Alert archive / Tennessee / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 56, NWS Morristown, TN

May 21, 2014Carter County, Johnson County, Sullivan County, Tennessee; Washington County, Virginia

NWS Morristown, TN issued this severe thunderstorm warning at May 21, 2014, 11:52 PM EDT for Carter County, Johnson County, Sullivan County, Tennessee; Washington County, Virginia. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 21, 2014, 11:52 PM EDT (03:52 UTC)
Expired: May 22, 2014, 12:30 AM EDT
In force: 38 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Carter County, TN, Johnson County, TN, Sullivan County, TN, Washington County, VA

The radar

The Knoxville radar (KMRX), 126 km from the middle of the area, began a volume at 03:55 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 3.9 hours before the alert went out and 199 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: 241 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 1818 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 190 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at May 21, 10:19 PM EDT, 1 hour 33 minutes earlier.

Area forecast discussion, May 21, 10:19 PM EDT, 1 hour 33 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
1019 PM EDT WED MAY 21 2014

.DISCUSSION...COMPLEX OVER KY HAS DEVELOPED A CONVECTIVELY INDUCED
VORT WHICH WILL INCREASE THE LIKELIHOOD OF STORMS REACHING
NORTHERN AREAS. INCREASED POPS THROUGH MIDNIGHT FOR STORMS WHICH
MAY REACH SEVERE LEVELS ...MAINLY FOR STRONG WIND GUSTS.

&&

.PRELIMINARY POINT TEMPS/POPS...
CHATTANOOGA AIRPORT, TN             62  88  66  87 /  10  20  20  30
KNOXVILLE MCGHEE TYSON AIRPORT, TN  63  85  62  83 /  20  50  20  20
OAK RIDGE, TN                       63  85  62  82 /  20  50  20  20
TRI CITIES AIRPORT, TN              63  81  56  78 /  90  40  20  20

&&

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

SON

Hazardous weather outlook, May 21, 3:41 AM EDT, 20 hours 11 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
341 AM EDT WED MAY 21 2014

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-221200-
CHEROKEE-CLAY-SCOTT TN-CAMPBELL-CLAIBORNE-HANCOCK-HAWKINS-
SULLIVAN-JOHNSON-MORGAN-ANDERSON-UNION-GRAINGER-HAMBLEN-
NORTHWEST COCKE-COCKE SMOKY MOUNTAINS-NORTHWEST GREENE-
SOUTHEAST GREENE-WASHINGTON TN-UNICOI-NORTHWEST CARTER-
SOUTHEAST CARTER-ROANE-LOUDON-KNOX-JEFFERSON-NW 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-SCOTT-RUSSELL-WASHINGTON-
341 AM EDT WED MAY 21 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST TENNESSEE...SOUTHWEST
VIRGINIA...AND EXTREME SOUTHWEST NORTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT...

A COLD FRONT WILL SLOWLY MOVE SOUTH ACROSS THE OHIO VALLEY TODAY...
PRODUCING SCATTERED TO NUMEROUS THUNDERSTORMS. THESE STORMS WILL
MOVE SOUTHEAST INTO SOUTHWEST VIRGINIA AND NORTHEAST TENNESSEE
TONIGHT. SOME OF THESE THUNDERSTORMS MAY BECOME SEVERE...WITH THE
MAIN THREATS BEING LARGE HAIL UP TO QUARTER SIZE AND DAMAGING
WINDS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

STRONG TO SEVERE THUNDERSTORMS WILL AGAIN BE POSSIBLE ON THURSDAY
OVER MOST OF THE AREA...AS THE COLD FRONT SLOWLY DRIFTS INTO THE
SOUTHERN APPALACHIAN REGION. THIS COLD FRONT WILL LIKELY STILL BE
LOCATED AROUND THE SOUTHEAST TENNESSEE VICINITY ON FRIDAY...WITH
SOME STORMS POSSIBLY BECOMING STRONG TO SEVERE AGAIN ON FRIDAY
AFTERNOON AND EVENING...MAINLY ACROSS SOUTHEAST TENNESSEE AND
EXTREME SOUTHWEST NORTH CAROLINA. THE MAIN THREATS WITH THESE
STORMS ON BOTH THURSDAY AND FRIDAY...WILL BE THE POSSIBILITY OF
LARGE HAIL...DAMAGING WINDS...AND LOCALLY HEAVY RAINFALL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE POSSIBLE THIS EVENING...AND AGAIN ON
THURSDAY AND FRIDAY AFTERNOONS AND EVENINGS.

DH/DMG

In the hours before

Special weather statement, May 21, 10:27 PM EDT, 1 hour 25 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1027 PM EDT WED MAY 21 2014

TNZ012>014-VAZ001-002-220315-
CAMPBELL TN-CLAIBORNE TN-SCOTT TN-WISE VA-LEE VA-
1027 PM EDT WED MAY 21 2014

...SIGNIFICANT WEATHER ADVISORY FOR CLAIBORNE...NORTHEASTERN SCOTT...
NORTHWESTERN HANCOCK...NORTHEASTERN ANDERSON...NORTHERN UNION...
NORTHERN GRAINGER...CAMPBELL...WESTERN WISE...WESTERN SCOTT AND LEE
COUNTIES UNTIL 1115 PM EDT...

