Alert archive / Tennessee / Areal Flood Advisories in 2021

Areal Flood Advisory 82, NWS Nashville, TN

August 15, 2021Wayne County, Tennessee

NWS Nashville, TN issued this areal flood advisory at Aug 15, 2021, 11:56 AM CDT for Wayne County, Tennessee. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued: Aug 15, 2021, 11:56 AM CDT (16:56 UTC)
Expired: Aug 15, 2021, 2:00 PM CDT
In force: 2 hr
Issued by: NWS Nashville, TN
Area: Storm-based polygon

County Wayne County, TN

The radar

The Columbus AFB radar (KGWX), 157 km from the middle of the area, began a volume at 16:57 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, 4.9 hours before the alert went out and 146 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: 152 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 697 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 36 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 15, 10:48 AM CDT, 1 hour 8 minutes earlier.

Area forecast discussion, Aug 15, 10:48 AM CDT, 1 hour 8 minutes before

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Hazardous weather outlook, Aug 15, 5:00 AM CDT, 6 hours 56 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
500 AM CDT Sun Aug 15 2021

TNZ005>011-023>034-056>066-075-077>080-093>095-161000-
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-
500 AM CDT Sun Aug 15 2021

This Hazardous Weather Outlook is for Middle Tennessee.

.DAY ONE...Today and tonight.

Scattered thunderstorms are expected today across the Mid State.
Some of these storms may produce strong wind gusts and heavy
rainfall.

.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.

15

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 8:22 PM CDT	Areal Flood Advisory	OHX	Hickman, Lewis, Perry	113 min
Aug 15, 12:45 PM CDT	Areal Flood Advisory	OHX	Bedford, Marshall	2 hr
Aug 15, 1:01 PM CDT	Special Weather Statement	OHX	Rutherford	44 min
Aug 15, 1:12 PM CDT	Special Weather Statement	OHX	Wilson	48 min
Aug 15, 2:17 PM CDT	Special Weather Statement	OHX	Wilson	43 min
Aug 15, 2:29 PM CDT	Special Weather Statement	OHX	Cannon, DeKalb, Warren	46 min
Aug 15, 2:30 PM CDT	Areal Flood Advisory	OHX	Cannon, DeKalb, Warren	2 hr
Aug 15, 2:59 PM CDT	Areal Flood Advisory	OHX	Giles, Marshall, Maury	2 hr
Aug 15, 3:20 PM CDT	Areal Flood Advisory	OHX	Jackson, Putnam	3 hr
Aug 15, 3:34 PM CDT	Areal Flood Advisory	OHX	Fentress, Overton, Pickett	116 min
Aug 15, 4:16 PM CDT	Areal Flood Advisory	OHX	Grundy, Van Buren, Warren	119 min

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.