Alert archive / Tennessee / Flash Flood Warnings in 2021
Flash Flood Warning 54, NWS Nashville, TN
NWS Nashville, TN issued this flash flood warning at Aug 21, 2021, 5:07 PM CDT for 4 counties in Tennessee. It was in force for 4 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 21, 2021, 5:07 PM CDT (22:07 UTC)
- Expired
- Aug 21, 2021, 9:00 PM CDT
- In force
- 4 hr
- Issued by
- NWS Nashville, TN
- Area
- Storm-based polygon
- Flood severity
- None
Counties Dickson County, TN, Houston County, TN, Montgomery County, TN, Stewart County, TN
The radar
The Ft Campbell radar (KHPX), 51 km from the middle of the area, began a volume at 22:10 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 21, 6:00 PM CDT | FLASH FLOOD | 5 Nnw Slayden, TN | REPORT OF SWIFT WATER RESCUSES ONGOING AND MULTIPLE ROADS UNDERWATER IN SOUTHERN MONTGOMERY COUNTY. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 10.1 hours before the alert went out and 105 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
- 1243 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 488 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 41 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 1.9
The text
As transmitted.
522
WGUS54 KOHX 212207
FFWOHX
TNC043-083-125-161-220115-
/O.NEW.KOHX.FF.W.0054.210821T2207Z-210822T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
507 PM CDT Sat Aug 21 2021
The National Weather Service in Nashville has issued a
* Flash Flood Warning for...
Northwestern Dickson County in middle Tennessee...
Northern Houston County in middle Tennessee...
Southwestern Montgomery County in middle Tennessee...
Stewart County in middle Tennessee...
* Until 815 PM CDT.
* At 507 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Dover, Erin, Tennessee Ridge, Big Rock, Vanleer, Cumberland City,
Slayden, Indian Mound, Palmyra, Cunningham and Land Between The
Lakes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Move to higher ground now. Act quickly to protect your life.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3664 8806 3661 8783 3644 8725 3636 8727
3635 8728 3632 8729 3632 8727 3621 8730
3626 8768 3633 8791 3644 8806 3647 8805
3649 8806 3651 8804 3654 8803
FLASH FLOOD...RADAR INDICATED
$$
Schaper2 follow-up statements
728
WGUS54 KOHX 212242
FFWOHX
TNC043-083-125-161-220200-
/O.EXT.KOHX.FF.W.0054.000000T0000Z-210822T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
542 PM CDT Sat Aug 21 2021
The National Weather Service in Nashville has extended the
* Flash Flood Warning for...
Northwestern Dickson County in middle Tennessee...
Northern Houston County in middle Tennessee...
Southwestern Montgomery County in middle Tennessee...
Stewart County in middle Tennessee...
* Until 900 PM CDT.
* At 542 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3 inches of rain
have fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Dover, Erin, Tennessee Ridge, Big Rock, Vanleer, Cumberland City,
Slayden, Indian Mound, Palmyra, Cunningham and Land Between The
Lakes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Move to higher ground now. Act quickly to protect your life.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3664 8806 3661 8783 3644 8725 3636 8727
3635 8728 3632 8729 3632 8727 3621 8730
3626 8768 3633 8791 3644 8806 3647 8805
3649 8806 3651 8804 3654 8803
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Schaper270
WGUS74 KOHX 212312
FFSOHX
Flash Flood Statement
National Weather Service Nashville TN
612 PM CDT Sat Aug 21 2021
TNC043-083-212322-
/O.CAN.KOHX.FF.W.0054.000000T0000Z-210822T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Dickson TN-Houston TN-
612 PM CDT Sat Aug 21 2021
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN DICKSON AND
NORTHERN HOUSTON COUNTIES...
A new Flash Flood Warning has been issued for the affected area,
with numerous reports of flash flooding ongoing.
A Flash Flood Watch remains in effect until 1200 AM CDT for a
portion of Middle Tennessee.
