Alert archive / Tennessee / Flash Flood Warnings
Flash Flood Warnings in Tennessee, 2024
107 flash flood warnings in 2024. 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 2024. Tap one for its archive.
- Flash Flood Warnings
- 107
- Busiest month
- May44 flash flood warnings
- Busiest day
- May 9, 202416 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.
57 of 107 flash flood warnings covering Tennessee in 2024 had a flash flood report inside them; 107 of 152 flash flood reports fell inside a warning, on average 77 minutes after it went out.
Tennessee, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 107 | 57 | 47% | 152 | 70% | 77 min |
Each office's whole area, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Atlanta, GA: flash flood warnings | 74 | 39 | 47% | 147 | 66% | 167 min |
| NWS Memphis, TN: flash flood warnings | 32 | 17 | 47% | 36 | 78% | 49 min |
| NWS Morristown, TN: flash flood warnings | 61 | 35 | 43% | 92 | 76% | 75 min |
| NWS Huntsville, AL: flash flood warnings | 17 | 5 | 71% | 11 | 55% | 83 min |
| NWS Nashville, TN: flash flood warnings | 34 | 16 | 53% | 54 | 59% | 83 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 9, 8:25 AM CST | Flash Flood Warning | MRX | Blount, Cocke, Sevier | 4 hr |
| Feb 12, 5:25 PM CST | Flash Flood Warning | OHX | DeKalb, Putnam, White | 3 hr |
| May 6, 8:56 PM CDT | Flash Flood Warning | OHX | White | 3 hr |
| May 8, 8:35 AM CDT | Flash Flood Warning | OHX | Montgomery, Stewart | 3 hr |
| May 8, 8:38 AM CDT | Flash Flood Warning | OHX | Cheatham, Davidson, Montgomery, Robertson, Sumner, Trousdale | 3 hr |
| May 8, 10:14 AM CDT | Flash Flood Warning | OHX | Smith, Wilson | 3 hr |
| May 8, 10:54 AM CDT | Flash Flood Warning | OHX | Jackson, Overton, Putnam | 3 hr |
| May 8, 12:01 PM CDT | Flash Flood Warning | MRX | Loudon, Meigs, Rhea, Roane | 119 min |
| May 8, 2:35 PM CDT | Flash Flood Warning | OHX | Cheatham, Davidson, Montgomery, Robertson, Sumner | 3 hr |
| May 8, 3:46 PM CDT | Flash Flood Warning | OHX | Montgomery, Stewart | 3 hr |
| May 8, 4:09 PM CDT | Flash Flood Warning | OHX | Houston, Montgomery, Stewart | 3 hr |
| May 8, 5:31 PM CDT | Flash Flood Warning | OHX | Cheatham, Davidson, Macon, Montgomery, Robertson, Smith and 3 more | 6 hr |
| May 8, 6:56 PM CDT | Flash Flood Warning | OHX | Robertson, Sumner | 15 hr |
| May 8, 7:19 PM CDT | Flash Flood Warning | OHX | Sumner | 15 hr |
| May 8, 7:23 PM CDT | Flash Flood Warning | OHX | Cannon, Cumberland, DeKalb, Putnam, Van Buren, Warren and 1 more | 3 hr |
| May 8, 9:00 PM CDT | Flash Flood Warning | OHX | Cannon, Coffee, Warren | 3 hr |
| May 8, 9:06 PM CDT | Flash Flood Warning | MRX | Bledsoe, Hamilton, Marion, Meigs, Rhea, Sequatchie | 4 hr |
| May 8, 10:22 PM CDT | Flash Flood Warning | OHX | Clay, Fentress, Jackson, Overton, Pickett, Putnam and 1 more | 8 hr |
| May 8, 10:37 PM CDT | Flash Flood Warning | OHX | Cumberland, DeKalb, Putnam, Smith, Van Buren, Warren and 1 more | 8 hr |
