Alert archive / Tennessee / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 32, NWS Morristown, TN

March 4, 2008Claiborne County, Grainger County, Union County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Mar 4, 2008, 2:55 PM EST for Claiborne County, Grainger County, Union County, Tennessee. It was in force for 65 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: Mar 4, 2008, 2:55 PM EST (19:55 UTC)
Expired: Mar 4, 2008, 4:00 PM EST
In force: 65 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Claiborne County, TN, Grainger County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 31 km from the middle of the area, began a volume at 19:58 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 4, 12:04 PM EST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 7.9 hours before the alert went out and 264 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: 191 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 674 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 521 m²/s²
0-3 km storm-relative helicity: 382 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

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 Mar 4, 9:45 AM EST, 5 hours 10 minutes earlier.

Area forecast discussion, Mar 4, 9:45 AM EST, 5 hours 10 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
945 AM EST TUE MAR 4 2008

.DISCUSSION...LOW PRESSURE SYSTEM CURRENTLY OVER MIDDLE TN WILL
TRACK NE INTO THE OHIO VALLEY TODAY. A SHARP COLD FRONT WAS LOCATED
FROM NASHVILLE SOUTH TO THE CENTRAL GULF COAST. SHOWERS AND SOME
THUNDERSTORMS ARE OCCURRING ACROSS THE EASTERN HALF OF THE FORECAST
AREA THIS MORNING WITH MORE SHOWERS AND THUNDERSTORMS DEVELOPING
JUST AHEAD OF THE COLD FRONT. TEMPERATURES WERE IN THE 50S AND LOWER
60S AREAWIDE WITH GUSTY SOUTH TO SOUTHWEST WINDS. TORNADO WATCH IN
EFFECT UNTIL 15Z FOR FOUR SOUTHERN PLATEAU AND SOUTHERN VALLEY
COUNTIES. WITH IMPRESSIVE WIND PROFILE AND THE UPPER TROUGH STILL TO
COME THROUGH THIS AFTERNOON SEVERE THUNDERSTORMS STILL POSSIBLE IF
UPPER DIVERGENCE MOVES OVER THE AREA. DAMAGING WIND AND LARGE HAIL
STILL MIGHT OCCUR ACROSS THE NORTHERN PART OF THE FORECAST AREA
THROUGH THE AFTERNOON. WILL KEEP WIND ADVISORIES IN PLACE THROUGH
21Z AS WINDS INCREASE AHEAD OF COLD FRONT AND SURFACE LOW. INCREASED
RAIN CHANCES FOR THE DAY WITH ACTIVITY THAT FORMS AHEAD OF THE FRONT
AND ADJUSTED HIGH TEMPERATURES. HIGHS AFTER MIDNIGHT IN THE MID TO
UPPER 60S WILL LIKELY BE REACHED AGAIN TODAY BEFORE COLD FRONT MOVES
THROUGH. INCREASED QPF AMOUNTS SOME FOR THE DAY PERIODS. UPDATE OUT
AT 15Z TO REMOVE TORNADO WATCH.
&&

.MRX WATCHES/WARNINGS/ADVISORIES...
NC...WIND ADVISORY UNTIL 7 PM EST THIS EVENING FOR THE FOLLOWING
     ZONES: CHEROKEE...CLAY.

TN...WIND ADVISORY UNTIL 7 PM EST THIS EVENING FOR THE FOLLOWING
     ZONES: BLOUNT SMOKY MOUNTAINS...COCKE SMOKY MOUNTAINS...
     EAST POLK...JOHNSON...SEVIER SMOKY MOUNTAINS...SOUTHEAST
     CARTER...SOUTHEAST GREENE...SOUTHEAST MONROE...UNICOI.

