Alert archive / Tennessee / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 121, NWS Morristown, TN

June 10, 20096 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jun 10, 2009, 2:27 PM EDT for 6 counties in Tennessee. It was in force for 63 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 10, 2009, 2:27 PM EDT (18:27 UTC)
Expired: Jun 10, 2009, 3:30 PM EDT
In force: 63 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Anderson County, TN, Blount County, TN, Knox County, TN, Loudon County, TN, Morgan County, TN, Roane County, TN

The radar

The Knoxville radar (KMRX), 82 km from the middle of the area, began a volume at 18:29 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, 6.5 hours before the alert went out and 212 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: 2072 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 870 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 151 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

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 10, 1:30 PM EDT, 57 minutes earlier.

Area forecast discussion, Jun 10, 1:30 PM EDT, 57 minutes before

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Hazardous weather outlook, Jun 10, 4:14 AM EDT, 10 hours 13 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
414 AM EDT WED JUN 10 2009

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-110815-
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-
414 AM EDT WED JUN 10 2009 /314 AM CDT WED JUN 10 2009/

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

.DAY ONE...TODAY AND TONIGHT

ISOLATED TO SCATTERED THUNDERSTORMS WILL DEVELOP...MAINLY THIS
AFTERNOON AND LINGER THROUGHOUT THE EVENING AND OVERNIGHT. A FEW
STRONG TO SEVERE STORMS WILL BE POSSIBLE...ESPECIALLY THIS
AFTERNOON AND EVENING. THE MAIN THREATS WILL BE DAMAGING WINDS OF
50 MPH OR MORE AND HAIL OF PENNY SIZE OR LARGER. BRIEF LOCALLY
HEAVY RAINS COULD OCCUR WITH THE STRONGEST STORMS...WITH FREQUENT
DEADLY LIGHTNING STRIKES IN AND NEAR ALL STORMS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

 A WEAK COLD FRONT MOVING SLOWLY SOUTH INTO THE REGION IS EXPECTED
TO INCREASE THE COVERAGE OF THUNDERSTORMS THURSDAY AND THURSDAY
NIGHT. SCATTERED STRONG TO SEVERE STORMS WILL BE POSSIBLE...WITH
THE MAIN THREATS DAMAGING DOWN BURSTS WINDS OF 50 MPH OR HIGHER...
AND LARGE HAIL.

OTHERWISE...ISOLATED STRONG TO SEVERE THUNDERSTORMS WILL BE
POSSIBLE JUST ABOUT EACH AFTERNOON AND EVENING...FROM FRIDAY INTO
EARLY NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED...MAINLY TODAY AND THURSDAY.

TG

In the hours before

Special weather statement, Jun 10, 1:21 PM EDT, 1 hour 6 minutes before

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Special weather statement, Jun 10, 2:11 PM EDT, 16 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
Jun 10, 2:30 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Monroe, Polk	60 min
Jun 10, 2:38 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Union	34 min
Jun 10, 3:15 PM EDT	Severe Thunderstorm Warning	MRX	Jefferson, Knox, Sevier	60 min
Jun 10, 6:10 PM EDT	Areal Flood Advisory	MRX	Anderson, Blount, Campbell, Claiborne, Cocke, Grainger and 6 more	110 min
Jun 10, 6:15 PM EDT	Areal Flood Advisory	MRX	Hancock, Hawkins	2 hr
Jun 10, 6:54 PM EDT	Areal Flood Advisory	MRX	Campbell, Scott	111 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2009 Every severe thunderstorm warning in 2009

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.