Alert archive / North Carolina / Forsyth County
Weather alerts in Forsyth County, North Carolina, 2010
185 weather alerts in 2010, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Forsyth County and its neighbors
Each county as a circle sized by its count in 2010. Tap one for its archive.
- Alerts
- 185
- Warnings
- 42
- Watches
- 22
- Advisories
- 46
- Busiest month
- July29 alerts
- Busiest day
- October 27, 201021 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 7 tornado warnings covering Forsyth County in 2010 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 24 minutes after it went out.
Forsyth County, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 7 | 1 | 86% | 1 | 100% | 24 min |
| Severe thunderstorm warnings | 18 | 14 | 22% | 31 | 77% | 23 min |
| Flash flood warnings | 11 | 8 | 27% | 9 | 100% | 76 min |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Raleigh, NC: tornado warnings | 27 | 9 | 67% | 21 | 100% | 19 min |
| NWS Raleigh, NC: severe thunderstorm warnings | 259 | 187 | 28% | 476 | 87% | 22 min |
| NWS Raleigh, NC: flash flood warnings | 73 | 40 | 45% | 112 | 83% | 86 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, 1:56 AM EST | Dense Fog Advisory | RAH | 7 hr |
| Jan 23, 3:51 PM EST | Flash Flood Watch | RAH | 40 hr |
| Jan 24, 9:35 PM EST | Wind Advisory | RAH | 10 hr |
| Jan 24, 11:06 PM EST | Flash Flood Warning | RAH | 4 hr |
| Jan 24, 11:33 PM EST | Tornado Watch | SPC | 7 hr |
| Jan 27, 3:57 PM EST | Winter Storm Watch | RAH | 36 hr |
| Jan 28, 4:14 PM EST | Winter Storm Warning | RAH | 52 hr |
| Jan 29, 9:06 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 30, 8:03 PM EST | Winter Weather Advisory | RAH | 7 hr |
| Jan 31, 2:21 PM EST | Winter Weather Advisory | RAH | 22 hr |
| Feb 1, 3:37 PM EST | Winter Weather Advisory | RAH | 19 hr |
| Feb 4, 4:00 AM EST | Winter Storm Watch | RAH | 11 hr |
| Feb 4, 2:55 PM EST | Flood Watch | RAH | 33 hr |
| Feb 4, 2:55 PM EST | Winter Weather Advisory | RAH | 25 hr |
| Feb 5, 7:08 AM EST | Winter Storm Warning | RAH | 4 hr |
| Feb 5, 2:38 PM EST | Areal Flood Advisory | RAH | 4 hr |
| Feb 5, 3:36 PM EST | Winter Weather Advisory | RAH | 23 hr |
| Feb 5, 6:11 PM EST | Areal Flood Advisory | RAH | 4 hr |
| Feb 5, 10:04 PM EST | Areal Flood Advisory | RAH | 4 hr |
| Feb 5, 10:10 PM EST | Areal Flood Advisory | RAH | 4 hr |
| Feb 8, 9:42 PM EST | Winter Weather Advisory | RAH | 12 hr |
| Feb 9, 4:39 AM EST | High Wind Watch | RAH | 10 hr |
| Feb 9, 2:25 PM EST | High Wind Warning | RAH | 30 hr |
| Feb 12, 3:58 AM EST | Winter Weather Advisory | RAH | 30 hr |
| Feb 13, 11:40 AM EST | Winter Weather Advisory | RAH | 22 hr |
| Feb 23, 2:27 AM EST | Dense Fog Advisory | RAH | 5 hr |
| Feb 23, 3:36 PM EST | Winter Weather Advisory | RAH | 41 hr |
| Mar 2, 4:00 AM EST | Winter Weather Advisory | RAH | 26 hr |
| Mar 2, 2:46 PM EST | Winter Storm Warning | RAH | 15 hr |
| Mar 11, 3:58 AM EST | Dense Fog Advisory | RAH | 5 hr |
| Mar 28, 7:00 PM EDT | Tornado Warning | RAH | 16 min |
| Mar 28, 7:14 PM EDT | Tornado Warning | RAH | 61 min |
| Mar 28, 7:19 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Mar 28, 7:37 PM EDT | Tornado Watch | SPC | 4 hr |
| Mar 28, 8:12 PM EDT | Tornado Warning | RAH | 48 min |
| Mar 28, 8:39 PM EDT | Areal Flood Advisory | RAH | 4 hr |
| Mar 28, 8:45 PM EDT | Tornado Warning | RAH | 29 min |
