Alert archive / Tennessee / Special Weather Statements in 2021

Special Weather Statement, NWS Morristown, TN

August 31, 2021Sequatchie County, Tennessee

NWS Morristown, TN issued this special weather statement at Aug 31, 2021, 1:08 PM CDT for Sequatchie County, Tennessee. It was in force for 22 min. 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 31, 2021, 1:08 PM CDT (18:08 UTC)
Expired
Aug 31, 2021, 1:30 PM CDT
In force
22 min
Issued by
NWS Morristown, TN
Hail
0.00 in
Wind
40

County Sequatchie County, TN

The radar

The Northeast Alabama radar (KHTX), 86 km from the middle of the area, began a volume at 18:07 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 12:00Z, 6.1 hours before the alert went out and 233 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, Peachtre/Fal Fld, GA at 12:00Z on 2021-08-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 209 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, Peachtre/Fal Fld, GA at 12:00Z on 2021-08-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 283 square meters per square second.193958Sfc1 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
209 J/kg
Mixed-layer CIN
-42 J/kg
Mixed-layer LCL
708 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
283 m²/s²
0-3 km storm-relative helicity
351 m²/s²
Significant tornado parameter
0.1
Supercell composite
2.5

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Morristown, TN wrote its last area forecast discussion before this special weather statement went out at Aug 31, 1:01 PM CDT, 7 minutes earlier.

Area forecast discussion, Aug 31, 1:01 PM CDT, 7 minutes before
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</head>
<body>
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        Please try again in a few minutes.
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Hazardous weather outlook, Aug 30, 2:53 PM CDT, 22 hours 15 minutes before
Hazardous Weather Outlook
National Weather Service Morristown TN
353 PM EDT Mon Aug 30 2021

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-312000-
Cherokee-Clay-Scott-Campbell-Claiborne-Hancock-Hawkins-Sullivan-
Johnson-Morgan-Anderson-Union-Grainger-Hamblen-Northwest Cocke-
Cocke Smoky Mountains-Northwest Greene-Southeast Greene-
Washington-Unicoi-Northwest Carter-Southeast Carter-Roane-Loudon-
Knox-Jefferson-Northwest Blount-Blount Smoky Mountains-
North Sevier-Sevier Smoky Mountains-Sequatchie-Bledsoe-Rhea-Meigs-
McMinn-Northwest Monroe-Southeast Monroe-Marion-Hamilton-Bradley-
West Polk-East Polk-Lee-Wise-Russell-
353 PM EDT Mon Aug 30 2021 /253 PM CDT Mon Aug 30 2021/

This Hazardous Weather Outlook is for portions of southwest North
Carolina...east Tennessee and southwest Virginia.

.DAY ONE...This Afternoon and Tonight

Outer rain bands associated with Ida may make their way into
southern parts of the Tennessee valley late this evening and
overnight. While the threat is low, an isolated tornado could
occur in these bands.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

The remnants of Hurricane Ida will affect the area from late
tonight through Wednesday morning. Heavy rains and even some
isolated tornadoes will be a possibility.

Flooding is a concern as rain bands move through the area. The
primary areas of concern for heavy rains and flooding will be
along the Cumberland Plateau and western portions of southwest
Virginia where 2 to 4 inches of rain are forecast.

The threat for isolated tornadoes will continue on Tuesday as rain
bands from Ida continue to rotate into the forecast area. Primary
concern will be south of roughly Athens, but the threat will
extend into the northern Tennessee valley as well.

.SPOTTER INFORMATION STATEMENT...

Spotter reports are welcome for flooding and tornadoes.

In the hours before

Special weather statement, Aug 31, 1:08 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Morristown TN
108 PM CDT Tue Aug 31 2021

TNZ081-082-311830-
Sequatchie TN-Bledsoe TN-
108 PM CDT Tue Aug 31 2021

...A strong thunderstorm will impact portions of east central
Sequatchie and southwestern Bledsoe Counties through 130 PM CDT...

At 108 PM CDT, Doppler radar was tracking a strong thunderstorm near
Dunlap, moving north at 30 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...
Palio.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3531 8536 3550 8536 3545 8517 3533 8524
      3528 8528
TIME...MOT...LOC 1808Z 199DEG 26KT 3535 8530

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

JLB

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 30, 7:01 PM CDTSpecial Weather StatementMRXAnderson, Campbell, Morgan, Scott59 min
Aug 30, 7:25 PM CDTSpecial Weather StatementMRXGrainger, Jefferson, Knox, Sevier, Union65 min
Aug 30, 7:42 PM CDTAreal Flood AdvisoryMRXAnderson, Blount, Campbell, Cocke, Grainger, Jefferson and 5 more2 hr
Aug 31, 8:39 AM CDTRiver Flood WarningMRXHamilton20 hr
Aug 31, 9:23 AM CDTAreal Flood AdvisoryMRXBradley, Loudon, McMinn, Monroe, Polk3 hr
Aug 31, 11:44 AM CDTAreal Flood AdvisoryMRXMonroe, Polk9 hr
Aug 31, 1:10 PM CDTSpecial Weather StatementMRXBradley20 min
Aug 31, 1:32 PM CDTSpecial Weather StatementMRXBledsoe28 min
Aug 31, 2:07 PM CDTSpecial Weather StatementMRXMeigs23 min
Aug 31, 2:23 PM CDTSpecial Weather StatementMRXRhea37 min
Aug 31, 2:48 PM CDTSpecial Weather StatementMRXRhea27 min
Aug 31, 3:43 PM CDTAreal Flood AdvisoryMRXHamilton, Marion, Sequatchie2 hr
Aug 31, 4:16 PM CDTAreal Flood AdvisoryMRXKnox85 min
Aug 31, 4:24 PM CDTAreal Flood AdvisoryMRXMcMinn, Monroe, Polk5 hr
Aug 31, 5:12 PM CDTAreal Flood AdvisoryMRXBlount, Knox, Loudon, Monroe4 hr
Aug 31, 5:20 PM CDTSpecial Weather StatementMRXCarter, Johnson40 min
Aug 31, 5:41 PM CDTFlash Flood WarningMRXKnox2 hr
Aug 31, 5:53 PM CDTAreal Flood AdvisoryMRXAnderson, Knox5 hr
Aug 31, 6:02 PM CDTAreal Flood AdvisoryMRXLoudon, Monroe, Roane3 hr

Nearby

Special Weather Statements in Tennessee, 2021Every special weather statement 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.