| May 8, 10:49 PM CDT | Flash Flood Warning | HUN | Franklin, Lincoln, Moore | 3 hr |
| May 8, 10:51 PM CDT | Flash Flood Warning | OHX | Cannon, Cheatham, Davidson, DeKalb, Rutherford, Smith and 2 more | 8 hr |
| May 8, 11:02 PM CDT | Flash Flood Warning | OHX | Bedford, Cannon, Coffee, Grundy, Rutherford, Van Buren and 1 more | 8 hr |
| May 9, 12:49 AM CDT | Flash Flood Warning | OHX | Cheatham, Dickson, Houston, Montgomery, Robertson, Stewart | 5 hr |
| May 9, 2:06 AM CDT | Flash Flood Warning | OHX | Cheatham, Davidson, Jackson, Macon, Robertson, Smith and 3 more | 6 hr |
| May 9, 2:12 AM CDT | Flash Flood Warning | MEG | Shelby | 3 hr |
| May 9, 3:15 AM CDT | Flash Flood Warning | MRX | Anderson, Campbell, Morgan, Scott | 4 hr |
| May 9, 3:42 AM CDT | Flash Flood Warning | MRX | Bledsoe, Hamilton, Marion, Meigs, Rhea, Sequatchie | 6 hr |
| May 9, 9:55 AM CDT | Flash Flood Warning | OHX | Sumner | 3 hr |
| May 9, 9:58 AM CDT | Flash Flood Warning | OHX | Robertson | 3 hr |
| May 14, 4:53 PM CDT | Flash Flood Warning | OHX | Montgomery, Stewart | 3 hr |
| May 18, 2:21 PM CDT | Flash Flood Warning | MRX | Rhea, Roane | 4 hr |
| May 18, 3:52 PM CDT | Flash Flood Warning | MRX | Anderson, Morgan | 3 hr |
| May 18, 7:15 PM CDT | Flash Flood Warning | MRX | Cocke, Sevier | 4 hr |
| May 22, 1:23 PM CDT | Flash Flood Warning | OHX | Dickson, Houston, Humphreys, Montgomery, Stewart | 9 hr |
| May 22, 5:16 PM CDT | Flash Flood Warning | MEG | Benton, Henry | 3 hr |
| May 23, 7:07 PM CDT | Flash Flood Warning | OHX | Clay, Jackson, Overton, Pickett | 3 hr |
| May 24, 8:56 AM CDT | Flash Flood Warning | MEG | Crockett, Gibson, Madison | 3 hr |
| May 24, 9:59 AM CDT | Flash Flood Warning | MEG | Chester, Hardeman, Madison | 4 hr |
| May 24, 10:29 AM CDT | Flash Flood Warning | MEG | Dyer, Gibson, Obion | 5 hr |
| May 26, 12:15 PM CDT | Flash Flood Warning | MEG | Obion | 3 hr |
| May 26, 2:20 PM CDT | Flash Flood Warning | OHX | Robertson, Sumner | 3 hr |
| May 26, 3:35 PM CDT | Flash Flood Warning | OHX | Williamson | 3 hr |
| May 26, 11:33 PM CDT | Flash Flood Warning | MEG | Henry, Lake, Obion, Weakley | 3 hr |
| May 27, 3:06 AM CDT | Flash Flood Warning | HUN | Franklin, Lincoln | 3 hr |
| May 27, 3:56 AM CDT | Flash Flood Warning | MRX | Bradley, Hamilton | 3 hr |
| May 27, 4:18 AM CDT | Flash Flood Warning | MRX | Sevier | 4 hr |
| Jun 17, 4:12 PM CDT | Flash Flood Warning | MEG | Shelby | 3 hr |
| Jun 30, 4:57 AM CDT | Flash Flood Warning | OHX | Robertson, Sumner | 86 min |
| Jul 8, 10:16 PM CDT | Flash Flood Warning | MRX | Bradley | 3 hr |
| Jul 21, 6:20 PM CDT | Flash Flood Warning | MRX | Hamilton, Meigs | 5 hr |
| Jul 21, 6:50 PM CDT | Flash Flood Warning | MRX | Hamilton | 6 hr |
| Jul 22, 5:36 PM CDT | Flash Flood Warning | MRX | Scott | 3 hr |
| Jul 22, 8:17 PM CDT | Flash Flood Warning | MRX | Blount, Knox, Sevier | 4 hr |
| Jul 23, 1:45 AM CDT | Flash Flood Warning | MRX | McMinn, Monroe | 104 min |
| Jul 24, 2:30 PM CDT | Flash Flood Warning | MRX | Knox | 4 hr |