| Mar 28, 10:13 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Mar 29, 12:25 AM EDT | Mesoscale Discussion | SPC | 95 min |
| Apr 8, 6:37 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Apr 8, 7:12 PM EDT | Tornado Watch | SPC | 3 hr |
| Apr 8, 7:15 PM EDT | Severe Thunderstorm Warning | RAH | 35 min |
| Apr 10, 9:24 PM EDT | Frost Advisory | RAH | 10 hr |
| Apr 25, 2:53 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Apr 28, 2:54 PM EDT | Frost Advisory | RAH | 17 hr |
| May 7, 3:35 AM EDT | Fire Weather Watch | RAH | 12 hr |
| May 15, 9:57 PM EDT | Severe Thunderstorm Warning | RAH | 48 min |
| May 16, 8:20 PM EDT | Special Weather Statement | RAH | 55 min |
| May 23, 12:37 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| May 28, 5:37 PM EDT | Special Weather Statement | RAH | 38 min |
| May 28, 5:55 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| May 28, 6:18 PM EDT | Special Weather Statement | RAH | 42 min |
| May 28, 6:18 PM EDT | Mesoscale Discussion | SPC | 87 min |
| May 28, 6:27 PM EDT | Flash Flood Warning | RAH | 2 hr |
| May 28, 6:54 PM EDT | Severe Thunderstorm Warning | RAH | 51 min |
| May 28, 7:54 PM EDT | Severe Thunderstorm Warning | RAH | 51 min |
| May 31, 11:29 AM EDT | Special Weather Statement | RAH | 61 min |
| May 31, 12:44 PM EDT | Special Weather Statement | RAH | 61 min |
| Jun 2, 5:59 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jun 2, 6:26 PM EDT | Severe Thunderstorm Warning | RAH | 34 min |
| Jun 2, 6:46 PM EDT | Flash Flood Warning | RAH | 119 min |
| Jun 2, 6:59 PM EDT | Severe Thunderstorm Warning | RAH | 46 min |
| Jun 2, 7:10 PM EDT | Flash Flood Warning | RAH | 94 min |
| Jun 12, 1:40 PM EDT | Special Weather Statement | RAH | 50 min |
| Jun 12, 2:30 PM EDT | Special Weather Statement | RAH | 60 min |
| Jun 12, 11:40 PM EDT | Special Weather Statement | RAH | 50 min |
| Jun 13, 12:20 AM EDT | Special Weather Statement | RAH | 70 min |
| Jun 13, 12:30 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jun 13, 12:27 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 13, 1:56 PM EDT | Special Weather Statement | RAH | 94 min |
| Jun 14, 4:13 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 14, 4:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 14, 4:28 PM EDT | Special Weather Statement | RAH | 62 min |
| Jun 14, 4:38 PM EDT | Severe Thunderstorm Warning | RAH | 37 min |
| Jun 15, 1:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 16, 2:09 PM EDT | Special Weather Statement | RAH | 51 min |
| Jun 23, 12:49 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 23, 2:28 PM EDT | Special Weather Statement | RAH | 62 min |
| Jun 24, 8:03 PM EDT | Special Weather Statement | RAH | 57 min |
| Jun 24, 8:20 PM EDT | Severe Thunderstorm Warning | RAH | 40 min |
| Jun 28, 7:45 PM EDT | Special Weather Statement | RAH | 60 min |
| Jun 29, 12:34 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 9, 12:19 AM EDT | Special Weather Statement | RAH | 56 min |
| Jul 12, 11:26 AM EDT | Mesoscale Discussion | SPC | 94 min |
| Jul 12, 12:12 PM EDT | Special Weather Statement | RAH | 2 hr |
| Jul 13, 12:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 13, 2:13 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 13, 4:51 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jul 13, 5:23 PM EDT | Severe Thunderstorm Warning | RAH | 52 min |
