Alert archive / Tennessee / Flash Flood Watches in 2021
Flash Flood Watch 6, NWS Nashville, TN
NWS Nashville, TN issued this flash flood watch at Aug 20, 2021, 4:55 PM CDT for 16 counties in Tennessee. It took effect at Aug 21, 2021, 1:00 AM CDT. It was in force for 22 hr.
The area
The counties it named.
The facts
- Issued
- Aug 20, 2021, 4:55 PM CDT (21:55 UTC)
- In effect from
- Aug 21, 2021, 1:00 AM CDT
- Expired
- Aug 21, 2021, 10:47 PM CDT
- In force
- 22 hr
- Issued by
- NWS Nashville, TN
- Flood severity
- None
Counties Bedford County, TN, Cheatham County, TN, Dickson County, TN, Giles County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lawrence County, TN, Lewis County, TN, Marshall County, TN, Maury County, TN, Montgomery County, TN, Perry County, TN, Stewart County, TN, Wayne County, TN, Williamson County, TN
The radar
The Nashville radar (KOHX), 85 km from the middle of the area, began a volume at 21:58 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 9.9 hours before the alert went out and 76 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 892 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 556 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 66 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
691 WGUS64 KOHX 202155 FFAOHX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Nashville TN 455 PM CDT Fri Aug 20 2021 TNZ005-006-023>026-056>061-075-093>095-211800- /O.NEW.KOHX.FF.A.0006.210821T0600Z-210821T1800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Stewart-Montgomery-Houston-Humphreys-Dickson-Cheatham-Perry-Hickman- Lewis-Williamson-Maury-Marshall-Bedford-Wayne-Lawrence-Giles- Including the cities of McEwen, Clarksville, Pulaski, Linden, Waverly, Columbia, Brentwood, Kingston Springs, Ashland City, Dickson, Waynesboro, New Johnsonville, Franklin, Lewisburg, Tennessee Ridge, Dover, Lawrenceburg, Lobelville, Clifton, Erin, Hohenwald, Centerville, and Shelbyville 455 PM CDT Fri Aug 20 2021 ...FLASH FLOOD WATCH IN EFFECT FROM 1 AM CDT SATURDAY THROUGH SATURDAY AFTERNOON... The National Weather Service in Nashville has issued a * Flash Flood Watch for a portion of Middle Tennessee, including the following areas, Bedford, Cheatham, Dickson, Giles, Hickman, Houston, Humphreys, Lawrence, Lewis, Marshall, Maury, Montgomery, Perry, Stewart, Wayne and Williamson. * From 1 AM CDT Saturday through Saturday afternoon. * 2 To 5 inches of rain have fallen across many locations in the watch area over the past few days. Additional showers and thunderstorms are expected to develop after midnight tonight through the morning hours Saturday, resulting in an additional 2 to 4 inches of rain possible. Higher amounts may be possible with training of heavier showers and storms. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Barnwell
4 follow-up statements
842 WGUS64 KOHX 210640 FFAOHX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Nashville TN 140 AM CDT Sat Aug 21 2021 TNZ005-006-023>026-056>061-075-093>095-211445- /O.EXT.KOHX.FF.A.0006.000000T0000Z-210821T2000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Stewart-Montgomery-Houston-Humphreys-Dickson-Cheatham-Perry-Hickman- Lewis-Williamson-Maury-Marshall-Bedford-Wayne-Lawrence-Giles- Including the cities of McEwen, Clarksville, Pulaski, Linden, Waverly, Columbia, Brentwood, Kingston Springs, Ashland City, Dickson, Waynesboro, New Johnsonville, Franklin, Lewisburg, Tennessee Ridge, Dover, Lawrenceburg, Lobelville, Clifton, Erin, Hohenwald, Centerville, and Shelbyville 140 AM CDT Sat Aug 21 2021 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH 3 PM CDT THIS AFTERNOON... The Flash Flood Watch is now in effect for * A portion of Middle Tennessee, including the following areas, Bedford, Cheatham, Dickson, Giles, Hickman, Houston, Humphreys, Lawrence, Lewis, Marshall, Maury, Montgomery, Perry, Stewart, Wayne and Williamson. * Through this afternoon. * 2 To 5 inches of rain have fallen across many locations in the watch area over the past few days. Additional showers and thunderstorms are expected to develop after midnight tonight through the morning hours Saturday, resulting in an additional 2 to 4 inches of rain possible. Higher amounts may be possible with training of heavier showers and storms. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ 07
