Alert archive / Tennessee / Special Weather Statements in 2021

Special Weather Statement, NWS Morristown, TN

May 3, 2021Hamblen County, Jefferson County, Tennessee

NWS Morristown, TN issued this special weather statement at May 3, 2021, 8:47 PM EDT for Hamblen County, Jefferson 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, 8:47 PM EDT (00:47 UTC)
Expired: May 3, 2021, 9:30 PM EDT
In force: 43 min
Issued by: NWS Morristown, TN

Counties Hamblen County, TN, Jefferson County, TN

The radar

The Knoxville radar (KMRX), 8 km from the middle of the area, began a volume at 00:49 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, 0.8 hours before the alert went out and 294 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: 2263 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1050 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 7.6

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, 7:45 PM EDT, 1 hour 2 minutes earlier.

Area forecast discussion, May 3, 7:45 PM EDT, 1 hour 2 minutes before

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Hazardous weather outlook, May 3, 3:48 PM EDT, 4 hours 59 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
348 PM EDT Mon May 3 2021

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-042000-
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-
348 PM EDT Mon May 3 2021 /248 PM 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 through late evening, 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. In addition, training
of showers and storms are possible along the I-40 corridor
through late evening. If this occurs, localized flash flooding
will be possible.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Strong to severe thunderstorms will be possible Tuesday morning
and again Tuesday evening. Damaging wind, large hail, and an
isolated tornado are the main threats. In addition, multiple
rounds of moderate to heavy rainfall will further increase the
potential for isolated flash flooding through Tuesday.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to relay reports of severe weather and
flooding to our office Monday and Tuesday.

In the hours before

Special weather statement, May 3, 4:04 PM EDT, 4 hours 43 minutes before

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

TNZ069>071-073-032045-
Jefferson TN-Knox TN-North Sevier TN-NW Blount TN-
404 PM EDT Mon May 3 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN KNOX...NORTH CENTRAL
BLOUNT...SOUTHEASTERN JEFFERSON AND CENTRAL SEVIER COUNTIES UNTIL 445
PM EDT...

At 403 PM EDT, Doppler radar was tracking a strong thunderstorm near
Rockford, or near Knoxville, moving east at 35 mph.

Pea size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Knoxville, Sevierville, Alcoa, Dandridge, Pigeon Forge, Rockford,
Bird Crossing, Fairgarden, Kimberlin Heights and McMahan.

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.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3583 8398 3595 8398 3604 8330 3590 8329
      3589 8332 3589 8331 3587 8331 3587 8329
      3581 8329 3578 8338
TIME...MOT...LOC 2003Z 267DEG 30KT 3589 8387

DH

Special weather statement, May 3, 4:19 PM EDT, 4 hours 28 minutes before

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Special weather statement, May 3, 4:34 PM EDT, 4 hours 13 minutes before

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Special weather statement, May 3, 6:43 PM EDT, 2 hours 4 minutes before

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Special weather statement, May 3, 8:29 PM EDT, 18 minutes before

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Special weather statement, May 3, 8:47 PM EDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 8:29 PM EDT	Special Weather Statement	MRX	Greene, Unicoi, Washington	46 min
May 4, 3:10 AM EDT	Severe Thunderstorm Warning	MRX	Morgan, Roane	50 min
May 4, 3:53 AM EDT	Severe Thunderstorm Warning	MRX	Anderson, Morgan, Roane	52 min
May 4, 3:56 AM EDT	Special Weather Statement	MRX	Morgan	49 min
May 4, 4:12 AM EDT	Special Weather Statement	MRX	Morgan	48 min
May 4, 4:40 AM EDT	Severe Thunderstorm Warning	MRX	Anderson, Knox	30 min
May 4, 4:45 AM EDT	Special Weather Statement	MRX	Blount	45 min
May 4, 4:57 AM EDT	Areal Flood Advisory	MRX	Anderson, Morgan, Roane	3 hr
May 4, 5:14 AM EDT	Special Weather Statement	MRX	Knox	46 min
May 4, 5:34 AM EDT	Special Weather Statement	MRX	Blount	41 min
May 4, 6:05 AM EDT	Severe Thunderstorm Warning	MRX	Blount, Sevier	30 min
May 4, 6:11 AM EDT	Areal Flood Advisory	MRX	Anderson, Knox	3 hr
May 4, 6:16 AM EDT	Areal Flood Advisory	MRX	Blount	3 hr
May 4, 6:52 AM EDT	Special Weather Statement	MRX	Sevier	53 min
May 4, 7:00 AM EDT	Flash Flood Warning	MRX	Blount, Sevier	3 hr
May 4, 7:24 AM EDT	Areal Flood Advisory	MRX	Scott	3 hr
May 4, 7:58 AM EDT	Special Weather Statement	MRX	Cocke	47 min
May 4, 9:05 AM EDT	Special Weather Statement	MRX	Morgan, Scott	40 min
May 4, 9:18 AM EDT	Special Weather Statement	MRX	Hamilton	27 min
May 4, 9:37 AM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Morgan, Rhea, Roane	38 min
May 4, 9:48 AM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Rhea	27 min
May 4, 9:50 AM EDT	Special Weather Statement	MRX	Anderson, Campbell, Claiborne, Union	40 min
May 4, 9:53 AM EDT	Special Weather Statement	MRX	Hamilton, Marion, Sequatchie	67 min
May 4, 10:03 AM EDT	Severe Thunderstorm Warning	MRX	Anderson, Blount, Knox, Loudon, Roane	13 min
May 4, 10:18 AM EDT	Special Weather Statement	MRX	McMinn, Meigs	57 min
May 4, 10:24 AM EDT	Special Weather Statement	MRX	Blount, Knox	36 min
May 4, 10:37 AM EDT	Special Weather Statement	MRX	Hamblen	38 min
May 4, 10:41 AM EDT	Severe Thunderstorm Warning	MRX	Blount, Jefferson, Knox, Sevier	34 min
May 4, 10:45 AM EDT	Severe Thunderstorm Warning	MRX	Blount, Monroe	30 min
May 4, 11:10 AM EDT	Severe Thunderstorm Warning	MRX	Cocke, Jefferson, Sevier	22 min
May 4, 11:11 AM EDT	Flash Flood Warning	MRX	Hamilton, Marion, Sequatchie	3 hr
May 4, 11:29 AM EDT	Areal Flood Warning	MRX	Blount, Sevier	6 hr
May 4, 11:44 AM EDT	Areal Flood Advisory	MRX	Blount, Monroe	2 hr
May 4, 11:47 AM EDT	Areal Flood Advisory	MRX	Blount, Sevier	118 min
May 4, 12:06 PM EDT	Special Weather Statement	MRX	Polk	24 min
May 4, 11:52 AM EDT	Special Weather Statement	MRX	Graham	38 min
May 4, 12:01 PM EDT	Flash Flood Warning	MRX	Cherokee, Clay	3 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.