Alert archive / Tennessee / Special Weather Statements in 2021

Special Weather Statement, NWS Morristown, TN

February 28, 20214 counties in Tennessee

NWS Morristown, TN issued this special weather statement at Feb 28, 2021, 10:44 PM CST for 4 counties in Tennessee. It was in force for 61 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: Feb 28, 2021, 10:44 PM CST (04:44 UTC)
Expired: Feb 28, 2021, 11:45 PM CST
In force: 61 min
Issued by: NWS Morristown, TN

Counties Bledsoe County, TN, Hamilton County, TN, Marion County, TN, Sequatchie County, TN

The radar

The Northeast Alabama radar (KHTX), 72 km from the middle of the area, began a volume at 04:43 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, 4.7 hours before the alert went out and 135 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: 419 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 979 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 220 m²/s²
0-3 km storm-relative helicity: 278 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.5

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 Feb 28, 8:03 PM CST, 2 hours 41 minutes earlier.

Area forecast discussion, Feb 28, 8:03 PM CST, 2 hours 41 minutes before

<!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>

Hazardous weather outlook, Feb 28, 2:06 PM CST, 8 hours 38 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
306 PM EST Sun Feb 28 2021

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-012015-
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-
306 PM EST Sun Feb 28 2021 /206 PM CST Sun Feb 28 2021/

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

.DAY ONE...This Afternoon and Tonight

...Flood Watch for portions of East Tennessee and Southwest
Virginia from this evening until early Monday Afternoon...

Periods of heavy rain will move into the region tonight and
continue through Monday morning. Due to the recent rains, the
ground is already saturated over most of the area. The heavy rains
and saturated ground may produce some localized flooding,
especially across the watch area. Please refer to the Flood Watch
product for additional details.

As a line of thunderstorms moves across the area tonight, locally
damaging winds will be possible, and a very low risk of a tornado
will exist, across the Cumberland Plateau and areas generally
west of Interstate 75.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

Moderate to Heavy rain will taper off Monday morning, but
localized flooding will remain possible due to runoff even after
rainfall has ended.

.SPOTTER INFORMATION STATEMENT...

Spotter reports of flooding and wind damage may be needed tonight
through early Monday afternoon.

In the hours before

Special weather statement, Feb 28, 8:51 PM CST, 1 hour 53 minutes before

Special Weather Statement
National Weather Service Morristown TN
951 PM EST Sun Feb 28 2021

TNZ012-013-035-036-010345-
Anderson TN-Scott TN-Campbell TN-Morgan TN-
951 PM EST Sun Feb 28 2021

...SIGNIFICANT WEATHER ADVISORY FOR MORGAN...NORTHWESTERN ANDERSON...
CAMPBELL AND SCOTT COUNTIES UNTIL 1045 PM EST...

At 950 PM EST, Doppler radar was tracking strong thunderstorms along
a line extending from near Great Meadows Campsites to 6 miles
southwest of Monterey. Movement was east at 40 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
La Follette, Oneida, Wartburg, Jacksboro, Huntsville, Helenwood,
Harriman, Jellico, Caryville and Winfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3659 8399 3659 8398 3653 8397 3598 8450
      3593 8463 3594 8470 3609 8480 3609 8483
      3616 8491 3621 8491 3624 8488 3628 8488
      3630 8480 3637 8472 3640 8466 3660 8478
TIME...MOT...LOC 0250Z 279DEG 33KT 3662 8476 3608 8535

TD

Special weather statement, Feb 28, 10:08 PM CST, 36 minutes before

Special Weather Statement
National Weather Service Morristown TN
1108 PM EST Sun Feb 28 2021

TNZ014>016-VAZ001-002-005-010500-
Claiborne TN-Hancock TN-Hawkins TN-Scott VA-Wise VA-Lee VA-
1108 PM EST Sun Feb 28 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN HAWKINS...
CLAIBORNE...HANCOCK...LEE...WESTERN SCOTT AND WESTERN WISE COUNTIES
AND THE WESTERN CITY OF NORTON UNTIL MIDNIGHT EST...

