Alert archive / North Carolina / Forsyth County
Weather alerts in Forsyth County, North Carolina, 2020
134 weather alerts in 2020, 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 2020. Tap one for its archive.
- Alerts
- 134
- Warnings
- 35
- Watches
- 11
- Advisories
- 34
- Busiest month
- August33 alerts
- Busiest day
- August 6, 20208 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 2 tornado warnings covering Forsyth County in 2020 had a tornado report inside them.
Forsyth County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 10 | 10 | 0% | 28 | 75% | 26 min |
| Flash flood warnings | 12 | 8 | 33% | 12 | 100% | 48 min |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Raleigh, NC: tornado warnings | 32 | 5 | 84% | 9 | 78% | 6 min |
| NWS Raleigh, NC: severe thunderstorm warnings | 164 | 104 | 37% | 380 | 82% | 26 min |
| NWS Raleigh, NC: flash flood warnings | 61 | 40 | 34% | 175 | 85% | 130 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 11, 8:40 PM EST | Mesoscale Discussion | SPC | 95 min |
| Jan 11, 9:35 PM EST | Severe Thunderstorm Watch | SPC | 4 hr |
| Jan 11, 10:00 PM EST | Severe Thunderstorm Warning | RAH | 45 min |
| Jan 11, 10:41 PM EST | Severe Thunderstorm Warning | RAH | 64 min |
| Jan 24, 6:46 PM EST | Special Weather Statement | RAH | 59 min |
| Jan 24, 7:21 PM EST | Areal Flood Advisory | RAH | 114 min |
| Feb 5, 3:09 PM EST | Flood Watch | RAH | 34 hr |
| Feb 6, 10:12 AM EST | Tornado Watch | SPC | 7 hr |
| Feb 6, 10:44 AM EST | Special Weather Statement | RAH | 46 min |
| Feb 6, 10:57 AM EST | Severe Thunderstorm Warning | RAH | 48 min |
| Feb 6, 11:12 AM EST | Tornado Warning | RAH | 33 min |
| Feb 6, 11:26 AM EST | Severe Thunderstorm Warning | RAH | 64 min |
| Feb 6, 12:06 PM EST | Areal Flood Advisory | RAH | 6 hr |
| Feb 6, 2:02 PM EST | Areal Flood Warning | RAH | 6 hr |
| Feb 6, 7:54 PM EST | Areal Flood Warning | RAH | 10 hr |
| Feb 6, 9:16 PM EST | Wind Advisory | RAH | 19 hr |
| Feb 11, 7:51 AM EST | Special Weather Statement | RAH | 84 min |
| Feb 19, 2:16 PM EST | Winter Weather Advisory | RAH | 44 hr |
| Feb 26, 3:31 AM EST | Dense Fog Advisory | RAH | 5 hr |
| Feb 29, 3:40 AM EST | Special Weather Statement | RAH | 80 min |
| Mar 18, 4:25 AM EDT | Dense Fog Advisory | RAH | 6 hr |
| Apr 7, 2:22 PM EDT | Special Weather Statement | RAH | 53 min |
| Apr 8, 6:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Apr 10, 10:49 AM EDT | Red Flag Warning | RAH | 7 hr |
| Apr 10, 3:13 PM EDT | Freeze Warning | RAH | 17 hr |
| Apr 12, 3:33 PM EDT | Wind Advisory | RAH | 24 hr |
| Apr 13, 2:39 AM EDT | Mesoscale Discussion | SPC | 96 min |
| Apr 13, 4:40 AM EDT | Severe Thunderstorm Warning | RAH | 50 min |
| Apr 13, 4:51 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| Apr 13, 5:01 AM EDT | Tornado Watch | SPC | 7 hr |
| Apr 13, 5:06 AM EDT | Tornado Warning | RAH | 24 min |
| Apr 13, 5:28 AM EDT | Severe Thunderstorm Warning | RAH | 62 min |
| Apr 15, 3:06 AM EDT | Frost Advisory | RAH | 29 hr |
| Apr 16, 3:18 PM EDT | Frost Advisory | RAH | 17 hr |
| Apr 18, 9:51 PM EDT | Frost Advisory | RAH | 10 hr |
| Apr 30, 1:23 AM EDT | Special Weather Statement | RAH | 82 min |
| May 9, 3:57 AM EDT | Freeze Warning | RAH | 28 hr |
| May 19, 5:06 AM EDT | Special Weather Statement | RAH | 54 min |
