Alert archive / Tennessee / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 34, NWS Morristown, TN

March 4, 2008Sullivan County, Washington County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Mar 4, 2008, 5:20 PM EST for Sullivan County, Washington County, Tennessee. It was in force for 25 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, 5:20 PM EST (22:20 UTC)
Expired
Mar 4, 2008, 5:45 PM EST
In force
25 min
Issued by
NWS Morristown, TN
Area
Storm-based polygon

Counties Sullivan County, TN, Washington County, TN

The radar

The Knoxville radar (KMRX), 93 km from the middle of the area, began a volume at 22:19 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.

IssuedProductOfficeLasted
Mar 4, 4:31 PM ESTTornado WatchSPC8 hr

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 10.3 hours before the alert went out and 227 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-pSkew-T log-p diagram, Greensboro/Hi Pt, NC at 12:00Z on 2008-03-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 76 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 12:00Z on 2008-03-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 281 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
76 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
578 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
281 m²/s²
0-3 km storm-relative helicity
331 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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, 4:12 PM EST, 1 hour 8 minutes earlier.

Area forecast discussion, Mar 4, 4:12 PM EST, 1 hour 8 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
412 PM EST TUE MAR 4 2008

.SHORT TERM...(TONIGHT THROUGH WEDNESDAY)...COLD FRONT PASSING
THROUGH THE CENTRAL SECTIONS OF THE FORECAST AREA WITH THIN LINE OF
STRONG CONVECTION JUST AHEAD OF IT. CONVECTION WILL MOVE QUICKLY
EAST OF FORECAST AREA BY EARLY THIS EVENING. TEMPERATURES WILL TAKE
A BIG DROP BEHIND THE FRONT WITH SOME SNOW SHOWERS NORTHERN
SECTIONS WITH WRAP AROUND CLOUDINESS AND UPSLOPE FLOW. ANY SNOWFALL
SHOULD BE MINOR WITH LOWS DROPPING INTO THE UPPER 30S MOST PLACES
ONLY HIGHER ELEVATIONS MAY REACH THE LOWER 30S. HIGH PRESSURE BUILDS
IN WEDNESDAY WITH CLOUDS DECREASING DURING THE MORNING. FOLLOWED A
NAM/GFS BLEND FOR HIGHS WEDNESDAY.

.LONG TERM...(WEDNESDAY NIGHT THROUGH TUESDAY)...HIGH PRESSURE
WILL BUILD ACROSS THE FORECAST AREA WEDNESDAY NIGHT INTO
THURSDAY...WITH A DRY BUT UNSEASONABLY COLD AIR MASS. A WEAK COLD
FRONT WILL THEN MOVE INTO THE FORECAST AREA ON THURSDAY...AND
BECOME QUASI- STATIONARY OVER THE REGION BY THURSDAY NIGHT. MODELS
INDICATE THAT MOISTURE WILL BE LIMITED WITH THIS FRONT...SO WILL
MENTION A DRY FORECAST FOR THURSDAY. BY THURSDAY NIGHT...A BROAD
UPPER-LEVEL TROUGH WILL AMPLIFY OVER THE MS RIVER VALLEY AND
DEVELOP A SURFACE LOW ALONG THE CAROLINA COAST ON FRIDAY. AS A
RESULT...RAIN WILL SPREAD OVER THE FORECAST AREA THURSDAY NIGHT
INTO FRIDAY...WITH RAIN CHANGING TO SNOW BY FRIDAY AFTERNOON INTO
FRIDAY NIGHT AS COLDER AIR MOVES IN BEHIND THE DEPARTING LOW. HIGH
PRESSURE THEN BUILDS OVER THE REGION FOR THE WEEKEND...WITH TEMPS
QUICKLY WARMING ON SUNDAY AS WINDS BECOME SOUTHWESTERLY. BOTH THE
GFS AND ECMWF MODELS INDICATE THAT ANOTHER WEAK COLD FRONT WILL
AFFECT THE FORECAST AREA BY THE FIRST OF NEXT WEEK. WILL TREND
TOWARD THE SLOWER BUT MORE CONSISTENT ECMWF SOLUTION...WITH A
SLIGHT CHANCE FOR PRECIP ON TUESDAY. AS FOR TEMPS...GFS NUMBERS
LOOK REASONABLE AND DID NOT DEVIATE MUCH FROM THEM.
&&

.PRELIMINARY POINT TEMPS/POPS...
CHATTANOOGA AIRPORT, TN  36  57  38  63  41 / 20  0  0  10  40
KNOXVILLE AIRPORT, TN    37  55  36  61  40 / 40  0  0  10  30
OAK RIDGE, TN            36  54  36  61  40 / 30  0  0  10  30
TRI CITIES AIRPORT, TN   40  53  33  60  39 / 60 10  0  10  20
&&

.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: CLAIBORNE...COCKE SMOKY MOUNTAINS...GRAINGER...
     HAMBLEN...HANCOCK...HAWKINS...JEFFERSON...JOHNSON...NORTH
     SEVIER...NORTHWEST CARTER...NORTHWEST COCKE...NORTHWEST
     GREENE...SEVIER SMOKY MOUNTAINS...SOUTHEAST CARTER...
     SOUTHEAST GREENE...SULLIVAN...UNICOI...UNION...WASHINGTON
     TN.