| Jul 13, 6:11 PM EDT | Severe Thunderstorm Warning | RAH | 64 min |
| Jul 13, 6:33 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jul 16, 3:16 PM EDT | Special Weather Statement | RAH | 59 min |
| Jul 17, 9:07 AM EDT | Special Weather Statement | RAH | 53 min |
| Jul 17, 9:27 AM EDT | Severe Thunderstorm Warning | RAH | 48 min |
| Jul 17, 10:26 AM EDT | Areal Flood Advisory | RAH | 94 min |
| Jul 17, 11:12 AM EDT | Special Weather Statement | RAH | 48 min |
| Jul 17, 1:10 PM EDT | Special Weather Statement | RAH | 65 min |
| Jul 17, 1:39 PM EDT | Areal Flood Advisory | RAH | 4 hr |
| Jul 18, 3:39 PM EDT | Special Weather Statement | RAH | 66 min |
| Jul 20, 12:49 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jul 20, 3:17 PM EDT | Special Weather Statement | RAH | 58 min |
| Jul 20, 3:45 PM EDT | Special Weather Statement | RAH | 60 min |
| Jul 20, 6:05 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Jul 22, 3:08 PM EDT | Heat Advisory | RAH | 29 hr |
| Jul 23, 2:50 PM EDT | Heat Advisory | RAH | 29 hr |
| Jul 24, 3:28 PM EDT | Heat Advisory | RAH | 29 hr |
| Jul 26, 11:49 PM EDT | Special Weather Statement | RAH | 71 min |
| Jul 27, 12:37 AM EDT | Special Weather Statement | RAH | 83 min |
| Jul 27, 2:13 PM EDT | Special Weather Statement | RAH | 62 min |
| Jul 27, 2:20 PM EDT | Severe Thunderstorm Warning | RAH | 55 min |
| Jul 27, 2:48 PM EDT | Areal Flood Advisory | RAH | 2 hr |
| Aug 4, 3:16 PM EDT | Heat Advisory | RAH | 27 hr |
| Aug 5, 2:22 PM EDT | Special Weather Statement | RAH | 93 min |
| Aug 5, 3:31 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 5, 4:22 PM EDT | Special Weather Statement | RAH | 53 min |
| Aug 5, 4:50 PM EDT | Severe Thunderstorm Warning | RAH | 40 min |
| Aug 5, 6:23 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Aug 11, 9:12 PM EDT | Areal Flood Advisory | RAH | 20 min |
| Aug 11, 9:31 PM EDT | Flash Flood Warning | RAH | 3 hr |
| Aug 11, 10:23 PM EDT | Severe Thunderstorm Warning | RAH | 67 min |
| Aug 12, 12:28 AM EDT | Flash Flood Warning | RAH | 84 min |
| Aug 15, 12:46 AM EDT | Special Weather Statement | RAH | 89 min |
| Aug 18, 4:13 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Aug 18, 11:02 PM EDT | Special Weather Statement | RAH | 58 min |
| Aug 19, 10:12 AM EDT | Flash Flood Watch | RAH | 18 hr |
| Aug 24, 5:18 PM EDT | Special Weather Statement | RAH | 57 min |
| Sep 27, 3:46 AM EDT | Flash Flood Watch | RAH | 19 hr |
| Sep 28, 1:42 AM EDT | Special Weather Statement | RAH | 33 min |
| Sep 28, 7:28 PM EDT | Flash Flood Watch | RAH | 50 hr |
| Sep 30, 3:05 AM EDT | Flash Flood Warning | RAH | 5 hr |
| Sep 30, 7:58 AM EDT | Flash Flood Warning | RAH | 2 hr |
| Sep 30, 9:55 AM EDT | Flash Flood Warning | RAH | 3 hr |
| Oct 21, 12:49 AM EDT | Dense Fog Advisory | RAH | 8 hr |
| Oct 22, 8:00 PM EDT | Frost Advisory | RAH | 12 hr |
| Oct 25, 8:23 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Oct 25, 10:16 AM EDT | Special Weather Statement | RAH | 74 min |
| Oct 25, 10:44 AM EDT | Mesoscale Discussion | SPC | 61 min |
| Oct 26, 7:19 PM EDT | Tornado Watch | SPC | 12 hr |
| Oct 26, 10:32 PM EDT | Special Weather Statement | RAH | 73 min |
| Oct 26, 11:05 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Oct 26, 11:40 PM EDT | Tornado Warning | RAH | 50 min |
| Oct 27, 12:21 AM EDT | Areal Flood Advisory | RAH | 2 hr |
