Alert archive / North Carolina / Chatham County
Weather alerts in Chatham County, North Carolina, 2015
164 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Chatham County and its neighbors
Each county as a circle sized by its count in 2015. Tap one for its archive.
- Alerts
- 164
- Warnings
- 55
- Watches
- 13
- Advisories
- 40
- Busiest month
- June45 alerts
- Busiest day
- June 27, 201516 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 2 tornado warnings covering Chatham County in 2015 had a tornado report inside them.
Chatham County, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 1 | 50% | 0 | ||
| Severe thunderstorm warnings | 35 | 24 | 31% | 19 | 89% | 21 min |
| Flash flood warnings | 5 | 4 | 20% | 0 |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Raleigh, NC: tornado warnings | 5 | 1 | 80% | 1 | 100% | 3 min |
| NWS Raleigh, NC: severe thunderstorm warnings | 225 | 162 | 28% | 375 | 90% | 21 min |
| NWS Raleigh, NC: flash flood warnings | 35 | 24 | 31% | 49 | 88% | 73 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, 9:32 PM EST | Dense Fog Advisory | RAH | 9 hr |
| Jan 4, 11:18 AM EST | Special Weather Statement | RAH | 117 min |
| Jan 7, 4:17 AM EST | Wind Chill Advisory | RAH | 30 hr |
| Jan 13, 4:36 AM EST | Winter Weather Advisory | RAH | 31 hr |
| Jan 15, 5:29 AM EST | Dense Fog Advisory | RAH | 5 hr |
| Feb 2, 4:01 AM EST | Wind Advisory | RAH | 15 hr |
| Feb 14, 4:21 AM EST | Red Flag Warning | RAH | 14 hr |
| Feb 14, 4:59 AM EST | Wind Advisory | RAH | 25 hr |
| Feb 14, 3:28 PM EST | Wind Chill Advisory | RAH | 18 hr |
| Feb 15, 4:18 PM EST | Winter Storm Warning | RAH | 41 hr |
| Feb 16, 4:50 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 17, 2:58 PM EST | Winter Weather Advisory | RAH | 19 hr |
| Feb 18, 3:57 AM EST | Wind Chill Advisory | RAH | 53 hr |
| Feb 18, 4:06 PM EST | Winter Weather Advisory | RAH | 17 hr |
| Feb 24, 4:22 AM EST | Winter Weather Advisory | RAH | 31 hr |
| Feb 24, 4:38 PM EST | Winter Storm Watch | RAH | 12 hr |
| Feb 25, 4:28 AM EST | Winter Storm Warning | RAH | 32 hr |
| Feb 25, 7:55 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 26, 1:56 PM EST | Winter Weather Advisory | RAH | 20 hr |
| Feb 28, 3:49 PM EST | Winter Weather Advisory | RAH | 24 hr |
| Mar 1, 3:26 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Mar 2, 2:57 AM EST | Dense Fog Advisory | RAH | 6 hr |
| Mar 4, 4:27 AM EST | Dense Fog Advisory | RAH | 7 hr |
| Mar 5, 3:44 AM EST | Winter Weather Advisory | RAH | 29 hr |
| Apr 3, 2:59 PM EDT | Fire Weather Watch | RAH | 16 hr |
| Apr 4, 2:33 PM EDT | Freeze Warning | RAH | 17 hr |
| Apr 9, 3:38 AM EDT | Special Weather Statement | RAH | 52 min |
| Apr 9, 4:45 AM EDT | Special Weather Statement | RAH | 60 min |
| Apr 9, 5:06 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Apr 9, 5:16 PM EDT | Severe Thunderstorm Warning | RAH | 35 min |
| Apr 9, 5:27 PM EDT | Special Weather Statement | RAH | 63 min |
| Apr 9, 5:50 PM EDT | Special Weather Statement | RAH | 55 min |
| Apr 9, 6:30 PM EDT | Severe Thunderstorm Warning | RAH | 60 min |
| Apr 9, 6:49 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Apr 9, 7:03 PM EDT | Flash Flood Warning | RAH | 3 hr |
| Apr 9, 7:13 PM EDT | Severe Thunderstorm Warning | RAH | 62 min |
| Apr 9, 7:46 PM EDT | Special Weather Statement | RAH | 44 min |
| Apr 9, 9:26 PM EDT | Severe Thunderstorm Warning | RAH | 34 min |
| Apr 14, 4:29 PM EDT | Mesoscale Discussion | SPC | 46 min |
| Apr 14, 4:33 PM EDT | Special Weather Statement | RAH | 27 min |
| Apr 14, 5:07 PM EDT | Special Weather Statement | RAH | 23 min |
| Apr 19, 5:01 PM EDT | Tornado Watch | SPC | 6 hr |
| Apr 19, 8:24 PM EDT | Special Weather Statement | RAH | 51 min |
| Apr 20, 2:55 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 20, 3:09 PM EDT | Severe Thunderstorm Warning | RAH | 31 min |
| Apr 20, 3:11 PM EDT | Special Weather Statement | RAH | 64 min |
| Apr 20, 3:20 PM EDT | Severe Thunderstorm Warning | RAH | 25 min |