449 WGUS64 KOHX 211500 FFAOHX Flood Watch National Weather Service Nashville TN 1000 AM CDT Sat Aug 21 2021 TNZ005-006-023>026-056>061-075-093>095-212000- /O.CON.KOHX.FF.A.0006.000000T0000Z-210821T2000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Stewart-Montgomery-Houston-Humphreys-Dickson-Cheatham-Perry-Hickman- Lewis-Williamson-Maury-Marshall-Bedford-Wayne-Lawrence-Giles- Including the cities of McEwen, Clarksville, Pulaski, Linden, Waverly, Columbia, Brentwood, Kingston Springs, Ashland City, Dickson, Waynesboro, New Johnsonville, Franklin, Lewisburg, Tennessee Ridge, Dover, Lawrenceburg, Lobelville, Clifton, Erin, Hohenwald, Centerville, and Shelbyville 1000 AM CDT Sat Aug 21 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 3 PM CDT THIS AFTERNOON... The Flash Flood Watch continues for * A portion of Middle Tennessee, including the following areas, Bedford, Cheatham, Dickson, Giles, Hickman, Houston, Humphreys, Lawrence, Lewis, Marshall, Maury, Montgomery, Perry, Stewart, Wayne and Williamson. * Until 3 PM CDT this afternoon. * A total of 6 to 12 inches of rain has already fallen in portions of the Flash Flood Watch causing catastrophic flooding including closed and washed out roads, water rescues, and homes and business inundated with water. Another 2 to possibly 4 inches of rain is expected in portions of the watch area. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Hurley
038 WGUS64 KOHX 211932 FFAOHX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Nashville TN 232 PM CDT Sat Aug 21 2021 TNZ005-006-023>026-056>061-075-093>095-220500- /O.EXT.KOHX.FF.A.0006.000000T0000Z-210822T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Stewart-Montgomery-Houston-Humphreys-Dickson-Cheatham-Perry-Hickman- Lewis-Williamson-Maury-Marshall-Bedford-Wayne-Lawrence-Giles- Including the cities of McEwen, Clarksville, Pulaski, Linden, Waverly, Columbia, Brentwood, Kingston Springs, Ashland City, Dickson, Waynesboro, New Johnsonville, Franklin, Lewisburg, Tennessee Ridge, Dover, Lawrenceburg, Lobelville, Clifton, Erin, Hohenwald, Centerville, and Shelbyville 232 PM CDT Sat Aug 21 2021 ...FLASH FLOOD WATCH NOW IN EFFECT UNTIL MIDNIGHT CDT TONIGHT... The Flash Flood Watch is now in effect for * A portion of Middle Tennessee, including the following areas, Bedford, Cheatham, Dickson, Giles, Hickman, Houston, Humphreys, Lawrence, Lewis, Marshall, Maury, Montgomery, Perry, Stewart, Wayne and Williamson. * Until Midnight CDT tonight. * A total of 8 to 14 inches of rain has fallen in portions of the Flash Flood Watch, causing catastrophic flooding. Flash flooding has washed out roads, inundated homes and businesses, and led to numerous water rescues. Storms that redevelop over similar locations this evening could produce an additional 1 to 2 inches with locally higher amounts. Additional rainfall in areas where significant flooding is still occurring will exacerbate the flash flood threat. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Schaper
824 WGUS64 KOHX 220347 FFAOHX Flood Watch National Weather Service Nashville TN 1047 PM CDT Sat Aug 21 2021 TNZ005-006-023>026-056>061-075-093>095-220500- /O.CAN.KOHX.FF.A.0006.000000T0000Z-210822T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Stewart-Montgomery-Houston-Humphreys-Dickson-Cheatham-Perry-Hickman- Lewis-Williamson-Maury-Marshall-Bedford-Wayne-Lawrence-Giles- Including the cities of McEwen, Clarksville, Pulaski, Linden, Waverly, Columbia, Brentwood, Kingston Springs, Ashland City, Dickson, Waynesboro, New Johnsonville, Franklin, Lewisburg, Tennessee Ridge, Dover, Lawrenceburg, Lobelville, Clifton, Erin, Hohenwald, Centerville, and Shelbyville 1047 PM CDT Sat Aug 21 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for a portion of Middle Tennessee, including the following areas, Bedford, Cheatham, Dickson, Giles, Hickman, Houston, Humphreys, Lawrence, Lewis, Marshall, Maury, Montgomery, Perry, Stewart, Wayne and Williamson has been cancelled. Additional rainfall is not expected overnight, but ponding on roads and standing water will remain for many areas into Sunday. Creeks, streams, and rivers will likely remain elevated overnight and into Sunday, but will slowly recede. Please continue to heed remaining road closures. $$ Barnwell
The office that day
Everything else NWS Nashville, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 7:17 PM CDT | Areal Flood Advisory | OHX | Lawrence | 3 hr |
Nearby
Flash Flood Watches in Tennessee, 2021Every flash flood watch in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.