Alert archive / Tennessee / Areal Flood Advisories in 2021

Areal Flood Advisory 111, NWS Nashville, TN

August 28, 2021Fentress County, Overton County, Pickett County, Tennessee

NWS Nashville, TN issued this areal flood advisory at Aug 28, 2021, 12:47 PM CDT for Fentress County, Overton County, Pickett County, Tennessee. It was in force for 118 min.

The area

The counties it named.

The facts

Issued
Aug 28, 2021, 12:47 PM CDT (17:47 UTC)
Expired
Aug 28, 2021, 2:45 PM CDT
In force
118 min
Issued by
NWS Nashville, TN
Area
Storm-based polygon

Counties Fentress County, TN, Overton County, TN, Pickett County, TN

The radar

The Nashville radar (KOHX), 133 km from the middle of the area, began a volume at 17:51 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, 5.8 hours before the alert went out and 139 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-pSkew-T log-p diagram, Nashville Metro, TN at 12:00Z on 2021-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1024 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 2021-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1024 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
1035 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
53 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 28, 12:39 PM CDT, 8 minutes earlier.

Area forecast discussion, Aug 28, 12:39 PM CDT, 8 minutes before
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Hazardous weather outlook, Aug 28, 5:00 AM CDT, 7 hours 47 minutes before
Hazardous Weather Outlook
National Weather Service Nashville TN
500 AM CDT Sat Aug 28 2021

TNZ005>011-023>034-056>066-075-077>080-093>095-291000-
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 Sat Aug 28 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...Sunday through Friday.

Hurricane Ida is forecast to make landfall in Louisiana on Sunday
night, then turn northeast and weaken to a Tropical Depression as it
moves near or across Middle Tennessee from Tuesday into Wednesday.
Although the amount of rainfall we receive will be highly dependent
on the track of Ida, current indications are that 2 to 4 inches of
rain, with some locally higher amounts, is possible during this
timeframe. This may lead to localized flooding issues. In addition,
damaging wind gusts and an isolated tornadoes cannot be ruled out as
the remnant low crosses our area.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed next Tuesday & Wednesday depending
on the future track of Hurricane Ida.

Adcock

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 28, 2:26 PM CDTAreal Flood AdvisoryOHXJackson, Putnam2 hr
Aug 28, 3:46 PM CDTAreal Flood AdvisoryOHXSumner, Wilson74 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.