Alert archive / Tennessee / Flash Flood Warnings in 2026
Flash Flood Warning 70, NWS Nashville, TN
NWS Nashville, TN issued this flash flood warning at Aug 20, 2026, 4:15 AM CDT for 6 counties in Tennessee. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 20, 2026, 4:15 AM CDT (09:15 UTC)
- Expired
- Aug 20, 2026, 8:15 AM CDT
- In force
- 4 hr
- Issued by
- NWS Nashville, TN
- Area
- Storm-based polygon
- Flood severity
- None
Counties Hickman County, TN, Humphreys County, TN, Lewis County, TN, Maury County, TN, Perry County, TN, Williamson County, TN
The radar
The Ft Campbell radar (KHPX), 108 km from the middle of the area, began a volume at 09:15 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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 00:00Z, 9.3 hours before the alert went out and 109 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
- 310 J/kg
- Mixed-layer CIN
- -212 J/kg
- Mixed-layer LCL
- 1337 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 137 m²/s²
- 0-3 km storm-relative helicity
- 209 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
764
WGUS54 KOHX 200915
FFWOHX
TNC081-085-101-119-135-187-201215-
/O.NEW.KOHX.FF.W.0070.260820T0915Z-260820T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
415 AM CDT Thu Aug 20 2026
The National Weather Service in Nashville has issued a
* Flash Flood Warning for...
Hickman County in Middle Tennessee...
Southern Humphreys County in Middle Tennessee...
Lewis County in Middle Tennessee...
Western Maury County in Middle Tennessee...
Perry County in Middle Tennessee...
West Central Williamson County in Middle Tennessee...
* Until 715 AM CDT.
* At 415 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. The expected rainfall rate is 2 to 3 inches in 1 hour.
Additional rainfall amounts up to 2 inches are possible in the
warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
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, Hohenwald, Centerville, Linden, Mount Pleasant, New
Johnsonville, Hurricane Mills, Lobelville, Nunnelly, Kimmins,
Pinewood, Pleasantville, Bucksnort, Gordonsburg, Lyles, Hampshire,
Bon Aqua, Primm Springs and Williamsport.
This includes the following highways...
Interstate 40 between mile markers 136 and 162. Interstate 840
between mile markers 6 and 20.
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.
&&
LAT...LON 3607 8797 3606 8769 3604 8755 3602 8755
3600 8754 3598 8749 3594 8706 3557 8696
3550 8718 3550 8798 3553 8798 3561 8803
3568 8802 3572 8803 3577 8798 3583 8797
3587 8794 3593 8793 3595 8801 3603 8800
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...2-3 INCHES IN 1 HOUR
$$
Dirkes3 follow-up statements
212
WGUS74 KOHX 201040
FFSOHX
Flash Flood Statement
National Weather Service Nashville TN
540 AM CDT Thu Aug 20 2026
TNC101-119-187-201050-
/O.CAN.KOHX.FF.W.0070.000000T0000Z-260820T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lewis TN-Maury TN-Williamson TN-
540 AM CDT Thu Aug 20 2026
...FLASH FLOOD WARNING IS CANCELLED FOR LEWIS, WESTERN MAURY AND WEST
CENTRAL WILLIAMSON COUNTIES...
Rainfall rates have come down and flash flooding is no longer
expected to pose a threat.
&&
LAT...LON 3607 8797 3606 8769 3604 8755 3600 8754
3598 8749 3595 8720 3594 8720 3572 8723
3572 8725 3565 8776 3569 8802 3572 8803
3577 8798 3583 8797 3587 8794 3591 8793
3594 8793 3595 8801 3603 8800
$$
TNC081-085-135-201215-
/O.CON.KOHX.FF.W.0070.000000T0000Z-260820T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hickman TN-Humphreys TN-Perry TN-
540 AM CDT Thu Aug 20 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 AM CDT THIS
MORNING FOR HICKMAN, SOUTHERN HUMPHREYS AND NORTHERN PERRY
COUNTIES...
At 540 AM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1 and 2 inches of rain have
fallen. The expected rainfall rate is 2 to 3 inches in 1 hour.
Additional rainfall amounts up to 2 inches are possible in the warned
area. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
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...
Centerville, New Johnsonville, Hurricane Mills, Lobelville,
Bucksnort, Pinewood, Nunnelly, Pleasantville, Lyles, Bon Aqua and
Primm Springs.
This includes the following highways...
Interstate 40 between mile markers 136 and 162. Interstate 840 near
mile marker 6.
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.
&&
LAT...LON 3607 8797 3606 8769 3604 8755 3600 8754
3598 8749 3595 8720 3594 8720 3572 8723
3572 8725 3565 8776 3569 8802 3572 8803
3577 8798 3583 8797 3587 8794 3591 8793
3594 8793 3595 8801 3603 8800
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...2-3 INCHES IN 1 HOUR
$$
Dirkes923
WGUS54 KOHX 201154
FFWOHX
TNC081-085-135-201315-
/O.EXT.KOHX.FF.W.0070.000000T0000Z-260820T1315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
654 AM CDT Thu Aug 20 2026
The National Weather Service in Nashville has extended the
* Flash Flood Warning for...
