Alert archive / Tennessee / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 47, NWS Morristown, TN

April 10, 20099 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Apr 10, 2009, 5:03 AM CDT for 9 counties in Tennessee. It was in force for 42 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: Apr 10, 2009, 5:03 AM CDT (10:03 UTC)
Expired: Apr 10, 2009, 5:45 AM CDT
In force: 42 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Bledsoe County, TN, Bradley County, TN, Hamilton County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Rhea County, TN, Roane County, TN, Sequatchie County, TN

The radar

The Northeast Alabama radar (KHTX), 112 km from the middle of the area, began a volume at 10:05 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 00:00Z, 10.1 hours before the alert went out and 163 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: 3 J/kg
Mixed-layer CIN: -189 J/kg
Mixed-layer LCL: 1711 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 179 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 Apr 10, 2:35 AM CDT, 2 hours 28 minutes earlier.

Area forecast discussion, Apr 10, 2:35 AM CDT, 2 hours 28 minutes before

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Hazardous weather outlook, Apr 10, 2:20 AM CDT, 2 hours 43 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
320 AM EDT FRI APR 10 2009

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-110730-
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-
320 AM EDT FRI APR 10 2009 /220 AM CDT FRI APR 10 2009/

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

.DAY ONE...TODAY AND TONIGHT

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON
AND EVENING. STRONG TO SEVERE THUNDERSTORMS WILL DEVELOP ACROSS
MIDDLE TENNESSEE..CENTRAL KENTUCKY...AND NORTHERN ALABAMA EARLY
THIS AFTERNOON...THEN MOVE EAST ACROSS THE REGION. THE GREATEST
THREAT FOR SEVERE STORMS WILL BE BETWEEN 4 AND 10 PM TODAY WITH
THE MAIN CONCERN BEING LARGE HAIL AND DAMAGING WINDS...BUT ISOLATED
TORNADOES ARE ALSO POSSIBLE.

HAZARDOUS WEATHER IS EXPECTED.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

ANOTHER ROUND OF THUNDERSTORMS IS POSSIBLE MONDAY AFTERNOON AND
EVENING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED THIS AFTERNOON AND
EVENING.

In the hours before

Special weather statement, Apr 10, 2:11 AM CDT, 2 hours 52 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
Apr 10, 2:28 PM CDT	Tornado Warning	MRX	Marion	47 min
Apr 10, 2:43 PM CDT	Tornado Warning	MRX	Bledsoe, Sequatchie	47 min
Apr 10, 2:54 PM CDT	Severe Thunderstorm Warning	MRX	Marion	51 min
Apr 10, 3:03 PM CDT	Severe Thunderstorm Warning	MRX	Hamilton	42 min
Apr 10, 3:12 PM CDT	Tornado Warning	MRX	Bledsoe, Bradley, Hamilton, McMinn, Marion, Meigs and 2 more	48 min
Apr 10, 3:24 PM CDT	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Union	36 min
Apr 10, 3:27 PM CDT	Severe Thunderstorm Warning	MRX	Claiborne, Hancock	48 min
Apr 10, 3:37 PM CDT	Severe Thunderstorm Warning	MRX	Anderson, Blount, Knox, Loudon, McMinn, Meigs and 3 more	53 min
Apr 10, 3:43 PM CDT	Tornado Warning	MRX	Bradley, Hamilton, McMinn, Monroe, Polk	62 min
Apr 10, 3:45 PM CDT	Tornado Warning	MRX	Anderson, Knox, Loudon, Roane	60 min
Apr 10, 3:56 PM CDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton	34 min
Apr 10, 4:18 PM CDT	Tornado Warning	MRX	Hancock	42 min
Apr 10, 4:26 PM CDT	Severe Thunderstorm Warning	MRX	Blount, Sevier	64 min
Apr 10, 4:32 PM CDT	Severe Thunderstorm Warning	MRX	Grainger, Hamblen, Jefferson, Knox, Union	28 min
Apr 10, 5:03 PM CDT	Severe Thunderstorm Warning	MRX	Cocke, Grainger, Greene, Hamblen, Hawkins, Jefferson and 1 more	34 min
Apr 10, 3:40 PM CDT	Tornado Warning	MRX	Lee	33 min
Apr 10, 4:45 PM CDT	Tornado Warning	MRX	Lee, Scott, Wise, City of Norton	60 min
Apr 10, 4:15 PM CDT	Tornado Warning	MRX	Cherokee, Clay	60 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.