Alert archive / North Carolina / Forsyth County
Weather alerts in Forsyth County, North Carolina, 2015
124 weather alerts in 2015, 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 2015. Tap one for its archive.
- Alerts
- 124
- Warnings
- 18
- Watches
- 14
- Advisories
- 41
- Busiest month
- June25 alerts
- Busiest day
- June 27, 20156 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Forsyth County, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 9 | 7 | 22% | 17 | 71% | 22 min |
| Flash flood warnings | 4 | 3 | 25% | 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 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, 4:42 AM EST | Winter Storm Watch | RAH | 12 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 16, 8:36 PM EST | Special Weather Statement | RAH | 99 min |
| 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 21, 9:23 AM EST | Special Weather Statement | RAH | 3 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 24, 4:38 PM EST | Winter Weather Advisory | RAH | 19 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 27, 2:59 PM EST | Winter Weather Advisory | RAH | 19 hr |
| Feb 28, 3:49 PM EST | Winter Weather Advisory | RAH | 24 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, 5:06 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Apr 9, 6:47 PM EDT | Severe Thunderstorm Warning | RAH | 58 min |
| Apr 10, 3:48 AM EDT | Dense Fog Advisory | RAH | 5 hr |
| Apr 14, 4:28 PM EDT | Special Weather Statement | RAH | 32 min |
| Apr 14, 4:29 PM EDT | Mesoscale Discussion | SPC | 46 min |
| Apr 18, 8:07 AM EDT | Dense Fog Advisory | RAH | 76 min |
| Apr 19, 6:32 PM EDT | Areal Flood Advisory | RAH | 4 hr |
| Apr 19, 7:23 PM EDT | Flash Flood Warning | RAH | 3 hr |
| Apr 20, 10:54 AM EDT | Special Weather Statement | RAH | 66 min |
| Apr 20, 2:30 PM EDT | Special Weather Statement | RAH | 45 min |
| Apr 20, 2:35 PM EDT | Severe Thunderstorm Warning | RAH | 40 min |
| Apr 20, 2:55 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 20, 6:27 PM EDT | Mesoscale Discussion | SPC | 93 min |
| May 1, 4:57 PM EDT | Special Weather Statement | RAH | 93 min |
| May 11, 3:24 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 11, 7:58 PM EDT | Special Weather Statement | RAH | 62 min |
| May 11, 8:31 PM EDT | Severe Thunderstorm Warning | RAH | 59 min |
| May 21, 12:21 AM EDT | Special Weather Statement | RAH | 54 min |
| May 29, 3:56 PM EDT | Areal Flood Advisory | RAH | 2 hr |
| May 31, 7:10 PM EDT | Areal Flood Advisory | RAH | 110 min |
| Jun 2, 12:46 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 2, 7:24 PM EDT | Severe Thunderstorm Warning | RAH | 66 min |
| Jun 2, 8:30 PM EDT | Severe Thunderstorm Warning | RAH | 60 min |
| Jun 2, 8:52 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jun 8, 6:24 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 8, 7:03 PM EDT | Special Weather Statement | RAH | 27 min |
| Jun 9, 12:38 AM EDT | Special Weather Statement | RAH | 52 min |
| Jun 12, 5:55 PM EDT | Special Weather Statement | RAH | 80 min |
| Jun 18, 1:32 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 19, 5:16 PM EDT | Severe Thunderstorm Warning | RAH | 46 min |
| Jun 20, 1:36 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jun 20, 3:26 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jun 21, 7:35 PM EDT | Special Weather Statement | RAH | 55 min |
| Jun 23, 3:02 PM EDT | Special Weather Statement | RAH | 43 min |
| Jun 26, 3:13 PM EDT | Special Weather Statement | RAH | 62 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, 11:43 PM EDT | Special Weather Statement | RAH | 47 min |