Hickman County in Middle Tennessee...
Southern Humphreys County in Middle Tennessee...
Northern Perry County in Middle Tennessee...
* Until 815 AM CDT.
* At 654 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2.5 and 3.5 inches of
rain have fallen. The expected rainfall rate is 1 inch in 1 hour.
Additional rainfall amounts up to 0.5 inches are possible in the
warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Centerville, Lobelville, Bucksnort, Pinewood, Nunnelly, Lyles, Bon
Aqua and Primm Springs.
This includes Interstate 40 between mile markers 136 and 162.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3595 8801 3598 8749 3595 8720 3594 8721
3594 8720 3593 8720 3574 8725 3574 8732
3569 8778 3572 8803 3577 8798 3583 8797
3586 8794 3587 8794 3591 8793 3594 8793
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1 INCH IN 1 HOUR
$$
Dirkes799
WGUS74 KOHX 201306
FFSOHX
Flash Flood Statement
National Weather Service Nashville TN
806 AM CDT Thu Aug 20 2026
TNC081-085-135-201316-
/O.EXP.KOHX.FF.W.0070.000000T0000Z-260820T1315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hickman TN-Humphreys TN-Perry TN-
806 AM CDT Thu Aug 20 2026
...FLASH FLOOD WARNING WILL EXPIRE AT 815 AM CDT THIS MORNING FOR
HICKMAN, SOUTHERN HUMPHREYS AND NORTHERN PERRY COUNTIES...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
&&
LAT...LON 3595 8801 3598 8749 3595 8720 3594 8721
3594 8720 3593 8720 3574 8725 3574 8732
3569 8778 3572 8803 3577 8798 3583 8797
3586 8794 3587 8794 3591 8793 3594 8793
$$
DirkesWhat forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Nashville, TN wrote its last area forecast discussion before this flash flood warning went out at Aug 20, 12:29 AM CDT, 3 hours 46 minutes earlier. Its key messages:
- Updated at 1229 AM CDT Thu Aug 20 2026
- Slight risk (level 2 out of 5) for severe storms late tonight into early Thursday morning along and north of I-40. Damaging winds and heavy rain are the main concerns.
- Scattered thunderstorms develop again in the afternoon and evening with a low severe weather threat for areas south of I-40.
- Near normal temperatures are expected this weekend.
Area forecast discussion, Aug 20, 12:29 AM CDT, 3 hours 46 minutes before
Area Forecast Discussion National Weather Service Nashville TN 1229 AM CDT Thu Aug 20 2026 ...New AVIATION... .KEY MESSAGES... Updated at 1229 AM CDT Thu Aug 20 2026 - Slight risk (level 2 out of 5) for severe storms late tonight into early Thursday morning along and north of I-40. Damaging winds and heavy rain are the main concerns. - Scattered thunderstorms develop again in the afternoon and evening with a low severe weather threat for areas south of I-40. - Near normal temperatures are expected this weekend. && .SHORT TERM... (Tonight through Friday Night) Issued at 1045 PM CDT Wed Aug 19 2026 Short range models have been a complete mess handling upstream storms over MO and this has complicated our storm forecast for tonight. Latest trends bring storms in later than our previous forecast, perhaps as late as 2 or 3 AM CDT in our northwest. How far south storms develop is also a bit uncertain, but even if the main MCS tracks up in KY, it should still push some outflow storms down into the Mid State. Our far southern counties may not see any rain through the night. A severe risk continues with the storms, mainly damaging wind gusts. A brief tornado cannot be fully ruled out, but storms should be outflow dominant with relatively stable boundary conditions here compared to upstream areas. Local heavy rain will be a concern, mainly in the northwest. Pockets of showers and storms will linger into the morning as a diffuse frontal zone approaches the area. Much of midday will be rain-free. Then, after the atmosphere recovers, additional scattered storms will form along the weak frontal zone as another impulse crosses the area. This time the greatest severe storm and heavy rain potential will be located across our southern and Plateau counties. Local damaging wind gusts will be the concern in the afternoon as capes climb above 2000 with dcape values over 1k. Some additional shortwave energy will cross the area Thursday and Friday with a low chance for more showers and storms, mainly south and Plateau. && .LONG TERM... (Saturday through next Thursday) Issued at 1045 PM CDT Wed Aug 19 2026 Slightly less humid air will move in with temperatures staying around normal through the weekend and into early next week. Rain chances look very low for the weekend. The upper high will push eastward early next week which means temperatures and humidity will start to creep up toward mid next week. && .AVIATION... (06Z TAFS) Issued at 1229 AM CDT Thu Aug 20 2026 Conditions will deteriorate into this morning, with all sites seeing -TSRA through this morning. Afterwards, winds will begin to turn northerly, with ceilings rising. FG will become an issue after 00z on the 21st, slowly settling in as winds go calm. && .PRELIMINARY POINT TEMPS/POPS... Nashville 91 69 90 65 / 40 30 10 0 Clarksville 89 70 89 66 / 50 10 0 0 Crossville 86 66 84 63 / 50 30 30 0 Columbia 93 70 91 67 / 40 30 0 0 Cookeville 86 68 85 65 / 60 30 20 0 Jamestown 85 67 84 64 / 60 40 30 0 Lawrenceburg 92 69 89 66 / 40 30 10 0 Murfreesboro 93 70 91 67 / 40 40 10 0 Waverly 90 70 89 67 / 30 10 0 0 && .OHX WATCHES/WARNINGS/ADVISORIES... None. && SHORT TERM...13 LONG TERM....13 AVIATION.....Holley
In the hours before
Special weather statement, Aug 20, 2:53 AM CDT, 1 hour 22 minutes before
Special Weather Statement
National Weather Service Nashville TN
253 AM CDT Thu Aug 20 2026
TNZ007-008-200830-
Robertson TN-Sumner TN-
253 AM CDT Thu Aug 20 2026
...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN SUMNER AND
NORTHEASTERN ROBERTSON COUNTIES THROUGH 330 AM CDT...
