Alert archive / Tennessee / Special Weather Statements in 2021

Special Weather Statement, NWS Morristown, TN

May 3, 2021Knox County, Tennessee

NWS Morristown, TN issued this special weather statement at May 3, 2021, 1:02 PM EDT for Knox County, Tennessee. It was in force for 43 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: May 3, 2021, 1:02 PM EDT (17:02 UTC)
Expired: May 3, 2021, 1:45 PM EDT
In force: 43 min
Issued by: NWS Morristown, TN

County Knox County, TN

The radar

The Knoxville radar (KMRX), 67 km from the middle of the area, began a volume at 17:03 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, 5.0 hours before the alert went out and 229 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: 85 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 658 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 381 m²/s²
0-3 km storm-relative helicity: 473 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 May 3, 10:22 AM EDT, 2 hours 40 minutes earlier.

Area forecast discussion, May 3, 10:22 AM EDT, 2 hours 40 minutes before

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</head>
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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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Hazardous weather outlook, May 3, 11:23 AM EDT, 1 hour 39 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
1123 AM EDT Mon May 3 2021

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-041530-
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-
1123 AM EDT Mon May 3 2021 /1023 AM CDT Mon May 3 2021/

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

.DAY ONE...This Afternoon and Tonight

A few isolated to scattered thunderstorms will be possible this
afternoon, and they may have the potential to produce large hail
and strong wind gusts. Although chances are low, an isolated
tornado can't be ruled out.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Strong storms will be possible again on Tuesday ahead of a cold front.
Damaging wind, large hail, and an isolated tornado are all
possible. In addition to the threat of strong storms, a few rounds
of heavy rain early this week could make rain accumulate enough
to cause flooding, especially Tuesday. The Smoky Mountains,
southeast Tennessee and southwest North Carolina will have the
highest rainfall totals and therefore the highest risk for
flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed Tuesday for storm reports.

In the hours before

Special weather statement, May 3, 1:02 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service Morristown TN
102 PM EDT Mon May 3 2021

TNZ036-067>069-031745-
Anderson TN-Roane TN-Loudon TN-Knox TN-
102 PM EDT Mon May 3 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN LOUDON...KNOX...
SOUTH CENTRAL ANDERSON AND NORTHEASTERN ROANE COUNTIES UNTIL 145 PM
EDT...

At 102 PM EDT, Doppler radar was tracking a strong thunderstorm over
Oak Ridge, moving east at 50 mph.

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

Locations impacted include...
Knoxville, Oak Ridge, Clinton, Lenoir City, Alcoa, Farragut, Oliver
Springs, Louisville, Halls and Bradbury.

LAT...LON 3584 8441 3599 8444 3602 8439 3613 8382
      3590 8378 3586 8383 3586 8391 3588 8395
      3586 8398 3588 8400 3588 8401 3587 8403
      3587 8401 3585 8401
TIME...MOT...LOC 1702Z 262DEG 43KT 3594 8433

SR

The office that day

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

Issued	Product	Office	Counties	Lasted
May 2, 9:04 PM EDT	Wind Advisory	MRX	Blount, Cocke, Greene, Monroe, Sevier	13 hr
May 3, 1:37 PM EDT	Special Weather Statement	MRX	Grainger, Hamblen, Jefferson, Knox	38 min
May 3, 2:10 PM EDT	Special Weather Statement	MRX	Greene, Washington	65 min
May 3, 2:15 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene	37 min
May 3, 4:04 PM EDT	Special Weather Statement	MRX	Sevier	41 min
May 3, 4:19 PM EDT	Special Weather Statement	MRX	Blount, Sevier	41 min
May 3, 4:34 PM EDT	Special Weather Statement	MRX	Cocke	41 min
May 3, 6:43 PM EDT	Special Weather Statement	MRX	Knox	47 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.