| May 19, 3:39 PM EDT | Flash Flood Watch | RAH | 60 hr |
| May 21, 8:30 AM EDT | Flash Flood Warning | RAH | 5 hr |
| May 23, 7:15 PM EDT | Special Weather Statement | RAH | 60 min |
| May 24, 1:44 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 24, 5:34 PM EDT | Special Weather Statement | RAH | 56 min |
| May 24, 6:29 PM EDT | Special Weather Statement | RAH | 61 min |
| May 27, 4:24 AM EDT | Flash Flood Watch | RAH | 21 hr |
| May 27, 8:01 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jun 10, 4:24 PM EDT | Special Weather Statement | RAH | 66 min |
| Jun 20, 12:56 PM EDT | Special Weather Statement | RAH | 64 min |
| Jun 20, 2:08 PM EDT | Special Weather Statement | RAH | 67 min |
| Jun 25, 5:48 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jul 5, 7:40 PM EDT | Severe Thunderstorm Warning | RAH | 50 min |
| Jul 5, 8:12 PM EDT | Flash Flood Warning | RAH | 84 min |
| Jul 5, 8:30 PM EDT | Severe Thunderstorm Warning | RAH | 45 min |
| Jul 10, 6:34 PM EDT | Special Weather Statement | RAH | 56 min |
| Jul 10, 8:18 PM EDT | Severe Thunderstorm Warning | RAH | 42 min |
| Jul 12, 11:45 PM EDT | Special Weather Statement | RAH | 30 min |
| Jul 17, 1:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 17, 3:11 PM EDT | Special Weather Statement | RAH | 64 min |
| Jul 18, 3:18 PM EDT | Heat Advisory | RAH | 30 hr |
| Jul 18, 5:13 PM EDT | Areal Flood Advisory | RAH | 104 min |
| Jul 19, 2:59 PM EDT | Heat Advisory | RAH | 30 hr |
| Jul 20, 12:57 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 3:23 PM EDT | Heat Advisory | RAH | 30 hr |
| Jul 21, 1:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 21, 3:00 PM EDT | Heat Advisory | RAH | 30 hr |
| Jul 21, 8:31 PM EDT | Special Weather Statement | RAH | 44 min |
| Jul 23, 1:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 4:09 PM EDT | Special Weather Statement | RAH | 66 min |
| Jul 23, 4:24 PM EDT | Flash Flood Warning | RAH | 5 hr |
| Jul 24, 9:02 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jul 28, 3:19 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 29, 8:02 PM EDT | Special Weather Statement | RAH | 58 min |
| Jul 31, 7:43 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 31, 9:56 PM EDT | Special Weather Statement | RAH | 64 min |
| Aug 2, 4:06 AM EDT | Flash Flood Watch | RAH | 52 hr |
| Aug 2, 2:18 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Aug 3, 12:09 AM EDT | Special Weather Statement | RAH | 66 min |
| Aug 3, 1:13 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| Aug 3, 1:22 AM EDT | Special Weather Statement | RAH | 53 min |
| Aug 3, 3:04 AM EDT | Special Weather Statement | RAH | 56 min |
| Aug 5, 1:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Aug 5, 1:46 PM EDT | Special Weather Statement | RAH | 59 min |
| Aug 5, 8:54 PM EDT | Special Weather Statement | RAH | 36 min |
| Aug 5, 10:59 PM EDT | Special Weather Statement | RAH | 91 min |
| Aug 5, 11:32 PM EDT | Areal Flood Advisory | RAH | 100 min |
| Aug 6, 12:02 AM EDT | Flash Flood Warning | RAH | 86 min |
| Aug 6, 2:08 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 6, 6:03 PM EDT | Special Weather Statement | RAH | 57 min |
| Aug 6, 6:26 PM EDT | Flash Flood Warning | RAH | 3 hr |
| Aug 6, 6:32 PM EDT | Severe Thunderstorm Warning | RAH | 43 min |
| Aug 6, 9:29 PM EDT | Flash Flood Warning | RAH | 2 hr |