LAT...LON 3664 8806 3661 8783 3644 8725 3638 8759
3637 8759 3637 8772 3635 8774 3634 8790
3635 8794 3644 8806 3647 8805 3649 8806
3651 8804 3654 8803
$$
TNC125-161-220200-
/O.CON.KOHX.FF.W.0054.000000T0000Z-210822T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery TN-Stewart TN-
612 PM CDT Sat Aug 21 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 9 PM CDT THIS EVENING
FOR WEST CENTRAL MONTGOMERY AND STEWART COUNTIES...
At 612 PM CDT, Emergency management reported flash flooding ongoing
across the warned area with numerous water rescues in progress in
southern Montgomery County. Between 3 and 6 inches of rain have
fallen so far today.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Emergency management reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Dover, Big Rock, Cumberland City, Indian Mound, Land Between The
Lakes and Palmyra.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to higher ground now. Act quickly to protect your life.
&&
LAT...LON 3664 8806 3661 8783 3644 8725 3638 8759
3637 8759 3637 8772 3635 8774 3634 8790
3635 8794 3644 8806 3647 8805 3649 8806
3651 8804 3654 8803
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
ShamburgerThe office that day
Everything else NWS Nashville, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 2:48 AM CDT | Areal Flood Advisory | OHX | Dickson, Hickman, Humphreys, Lewis | 2 hr |
| Aug 21, 3:29 AM CDT | Flash Flood Warning | OHX | Dickson, Hickman, Humphreys | 5 hr |
| Aug 21, 4:10 AM CDT | Areal Flood Advisory | OHX | Giles, Lawrence, Lewis, Maury | 3 hr |
| Aug 21, 4:29 AM CDT | Areal Flood Advisory | OHX | Montgomery, Stewart | 3 hr |
| Aug 21, 4:49 AM CDT | Flash Flood Warning | OHX | Dickson, Hickman, Houston, Humphreys | 3 hr |
| Aug 21, 6:24 AM CDT | Flash Flood Warning | OHX | Houston, Humphreys, Stewart | 5 hr |
| Aug 21, 7:47 AM CDT | Flash Flood Warning | OHX | Dickson, Hickman, Houston, Humphreys | 9 hr |
| Aug 21, 8:39 AM CDT | River Flood Warning | OHX | Hickman | 13 hr |
| Aug 21, 9:41 AM CDT | Areal Flood Advisory | OHX | Hickman, Lewis, Maury | 3 hr |
| Aug 21, 10:12 AM CDT | Flash Flood Warning | OHX | Hickman, Humphreys, Lewis, Maury, Perry | 3 hr |
| Aug 21, 10:17 AM CDT | River Flood Advisory | OHX | Hickman | 52 hr |
| Aug 21, 11:39 AM CDT | Areal Flood Advisory | OHX | Giles, Lawrence, Marshall | 3 hr |
| Aug 21, 12:33 PM CDT | River Flood Warning | OHX | Humphreys | 44 hr |
| Aug 21, 4:40 PM CDT | Areal Flood Advisory | OHX | Houston, Stewart | 3 hr |
| Aug 21, 4:55 PM CDT | Flash Flood Warning | OHX | Dickson, Hickman, Houston, Humphreys | 6 hr |
| Aug 21, 5:10 PM CDT | Special Weather Statement | OHX | Houston, Stewart | 50 min |
| Aug 21, 5:30 PM CDT | Special Weather Statement | OHX | Dickson, Houston | 45 min |
| Aug 21, 5:43 PM CDT | Special Weather Statement | OHX | Lawrence | 47 min |
| Aug 21, 5:57 PM CDT | Tornado Warning | OHX | Dickson | 16 min |
| Aug 21, 5:58 PM CDT | Flash Flood Warning | OHX | Cheatham, Dickson, Houston, Montgomery | 3 hr |
| Aug 21, 6:17 PM CDT | Special Weather Statement | OHX | Dickson | 43 min |
| Aug 21, 6:29 PM CDT | Special Weather Statement | OHX | Hickman | 31 min |
| Aug 21, 6:53 PM CDT | Special Weather Statement | OHX | Williamson | 37 min |
Nearby
Flash Flood Warnings in Tennessee, 2021Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.