Alert archive / North Carolina / Durham County
Weather alerts in Durham County, North Carolina, 2009
126 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Durham County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 126
- Warnings
- 27
- Watches
- 24
- Advisories
- 41
- Busiest month
- May29 alerts
- Busiest day
- May 9, 20096 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado warnings covering Durham County in 2009 had a tornado report inside them.
Durham County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 17 | 9 | 47% | 9 | 78% | 34 min |
| Flash flood warnings | 2 | 2 | 0% | 1 | 100% | 70 min |
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 2, 9:10 AM EST | Winter Weather Advisory | RAH | 2 hr |
| Jan 3, 2:06 AM EST | Dense Fog Advisory | RAH | 9 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 15, 3:12 PM EST | Wind Chill Advisory | RAH | 18 hr |
| 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 19, 2:31 PM EST | Winter Weather Advisory | RAH | 22 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 |
| 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 |
| Feb 28, 4:24 AM EST | Winter Storm Watch | RAH | 24 hr |
| Feb 28, 10:17 PM EST | Winter Storm Warning | RAH | 33 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 26, 5:52 AM EDT | Dense Fog Advisory | RAH | 4 hr |
| Mar 26, 10:41 AM EDT | Dense Fog Advisory | RAH | 79 min |
| Mar 27, 5:34 AM EDT | Dense Fog Advisory | RAH | 4 hr |
| Apr 1, 10:18 PM EDT | Dense Fog Advisory | RAH | 12 hr |
| Apr 3, 4:10 AM EDT | Wind Advisory | RAH | 16 hr |
| Apr 6, 3:47 PM EDT | Freeze Watch | RAH | 24 hr |
| Apr 7, 3:30 PM EDT | Freeze Warning | RAH | 16 hr |
| Apr 16, 3:30 PM EDT | Frost Advisory | RAH | 18 hr |
| Apr 20, 2:09 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 20, 2:50 PM EDT | Tornado Watch | SPC | 7 hr |
| Apr 20, 3:35 PM EDT | Severe Thunderstorm Warning | RAH | 40 min |
| Apr 20, 4:17 PM EDT | Severe Thunderstorm Warning | RAH | 58 min |
| Apr 20, 4:57 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Apr 21, 2:12 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 22, 10:01 AM EDT | Red Flag Warning | RAH | 8 hr |
| May 1, 1:03 PM EDT | Mesoscale Discussion | SPC | 117 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 5, 5:21 PM EDT | Severe Thunderstorm Warning | RAH | 39 min |
| May 5, 5:37 PM EDT | Mesoscale Discussion | SPC | 53 min |
| May 5, 5:41 PM EDT | Tornado Warning | RAH | 49 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, 7:29 PM EDT | Mesoscale Discussion | SPC | 91 min |
| May 6, 8:26 PM EDT | Tornado Watch | SPC | 8 hr |
| May 6, 10:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| May 7, 12:10 AM EDT | Mesoscale Discussion | SPC | 95 min |
| May 7, 5:17 AM EDT | Mesoscale Discussion | SPC | 118 min |
| May 7, 3:03 PM EDT | Mesoscale Discussion | SPC | 117 min |
| May 9, 12:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| May 9, 1:17 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 9, 4:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| May 9, 5:46 PM EDT | Severe Thunderstorm Warning | RAH | 59 min |
| May 9, 5:58 PM EDT | Mesoscale Discussion | SPC | 62 min |
| May 9, 6:00 PM EDT | Severe Thunderstorm Warning | RAH | 60 min |
| May 12, 5:33 AM EDT | Dense Fog Advisory | RAH | 3 hr |
| May 28, 3:49 PM EDT | Mesoscale Discussion | SPC | 56 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 31, 2:48 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jun 2, 5:06 PM EDT | Severe Thunderstorm Warning | RAH | 29 min |
| Jun 3, 5:38 PM EDT | Severe Thunderstorm Warning | RAH | 38 min |
| Jun 4, 11:21 AM EDT | Flash Flood Watch | RAH | 28 hr |
