Alert archive / Tennessee / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 114, NWS Morristown, TN

June 21, 2014Marion County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jun 21, 2014, 5:37 PM CDT for Marion County, Tennessee. 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: Jun 21, 2014, 5:37 PM CDT (22:37 UTC)
Expired: Jun 21, 2014, 6:15 PM CDT
In force: 38 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

County Marion County, TN

The radar

The Northeast Alabama radar (KHTX), 47 km from the middle of the area, began a volume at 22:36 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, 10.6 hours before the alert went out and 142 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: 144 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 1330 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jun 21, 2:30 PM CDT, 3 hours 7 minutes earlier.

Area forecast discussion, Jun 21, 2:30 PM CDT, 3 hours 7 minutes before

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Hazardous weather outlook, Jun 21, 2:30 AM CDT, 15 hours 7 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
330 AM EDT SAT JUN 21 2014

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-221100-
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-
330 AM EDT SAT JUN 21 2014

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

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

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER THE
SOUTHERN APPALACHIAN REGION TODAY AND TONIGHT. SOME STORMS COULD
BECOME STRONG TO SEVERE...BRINGING THE POSSIBILITY OF DAMAGING WINDS...
FREQUENT CLOUD TO GROUND LIGHTNING...AND LOCALLY HEAVY RAINFALL.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

WEAK FRONTAL BOUNDARIES WILL LINGER AROUND THE SOUTHERN APPALACHIAN
REGION THROUGHOUT THE WEEK...WITH SCATTERED SHOWERS AND THUNDERSTORMS
DEVELOPING EACH DAY...ESPECIALLY DURING THE AFTERNOON AND EVENING
HOURS. A FEW STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE EACH
DAY...WITH THE POSSIBILITY OF DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING...AND LOCALLY HEAVY RAINFALL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME...DUE TO THE
ISOLATED NATURE OF THE EXPECTED SEVERE ACTIVITY.

DMG

In the hours before

Local storm report, Jun 21, 2:22 PM CDT, 3 hours 15 minutes before

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Local storm report, Jun 21, 3:48 PM CDT, 1 hour 49 minutes before

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Special weather statement, Jun 21, 4:06 PM CDT, 1 hour 31 minutes before

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Special weather statement, Jun 21, 4:27 PM CDT, 1 hour 10 minutes before

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Special weather statement, Jun 21, 5:30 PM CDT, 7 minutes before

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Local storm report, Jun 21, 5:36 PM CDT, 1 minute 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
Jun 21, 10:46 AM CDT	Special Weather Statement	MRX	Morgan	44 min
Jun 21, 11:28 AM CDT	Special Weather Statement	MRX	McMinn, Meigs, Roane	47 min
Jun 21, 12:03 PM CDT	Severe Thunderstorm Warning	MRX	Blount, Knox, Loudon, Monroe, Roane	42 min
Jun 21, 12:23 PM CDT	Special Weather Statement	MRX	Monroe, Polk	52 min
Jun 21, 12:36 PM CDT	Special Weather Statement	MRX	Knox	39 min
Jun 21, 12:44 PM CDT	Special Weather Statement	MRX	Blount, Monroe	61 min
Jun 21, 12:49 PM CDT	Severe Thunderstorm Warning	MRX	Blount, Monroe	41 min
Jun 21, 4:06 PM CDT	Special Weather Statement	MRX	Bledsoe, Meigs, Rhea	39 min
Jun 21, 4:27 PM CDT	Special Weather Statement	MRX	Hamilton	33 min
Jun 21, 5:30 PM CDT	Special Weather Statement	MRX	Marion	45 min
Jun 21, 1:13 PM CDT	Special Weather Statement	MRX	Cherokee, Clay	77 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 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.