Alert archive / Tennessee / Areal Flood Advisories in 2021
Areal Flood Advisory 48, NWS Nashville, TN
NWS Nashville, TN issued this areal flood advisory at Jul 17, 2021, 11:19 PM CDT for Smith County, Trousdale County, Tennessee. It was in force for 116 min.
The area
The counties it named.
The facts
- Issued
- Jul 17, 2021, 11:19 PM CDT (04:19 UTC)
- Expired
- Jul 18, 2021, 1:15 AM CDT
- In force
- 116 min
- Issued by
- NWS Nashville, TN
- Area
- Storm-based polygon
Counties Smith County, TN, Trousdale County, TN
The radar
The Nashville radar (KOHX), 46 km from the middle of the area, began a volume at 04:22 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
Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 4.3 hours before the alert went out and 358 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
- 849 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 1169 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 46 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this areal flood advisory 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 areal flood advisory went out at Jul 17, 9:58 PM CDT, 1 hour 21 minutes earlier.
Area forecast discussion, Jul 17, 9:58 PM CDT, 1 hour 21 minutes before
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</html>Hazardous weather outlook, Jul 17, 2:48 AM CDT, 20 hours 31 minutes before
Hazardous Weather Outlook National Weather Service Nashville TN 248 AM CDT Sat Jul 17 2021 TNZ005>011-023>034-056>066-075-077>080-093>095-181030- Stewart-Montgomery-Robertson-Sumner-Macon-Clay-Pickett-Houston- Humphreys-Dickson-Cheatham-Davidson-Wilson-Trousdale-Smith-Jackson- Putnam-Overton-Fentress-Perry-Hickman-Lewis-Williamson-Maury- Marshall-Rutherford-Cannon-De Kalb-White-Cumberland-Bedford-Coffee- Warren-Grundy-Van Buren-Wayne-Lawrence-Giles- 248 AM CDT Sat Jul 17 2021 This Hazardous Weather Outlook is for Middle Tennessee. .DAY ONE...Today and tonight. Scattered to numerous showers and thunderstorms are expected across the area later today and early tonight. Isolated storms could be strong with gusty winds and locally heavy rain...especially across the east. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Scattered to numerous showers and thunderstorms are expected across Middle Tennessee Sunday as well. A few storms could be strong with gusty winds and locally heavy rain. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. 07
In the hours before
Special weather statement, Jul 17, 6:31 PM CDT, 4 hours 48 minutes before
Special Weather Statement
National Weather Service Nashville TN
631 PM CDT Sat Jul 17 2021
TNZ028-029-180000-
Wilson TN-Trousdale TN-
631 PM CDT Sat Jul 17 2021
...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN WILSON AND SOUTHWESTERN
TROUSDALE COUNTIES UNTIL 700 PM CDT...
At 630 PM CDT, Doppler radar was tracking a strong thunderstorm near
Lebanon, moving southeast at 20 mph.
Winds in excess of 40 mph will be possible with this storm.
Locations impacted include...
Old Hickory Lake, Lebanon, Hartsville, Tuckers Crossroads and
Dickerson Chapel Recreation Area.
This includes the following highways...
Interstate 40 between mile markers 232 and 245.
Interstate 840 between mile markers 73 and 76.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3621 8611 3611 8638 3629 8648 3631 8643
3631 8639 3632 8639 3634 8635 3631 8636
3632 8634 3631 8630 3634 8629 3636 8628
3640 8618
TIME...MOT...LOC 2330Z 331DEG 16KT 3625 8628
05Special weather statement, Jul 17, 6:58 PM CDT, 4 hours 21 minutes before
Special Weather Statement
National Weather Service Nashville TN
658 PM CDT Sat Jul 17 2021
TNZ028-030-180030-
Wilson TN-Smith TN-
658 PM CDT Sat Jul 17 2021
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN SMITH AND CENTRAL
WILSON COUNTIES UNTIL 730 PM CDT...
At 657 PM CDT, Doppler radar was tracking a strong thunderstorm near
Lebanon, moving southeast at 15 mph.
Winds in excess of 40 mph will be possible with this storm.
Locations impacted include...
Lebanon, Watertown, Cedars Of Lebanon State Park, Tuckers Crossroads
and Gladeville.
This includes the following highways...
Interstate 40 between mile markers 230 and 257.
Interstate 840 between mile markers 70 and 76.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3613 8595 3601 8638 3624 8648 3631 8616
3629 8613 3632 8611 3634 8604
TIME...MOT...LOC 2357Z 324DEG 12KT 3623 8623
05Local storm report, Jul 17, 9:11 PM CDT, 2 hours 8 minutes before
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</html>Local storm report, Jul 17, 10:23 PM CDT, 56 minutes before
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</html>Local storm report, Jul 17, 10:25 PM CDT, 54 minutes before
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</html>The office that day
Everything else NWS Nashville, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 7:16 PM CDT | Areal Flood Advisory | OHX | Wilson | 119 min |
| Jul 17, 7:38 PM CDT | Areal Flood Advisory | OHX | Lawrence | 112 min |
| Jul 17, 8:00 PM CDT | Flash Flood Warning | OHX | Lawrence | 3 hr |
| Jul 17, 8:40 PM CDT | Areal Flood Advisory | OHX | Lawrence, Wayne | 3 hr |
| Jul 17, 9:03 PM CDT | Flash Flood Warning | OHX | Lawrence | 117 min |
| Jul 17, 9:07 PM CDT | Areal Flood Advisory | OHX | Montgomery, Robertson, Sumner | 113 min |
| Jul 17, 10:09 PM CDT | Areal Flood Advisory | OHX | Davidson, Sumner, Trousdale, Wilson | 2 hr |
| Jul 18, 3:54 PM CDT | Special Weather Statement | OHX | Davidson | 51 min |
| Jul 18, 4:03 PM CDT | Areal Flood Advisory | OHX | Davidson, Williamson | 117 min |
| Jul 18, 4:27 PM CDT | Areal Flood Advisory | OHX | Davidson, Rutherford, Williamson, Wilson | 2 hr |
| Jul 18, 4:31 PM CDT | Flash Flood Warning | OHX | Davidson | 89 min |
| Jul 18, 4:42 PM CDT | Areal Flood Advisory | OHX | Cumberland | 3 hr |
| Jul 18, 6:08 PM CDT | Areal Flood Advisory | OHX | Giles | 112 min |
| Jul 18, 6:11 PM CDT | Areal Flood Advisory | OHX | DeKalb | 2 hr |
| Jul 18, 6:14 PM CDT | Areal Flood Advisory | OHX | Sumner, Wilson | 2 hr |
| Jul 18, 6:17 PM CDT | Areal Flood Advisory | OHX | Perry | 118 min |
Nearby
Areal Flood Advisories in Tennessee, 2021Every areal flood advisory 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.