| Jul 25, 10:26 AM CDT | Flash Flood Warning | MEG | Shelby | 92 min |
| Jul 28, 10:57 AM CDT | Flash Flood Warning | OHX | Macon, Trousdale | 4 hr |
| Jul 28, 4:39 PM CDT | Flash Flood Warning | MRX | Sevier | 5 hr |
| Jul 30, 3:11 PM CDT | Flash Flood Warning | MRX | Blount, Knox, Loudon, Roane | 4 hr |
| Jul 30, 3:56 PM CDT | Flash Flood Warning | MRX | Blount, Loudon, Monroe | 3 hr |
| Jul 30, 4:09 PM CDT | Flash Flood Warning | OHX | Putnam | 3 hr |
| Jul 30, 4:24 PM CDT | Flash Flood Warning | OHX | White | 3 hr |
| Jul 30, 4:48 PM CDT | Flash Flood Warning | MRX | Blount, McMinn, Monroe | 2 hr |
| Jul 30, 8:56 PM CDT | Flash Flood Warning | OHX | Rutherford, Williamson | 2 hr |
| Jul 30, 10:24 PM CDT | Flash Flood Warning | OHX | Bedford, Rutherford | 3 hr |
| Jul 31, 10:03 AM CDT | Flash Flood Warning | MRX | Morgan, Scott | 4 hr |
| Jul 31, 10:56 AM CDT | Flash Flood Warning | OHX | Fentress, Pickett | 2 hr |
| Aug 2, 12:55 PM CDT | Flash Flood Warning | MRX | Carter, Sullivan, Washington | 5 hr |
| Aug 2, 2:26 PM CDT | Flash Flood Warning | MRX | Greene | 4 hr |
| Aug 2, 4:18 PM CDT | Flash Flood Warning | MRX | Claiborne | 3 hr |
| Aug 2, 4:28 PM CDT | Flash Flood Warning | MRX | Campbell, Claiborne, Hancock, Hawkins, Union | 3 hr |
| Aug 2, 6:06 PM CDT | Flash Flood Warning | MRX | Claiborne, Grainger, Hancock, Hawkins, Union | 2 hr |
| Aug 2, 6:30 PM CDT | Flash Flood Warning | MRX | Anderson, Campbell, Knox, Morgan, Scott, Union | 3 hr |
| Aug 16, 5:14 PM CDT | Flash Flood Warning | MRX | Greene, Washington | 3 hr |
| Sep 1, 4:24 PM CDT | Flash Flood Warning | MRX | Sevier | 3 hr |
| Sep 12, 6:51 PM CDT | Flash Flood Warning | MEG | Shelby | 3 hr |
| Sep 12, 7:11 PM CDT | Flash Flood Warning | MEG | Shelby | 3 hr |
| Sep 25, 9:07 AM CDT | Flash Flood Warning | MRX | Blount, Monroe | 5 hr |
| Sep 25, 10:10 AM CDT | Flash Flood Warning | MRX | Hancock, Hawkins | 4 hr |
| Sep 25, 12:25 PM CDT | Flash Flood Warning | MRX | Blount, Monroe, Sevier | 3 hr |
| Sep 25, 1:50 PM CDT | Flash Flood Warning | MRX | Cocke, Greene, Sullivan, Washington | 4 hr |
| Sep 25, 3:15 PM CDT | Flash Flood Warning | MRX | Cocke, Jefferson, Sevier | 3 hr |
| Sep 25, 6:02 PM CDT | Flash Flood Warning | MRX | Cocke, Greene, Hamblen, Hawkins, Jefferson, Sevier and 3 more | 3 hr |
| Sep 25, 6:08 PM CDT | Flash Flood Warning | MRX | Cocke, Jefferson, Sevier | 3 hr |
| Sep 25, 7:10 PM CDT | Flash Flood Warning | MRX | Carter, Johnson, Unicoi | 3 hr |
| Sep 25, 9:03 PM CDT | Flash Flood Warning | MRX | Blount, Cocke, Jefferson, Sevier | 2 hr |
| Sep 25, 10:13 PM CDT | Flash Flood Warning | MRX | Carter, Johnson, Unicoi | 13 hr |
| Sep 26, 10:52 PM CDT | Flash Flood Warning | MRX | Anderson, Blount, Bradley, Knox, Loudon, McMinn and 3 more | 3 hr |
| Sep 27, 6:44 AM CDT | Flash Flood Warning | MRX | Hamilton, Marion, Sequatchie | 4 hr |
| Sep 27, 8:14 AM CDT | Flash Flood Warning | MRX | Carter, Unicoi | 11 hr |