At 253 AM CDT, Doppler radar was tracking a strong thunderstorm near
Cross Plains, or 12 miles northeast of Springfield, moving southeast
at 35 mph.
HAZARD...Wind gusts up to 50 mph and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Gallatin, White House, Cross Plains, Portland, Orlinda,
Mitchellville, Cottontown, and Black Jack.
This includes Interstate 65 between mile markers 109 and 121.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
A Severe Thunderstorm Watch remains in effect until 600 AM CDT for
Middle Tennessee.
&&
LAT...LON 3665 8638 3638 8650 3654 8681 3665 8677
3665 8659 3663 8656 3664 8655 3664 8654
3665 8651
TIME...MOT...LOC 0753Z 295DEG 29KT 3659 8669
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH
HolleySpecial weather statement, Aug 20, 3:17 AM CDT, 58 minutes before
Special Weather Statement
National Weather Service Nashville TN
317 AM CDT Thu Aug 20 2026
TNZ026-027-059-200845-
Williamson TN-Davidson TN-Cheatham TN-
317 AM CDT Thu Aug 20 2026
...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN DAVIDSON...
WILLIAMSON AND SOUTH CENTRAL CHEATHAM COUNTIES THROUGH 345 AM CDT...
At 317 AM CDT, Doppler radar was tracking a strong thunderstorm near
Fairview, or 12 miles west of Franklin, moving east at 45 mph.
HAZARD...Wind gusts up to 50 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Franklin, Brentwood, Spring Hill, Forest Hills, Oak Hill, Belle
Meade, Kingston Springs, Thompson's Station, Pegram, Bellevue,
Fairview, Natchez Trace At Highway 96, and Leipers Fork.
This includes the following highways...
Interstate 40 between mile markers 188 and 198.
Interstate 65 between mile markers 55 and 78.
Interstate 24 near mile marker 57.
Interstate 840 between mile markers 10 and 17, and between mile
markers 22 and 34.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
A Severe Thunderstorm Watch remains in effect until 600 AM CDT for
Middle Tennessee.
&&
LAT...LON 3588 8718 3611 8709 3608 8668 3574 8680
TIME...MOT...LOC 0817Z 282DEG 41KT 3598 8705
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
HolleyThe office that day
Everything else NWS Nashville, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 12:43 AM CDT | Severe Thunderstorm Warning | OHX | Houston, Stewart | 47 min |
| Aug 20, 1:23 AM CDT | Severe Thunderstorm Warning | OHX | Houston, Montgomery, Stewart | 67 min |
| Aug 20, 2:00 AM CDT | Severe Thunderstorm Warning | OHX | Cheatham, Dickson, Houston, Montgomery, Robertson | 60 min |
| Aug 20, 2:53 AM CDT | Special Weather Statement | OHX | Sumner | 37 min |
| Aug 20, 3:17 AM CDT | Special Weather Statement | OHX | Williamson | 28 min |
| Aug 20, 6:02 AM CDT | Special Weather Statement | OHX | Hickman, Maury, Perry | 43 min |
| Aug 20, 6:11 AM CDT | Special Weather Statement | OHX | Montgomery | 34 min |
| Aug 20, 6:52 AM CDT | Flash Flood Warning | OHX | Montgomery | 3 hr |
| Aug 20, 8:30 AM CDT | Special Weather Statement | OHX | Rutherford, Williamson | 45 min |
Nearby
Flash Flood Warnings in Tennessee, 2026Every flash flood warning in 2026
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.