Alert archive / Tennessee / Flash Flood Warnings in 2021
Flash Flood Warning 56, NWS Nashville, TN
NWS Nashville, TN issued this flash flood warning at Aug 21, 2021, 7:24 PM CDT for Marshall County, Maury County, Williamson County, Tennessee. It was in force for 4 hr. 2 reports 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, 7:24 PM CDT (00:24 UTC)
- Expired
- Aug 21, 2021, 11:00 PM CDT
- In force
- 4 hr
- Issued by
- NWS Nashville, TN
- Area
- Storm-based polygon
- Flood severity
- None
Counties Marshall County, TN, Maury County, TN, Williamson County, TN
The radar
The Nashville radar (KOHX), 69 km from the middle of the area, began a volume at 00:24 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, 7:52 PM CDT | FLASH FLOOD | Santa Fe, TN | SANTE FE PIKE IS FLOODED AND IMPASSABLE |
| Aug 21, 9:05 PM CDT | FLASH FLOOD | 4 Se Santa Fe, TN | KNOB CREEK ROAD AT HIGHWAY 7 AND POLK LANE AT REESE CHURCH ROAD BOTH FLOODED AND IMPASSABLE |
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 00:00Z, 0.4 hours before the alert went out and 57 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
- 239 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 947 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 69 m²/s²
- 0-3 km storm-relative helicity
- 60 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted.
098
WGUS54 KOHX 220024
FFWOHX
TNC117-119-187-220330-
/O.NEW.KOHX.FF.W.0056.210822T0024Z-210822T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
724 PM CDT Sat Aug 21 2021
The National Weather Service in Nashville has issued a
* Flash Flood Warning for...
North Central Marshall County in middle Tennessee...
Northern Maury County in middle Tennessee...
Southwestern Williamson County in middle Tennessee...
* Until 1030 PM CDT.
* At 724 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. 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...
Carters Creek including areas near Spring Hill and Neapolis, Snow
Creek including Santa Fe, Leipers Creek including McKnight and
fly, Columbia, Thompson's Station, I-65 East Of Columbia, and
Williamsport.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3583 8708 3574 8671 3559 8681 3569 8724
3581 8719
FLASH FLOOD...RADAR INDICATED
$$
LaRosa1 follow-up statement
921
WGUS54 KOHX 220232
FFWOHX
TNC117-119-187-220400-
/O.EXT.KOHX.FF.W.0056.000000T0000Z-210822T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
932 PM CDT Sat Aug 21 2021
The National Weather Service in Nashville has extended the
* Flash Flood Warning for...
North Central Marshall County in middle Tennessee...
Northern Maury County in middle Tennessee...
Southwestern Williamson County in middle Tennessee...
* Until 1100 PM CDT.
* At 932 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Columbia, Spring Hill, Thompson's Station, I-65 East Of Columbia,
Santa Fe and Williamsport.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3583 8708 3574 8671 3559 8681 3569 8724
3581 8719
FLASH FLOOD...RADAR INDICATED
$$
BarnwellThe office that day
Everything else NWS Nashville, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 7:03 PM CDT | Areal Flood Advisory | OHX | Giles, Hickman, Lawrence, Lewis, Marshall, Maury and 1 more | 4 hr |
| Aug 21, 7:22 PM CDT | Special Weather Statement | OHX | Maury | 38 min |
| Aug 21, 7:43 PM CDT | Flash Flood Warning | OHX | Lewis, Marshall, Maury | 3 hr |
| Aug 21, 9:11 PM CDT | Areal Flood Advisory | OHX | Bedford, Cannon, Coffee, Marshall, Rutherford, Warren | 3 hr |
| Aug 21, 9:59 PM CDT | River Flood Advisory | OHX | Hickman | 14 hr |
| Aug 21, 10:34 PM CDT | Areal Flood Advisory | OHX | Dickson, Hickman, Houston, Humphreys | 10 hr |
| Aug 22, 12:33 AM CDT | River Flood Advisory | OHX | Lawrence | 6 hr |
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.