4 hr |
| Sep 14, 7:09 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 15, 2:43 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| Sep 15, 6:06 AM EDT | Areal Flood Advisory | RAH | 6 hr |
| Sep 15, 1:40 PM EDT | Areal Flood Advisory | RAH | 4 hr |
| Sep 16, 8:13 AM EDT | Areal Flood Advisory | RAH | 6 hr |
| Sep 16, 4:22 PM EDT | Flash Flood Warning | RAH | 20 hr |
| Sep 16, 9:12 PM EDT | Special Weather Statement | RAH | 48 min |
| Sep 16, 10:27 PM EDT | Special Weather Statement | RAH | 78 min |
| Sep 17, 4:46 AM EDT | River Flood Warning | RAH | 47 hr |
| Sep 17, 11:53 AM EDT | Areal Flood Warning | RAH | 6 hr |
| Sep 17, 2:49 PM EDT | Special Weather Statement | RAH | 56 min |
| Sep 17, 5:45 PM EDT | Areal Flood Warning | RAH | 3 hr |
| Sep 17, 8:09 PM EDT | Areal Flood Warning | RAH | 24 hr |
| Sep 18, 4:01 PM EDT | Areal Flood Warning | RAH | 53 hr |
| Sep 26, 6:06 PM EDT | Special Weather Statement | RAH | 69 min |
| Sep 26, 6:17 PM EDT | Severe Thunderstorm Warning | RAH | 39 min |
| Sep 27, 2:20 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 27, 5:47 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Sep 27, 10:42 PM EDT | Severe Thunderstorm Warning | RAH | 63 min |
| Sep 27, 11:38 PM EDT | Special Weather Statement | RAH | 52 min |
| Oct 9, 4:04 PM EDT | Flash Flood Watch | RAH | 52 hr |
| Oct 10, 11:02 AM EDT | Tropical Storm Warning | RAH | 36 hr |
| Oct 10, 10:33 PM EDT | River Flood Warning | RAH | 60 hr |
| Oct 11, 8:31 AM EDT | Mesoscale Discussion | SPC | 89 min |
| Oct 11, 9:58 AM EDT | Tornado Watch | SPC | 13 hr |
| Oct 11, 11:17 AM EDT | Areal Flood Advisory | RAH | 6 hr |
| Oct 11, 12:25 PM EDT | Flash Flood Warning | RAH | 9 hr |
| Oct 11, 3:56 PM EDT | Severe Thunderstorm Warning | RAH | 64 min |
| Oct 21, 3:56 AM EDT | Frost Advisory | RAH | 29 hr |
| Oct 21, 8:53 PM EDT | Freeze Warning | RAH | 12 hr |
| Nov 2, 3:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Nov 2, 6:02 PM EDT | Special Weather Statement | RAH | 28 min |
| Nov 6, 4:36 AM EST | Dense Fog Advisory | RAH | 115 min |
| Nov 6, 11:21 AM EST | Special Weather Statement | RAH | 54 min |
| Nov 6, 12:26 PM EST | Special Weather Statement | RAH | 64 min |
| Nov 6, 1:44 PM EST | Special Weather Statement | RAH | 61 min |
| Nov 9, 10:46 AM EST | Freeze Watch | RAH | 17 hr |
| Nov 10, 3:36 AM EST | Freeze Warning | RAH | 29 hr |
| Nov 12, 9:47 PM EST | River Flood Warning | RAH | 37 hr |
| Nov 12, 10:07 PM EST | Areal Flood Advisory | RAH | 9 hr |
| Nov 14, 3:36 AM EST | Flood Watch | RAH | 35 hr |
| Nov 15, 6:18 PM EST | River Flood Warning | RAH | 11 hr |
| Nov 25, 2:37 AM EST | Dense Fog Advisory | RAH | 6 hr |
| Dec 6, 3:41 PM EST | Winter Storm Watch | RAH | 36 hr |
| Dec 7, 3:54 PM EST | Winter Storm Warning | RAH | 60 hr |
| Dec 8, 3:45 AM EST | Winter Weather Advisory | RAH | 3 days |
| Dec 9, 3:08 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 9, 8:18 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 9, 12:34 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 11, 3:00 PM EST | Winter Weather Advisory | RAH | 19 hr |
| Dec 13, 3:33 AM EST | Flash Flood Watch | RAH | 59 hr |
| Dec 21, 2:40 AM EST | River Flood Warning | RAH | 10 hr |
| Dec 21, 2:33 PM EST | Mesoscale Discussion | SPC | 57 min |
| Dec 21, 3:25 PM EST | Special Weather Statement | RAH | 50 min |
| Dec 21, 4:18 PM EST | Special Weather Statement | RAH | 57 min |
| Dec 28, 8:57 PM EST | Dense Fog Advisory | RAH | 10 hr |
| Dec 31, 5:18 AM EST | Dense Fog Advisory | RAH | 4 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 | 16 |
| Severe Thunderstorm Watch | 1 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 23 |
| Special Weather Statement | 55 |
| Flooding | |
| Areal Flood Warning | 4 |
| Flash Flood Warning | 4 |
| River Flood Warning | 6 |
| Flash Flood Watch | 8 |
| Flood Watch | 1 |
| Areal Flood Advisory | 19 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 8 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 1 |
| Frost Advisory | 4 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 2 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
| Tropical | |
| Tropical Storm Warning | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.