| Jun 4, 2:52 PM EDT | Tornado Watch | SPC | 4 hr |
| Jun 8, 5:03 AM EDT | Dense Fog Advisory | RAH | 4 hr |
| Jun 9, 2:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 9, 10:46 PM EDT | Severe Thunderstorm Warning | RAH | 39 min |
| Jun 9, 11:12 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jun 11, 6:20 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 11, 8:24 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Jun 16, 4:20 AM EDT | Flash Flood Watch | RAH | 9 hr |
| Jun 16, 6:08 AM EDT | Flash Flood Warning | RAH | 3 hr |
| Jun 27, 2:06 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jul 12, 12:21 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jul 12, 7:23 PM EDT | Severe Thunderstorm Warning | RAH | 28 min |
| Jul 17, 9:52 AM EDT | Mesoscale Discussion | SPC | 83 min |
| Jul 17, 10:29 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 17, 12:59 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Jul 17, 1:56 PM EDT | Severe Thunderstorm Warning | RAH | 35 min |
| Jul 20, 4:47 PM EDT | Severe Thunderstorm Warning | RAH | 43 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 28, 7:08 PM EDT | Severe Thunderstorm Warning | RAH | 82 min |
| Jul 31, 2:25 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 31, 6:54 PM EDT | Mesoscale Discussion | SPC | 66 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, 5:32 PM EDT | Severe Thunderstorm Warning | RAH | 43 min |
| Aug 11, 5:51 PM EDT | Severe Thunderstorm Warning | RAH | 47 min |
| Aug 14, 5:32 PM EDT | Areal Flood Advisory | RAH | 74 min |
| Aug 16, 3:41 PM EDT | Areal Flood Advisory | RAH | 58 min |
| Aug 17, 2:48 PM EDT | Severe Thunderstorm Warning | RAH | 42 min |
| Sep 19, 12:48 AM EDT | Dense Fog Advisory | RAH | 8 hr |
| Sep 22, 5:33 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Sep 28, 4:44 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Sep 28, 5:47 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Sep 28, 6:13 PM EDT | Severe Thunderstorm Warning | RAH | 62 min |
| Sep 28, 6:24 PM EDT | Severe Thunderstorm Warning | RAH | 40 min |
| Oct 18, 2:37 AM EDT | Frost Advisory | RAH | 30 hr |
| Oct 19, 2:05 AM EDT | Frost Advisory | RAH | 31 hr |
| Oct 24, 12:19 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Nov 3, 9:56 PM EST | Frost Advisory | RAH | 11 hr |
| Nov 5, 2:52 PM EST | Frost Advisory | RAH | 18 hr |
| 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, 8:14 AM EST | Areal Flood Advisory | RAH | 6 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, 6:55 PM EST | Areal Flood Advisory | RAH | 4 hr |
| Dec 2, 8:31 PM EST | Mesoscale Discussion | SPC | 89 min |
| Dec 2, 9:01 PM EST | Tornado Watch | SPC | 6 hr |
| Dec 2, 9:50 PM EST | Flash Flood Warning | RAH | 3 hr |
| Dec 3, 12:12 AM EST | Mesoscale Discussion | SPC | 93 min |
| Dec 8, 9:10 PM EST | Wind Advisory | RAH | 24 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, 3:44 AM EST | Winter Storm Watch | RAH | 13 hr |
| Dec 17, 4:25 PM EST | Winter Storm Warning | RAH | 40 hr |
| Dec 17, 4:25 PM EST | Winter Weather Advisory | RAH | 44 hr |
| Dec 30, 9:59 PM EST | Winter Weather Advisory | RAH | 8 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 | 17 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 9 |
| Tornado Watch | 6 |
| Mesoscale Discussion | 34 |
| Flooding | |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 3 |
| Areal Flood Advisory | 6 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 8 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 2 |
| Frost Advisory | 5 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 4 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 16 |
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.