Alert archive / Tennessee / Flash Flood Warnings
Flash Flood Warnings in Tennessee, 2022
72 flash flood warnings in 2022. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of flash flood warnings reaches back to 1986.
Flash Flood Warnings by county
Each county as a circle sized by its count in 2022. Tap one for its archive.
- Flash Flood Warnings
- 72
- Busiest month
- August24 flash flood warnings
- Busiest day
- August 10, 20228 flash flood warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
33 of 72 flash flood warnings covering Tennessee in 2022 had a flash flood report inside them; 70 of 95 flash flood reports fell inside a warning, on average 60 minutes after it went out.
Tennessee, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 72 | 33 | 54% | 95 | 74% | 60 min |
Each office's whole area, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Atlanta, GA: flash flood warnings | 42 | 14 | 67% | 92 | 66% | 238 min |
| NWS Nashville, TN: flash flood warnings | 16 | 6 | 63% | 26 | 77% | 63 min |
| NWS Memphis, TN: flash flood warnings | 19 | 6 | 68% | 15 | 60% | 58 min |
| NWS Huntsville, AL: flash flood warnings | 52 | 11 | 79% | 36 | 61% | 38 min |
| NWS Morristown, TN: flash flood warnings | 51 | 27 | 47% | 66 | 82% | 91 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 | Counties | Lasted |
|---|---|---|---|---|
| Jan 1, 5:28 PM CST | Flash Flood Warning | HUN | Lincoln, Moore | 66 min |
| Feb 22, 7:06 PM CST | Flash Flood Warning | OHX | Giles, Lawrence, Marshall, Wayne | 114 min |
| Feb 22, 7:07 PM CST | Flash Flood Warning | HUN | Lincoln, Moore | 3 hr |
| Feb 22, 7:38 PM CST | Flash Flood Warning | HUN | Franklin, Lincoln, Moore | 2 hr |
| Feb 22, 8:53 PM CST | Flash Flood Warning | HUN | Franklin, Lincoln, Moore | 4 hr |
| Feb 24, 9:16 AM CST | Flash Flood Warning | MRX | Greene, Hamblen, Hawkins | 3 hr |
| Feb 24, 9:54 AM CST | Flash Flood Warning | MRX | Greene, Hawkins, Sullivan, Washington | 4 hr |
| Feb 24, 9:56 AM CST | Flash Flood Warning | MRX | Hawkins, Sullivan | 4 hr |
| Feb 24, 9:58 AM CST | Flash Flood Warning | MRX | Cocke, Greene, Hamblen, Jefferson | 4 hr |
| Feb 24, 10:03 AM CST | Flash Flood Warning | MRX | Grainger, Hamblen, Jefferson, Knox, Union | 4 hr |
| Apr 6, 7:00 PM CDT | Flash Flood Warning | MRX | Polk | 2 hr |
| Apr 13, 4:27 PM CDT | Flash Flood Warning | MEG | Lauderdale, Tipton | 4 hr |
| Apr 13, 4:37 PM CDT | Flash Flood Warning | MEG | Shelby | 4 hr |
| Apr 13, 6:38 PM CDT | Flash Flood Warning | MEG | Crockett, Fayette, Hardeman, Haywood, Henderson, Madison | 3 hr |
| Apr 25, 9:21 AM CDT | Flash Flood Warning | MEG | Shelby | 105 min |
| May 6, 1:23 PM CDT | Flash Flood Warning | MRX | Blount, Knox, Loudon, Monroe, Sevier | 3 hr |
| Jun 2, 6:15 PM CDT | Flash Flood Warning | OHX | Lawrence, Wayne | 6 hr |
| Jun 2, 8:27 PM CDT | Flash Flood Warning | OHX | Cannon, Rutherford | 3 hr |
