Alert archive / Tennessee / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 8, NWS Morristown, TN

January 10, 20089 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jan 10, 2008, 9:11 PM EST for 9 counties in Tennessee. It was in force for 26 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: Jan 10, 2008, 9:11 PM EST (02:11 UTC)
Expired: Jan 10, 2008, 9:37 PM EST
In force: 26 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Claiborne County, TN, Cocke County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 13 km from the middle of the area, began a volume at 02:12 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, 2.2 hours before the alert went out and 295 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: 449 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 674 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 318 m²/s²
0-3 km storm-relative helicity: 372 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 3.0

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 Jan 10, 9:05 PM EST, 6 minutes earlier.

Area forecast discussion, Jan 10, 9:05 PM EST, 6 minutes before

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Hazardous weather outlook, Jan 10, 2:00 PM EST, 7 hours 11 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
200 PM EST THU JAN 10 2008

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-110900-
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-
200 PM EST THU JAN 10 2008 /100 PM CST THU JAN 10 2008/

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

.DAY ONE...TODAY AND TONIGHT

...SEVERE STORMS POSSIBLE LATE THIS AFTERNOON AND EVENING FOR
THE PLATEAU AND SOUTHERN HALF OF THE TENNESSEE VALLEY.

A STRONG LOW PRESSURE SYSTEM WILL AFFECT THE AREA TODAY AND
TONIGHT. STRONG GUSTY WINDS AHEAD OF THE SYSTEM ARE
EXPECTED...ESPECIALLY IN THE HIGHER ELEVATIONS. STRONG TO SEVERE
THUNDERSTORMS ARE ALSO EXPECTED LATE THIS AFTERNOON AND THIS
EVENING. THE MAIN THREAT WILL BE DAMAGING WINDS...AND ISOLATED
TORNADOES WILL ALSO BE POSSIBLE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED ON THIS AFTERNOON AND
EVENING FOR THE PLATEAU AND SOUTHERN HALF OF THE TENNESSEE VALLEY.

In the hours before

Local storm report, Jan 10, 7:31 PM EST, 1 hour 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
731 PM EST THU JAN 10 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0655 PM     TSTM WND DMG     LA FOLLETTE             36.37N 84.13W
01/10/2008                   CAMPBELL           TN   LAW ENFORCEMENT

            NUMEROUS TREES DOWN COUNTYWIDE.

&&

Local storm report, Jan 10, 8:26 PM EST, 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
826 PM EST THU JAN 10 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0815 PM     TSTM WND DMG     ATHENS                  35.45N 84.60W
01/10/2008                   MCMINN             TN   LAW ENFORCEMENT

            SEVERAL TREES DOWN.

&&

Local storm report, Jan 10, 9:05 PM EST, 6 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
Jan 10, 7:17 PM EST	Severe Thunderstorm Warning	MRX	Claiborne, Hancock, Union	28 min
Jan 10, 7:47 PM EST	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Monroe, Polk	43 min
Jan 10, 8:24 PM EST	Areal Flood Advisory	MRX	Anderson, Campbell, Claiborne, Cocke, Grainger, Greene and 8 more	3 hr
Jan 10, 8:32 PM EST	Severe Thunderstorm Warning	MRX	McMinn, Monroe, Polk	43 min
Jan 10, 8:51 PM EST	Severe Thunderstorm Warning	MRX	Blount, Knox, Loudon, Sevier	24 min
Jan 10, 10:36 PM EST	Areal Flood Advisory	MRX	Anderson, Blount, Bradley, Campbell, Carter, Claiborne and 23 more	3 hr
Jan 11, 1:18 AM EST	Areal Flood Advisory	MRX	Carter, Johnson, Sullivan	3 hr

Nearby

Severe Thunderstorm Warnings in Tennessee, 2008 Every severe thunderstorm warning in 2008

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.