| Apr 20, 6:10 PM EDT | Special Weather Statement | RAH | 50 min |
| Apr 20, 6:27 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Apr 20, 6:44 PM EDT | Severe Thunderstorm Warning | RAH | 46 min |
| Apr 20, 6:56 PM EDT | Severe Thunderstorm Warning | RAH | 49 min |
| Apr 20, 11:37 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Apr 30, 5:52 PM EDT | Special Weather Statement | RAH | 53 min |
| May 1, 4:45 AM EDT | Special Weather Statement | RAH | 45 min |
| May 1, 5:44 AM EDT | Special Weather Statement | RAH | 61 min |
| May 1, 6:50 AM EDT | Special Weather Statement | RAH | 55 min |
| May 1, 7:15 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| May 11, 3:24 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 12, 1:52 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 1, 2:29 PM EDT | Special Weather Statement | RAH | 61 min |
| Jun 9, 1:31 AM EDT | Special Weather Statement | RAH | 59 min |
| Jun 9, 2:32 AM EDT | Special Weather Statement | RAH | 73 min |
| Jun 15, 3:11 AM EDT | Heat Advisory | RAH | 16 hr |
| Jun 15, 3:11 PM EDT | Heat Advisory | RAH | 28 hr |
| Jun 17, 3:40 PM EDT | Heat Advisory | RAH | 27 hr |
| Jun 18, 1:32 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 18, 10:15 PM EDT | Areal Flood Advisory | RAH | 2 hr |
| Jun 19, 4:33 PM EDT | Severe Thunderstorm Warning | RAH | 45 min |
| Jun 20, 3:26 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jun 20, 6:24 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 25, 4:12 AM EDT | Special Weather Statement | RAH | 48 min |
| Jun 25, 4:31 AM EDT | Flash Flood Warning | RAH | 3 hr |
| Jun 25, 4:35 AM EDT | Severe Thunderstorm Warning | RAH | 55 min |
| Jun 25, 5:14 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jun 25, 5:38 AM EDT | Special Weather Statement | RAH | 67 min |
| Jun 25, 7:37 PM EDT | Severe Thunderstorm Warning | RAH | 53 min |
| Jun 25, 8:14 PM EDT | Severe Thunderstorm Warning | RAH | 61 min |
| Jun 26, 3:29 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 4:03 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 26, 4:59 PM EDT | Severe Thunderstorm Warning | RAH | 25 min |
| Jun 26, 5:39 PM EDT | Special Weather Statement | RAH | 51 min |
| Jun 26, 5:55 PM EDT | Severe Thunderstorm Warning | RAH | 35 min |
| Jun 26, 6:11 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jun 26, 10:47 PM EDT | Special Weather Statement | RAH | 58 min |
| Jun 26, 11:00 PM EDT | Severe Thunderstorm Warning | RAH | 60 min |
| Jun 26, 11:16 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jun 27, 2:07 AM EDT | Flash Flood Watch | RAH | 20 hr |
| Jun 27, 2:06 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 27, 4:38 PM EDT | Special Weather Statement | RAH | 67 min |
| Jun 27, 4:44 PM EDT | Severe Thunderstorm Warning | RAH | 46 min |
| Jun 27, 5:27 PM EDT | Severe Thunderstorm Warning | RAH | 48 min |
| Jun 27, 5:43 PM EDT | Tornado Warning | RAH | 22 min |
| Jun 27, 6:14 PM EDT | Severe Thunderstorm Warning | RAH | 46 min |
| Jun 27, 6:22 PM EDT | Tornado Warning | RAH | 13 min |
| Jun 27, 6:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 27, 6:26 PM EDT | Special Weather Statement | RAH | 49 min |
| Jun 27, 6:43 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jun 27, 6:57 PM EDT | Severe Thunderstorm Warning | RAH | 63 min |
| Jun 27, 7:39 PM EDT | Areal Flood Advisory | RAH | 2 hr |
| Jun 30, 1:38 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 30, 3:34 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 30, 4:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 30, 6:06 PM EDT | Severe Thunderstorm Warning | RAH | 39 min |
| Jun 30, 6:33 PM EDT | Severe Thunderstorm Warning | RAH | 57 min |
| Jul 1, 7:50 PM EDT | Severe Thunderstorm Warning | RAH | 55 min |
| Jul 4, 1:20 PM EDT | Special Weather Statement | RAH | 55 min |
| Jul 5, 6:35 PM EDT | Special Weather Statement | RAH | 55 min |
| Jul 5, 7:32 PM EDT | Severe Thunderstorm Warning | RAH | 43 min |
| Jul 5, 8:01 PM EDT | Areal Flood Advisory | RAH | 119 min |
