Alert archive / Tennessee / Grundy County
Weather alerts in Grundy County, Tennessee, 2021
96 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Grundy County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 96
- Warnings
- 17
- Watches
- 20
- Advisories
- 31
- Busiest month
- March21 alerts
- Busiest day
- December 11, 20216 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 3 tornado warnings covering Grundy County in 2021 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 1 minutes after it went out.
Grundy County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 1 | 67% | 1 | 100% | 1 min |
| Severe thunderstorm warnings | 6 | 4 | 33% | 2 | 50% | 17 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Nashville, TN: tornado warnings | 63 | 23 | 63% | 54 | 63% | 16 min |
| NWS Nashville, TN: severe thunderstorm warnings | 166 | 84 | 49% | 300 | 73% | 23 min |
| NWS Nashville, TN: flash flood warnings | 74 | 49 | 34% | 157 | 87% | 139 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, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 7, 10:07 AM CST | Winter Weather Advisory | OHX | 23 hr |
| Jan 15, 2:46 AM CST | Winter Weather Advisory | OHX | 31 hr |
| Jan 22, 12:39 AM CST | Dense Fog Advisory | OHX | 8 hr |
| Jan 30, 1:23 PM CST | Wind Advisory | OHX | 14 hr |
| Jan 31, 2:05 PM CST | Winter Weather Advisory | OHX | 34 hr |
| Feb 6, 2:44 AM CST | Winter Weather Advisory | OHX | 27 hr |
| Feb 12, 10:00 PM CST | Winter Weather Advisory | OHX | 14 hr |
| Feb 13, 3:14 AM CST | Winter Storm Watch | OHX | 24 hr |
| Feb 14, 3:43 AM CST | Winter Storm Warning | OHX | 42 hr |
| Feb 14, 7:10 AM CST | Winter Weather Advisory | OHX | 11 hr |
| Feb 16, 2:53 PM CST | Winter Storm Watch | OHX | 13 hr |
| Feb 17, 3:24 AM CST | Winter Storm Warning | OHX | 30 hr |
| Feb 17, 1:00 PM CST | Mesoscale Discussion | SPC | 3 hr |
| Feb 17, 7:44 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Feb 18, 9:17 AM CST | Winter Weather Advisory | OHX | 12 hr |
| Feb 27, 2:50 AM CST | Flood Watch | OHX | 51 hr |
| Feb 28, 7:11 PM CST | Severe Thunderstorm Watch | SPC | 3 hr |
| Feb 28, 7:16 PM CST | Mesoscale Discussion | SPC | 59 min |
| Feb 28, 8:45 PM CST | Mesoscale Discussion | SPC | 90 min |
| Mar 18, 8:23 AM CDT | River Flood Advisory | OHX | 6 hr |
| Mar 24, 1:28 PM CDT | Flood Watch | OHX | 7 hr |
| Mar 24, 8:08 PM CDT | Flash Flood Watch | OHX | 27 hr |
| Mar 25, 2:19 AM CDT | Wind Advisory | OHX | 21 hr |
| Mar 25, 3:48 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 25, 7:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Mar 25, 10:37 PM CDT | Special Weather Statement | OHX | 23 min |
| Mar 26, 5:58 PM CDT | Flash Flood Watch | OHX | 42 hr |
| Mar 27, 7:41 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 27, 11:55 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Mar 27, 1:51 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 27, 11:27 PM CDT | Tornado Watch | SPC | 8 hr |
| Mar 28, 1:25 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 28, 2:57 AM CDT | Special Weather Statement | OHX | 63 min |
| Mar 29, 6:09 PM CDT | Flash Flood Watch | OHX | 39 hr |
| Mar 31, 1:22 PM CDT | River Flood Advisory | OHX | 7 hr |
| Mar 31, 1:39 PM CDT | Freeze Warning | OHX | 19 hr |
| Mar 31, 1:39 PM CDT | Hard Freeze Warning | OHX | 43 hr |
| Apr 1, 1:13 PM CDT | Freeze Warning | OHX | 44 hr |
| Apr 3, 2:09 PM CDT | Frost Advisory | OHX | 18 hr |
| Apr 20, 2:17 AM CDT | Freeze Watch | OHX | 24 hr |
| Apr 21, 2:13 AM CDT | Freeze Warning | OHX | 30 hr |
| Apr 22, 2:20 AM CDT | Frost Advisory | OHX | 29 hr |
| Apr 24, 5:05 PM CDT | Special Weather Statement | OHX | 40 min |
| Apr 24, 5:22 PM CDT | Tornado Warning | OHX | 23 min |