| Sep 27, 8:35 AM CDT | Flash Flood Warning | MRX | Johnson | 10 hr |
| Sep 27, 9:02 AM CDT | Flash Flood Warning | MRX | Carter, Unicoi, Washington | 7 hr |
| Sep 27, 9:36 AM CDT | Flash Flood Warning | MRX | Cocke, Sevier | 7 hr |
| Sep 27, 1:58 PM CDT | Flash Flood Warning | MRX | Hancock, Hawkins | 2 hr |
| Sep 27, 2:30 PM CDT | Flash Flood Warning | MRX | Cocke, Hamblen, Jefferson | 64 min |
| Sep 27, 3:54 PM CDT | Flash Flood Warning | MRX | Carter, Greene, Johnson, Sullivan, Unicoi, Washington | 3 hr |
| Sep 27, 6:29 PM CDT | Flash Flood Warning | MRX | Johnson | 6 hr |
| Sep 27, 6:38 PM CDT | Flash Flood Warning | MRX | Carter, Johnson, Unicoi, Washington | 6 hr |
| Sep 27, 6:50 PM CDT | Flash Flood Warning | MRX | Carter, Sullivan, Unicoi, Washington | 6 hr |
| Sep 27, 10:35 PM CDT | Flash Flood Warning | MRX | Cocke, Greene, Hamblen | 16 hr |
| Sep 28, 12:08 AM CDT | Flash Flood Warning | MRX | Johnson | 9 hr |
| Sep 28, 12:18 AM CDT | Flash Flood Warning | MRX | Carter, Unicoi | 9 hr |
| Sep 28, 12:24 AM CDT | Flash Flood Warning | MRX | Carter, Sullivan, Unicoi, Washington | 9 hr |
| Nov 5, 10:11 PM CST | Flash Flood Warning | MEG | Lauderdale, Tipton | 3 hr |
| Dec 28, 3:30 PM CST | Flash Flood Warning | MEG | Shelby | 105 min |
| Dec 28, 6:24 PM CST | Flash Flood Warning | MEG | Shelby | 3 hr |
| Dec 29, 5:43 AM CST | Flash Flood Warning | MRX | Grainger | 3 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Sevier County12
- Cocke County10
- Carter County10
- Unicoi County10
- Blount County9
- Montgomery County9
- Robertson County9
- Sumner County9
- Washington County9
- Shelby County7
- Johnson County7
- Putnam County6
- Stewart County6
- Cheatham County6
- Smith County6
- Hamilton County6
- Monroe County6
- Sullivan County6
- Greene County6
- White County5
- Davidson County5
- Knox County5
- Hawkins County5
- Jefferson County5
- DeKalb County4
- Trousdale County4
- Wilson County4
- Jackson County4
- Loudon County4
- Meigs County4
- Rhea County4
- Roane County4
- Cannon County4
- Warren County4
- Rutherford County4
- Anderson County4
- Morgan County4
- Scott County4
- Hancock County4
- Overton County3
40 more counties
- Houston County3
- Macon County3
- Van Buren County3
- Marion County3
- Sequatchie County3
- Pickett County3
- Williamson County3
- Campbell County3
- Obion County3
- Bradley County3
- McMinn County3
- Claiborne County3
- Union County3
- Hamblen County3
- Cumberland County2
- Coffee County2
- Bledsoe County2
- Clay County2
- Fentress County2
- Franklin County2
- Lincoln County2
- Bedford County2
- Dickson County2
- Henry County2
- Gibson County2
- Madison County2
- Grainger County2
- Moore County1
- Grundy County1
- Humphreys County1
- Benton County1
- Crockett County1
- Chester County1
- Hardeman County1
- Dyer County1
- Lake County1
- Weakley County1
- Polk County1
- Lauderdale County1
- Tipton County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20232025
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.