AT 1026 PM EDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR KRYPTON TO EROSE TO
NEAR DUCKRUN...AND MOVING SOUTHEAST AT 50 MPH.

WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
LA FOLLETTE...JONESVILLE...BIG STONE GAP...NEW TAZEWELL...TAZEWELL...
JACKSBORO...PENNINGTON GAP...HARROGATE...CLOVER FORK...JELLICO...
CARYVILLE...APPALACHIA...POUND...ST. CHARLES...DRYDEN...HOWARD
QUARTER...ELK VALLEY...WHITE OAK...EWING AND LONE MOUNTAIN.

THESE STORMS MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 3720 8255 3674 8282 3659 8299 3660 8347
      3653 8340 3653 8339 3643 8337 3637 8345
      3633 8366 3644 8386 3640 8395 3627 8401
      3624 8415 3659 8436 3658 8369 3674 8313
      3684 8308 3689 8288 3704 8272 3712 8272
TIME...MOT...LOC 0226Z 329DEG 54KT 3730 8327 3694 8363 3677 8437

17

Special weather statement, May 21, 11:20 PM EDT, 32 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1120 PM EDT WED MAY 21 2014

TNZ012-013-035>038-069-070-220400-
CAMPBELL TN-KNOX TN-JEFFERSON TN-MORGAN TN-GRAINGER TN-ANDERSON TN-
SCOTT TN-UNION TN-
1120 PM EDT WED MAY 21 2014

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN JEFFERSON...CENTRAL
SCOTT...NORTHEASTERN ANDERSON...NORTHWESTERN MORGAN...NORTHEASTERN
KNOX...UNION...SOUTHWESTERN GRAINGER AND SOUTHERN CAMPBELL COUNTIES
UNTIL 1200 AM EDT...

AT 1119 PM EDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 8 MILES EAST OF HUNTSVILLE
TO 7 MILES SOUTHWEST OF RUTLEDGE...AND MOVING SOUTHEAST AT 55 MPH.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
CLINTON...JEFFERSON CITY...LA FOLLETTE...ONEIDA...MAYNARDVILLE...
PLAINVIEW...JACKSBORO...NEW MARKET...HUNTSVILLE...HELENWOOD...
STRAWBERRY PLAINS...CARYVILLE...BLAINE...LAKE CITY...NORRIS...
LUTTRELL...ANDERSONVILLE...ELGIN...RUGBY S.P. AND BUFFALO SPRINGS.

LAT...LON 3624 8345 3602 8357 3633 8474 3635 8474
      3635 8473 3637 8473 3637 8470 3640 8466
      3643 8468 3652 8448
TIME...MOT...LOC 0319Z 314DEG 47KT 3644 8433 3622 8364

17

Local storm report, May 21, 11:39 PM EDT, 13 minutes before

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Local storm report, May 21, 11:43 PM EDT, 9 minutes before

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    <section class="card" role="status" aria-live="polite">
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      <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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        Please try again in a few minutes.
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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 21, 10:27 PM EDT	Special Weather Statement	MRX	Campbell, Claiborne	48 min
May 21, 10:38 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Grainger, Hancock, Hawkins, Union	52 min
May 21, 11:20 PM EDT	Special Weather Statement	MRX	Campbell, Scott, Union	40 min
May 21, 11:21 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hamblen, Hawkins, Sullivan, Washington	39 min
May 22, 12:02 AM EDT	Severe Thunderstorm Warning	MRX	Unicoi	28 min
May 22, 5:55 PM EDT	Special Weather Statement	MRX	Scott	35 min
May 22, 6:03 PM EDT	Special Weather Statement	MRX	Claiborne	27 min
May 22, 6:22 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Hamblen, Hancock, Hawkins	23 min
May 22, 6:36 PM EDT	Special Weather Statement	MRX	Anderson, Scott	39 min
May 22, 6:57 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Morgan, Roane, Scott	33 min
May 22, 6:59 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Grainger, Hamblen, Jefferson	46 min
May 22, 7:02 PM EDT	Special Weather Statement	MRX	Greene	43 min
May 22, 7:27 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Knox	48 min
May 22, 7:31 PM EDT	Special Weather Statement	MRX	Sevier	44 min
May 22, 7:34 PM EDT	Special Weather Statement	MRX	Roane	26 min
May 22, 7:39 PM EDT	Severe Thunderstorm Warning	MRX	Loudon, McMinn, Meigs, Monroe, Rhea, Roane	36 min
May 22, 7:45 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Jefferson, Sevier	45 min
May 22, 7:55 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Knox, Loudon, Monroe, Roane	35 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2014 Severe Thunderstorm Warnings in Virginia, 2014 Every severe thunderstorm warning in 2014

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.