Alert archive / Tennessee / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 34, NWS Morristown, TN

May 15, 2010Claiborne County, Hancock County, Hawkins County, Tennessee; Lee County, Virginia

NWS Morristown, TN issued this severe thunderstorm warning at May 15, 2010, 7:58 PM EDT for Claiborne County, Hancock County, Hawkins County, Tennessee; Lee County, Virginia. It was in force for 51 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 15, 2010, 7:58 PM EDT (23:58 UTC)
Expired: May 15, 2010, 8:49 PM EDT
In force: 51 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Claiborne County, TN, Hancock County, TN, Hawkins County, TN, Lee County, VA

The radar

The Knoxville radar (KMRX), 44 km from the middle of the area, began a volume at 00:04 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, 12.0 hours before the alert went out and 304 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: 543 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 493 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 42 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 15, 7:55 PM EDT, 3 minutes earlier.

Area forecast discussion, May 15, 7:55 PM EDT, 3 minutes before

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Hazardous weather outlook, May 15, 3:49 AM EDT, 16 hours 9 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
349 AM EDT SAT MAY 15 2010

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-160900-
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-
349 AM EDT SAT MAY 15 2010 /249 AM CDT SAT MAY 15 2010/

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

.DAY ONE...TODAY AND TONIGHT

A WEAK COLD FRONTAL BOUNDARY WILL REMAIN OVER THE REGION TODAY.
SCATTERED SHOWERS AND THUNDERSTORMS CAN BE EXPECTED...AND A FEW OF
THESE THUNDERSTORMS MAY BECOME SEVERE THIS AFTERNOON WITH DAMAGING
WINDS AND LARGE HAIL THE PRIMARY THREATS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

SOME SHOWERS AND THUNDERSTORMS WILL CONTINUE TO BE IN THE FORECAST
THE LATTER HALF OF THE WEEKEND INTO EARLY NEXT WEEK. SOME OF THESE
THUNDERSTORMS MAY BECOME SEVERE...ESPECIALLY ON SUNDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED AT TIMES DURING THE WEEKEND.

In the hours before

Local storm report, May 15, 7:22 PM EDT, 36 minutes before

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Local storm report, May 15, 7:36 PM EDT, 22 minutes before

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Special weather statement, May 15, 7:37 PM EDT, 21 minutes before

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Special weather statement, May 15, 7:40 PM EDT, 18 minutes before

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Special weather statement, May 15, 7:42 PM EDT, 16 minutes before

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Special weather statement, May 15, 7:49 PM EDT, 9 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 15, 4:56 PM EDT	Severe Thunderstorm Warning	MRX	Polk	49 min
May 15, 5:09 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton	51 min
May 15, 5:18 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Washington	27 min
May 15, 5:26 PM EDT	Areal Flood Advisory	MRX	Bledsoe	3 hr
May 15, 5:59 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Meigs	61 min
May 15, 6:38 PM EDT	Severe Thunderstorm Warning	MRX	Johnson	52 min
May 15, 7:08 PM EDT	Severe Thunderstorm Warning	MRX	Russell, Washington	37 min
May 15, 7:33 PM EDT	Severe Thunderstorm Warning	MRX	Russell	42 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2010 Severe Thunderstorm Warnings in Virginia, 2010 Every severe thunderstorm warning in 2010

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.