| Jun 7, 3:28 PM CDT | Flash Flood Warning | HUN | Franklin, Lincoln, Moore | 2 hr |
| Jun 7, 5:43 PM CDT | Flash Flood Warning | OHX | DeKalb, Jackson, Putnam, Smith, White, Wilson | 3 hr |
| Jul 6, 4:28 PM CDT | Flash Flood Warning | MRX | Morgan | 2 hr |
| Jul 6, 6:53 PM CDT | Flash Flood Warning | MRX | Monroe | 112 min |
| Jul 9, 9:19 PM CDT | Flash Flood Warning | MRX | Campbell, Scott, Union | 3 hr |
| Jul 9, 9:48 PM CDT | Flash Flood Warning | MRX | Claiborne | 3 hr |
| Jul 12, 10:16 PM CDT | Flash Flood Warning | MRX | Cocke, Sevier | 3 hr |
| Jul 12, 10:20 PM CDT | Flash Flood Warning | OHX | Giles, Marshall, Maury | 115 min |
| Jul 17, 4:52 PM CDT | Flash Flood Warning | OHX | Cumberland | 98 min |
| Jul 18, 10:16 PM CDT | Flash Flood Warning | OHX | Smith, Trousdale | 119 min |
| Jul 20, 9:24 PM CDT | Flash Flood Warning | MRX | Anderson, Knox | 5 hr |
| Jul 20, 11:05 PM CDT | Flash Flood Warning | MRX | Anderson, Knox | 3 hr |
| Jul 21, 1:47 AM CDT | Flash Flood Warning | MRX | Anderson, Knox | 6 hr |
| Jul 21, 2:46 AM CDT | Flash Flood Warning | OHX | Clay, Fentress, Overton, Pickett | 3 hr |
| Jul 21, 3:26 AM CDT | Flash Flood Warning | OHX | Clay, Fentress, Jackson, Overton, Putnam | 3 hr |
| Jul 23, 5:36 PM CDT | Flash Flood Warning | MRX | Campbell, Scott | 3 hr |
| Jul 23, 11:11 PM CDT | Flash Flood Warning | MRX | Sevier | 3 hr |
| Jul 25, 5:43 PM CDT | Flash Flood Warning | MRX | Claiborne | 3 hr |
| Jul 25, 6:55 PM CDT | Flash Flood Warning | MRX | Morgan, Roane | 5 hr |
| Jul 25, 8:02 PM CDT | Flash Flood Warning | MRX | Roane | 4 hr |
| Jul 28, 4:13 PM CDT | Flash Flood Warning | OHX | Fentress | 3 hr |
| Jul 31, 12:31 PM CDT | Flash Flood Warning | MRX | Campbell, Scott | 3 hr |
| Jul 31, 8:34 PM CDT | Flash Flood Warning | MRX | Anderson, Blount, Jefferson, Knox, Loudon, Roane and 1 more | 4 hr |
| Jul 31, 11:08 PM CDT | Flash Flood Warning | MRX | Claiborne, Hancock, Hawkins | 3 hr |
| Aug 5, 6:58 AM CDT | Flash Flood Warning | MEG | Carroll, Henry, Weakley | 3 hr |
| Aug 5, 4:43 PM CDT | Flash Flood Warning | MRX | Loudon, McMinn, Monroe | 3 hr |
| Aug 5, 5:22 PM CDT | Flash Flood Warning | MEG | Shelby | 43 min |
| Aug 6, 6:06 PM CDT | Flash Flood Warning | OHX | Fentress, Overton | 114 min |
| Aug 6, 7:11 PM CDT | Flash Flood Warning | MRX | Hamilton | 3 hr |
| Aug 6, 7:56 PM CDT | Flash Flood Warning | MRX | Bledsoe, Rhea | 3 hr |
| Aug 8, 2:39 PM CDT | Flash Flood Warning | MRX | Polk | 87 min |
| Aug 9, 3:26 PM CDT | Flash Flood Warning | MRX | Meigs, Rhea | 2 hr |
| Aug 10, 9:58 AM CDT | Flash Flood Warning | MRX | Bradley, Hamilton, Meigs, Rhea | 3 hr |
| Aug 10, 10:02 AM CDT | Flash Flood Warning | MRX | Hamilton, Marion | 6 hr |
| Aug 10, 10:58 AM CDT | Flash Flood Warning | MRX | Bledsoe, Hamilton, Marion, Sequatchie | 4 hr |
| Aug 10, 11:36 AM CDT | Flash Flood Warning | OHX | Bedford, Giles, Marshall, Maury | 2 hr |