| Aug 10, 5:04 PM EDT | Areal Flood Advisory | RAH | 2 hr |
| Aug 10, 5:19 PM EDT | Flash Flood Warning | RAH | 110 min |
| Aug 10, 5:34 PM EDT | Flash Flood Warning | RAH | 116 min |
| Aug 12, 1:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 13, 8:09 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Aug 13, 8:31 PM EDT | Flash Flood Warning | RAH | 3 hr |
| Aug 14, 6:16 PM EDT | Areal Flood Advisory | RAH | 119 min |
| Aug 14, 6:36 PM EDT | Flash Flood Warning | RAH | 114 min |
| Aug 15, 3:56 AM EDT | Flash Flood Watch | RAH | 18 hr |
| Aug 15, 1:40 PM EDT | Special Weather Statement | RAH | 65 min |
| Aug 15, 2:16 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Aug 17, 3:16 PM EDT | Special Weather Statement | RAH | 59 min |
| Aug 22, 3:47 AM EDT | Dense Fog Advisory | RAH | 5 hr |
| Aug 28, 7:21 PM EDT | Special Weather Statement | RAH | 54 min |
| Aug 28, 7:50 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 16, 4:19 AM EDT | Flash Flood Watch | RAH | 47 hr |
| Sep 27, 3:21 AM EDT | Dense Fog Advisory | RAH | 6 hr |
| Sep 29, 2:36 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 29, 3:20 PM EDT | Special Weather Statement | RAH | 55 min |
| Oct 17, 1:59 PM EDT | Frost Advisory | RAH | 19 hr |
| Oct 25, 7:50 AM EDT | Special Weather Statement | RAH | 85 min |
| Oct 25, 8:26 AM EDT | Areal Flood Advisory | RAH | 3 hr |
| Oct 26, 9:13 PM EDT | Dense Fog Advisory | RAH | 13 hr |
| Oct 28, 2:26 PM EDT | Wind Advisory | RAH | 26 hr |
| Oct 28, 7:02 PM EDT | Tropical Storm Warning | RAH | 22 hr |
| Oct 29, 8:56 PM EDT | Special Weather Statement | RAH | 49 min |
| Oct 29, 9:46 PM EDT | Areal Flood Warning | RAH | 8 hr |
| Nov 1, 3:28 AM EST | Freeze Watch | RAH | 12 hr |
| Nov 1, 3:35 PM EST | Freeze Warning | RAH | 16 hr |
| Nov 2, 1:59 PM EST | Freeze Warning | RAH | 18 hr |
| Nov 11, 3:08 AM EST | Flash Flood Watch | RAH | 36 hr |
| Nov 11, 5:16 PM EST | Special Weather Statement | RAH | 44 min |
| Nov 11, 5:48 PM EST | Areal Flood Advisory | RAH | 2 hr |
| Nov 12, 6:23 AM EST | Flash Flood Warning | RAH | 4 hr |
| Nov 12, 9:56 AM EST | Flash Flood Warning | RAH | 6 hr |
| Nov 12, 3:56 PM EST | Areal Flood Warning | RAH | 5 hr |
| Nov 12, 8:52 PM EST | Areal Flood Warning | RAH | 19 hr |
| Nov 26, 8:46 PM EST | Dense Fog Advisory | RAH | 12 hr |
| Nov 30, 7:38 AM EST | Special Weather Statement | RAH | 52 min |
| Dec 4, 9:53 PM EST | Special Weather Statement | RAH | 52 min |
| Dec 15, 3:54 AM EST | Winter Weather Advisory | RAH | 36 hr |
| Dec 16, 6:36 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 17, 2:57 AM EST | Dense Fog Advisory | RAH | 7 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 | 10 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 1 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 18 |
| Special Weather Statement | 36 |
| Flooding | |
| Areal Flood Warning | 5 |
| Flash Flood Warning | 12 |
| Flash Flood Watch | 6 |
| Flood Watch | 1 |
| Areal Flood Advisory | 14 |
| Winter | |
| Winter Weather Advisory | 2 |
| Heat | |
| Heat Advisory | 4 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 1 |
| Frost Advisory | 4 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 7 |
| 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 archive20192021
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.