| 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, 5:00 PM EDT | Severe Thunderstorm Warning | RAH | 45 min |
| Jun 27, 5:23 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jun 27, 6:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 30, 12:55 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 30, 3:34 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 3, 7:11 PM EDT | Special Weather Statement | RAH | 64 min |
| Jul 5, 4:57 PM EDT | Special Weather Statement | RAH | 63 min |
| Jul 13, 6:23 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 13, 7:18 PM EDT | Special Weather Statement | RAH | 57 min |
| Jul 13, 7:46 PM EDT | Severe Thunderstorm Warning | RAH | 59 min |
| Jul 13, 8:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jul 13, 8:46 PM EDT | Severe Thunderstorm Warning | RAH | 74 min |
| Jul 18, 2:05 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 18, 9:32 PM EDT | Special Weather Statement | RAH | 43 min |
| Jul 18, 9:42 PM EDT | Areal Flood Advisory | RAH | 2 hr |
| Jul 21, 4:42 PM EDT | Special Weather Statement | RAH | 63 min |
| Jul 29, 5:01 PM EDT | Special Weather Statement | RAH | 59 min |
| Jul 30, 2:16 PM EDT | Special Weather Statement | RAH | 59 min |
| Aug 4, 3:35 PM EDT | Special Weather Statement | RAH | 55 min |
| Aug 6, 7:59 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Aug 6, 8:54 PM EDT | Flash Flood Warning | RAH | 3 hr |
| Aug 10, 7:21 PM EDT | Special Weather Statement | RAH | 54 min |
| Aug 10, 8:18 PM EDT | Areal Flood Advisory | RAH | 117 min |
| Aug 11, 1:30 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 11, 4:32 PM EDT | Special Weather Statement | RAH | 58 min |
| Aug 15, 5:51 PM EDT | Special Weather Statement | RAH | 39 min |
| Aug 18, 9:10 PM EDT | Special Weather Statement | RAH | 65 min |
| Aug 18, 9:46 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Aug 19, 6:20 PM EDT | Special Weather Statement | RAH | 55 min |
| Aug 24, 5:55 PM EDT | Special Weather Statement | RAH | 50 min |
| Sep 4, 4:33 PM EDT | Special Weather Statement | RAH | 57 min |
| Sep 4, 5:21 PM EDT | Special Weather Statement | RAH | 54 min |
| Sep 10, 2:01 PM EDT | Special Weather Statement | RAH | 74 min |
| Sep 10, 5:07 PM EDT | Special Weather Statement | RAH | 83 min |
| Sep 30, 3:03 PM EDT | Flash Flood Watch | RAH | 5 days |
| Oct 2, 7:10 AM EDT | Wind Advisory | RAH | 3 days |
| Oct 2, 11:42 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Oct 3, 12:36 AM EDT | Flash Flood Warning | RAH | 5 hr |
| Oct 3, 3:56 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| Oct 3, 6:53 AM EDT | Areal Flood Advisory | RAH | 112 min |
| 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 |
| Nov 2, 8:08 AM EST | Areal Flood Advisory | RAH | 3 hr |
| Nov 2, 10:41 AM EST | Flash Flood Watch | RAH | 17 hr |
| Dec 1, 6:14 PM EST | Dense Fog Advisory | RAH | 16 hr |
| Dec 8, 10:53 PM EST | Dense Fog Advisory | RAH | 12 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, 3:53 PM EST | Flash Flood Watch | RAH | 51 hr |
| Dec 24, 10:39 AM EST | Special Weather Statement | RAH | 51 min |
| Dec 29, 3:07 PM EST | Flood Watch | RAH | 35 hr |
| Dec 29, 10:11 PM EST | Dense Fog Advisory | RAH | 8 hr |
| Dec 30, 11:58 AM EST | Areal Flood Advisory | RAH | 3 hr |
| Dec 30, 1:34 PM EST | Flash Flood Warning | RAH | 5 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 | 9 |
| Severe Thunderstorm Watch | 5 |
| Mesoscale Discussion | 17 |
| Special Weather Statement | 34 |
| Flooding | |
| Flash Flood Warning | 4 |
| Flash Flood Watch | 4 |
| Flood Watch | 1 |
| Areal Flood Advisory | 14 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 9 |
| 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.