Alert archive / Tennessee / Special Weather Statements in 2021

Special Weather Statement, NWS Morristown, TN

August 1, 2021Loudon County, Monroe County, Tennessee

NWS Morristown, TN issued this special weather statement at Aug 1, 2021, 1:40 AM EDT for Loudon County, Monroe County, Tennessee. It was in force for 50 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 1, 2021, 1:40 AM EDT (05:40 UTC)
Expired: Aug 1, 2021, 2:30 AM EDT
In force: 50 min
Issued by: NWS Morristown, TN

Counties Loudon County, TN, Monroe County, TN

The radar

The Knoxville radar (KMRX), 112 km from the middle of the area, began a volume at 05:40 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 00:00Z, 5.7 hours before the alert went out and 206 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: 1106 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1447 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 251 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 5.3

Open this sounding in Storm Lab

The text

As transmitted.

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <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>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

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 1, 1:19 AM EDT, 21 minutes earlier.

Area forecast discussion, Aug 1, 1:19 AM EDT, 21 minutes before

AREA FORECAST DISCUSSION
National Weather Service Morristown TN
119 AM EDT Sun Aug 1 2021

.UPDATE...
FOR 06Z AVIATION.

&&

.DISCUSSION...

The main change for the update will be to increase PoPs for
central areas overnight.

A cluster of thunderstorms has developed quickly over northern
Middle TN, tracking E-SE. Projecting its speed forward, it should
arrive at our Plateau counties around midnight. Although it will
be encountering a less favorable environment with lower MUCAPE, the
HRRR shows that should hold together enough to warrant high
chance to likely PoPs in the 05-11Z time frame. A threat of gusty
winds and hail cannot be ruled out due to decent 0-6 km shear,
but with low CAPE that threat appears marginal at best.

DGS

&&

.AVIATION...
06Z TAF DISCUSSION.

Remnants of an MCS moving through eastern TN for the first portion
of these TAFs. This could cause severe thunderstorms around KCHA
between 05z-08z. Expect weaker showers and thunderstorms to impact
KTYS overnight, and possibly a few isolated showers near KTRI.
This rain could create fog later in the night, but will have to
wait and see how much and where the rain falls. Expect conditions
to slowly improve tomorrow and eventually reach VFR.

ABM

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             89  68  86  66  87 /  50  20  20  10  20
Knoxville McGhee Tyson Airport, TN  84  66  86  64  87 /  40  10  10  10  30
Oak Ridge, TN                       84  65  84  63  86 /  40  10  10  10  30
Tri Cities Airport, TN              82  61  83  62  81 /  40  10  10  20  50

&&

.MRX WATCHES/WARNINGS/ADVISORIES...
NC...NONE.
TN...NONE.
VA...NONE.
&&

Hazardous weather outlook, Aug 1, 12:38 AM EDT, 1 hour 2 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
1238 AM EDT Sun Aug 1 2021

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-010915-
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-
1238 AM EDT Sun Aug 1 2021 /1138 PM CDT Sat Jul 31 2021/

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

.DAY ONE...Tonight

Strong to severe storms will be possible in southeast Tennessee
late Saturday night into very early Sunday morning. Strong
straight line winds will be the main hazard with these storms.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not needed at this time.

In the hours before

Special weather statement, Aug 1, 1:30 AM EDT, 10 minutes before

Special Weather Statement
National Weather Service Morristown TN
130 AM EDT Sun Aug 1 2021

TNZ082>084-010600-
Rhea TN-Bledsoe TN-Meigs TN-
130 AM EDT Sun Aug 1 2021

...SIGNIFICANT WEATHER ADVISORY FOR RHEA...CENTRAL BLEDSOE AND MEIGS
COUNTIES UNTIL 200 AM EDT/100 AM CDT/...

At 129 AM EDT/1229 AM CDT/, Doppler radar was tracking a strong
thunderstorm near Dayton, moving east at 35 mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Dayton, Decatur, Graysville, Evensville, Peakland, Old Washington,
Ten Mile and Big Spring.

A Severe Thunderstorm Watch remains in effect until 400 AM EDT/300 AM
CDT/ for east Tennessee.

LAT...LON 3547 8516 3566 8514 3567 8463 3549 8476
      3545 8481 3535 8486
TIME...MOT...LOC 0529Z 274DEG 29KT 3557 8506

Special weather statement, Aug 1, 1:40 AM EDT, 0 minutes before

Special Weather Statement
National Weather Service Morristown TN
140 AM EDT Sun Aug 1 2021

TNZ067-068-071-084>086-010630-
Northwest Monroe TN-Roane TN-Loudon TN-NW Blount TN-Meigs TN-
McMinn TN-
140 AM EDT Sun Aug 1 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN LOUDON...NORTHEASTERN
MEIGS...NORTHEASTERN MCMINN...SOUTHWESTERN BLOUNT...NORTHWESTERN
MONROE AND SOUTHWESTERN ROANE COUNTIES UNTIL 230 AM EDT...

At 139 AM EDT, Doppler radar was tracking a strong thunderstorm 7
miles south of Fairview, or 9 miles northwest of Sweetwater, moving
east at 40 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Sweetwater, Loudon, Madisonville, Vonore, Greenback, Niota,
Philadelphia, Paint Rock, Fort Loudon State Park and Tariffville.

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.

&&

A Severe Thunderstorm Watch remains in effect until 400 AM EDT for
portions of southeast Tennessee.

LAT...LON 3561 8474 3579 8467 3569 8398 3544 8414
      3537 8422
TIME...MOT...LOC 0539Z 288DEG 34KT 3568 8462

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 1:10 AM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Marion, Sequatchie	65 min
Aug 1, 1:30 AM EDT	Special Weather Statement	MRX	Meigs, Rhea	30 min
Aug 1, 2:06 AM EDT	Special Weather Statement	MRX	Bradley, Hamilton, Meigs, Rhea	39 min
Aug 1, 2:10 AM EDT	Severe Thunderstorm Warning	MRX	Blount, Loudon, Monroe	65 min
Aug 1, 4:44 AM EDT	Special Weather Statement	MRX	Johnson	31 min
Aug 1, 3:24 AM EDT	Special Weather Statement	MRX	Cherokee, Clay	66 min

Nearby

Special Weather Statements in Tennessee, 2021 Every 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.