Alert archive / Tennessee / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 308, NWS Morristown, TN

September 9, 20094 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Sep 9, 2009, 11:02 AM EDT for 4 counties in Tennessee. It was in force for 58 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: Sep 9, 2009, 11:02 AM EDT (15:02 UTC)
Expired: Sep 9, 2009, 12:00 PM EDT
In force: 58 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Carter County, TN, Greene County, TN, Unicoi County, TN, Washington County, TN

The radar

The Knoxville radar (KMRX), 83 km from the middle of the area, began a volume at 15:03 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

Roanoke, VA (KRNK), launched 12:00Z, 3.0 hours before the alert went out and 287 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: 202 J/kg
Mixed-layer CIN: -102 J/kg
Mixed-layer LCL: 591 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 46 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 Sep 9, 9:34 AM EDT, 1 hour 28 minutes earlier.

Area forecast discussion, Sep 9, 9:34 AM EDT, 1 hour 28 minutes before

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Hazardous weather outlook, Sep 9, 5:15 AM EDT, 5 hours 47 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
515 AM EDT WED SEP 9 2009

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-100915-
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-
515 AM EDT WED SEP 9 2009 /415 AM CDT WED SEP 9 2009/

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

.DAY ONE...TODAY AND TONIGHT

AN UPPER LEVEL LOW SYSTEM TO THE NORTH WILL DRIFT ACROSS THE
REGION. SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP TODAY...SOME
OF WHICH WILL PRODUCE HEAVY RAIN AND CAUSE ISOLATED MINOR FLOODING.
A FEW OF THE STORMS COULD BECOME STRONG TO SEVERE LEVELS WITH
STRONG WINDS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THE UPPER LEVEL LOW WILL LINGER TO THE NORTH ON THURSDAY. SCATTERED
SHOWERS AND THUNDERSTORMS WILL DEVELOP AGAIN ON THURSDAY...A FEW
OF THE STORMS COULD BECOME STRONG TO SEVERE WITH STRONG WINDS. SOME
OF STORMS MAY PRODUCE HEAVY RAIN AGAIN AND CAUSE ISOLATED MINOR
FLOODING.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED DUE TO THE ISOLATED NATURE OF
THE SEVERE WEATHER THREAT.

In the hours before

Special weather statement, Sep 9, 10:06 AM EDT, 56 minutes before

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Special weather statement, Sep 9, 10:08 AM EDT, 54 minutes before

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Local storm report, Sep 9, 10:18 AM EDT, 44 minutes before

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Special weather statement, Sep 9, 10:20 AM EDT, 42 minutes before

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Special weather statement, Sep 9, 10:23 AM EDT, 39 minutes before

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Special weather statement, Sep 9, 10:30 AM EDT, 32 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
Sep 8, 8:11 PM EDT	Areal Flood Advisory	MRX	Bledsoe, Hamilton, Sequatchie	3 hr
Sep 8, 8:37 PM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Rhea, Sequatchie	53 min
Sep 8, 8:46 PM EDT	Flash Flood Warning	MRX	Bledsoe	80 min
Sep 8, 9:41 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Grainger, Union	64 min
Sep 9, 3:01 AM EDT	Areal Flood Advisory	MRX	Greene	119 min
Sep 9, 9:19 AM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene	41 min
Sep 9, 10:58 AM EDT	Severe Thunderstorm Warning	MRX	Carter, Sullivan	47 min
Sep 9, 3:20 PM EDT	Areal Flood Advisory	MRX	Hamilton	3 hr
Sep 9, 3:27 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton	63 min
Sep 9, 8:31 AM EDT	Areal Flood Advisory	MRX	Scott, Wise, City of Norton	3 hr

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.