| Apr 24, 5:45 PM CDT | Special Weather Statement | OHX | 30 min |
| Apr 24, 6:02 PM CDT | Tornado Warning | OHX | 28 min |
| May 3, 6:50 AM CDT | Mesoscale Discussion | SPC | 115 min |
| May 4, 5:13 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 4, 7:31 AM CDT | Mesoscale Discussion | SPC | 89 min |
| May 4, 7:53 AM CDT | Severe Thunderstorm Warning | OHX | 37 min |
| May 6, 6:27 PM CDT | Severe Thunderstorm Warning | OHX | 48 min |
| May 6, 7:15 PM CDT | Special Weather Statement | OHX | 30 min |
| May 9, 2:22 AM CDT | Wind Advisory | OHX | 17 hr |
| May 9, 3:23 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 9, 8:43 PM CDT | Special Weather Statement | OHX | 32 min |
| May 26, 8:58 PM CDT | Dense Fog Advisory | OHX | 12 hr |
| Jun 3, 12:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 4, 4:06 AM CDT | Dense Fog Advisory | OHX | 4 hr |
| Jul 27, 3:08 AM CDT | Dense Fog Advisory | OHX | 5 hr |
| Jul 28, 2:47 AM CDT | Dense Fog Advisory | OHX | 5 hr |
| Jul 29, 3:23 AM CDT | Dense Fog Advisory | OHX | 4 hr |
| Jul 31, 11:29 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jul 31, 11:55 PM CDT | Severe Thunderstorm Warning | OHX | 53 min |
| Aug 11, 6:40 PM CDT | Special Weather Statement | OHX | 35 min |
| Aug 15, 4:16 PM CDT | Areal Flood Advisory | OHX | 119 min |
| Aug 18, 8:06 PM CDT | Special Weather Statement | OHX | 54 min |
| Aug 18, 8:57 PM CDT | Special Weather Statement | OHX | 63 min |
| Aug 29, 4:12 AM CDT | Flash Flood Watch | OHX | 62 hr |
| Sep 18, 2:24 AM CDT | Flash Flood Watch | OHX | 65 hr |
| Sep 19, 10:04 AM CDT | Areal Flood Advisory | OHX | 3 hr |
| Oct 6, 3:06 AM CDT | Flash Flood Watch | OHX | 28 hr |
| Oct 6, 1:26 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 6, 2:53 PM CDT | Tornado Watch | SPC | 7 hr |
| Oct 6, 5:25 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Oct 6, 7:31 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Oct 6, 9:15 PM CDT | Areal Flood Advisory | OHX | 3 hr |
| Oct 8, 1:35 AM CDT | Dense Fog Advisory | OHX | 7 hr |
| Oct 21, 2:50 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Nov 2, 2:53 AM CDT | Frost Advisory | OHX | 30 hr |
| Nov 2, 2:18 PM CDT | Freeze Watch | OHX | 12 hr |
| Nov 3, 2:35 AM CDT | Freeze Warning | OHX | 30 hr |
| Nov 3, 1:50 PM CDT | Freeze Warning | OHX | 43 hr |
| Nov 6, 2:30 AM CDT | Dense Fog Advisory | OHX | 8 hr |
| Nov 12, 12:15 AM CST | Dense Fog Advisory | OHX | 8 hr |
| Dec 6, 7:59 AM CST | Severe Thunderstorm Warning | OHX | 31 min |
| Dec 10, 11:22 AM CST | Wind Advisory | OHX | 25 hr |
| Dec 11, 2:00 AM CST | Mesoscale Discussion | SPC | 90 min |
| Dec 11, 3:41 AM CST | Tornado Watch | SPC | 6 hr |
| Dec 11, 6:15 AM CST | Mesoscale Discussion | SPC | 90 min |
| Dec 11, 6:58 AM CST | Severe Thunderstorm Warning | OHX | 32 min |
| Dec 11, 7:22 AM CST | Severe Thunderstorm Warning | OHX | 38 min |
| Dec 11, 7:35 AM CST | Tornado Warning | OHX | 25 min |
| Dec 26, 5:17 AM CST | Dense Fog Advisory | OHX | 6 hr |
| Dec 29, 7:02 PM CST | Special Weather Statement | OHX | 28 min |
| Dec 30, 6:21 AM CST | Dense Fog Advisory | OHX | 3 hr |
| Dec 30, 7:50 PM CST | Dense Fog Advisory | OHX | 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 | 6 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 5 |
| Mesoscale Discussion | 18 |
| Special Weather Statement | 10 |
| Flooding | |
| Flash Flood Watch | 6 |
| Flood Watch | 2 |
| Areal Flood Advisory | 3 |
| River Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 7 |
| Cold | |
| Freeze Warning | 5 |
| Hard Freeze Warning | 1 |
| Freeze Watch | 2 |
| Frost Advisory | 3 |
| Wind and dust | |
| Wind Advisory | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 12 |
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.