At 1107 PM EST, Doppler radar was tracking strong thunderstorms along
a line extending from Hosea to 7 miles southeast of Pruden. Movement
was east at 35 mph.

Winds of 30 to around 40 mph will be possible with these storms.

Locations impacted include...
Rogersville, Norton, Wise, Sneedville, Jonesville, Big Stone Gap, New
Tazewell, Tazewell, Pennington Gap and Clover Fork.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3709 8252 3634 8302 3637 8328 3640 8328
      3642 8335 3642 8343 3639 8345 3644 8392
      3658 8383 3658 8369 3667 8352 3667 8342
      3674 8314 3685 8307 3685 8301 3690 8287
      3698 8287 3705 8272 3712 8272
TIME...MOT...LOC 0407Z 284DEG 31KT 3714 8344 3650 8384

TD

Special weather statement, Feb 28, 10:44 PM CST, 0 minutes before

Special Weather Statement
National Weather Service Morristown TN
1144 PM EST Sun Feb 28 2021

TNZ081>084-098-099-010545-
Sequatchie TN-Rhea TN-Bledsoe TN-Marion TN-Hamilton TN-Meigs TN-
1144 PM EST Sun Feb 28 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN
RHEA...SEQUATCHIE... SOUTHWESTERN BLEDSOE...SOUTHWESTERN
MEIGS...MARION AND WESTERN HAMILTON COUNTIES UNTIL 1245 AM EST/1145
PM CST/...

At 1141 PM EST/1041 PM CST/, Doppler radar was tracking showers and
isolated thunderstorms along a line extending from near Spencer to
12 miles east of Manchester to Tims Ford Lake. Movement was
southeast at 30 mph.

Winds in excess of 30 mph will be possible with these showers
and thunderstorms.

Locations impacted include...
Chattanooga, Dayton, Dunlap, Jasper, Pikeville, Soddy-Daisy, Signal
Mountain, South Pittsburg, Walden and Lakesite.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Locally heavy rainfall is also occurring with these showers and
storms, and may lead to localized flooding. Do not drive your
vehicle through flooded roadways.

&&

LAT...LON 3524 8582 3522 8574 3524 8569 3529 8571
      3532 8557 3535 8551 3541 8549 3541 8551
      3543 8554 3549 8554 3553 8560 3555 8546
      3567 8531 3544 8481 3535 8486 3536 8488
      3534 8488 3498 8548 3499 8586 3522 8587
TIME...MOT...LOC 0441Z 305DEG 27KT 3567 8547 3543 8587 3522 8621

TD

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 8:51 PM CST	Special Weather Statement	MRX	Campbell, Morgan, Scott	54 min
Feb 28, 10:08 PM CST	Special Weather Statement	MRX	Claiborne, Hancock	52 min
Mar 1, 12:03 AM CST	Areal Flood Advisory	MRX	Campbell, Claiborne, Morgan, Scott	3 hr
Mar 1, 12:13 AM CST	Special Weather Statement	MRX	Bradley, Hamilton, McMinn, Meigs, Monroe, Polk	62 min
Mar 1, 1:11 AM CST	Special Weather Statement	MRX	Blount, Cocke, Sevier	49 min
Mar 1, 3:14 AM CST	Areal Flood Advisory	MRX	Campbell, Claiborne, Morgan, Scott	3 hr
Mar 1, 4:42 AM CST	Areal Flood Warning	MRX	Campbell, Claiborne, Morgan, Scott	3 hr
Mar 1, 9:56 AM CST	River Flood Warning	MRX	Hancock	34 hr
Mar 1, 9:56 AM CST	River Flood Warning	MRX	Claiborne, Grainger, Hancock	47 hr
Feb 28, 11:14 PM CST	Areal Flood Advisory	MRX	Wise, City of Norton	3 hr
Mar 1, 1:39 AM CST	Areal Flood Warning	MRX	Lee, Scott, Wise, City of Norton	3 hr
Mar 1, 4:39 AM CST	Areal Flood Warning	MRX	Lee, Russell, Scott, Wise, City of Norton	3 hr
Mar 1, 9:56 AM CST	River Flood Warning	MRX	Russell, Scott, Wise	25 hr

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.