Alert archive / North Carolina / Granville County
Weather alerts in Granville County, North Carolina, 2021
128 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Granville County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 128
- Warnings
- 30
- Watches
- 12
- Advisories
- 30
- Busiest month
- April19 alerts
- Busiest day
- March 27, 20217 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 Granville County in 2021 had a tornado report inside them.
Granville County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 15 | 9 | 40% | 3 | 100% | 21 min |
| Flash flood warnings | 3 | 1 | 67% | 0 |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Raleigh, NC: tornado warnings | 22 | 4 | 82% | 4 | 100% | 5 min |
| NWS Raleigh, NC: severe thunderstorm warnings | 138 | 84 | 39% | 237 | 81% | 19 min |
| NWS Raleigh, NC: flash flood warnings | 27 | 14 | 48% | 36 | 67% | 100 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, 7:45 PM EST | Special Weather Statement | RAH | 60 min |
| Jan 1, 9:47 PM EST | Areal Flood Advisory | RAH | 58 min |
| Jan 2, 8:15 AM EST | Dense Fog Advisory | RAH | 3 hr |
| Jan 7, 3:36 PM EST | Winter Weather Advisory | RAH | 30 hr |
| Jan 16, 1:27 AM EST | Dense Fog Advisory | RAH | 8 hr |
| Jan 27, 3:18 AM EST | Winter Weather Advisory | RAH | 29 hr |
| Jan 28, 3:22 AM EST | Winter Storm Warning | RAH | 5 hr |
| Jan 30, 4:10 AM EST | Winter Weather Advisory | RAH | 34 hr |
| Feb 1, 8:41 AM EST | Special Weather Statement | RAH | 64 min |
| Feb 11, 3:54 PM EST | Winter Weather Advisory | RAH | 68 hr |
| Feb 12, 3:39 PM EST | Winter Storm Warning | RAH | 24 hr |
| Feb 13, 2:21 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 15, 11:33 PM EST | Areal Flood Advisory | RAH | 3 hr |
| Feb 16, 3:57 AM EST | Winter Storm Watch | RAH | 23 hr |
| Feb 17, 3:13 AM EST | Winter Storm Warning | RAH | 52 hr |
| Feb 18, 10:23 AM EST | Mesoscale Discussion | SPC | 3 hr |
| Feb 19, 4:56 AM EST | Mesoscale Discussion | SPC | 3 hr |
| Mar 18, 4:45 PM EDT | Tornado Watch | SPC | 4 hr |
| Mar 18, 5:57 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Mar 18, 6:41 PM EDT | Tornado Warning | RAH | 34 min |
| Mar 18, 6:57 PM EDT | Tornado Warning | RAH | 48 min |
| Mar 18, 7:49 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Mar 27, 6:39 AM EDT | Dense Fog Advisory | RAH | 3 hr |
| Mar 27, 1:39 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Mar 27, 2:03 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Mar 27, 4:00 PM EDT | Special Weather Statement | RAH | 60 min |
| Mar 27, 4:42 PM EDT | Severe Thunderstorm Warning | RAH | 48 min |
| Mar 27, 4:45 PM EDT | Special Weather Statement | RAH | 60 min |
| Mar 27, 4:49 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Mar 28, 7:50 PM EDT | Special Weather Statement | RAH | 40 min |
| Mar 28, 8:29 PM EDT | Special Weather Statement | RAH | 46 min |
| Mar 29, 3:26 AM EDT | Frost Advisory | RAH | 29 hr |
| Mar 31, 2:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Mar 31, 2:34 PM EDT | Freeze Watch | RAH | 13 hr |
| Mar 31, 3:19 PM EDT | Special Weather Statement | RAH | 56 min |
| Apr 1, 3:49 AM EDT | Freeze Warning | RAH | 29 hr |
| Apr 2, 9:02 AM EDT | Hard Freeze Warning | RAH | 24 hr |
| Apr 3, 9:43 AM EDT | Frost Advisory | RAH | 23 hr |
| Apr 9, 3:38 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 9, 4:10 PM EDT | Severe Thunderstorm Warning | RAH | 50 min |
| Apr 9, 4:44 PM EDT | Severe Thunderstorm Warning | RAH | 46 min |
| Apr 9, 5:12 PM EDT | Severe Thunderstorm Warning | RAH | 63 min |
| Apr 9, 6:23 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Apr 9, 7:20 PM EDT | Special Weather Statement | RAH | 55 min |
| Apr 9, 11:05 PM EDT | Special Weather Statement | RAH | 40 min |
| Apr 11, 12:40 AM EDT | Special Weather Statement | RAH | 65 min |
| Apr 14, 4:24 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 14, 6:13 PM EDT | Severe Thunderstorm Warning | RAH | 62 min |
| Apr 20, 3:16 PM EDT | Fire Weather Watch | RAH | 12 hr |
| Apr 21, 3:22 AM EDT | Red Flag Warning | RAH | 17 hr |
| Apr 21, 10:58 AM EDT | Freeze Warning | RAH | 21 hr |
| Apr 22, 10:45 AM EDT | Freeze Warning | RAH | 22 hr |
| Apr 29, 2:26 PM EDT | Fire Weather Watch | RAH | 13 hr |
| Apr 30, 3:25 AM EDT | Red Flag Warning | RAH | 16 hr |
| May 4, 3:46 PM EDT | Severe Thunderstorm Warning | RAH | 44 min |
| May 4, 4:16 PM EDT | Mesoscale Discussion | SPC | 119 min |
| May 10, 12:51 PM EDT | Mesoscale Discussion | SPC | 114 min |
| May 24, 1:57 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 28, 6:23 PM EDT | Special Weather Statement | RAH | 52 min |
| May 29, 12:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 2, 4:11 PM EDT | Areal Flood Advisory | RAH | 49 min |
| Jun 3, 3:23 AM EDT | Flash Flood Watch | RAH | 24 hr |