| Aug 10, 2:31 PM CDT | Flash Flood Warning | MRX | Cocke, Greene | 3 hr |
| Aug 10, 3:15 PM CDT | Flash Flood Warning | MRX | Greene, Hamblen, Hawkins | 3 hr |
| Aug 10, 3:42 PM CDT | Flash Flood Warning | MRX | Carter, Sullivan, Unicoi, Washington | 3 hr |
| Aug 10, 4:21 PM CDT | Flash Flood Warning | MRX | Carter, Johnson, Sullivan | 3 hr |
| Aug 11, 12:26 AM CDT | Flash Flood Warning | MRX | Marion, Sequatchie | 2 hr |
| Aug 15, 4:24 PM CDT | Flash Flood Warning | MRX | Carter | 3 hr |
| Aug 26, 7:06 AM CDT | Flash Flood Warning | MRX | Hamblen | 4 hr |
| Aug 26, 2:38 PM CDT | Flash Flood Warning | MRX | Bledsoe, Rhea | 3 hr |
| Aug 26, 4:19 PM CDT | Flash Flood Warning | MRX | Bledsoe, Sequatchie | 3 hr |
| Aug 29, 2:59 PM CDT | Flash Flood Warning | OHX | Cheatham, Davidson, Robertson, Sumner | 2 hr |
| Sep 3, 2:08 AM CDT | Flash Flood Warning | OHX | Maury | 3 hr |
| Sep 3, 5:13 PM CDT | Flash Flood Warning | OHX | Cheatham, Davidson, Robertson, Sumner | 2 hr |
| Sep 3, 10:29 PM CDT | Flash Flood Warning | OHX | DeKalb, Putnam, Warren | 3 hr |
| Sep 4, 3:07 AM CDT | Flash Flood Warning | HUN | Franklin, Moore | 5 hr |
| Sep 4, 5:25 AM CDT | Flash Flood Warning | MRX | Bledsoe, Sequatchie | 5 hr |
| Sep 4, 9:32 AM CDT | Flash Flood Warning | MRX | Bledsoe, Rhea | 3 hr |
| Sep 4, 3:21 PM CDT | Flash Flood Warning | MEG | Hardin | 3 hr |
| Sep 6, 1:53 PM CDT | Flash Flood Warning | MEG | Decatur | 3 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Moore County6
- Knox County6
- Bledsoe County6
- Lincoln County5
- Greene County5
- Hamblen County5
- Hawkins County5
- Rhea County5
- Franklin County4
- Sullivan County4
- Sevier County4
- Anderson County4
- Fentress County4
- Hamilton County4
- Sequatchie County4
- Giles County3
- Marshall County3
- Cocke County3
- Jefferson County3
- Shelby County3
- Loudon County3
- Monroe County3
- Putnam County3
- Campbell County3
- Scott County3
- Claiborne County3
- Maury County3
- Overton County3
- Roane County3
- Marion County3
- Carter County3
- Lawrence County2
- Wayne County2
- Washington County2
- Union County2
- Polk County2
- Blount County2
- DeKalb County2
- Jackson County2
- Smith County2
35 more counties
- Morgan County2
- Clay County2
- Meigs County2
- Cheatham County2
- Davidson County2
- Robertson County2
- Sumner County2
- Grainger County1
- Lauderdale County1
- Tipton County1
- Crockett County1
- Fayette County1
- Hardeman County1
- Haywood County1
- Henderson County1
- Madison County1
- Cannon County1
- Rutherford County1
- White County1
- Wilson County1
- Cumberland County1
- Trousdale County1
- Pickett County1
- Hancock County1
- Carroll County1
- Henry County1
- Weakley County1
- McMinn County1
- Bradley County1
- Bedford County1
- Unicoi County1
- Johnson County1
- Warren County1
- Hardin County1
- Decatur County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20212023
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.