Alert archive / Tennessee / Areal Flood Advisories in 2021

Areal Flood Advisory 166, NWS Nashville, TN

October 3, 2021Davidson County, Tennessee

NWS Nashville, TN issued this areal flood advisory at Oct 3, 2021, 1:52 PM CDT for Davidson County, Tennessee. It was in force for 113 min.

The area

The counties it named.

The facts

Issued: Oct 3, 2021, 1:52 PM CDT (18:52 UTC)
Expired: Oct 3, 2021, 3:45 PM CDT
In force: 113 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

County Davidson County, TN

The radar

The Nashville radar (KOHX), 21 km from the middle of the area, began a volume at 18:51 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, 6.9 hours before the alert went out and 17 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 528 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 624 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 154 m²/s²
0-3 km storm-relative helicity: 132 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

Open this sounding in Storm Lab

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 Oct 3, 12:32 PM CDT, 1 hour 20 minutes earlier.

Area forecast discussion, Oct 3, 12:32 PM CDT, 1 hour 20 minutes before

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Hazardous weather outlook, Oct 3, 5:02 AM CDT, 8 hours 50 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
502 AM CDT Sun Oct 3 2021

TNZ005>011-023>034-056>066-075-077>080-093>095-041015-
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-
502 AM CDT Sun Oct 3 2021

This Hazardous Weather Outlook is for Middle Tennessee.

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

10

In the hours before

Special weather statement, Oct 3, 8:29 AM CDT, 5 hours 23 minutes before

Special Weather Statement
National Weather Service Nashville TN
829 AM CDT Sun Oct 3 2021

TNZ007-025>027-031400-
Robertson TN-Dickson TN-Davidson TN-Cheatham TN-
829 AM CDT Sun Oct 3 2021

...A strong thunderstorm will impact portions of northwestern
Davidson, northeastern Dickson, Cheatham and southwestern Robertson
Counties through 900 AM CDT...

At 829 AM CDT, Doppler radar was tracking a strong thunderstorm near
Ashland City, moving northeast at 35 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Springfield, Ashland City, Greenbrier, Coopertown, Joelton, Pleasant
View, Cheatham Dam, Beaman Park and Whites Creek.

This includes Interstate 24 between mile markers 19 and 41.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3627 8677 3612 8727 3636 8727 3639 8723
      3641 8720 3641 8718 3643 8717 3642 8716
      3642 8715 3643 8715 3659 8686
TIME...MOT...LOC 1329Z 236DEG 32KT 3627 8715

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

Barnwell

The office that day

Everything else NWS Nashville, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 3, 8:29 AM CDT	Special Weather Statement	OHX	Cheatham, Robertson	31 min
Oct 3, 8:41 AM CDT	Areal Flood Advisory	OHX	Cheatham, Dickson, Hickman, Houston, Humphreys, Montgomery and 1 more	2 hr
Oct 3, 1:05 PM CDT	Areal Flood Advisory	OHX	Putnam	3 hr

Nearby

Areal Flood Advisories in Tennessee, 2021 Every 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.