| Jun 3, 3:17 PM EDT | Areal Flood Advisory | RAH | 118 min |
| Jun 3, 4:27 PM EDT | Flash Flood Warning | RAH | 112 min |
| Jun 3, 4:58 PM EDT | Areal Flood Advisory | RAH | 95 min |
| Jun 4, 3:39 PM EDT | Special Weather Statement | RAH | 51 min |
| Jun 9, 1:44 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 9, 5:46 PM EDT | Special Weather Statement | RAH | 59 min |
| Jun 9, 6:37 PM EDT | Severe Thunderstorm Warning | RAH | 38 min |
| Jun 9, 7:04 PM EDT | Special Weather Statement | RAH | 41 min |
| Jun 9, 8:37 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jun 10, 3:39 PM EDT | Flash Flood Watch | RAH | 32 hr |
| Jun 10, 5:20 PM EDT | Special Weather Statement | RAH | 55 min |
| Jun 11, 4:32 PM EDT | Special Weather Statement | RAH | 58 min |
| Jun 20, 11:00 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jun 22, 12:13 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 22, 12:56 PM EDT | Special Weather Statement | RAH | 34 min |
| Jun 26, 4:40 PM EDT | Areal Flood Advisory | RAH | 88 min |
| Jul 1, 10:01 PM EDT | Severe Thunderstorm Warning | RAH | 44 min |
| Jul 1, 10:42 PM EDT | Severe Thunderstorm Warning | RAH | 48 min |
| Jul 7, 3:01 PM EDT | Flash Flood Watch | RAH | 27 hr |
| Jul 8, 2:35 PM EDT | Special Weather Statement | RAH | 70 min |
| Jul 8, 3:07 PM EDT | Flash Flood Warning | RAH | 2 hr |
| Jul 8, 3:31 PM EDT | Flash Flood Warning | RAH | 2 hr |
| Jul 9, 1:51 PM EDT | Special Weather Statement | RAH | 54 min |
| Jul 9, 2:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 9, 3:04 PM EDT | Special Weather Statement | RAH | 56 min |
| Jul 17, 1:15 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 17, 9:59 PM EDT | Severe Thunderstorm Warning | RAH | 46 min |
| Jul 17, 10:48 PM EDT | Special Weather Statement | RAH | 42 min |
| Jul 18, 6:51 PM EDT | Severe Thunderstorm Warning | RAH | 39 min |
| Jul 18, 11:19 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jul 19, 12:19 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Jul 26, 12:58 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 26, 3:29 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 1, 6:29 AM EDT | Mesoscale Discussion | SPC | 91 min |
| Aug 1, 8:00 AM EDT | Special Weather Statement | RAH | 45 min |
| Aug 7, 10:14 AM EDT | Areal Flood Advisory | RAH | 61 min |
| Aug 8, 2:02 AM EDT | Dense Fog Advisory | RAH | 7 hr |
| Aug 12, 3:30 PM EDT | Heat Advisory | RAH | 28 hr |
| Aug 14, 12:03 AM EDT | Special Weather Statement | RAH | 42 min |
| Aug 14, 4:01 AM EDT | Heat Advisory | RAH | 14 hr |
| Aug 14, 1:10 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 14, 3:01 PM EDT | Severe Thunderstorm Warning | RAH | 44 min |
| Aug 14, 3:53 PM EDT | Severe Thunderstorm Warning | RAH | 29 min |
| Aug 15, 5:06 PM EDT | Areal Flood Advisory | RAH | 3 hr |
| Aug 15, 5:09 PM EDT | Special Weather Statement | RAH | 36 min |
| Aug 16, 6:37 PM EDT | Special Weather Statement | RAH | 53 min |
| Aug 16, 9:05 PM EDT | Areal Flood Advisory | RAH | 51 min |
| Aug 19, 11:37 PM EDT | Special Weather Statement | RAH | 53 min |
| Aug 20, 12:11 AM EDT | Areal Flood Advisory | RAH | 109 min |
| Aug 22, 5:00 PM EDT | Special Weather Statement | RAH | 45 min |
| Sep 22, 12:12 PM EDT | Areal Flood Advisory | RAH | 2 hr |
| Sep 22, 2:44 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 16, 1:47 PM EDT | Special Weather Statement | RAH | 58 min |
| Oct 25, 3:01 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Oct 25, 6:26 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Oct 25, 8:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Oct 25, 8:37 PM EDT | Severe Thunderstorm Warning | RAH | 38 min |
| Oct 25, 9:01 PM EDT | Special Weather Statement | RAH | 29 min |
| Oct 25, 9:07 PM EDT | Severe Thunderstorm Warning | RAH | 38 min |
| Oct 25, 10:19 PM EDT | Areal Flood Advisory | RAH | 2 hr |
| Nov 3, 2:19 PM EDT | Freeze Watch | RAH | 13 hr |
| Nov 4, 3:13 AM EDT | Freeze Warning | RAH | 30 hr |
| Dec 11, 6:15 PM EST | Special Weather Statement | RAH | 45 min |
| Dec 11, 6:59 PM EST | Special Weather Statement | RAH | 61 min |
| Dec 18, 3:28 AM EST | Dense Fog Advisory | RAH | 6 hr |
| Dec 25, 3:23 AM EST | Wind Advisory | RAH | 13 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 | 15 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 25 |
| Special Weather Statement | 31 |
| Flooding | |
| Flash Flood Warning | 3 |
| Flash Flood Watch | 3 |
| Areal Flood Advisory | 16 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 4 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 4 |
| Hard Freeze Warning | 1 |
| Freeze Watch | 2 |
| Frost Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 1 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20202022
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.