| Jul 5, 8:06 PM EDT | Severe Thunderstorm Warning | RAH | 39 min |
| Jul 8, 7:36 PM EDT | Severe Thunderstorm Warning | RAH | 54 min |
| Jul 8, 8:03 PM EDT | Severe Thunderstorm Warning | RAH | 42 min |
| Jul 8, 8:19 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jul 13, 6:23 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 13, 9:42 PM EDT | Severe Thunderstorm Warning | RAH | 67 min |
| Jul 13, 10:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jul 18, 2:05 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 21, 6:48 PM EDT | Severe Thunderstorm Warning | RAH | 57 min |
| Jul 21, 7:20 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Aug 6, 2:26 PM EDT | Special Weather Statement | RAH | 64 min |
| Aug 6, 3:36 PM EDT | Severe Thunderstorm Warning | RAH | 39 min |
| Aug 11, 7:09 PM EDT | Special Weather Statement | RAH | 66 min |
| Aug 11, 7:30 PM EDT | Severe Thunderstorm Warning | RAH | 48 min |
| Aug 19, 7:56 PM EDT | Special Weather Statement | RAH | 49 min |
| Sep 4, 1:42 PM EDT | Special Weather Statement | RAH | 63 min |
| Sep 4, 3:33 PM EDT | Severe Thunderstorm Warning | RAH | 42 min |
| Sep 8, 5:20 AM EDT | Dense Fog Advisory | RAH | 4 hr |
| Sep 10, 5:03 PM EDT | Special Weather Statement | RAH | 57 min |
| Sep 10, 5:11 PM EDT | Severe Thunderstorm Warning | RAH | 49 min |
| Sep 10, 5:42 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 10, 6:59 PM EDT | Severe Thunderstorm Warning | RAH | 46 min |
| Sep 10, 7:41 PM EDT | Severe Thunderstorm Warning | RAH | 26 min |
| Sep 30, 3:03 PM EDT | Flash Flood Watch | RAH | 5 days |
| Oct 1, 12:09 PM EDT | River Flood Warning | RAH | 4 days |
| Oct 2, 7:10 AM EDT | Wind Advisory | RAH | 3 days |
| Oct 2, 10:08 PM EDT | Areal Flood Advisory | RAH | 4 hr |
| Oct 2, 10:15 PM EDT | Areal Flood Advisory | RAH | 5 hr |
| Oct 3, 3:56 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| Oct 17, 2:42 PM EDT | Frost Advisory | RAH | 18 hr |
| Oct 17, 2:42 PM EDT | Freeze Watch | RAH | 24 hr |
| Oct 18, 3:06 PM EDT | Freeze Warning | RAH | 18 hr |
| Oct 28, 6:15 PM EDT | Special Weather Statement | RAH | 60 min |
| Nov 2, 10:41 AM EST | Flash Flood Watch | RAH | 17 hr |
| Nov 19, 6:42 PM EST | River Flood Warning | RAH | 18 hr |
| Dec 1, 6:14 PM EST | Dense Fog Advisory | RAH | 16 hr |
| Dec 8, 1:08 AM EST | Dense Fog Advisory | RAH | 11 hr |
| Dec 8, 10:53 PM EST | Dense Fog Advisory | RAH | 12 hr |
| Dec 10, 1:56 AM EST | Dense Fog Advisory | RAH | 4 hr |
| Dec 12, 5:06 AM EST | Dense Fog Advisory | RAH | 5 hr |
| Dec 13, 5:03 AM EST | Dense Fog Advisory | RAH | 6 hr |
| Dec 22, 7:23 AM EST | Areal Flood Advisory | RAH | 3 hr |
| Dec 22, 2:14 PM EST | River Flood Warning | RAH | 18 hr |
| Dec 23, 8:24 AM EST | River Flood Warning | RAH | 49 hr |
| Dec 23, 2:21 PM EST | Mesoscale Discussion | SPC | 84 min |
| Dec 23, 2:27 PM EST | River Flood Warning | RAH | 33 hr |
| Dec 23, 4:47 PM EST | Special Weather Statement | RAH | 58 min |
| Dec 23, 5:09 PM EST | Severe Thunderstorm Warning | RAH | 51 min |
| Dec 25, 4:33 AM EST | River Flood Warning | RAH | 26 hr |
| Dec 29, 3:07 PM EST | Flood Watch | RAH | 35 hr |
| Dec 30, 11:33 AM EST | Flash Flood Warning | RAH | 4 hr |
| Dec 30, 2:09 PM EST | Flash Flood Warning | RAH | 5 hr |
| Dec 30, 3:28 PM EST | Flash Flood Warning | RAH | 3 hr |
| Dec 30, 3:38 PM EST | River Flood Warning | RAH | 42 hr |
| Dec 31, 3:53 AM EST | River Flood Warning | RAH | 21 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 | 35 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 23 |
| Special Weather Statement | 33 |
| Flooding | |
| Flash Flood Warning | 5 |
| River Flood Warning | 8 |
| Flash Flood Watch | 3 |
| Flood Watch | 1 |
| Areal Flood Advisory | 12 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 7 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 1 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 11 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20142016
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.