| Oct 27, 12:24 AM EDT | Mesoscale Discussion | SPC | 66 min |
| Oct 27, 2:34 AM EDT | Tornado Warning | RAH | 26 min |
| Oct 27, 2:44 AM EDT | Tornado Watch | SPC | 7 hr |
| Oct 27, 3:21 AM EDT | Flash Flood Warning | RAH | 3 hr |
| Oct 27, 5:28 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 27, 10:40 AM EDT | Mesoscale Discussion | SPC | 95 min |
| Oct 27, 1:45 PM EDT | Special Weather Statement | RAH | 60 min |
| Oct 27, 1:48 PM EDT | Severe Thunderstorm Warning | RAH | 57 min |
| Oct 27, 1:53 PM EDT | Tornado Warning | RAH | 52 min |
| Oct 27, 2:06 PM EDT | Tornado Watch | SPC | 6 hr |
| Oct 27, 2:17 PM EDT | Areal Flood Advisory | RAH | 2 hr |
| Oct 27, 2:34 PM EDT | Flash Flood Warning | RAH | 4 hr |
| Oct 27, 2:44 PM EDT | Severe Thunderstorm Warning | RAH | 16 min |
| Oct 27, 3:37 PM EDT | Special Weather Statement | RAH | 68 min |
| Oct 27, 4:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Oct 27, 6:46 PM EDT | Special Weather Statement | RAH | 59 min |
| Oct 27, 7:28 PM EDT | Special Weather Statement | RAH | 62 min |
| Oct 29, 2:47 PM EDT | Frost Advisory | RAH | 17 hr |
| Nov 5, 3:32 PM EDT | Freeze Watch | RAH | 12 hr |
| Nov 6, 3:22 AM EDT | Freeze Warning | RAH | 30 hr |
| Nov 16, 7:34 PM EST | Mesoscale Discussion | SPC | 116 min |
| Nov 16, 8:47 PM EST | Tornado Watch | SPC | 6 hr |
| Nov 16, 9:17 PM EST | Special Weather Statement | RAH | 43 min |
| Nov 16, 9:57 PM EST | Severe Thunderstorm Warning | RAH | 34 min |
| Nov 16, 10:01 PM EST | Areal Flood Advisory | RAH | 52 min |
| Nov 16, 10:19 PM EST | Special Weather Statement | RAH | 26 min |
| Nov 30, 9:29 PM EST | Mesoscale Discussion | SPC | 91 min |
| Nov 30, 9:56 PM EST | Tornado Watch | SPC | 6 hr |
| Dec 1, 12:48 AM EST | Mesoscale Discussion | SPC | 117 min |
| Dec 1, 12:49 AM EST | Severe Thunderstorm Warning | RAH | 56 min |
| Dec 4, 12:01 PM EST | Winter Weather Advisory | RAH | 17 hr |
| Dec 4, 1:24 PM EST | Special Weather Statement | RAH | 96 min |
| Dec 13, 11:25 AM EST | Wind Chill Advisory | RAH | 22 hr |
| Dec 15, 2:18 PM EST | Winter Weather Advisory | RAH | 25 hr |
| Dec 16, 3:29 PM EST | Winter Weather Advisory | RAH | 19 hr |
| Dec 18, 11:57 AM EST | Special Weather Statement | RAH | 2 hr |
| Dec 25, 3:58 AM EST | Winter Storm Warning | RAH | 44 hr |
| Dec 25, 6:00 PM EST | Special Weather Statement | RAH | 60 min |
| Dec 25, 7:15 PM EST | Special Weather Statement | RAH | 105 min |
| Dec 25, 7:16 PM EST | Special Weather Statement | RAH | 104 min |
| Dec 25, 11:23 PM EST | Special Weather Statement | RAH | 97 min |
| Dec 26, 3:38 PM EST | Winter Weather Advisory | RAH | 20 hr |
| Dec 27, 2:34 PM EST | Winter Weather Advisory | 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 | 18 |
| Tornado Warning | 7 |
| Severe Thunderstorm Watch | 4 |
| Tornado Watch | 8 |
| Mesoscale Discussion | 28 |
| Special Weather Statement | 47 |
| Flooding | |
| Flash Flood Warning | 11 |
| Flash Flood Watch | 4 |
| Flood Watch | 1 |
| Areal Flood Advisory | 17 |
| Winter | |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 15 |
| Heat | |
| Heat Advisory | 4 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 4 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 1 |
| Fire | |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20092011
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.