     WIND ADVISORY FROM 7 AM THIS MORNING TO 4 PM EST THIS AFTERNOON
     FOR THE FOLLOWING ZONES: ANDERSON...BRADLEY...CLAIBORNE...
     GRAINGER...HAMBLEN...HAMILTON...HANCOCK...HAWKINS...
     JEFFERSON...KNOX...LOUDON...MCMINN...MEIGS...NW BLOUNT...
     NORTH SEVIER...NORTHWEST CARTER...NORTHWEST COCKE...
     NORTHWEST GREENE...NORTHWEST MONROE...RHEA...ROANE...
     SULLIVAN...UNION...WASHINGTON TN...WEST POLK.

     WIND ADVISORY UNTIL 4 PM EST /3 PM CST/ THIS AFTERNOON FOR THE
     FOLLOWING ZONES: BLEDSOE...CAMPBELL...MARION...MORGAN...
     SCOTT TN...SEQUATCHIE.

VA...WIND ADVISORY FROM 7 AM THIS MORNING TO 4 PM EST THIS AFTERNOON
     FOR THE FOLLOWING ZONES: LEE...RUSSELL...SCOTT...
     WASHINGTON...WISE.

&&

TD

Hazardous weather outlook, Mar 4, 5:30 AM EST, 9 hours 25 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
530 AM EST TUE MAR 4 2008

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-061100-
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-
530 AM EST WED MAR 5 2008 /430 SM CDT WED MAR 5 2008/

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

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

In the hours before

Local storm report, Mar 4, 2:13 PM EST, 42 minutes before

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Local storm report, Mar 4, 2:33 PM EST, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
233 PM EST TUE MAR 04 2008

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

0218 PM     TSTM WND DMG     LOUDON                  35.74N 84.36W
03/04/2008                   LOUDON             TN   LAW ENFORCEMENT

            TREE AND POWER LINES DOWN ON HWY 11. REPORTED BY LOUDON
            COUNTY DISPATCH.

0218 PM     TSTM WND DMG     MADISONVILLE            35.52N 84.36W
03/04/2008                   MONROE             TN   LAW ENFORCEMENT

            SEVERAL TREES DOWN ACROSS WEST HALF OF COUNTY. REPORTED
            BY MONROE COUNTY DISPATCH.

&&

MEP

Local storm report, Mar 4, 2:44 PM EST, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
244 PM EST TUE MAR 04 2008

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

0232 PM     TSTM WND DMG     3 NE LENOIR CITY        35.83N 84.23W
03/04/2008                   LOUDON             TN   LAW ENFORCEMENT

            TREE AND POWER LINES DOWN ON VIRTUE RD. REPORTED BY
            LOUDON COUNTY DISPATCH.

&&

MEP

The office that day

Everything else NWS Morristown, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 4, 12:56 PM EST	Severe Thunderstorm Warning	MRX	Bradley, Hamilton	49 min
Mar 4, 1:17 PM EST	Severe Thunderstorm Warning	MRX	McMinn, Meigs, Rhea	58 min
Mar 4, 1:21 PM EST	Severe Thunderstorm Warning	MRX	Polk	54 min
Mar 4, 1:55 PM EST	Severe Thunderstorm Warning	MRX	Loudon, Monroe	50 min
Mar 4, 2:10 PM EST	Severe Thunderstorm Warning	MRX	Roane	25 min
Mar 4, 2:20 PM EST	Severe Thunderstorm Warning	MRX	Anderson, Blount, Knox	55 min
Mar 4, 2:40 PM EST	Severe Thunderstorm Warning	MRX	Campbell	31 min
Mar 4, 3:01 PM EST	Severe Thunderstorm Warning	MRX	Cocke, Hamblen, Jefferson, Sevier	59 min
Mar 4, 4:16 PM EST	Areal Flood Advisory	MRX	Carter, Cocke, Greene, Hamblen, Hancock, Hawkins and 4 more	3 hr
Mar 4, 5:20 PM EST	Severe Thunderstorm Warning	MRX	Sullivan, Washington	25 min

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.