VA...WIND ADVISORY UNTIL 7 PM EST THIS EVENING FOR THE FOLLOWING
     ZONES: LEE...RUSSELL...SCOTT...WASHINGTON...WISE.

&&

TD/DMG
Hazardous weather outlook, Mar 4, 5:30 AM EST, 11 hours 50 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, 2:44 PM EST, 2 hours 36 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
Local storm report, Mar 4, 3:31 PM EST, 1 hour 49 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
331 PM EST TUE MAR 04 2008

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

0258 PM     TSTM WND DMG     KNOXVILLE               35.97N 83.95W
03/04/2008                   KNOX               TN   LAW ENFORCEMENT

            NUMEROUS TREES DOWN COUNTY WIDE

&&

CAC
Special weather statement, Mar 4, 3:55 PM EST, 1 hour 25 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
355 PM EST TUE MAR 4 2008

TNZ015>017-038>047-VAZ001-002-005-042200-
COCKE SMOKY MOUNTAINS-GRAINGER-HAMBLEN-HANCOCK-HAWKINS-LEE-NORTHWEST
CARTER-NORTHWEST COCKE-NORTHWEST GREENE-SCOTT-SOUTHEAST
CARTER-SOUTHEAST GREENE-SULLIVAN-UNICOI-WASHINGTON-WISE-
355 PM EST TUE MAR 4 2008

...STRONG THUNDERSTORMS WILL AFFECT NORTHEAST TENNESSEE AND
SOUTHWEST VIRGINIA THROUGH 5 PM...

AT 353 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR SNEEDVILLE TO
NEAR PARROTTSVILLE...MOVING NORTHEAST AT 60 MPH.

THESE STORMS WILL BE NEAR...
  JONESVILLE BY 400 PM EST.
  ROGERSVILLE BY 405 PM EST.
  PENNINGTON GAP BY 410 PM EST.
  TUSCULUM BY 415 PM EST.
  ERWIN BY 425 PM EST.
  KINGSPORT BY 430 PM EST.

WINDS UP TO 40 MPH ARE EXPECTED WITH SOME OF THESE STORMS.

IN ADDITION TO THE WINDS...OCCASIONAL CLOUD TO GROUND LIGHTNING...
AND LOCALLY HEAVY RAINFALL WILL BE POSSIBLE WITH SOME OF THESE
THUNDERSTORMS.

DMG
Local storm report, Mar 4, 4:17 PM EST, 1 hour 3 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
417 PM EST TUE MAR 04 2008

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

0330 PM     TSTM WND DMG     JEFFERSON CITY          36.12N 83.49W
03/04/2008                   JEFFERSON          TN   LAW ENFORCEMENT

            3 TREES DOWN ACROSS COUNTY AROUND 330 PM EDT.

&&

CAC
Special weather statement, Mar 4, 4:52 PM EST, 28 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
452 PM EST TUE MAR 4 2008

TNZ016>018-042>047-VAZ001-002-005-006-008-042245-
HAWKINS-JOHNSON-LEE-NORTHWEST CARTER-NORTHWEST
GREENE-RUSSELL-SCOTT-SOUTHEAST CARTER-SOUTHEAST
GREENE-SULLIVAN-UNICOI-WASHINGTON-WISE-
452 PM EST TUE MAR 4 2008

...A LINE OF STRONG THUNDERSTORMS WERE AFFECTING CARTER...CITY OF
BRISTOL...CITY OF
NORTON...GREENE...HAWKINS...JOHNSON...LEE...RUSSELL...SCOTT...
SULLIVAN...UNICOI...WASHINGTON AND WISE COUNTIES...

AT 449 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
A LINE OF STRONG THUNDERSTORMS 7 MILES EAST OF
SURGOINSVILLE...MOVING NORTHEAST AT 40 MPH.

WINDS 30 TO 40 MPH ARE EXPECTED WITH THESE STORMS.

LOCALLY HEAVY RAINS...IN EXCESS OF ONE INCH PER HOUR...MAY OCCUR WITH
THESE THUNDERSTORMS. MOTORISTS SHOULD BE ALERT FOR PONDING OF WATER
ON ROADWAYS...AND POSSIBLE MINOR FLOODING OF LOW LYING AREAS. DO NOT
DRIVE THROUGH WATERS OF UNKNOWN DEPTH. TURN AROUND DONT DROWN
Local storm report, Mar 4, 4:56 PM EST, 24 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Mar 4, 12:56 PM ESTSevere Thunderstorm WarningMRXBradley, Hamilton49 min
Mar 4, 1:17 PM ESTSevere Thunderstorm WarningMRXMcMinn, Meigs, Rhea58 min
Mar 4, 1:21 PM ESTSevere Thunderstorm WarningMRXPolk54 min
Mar 4, 1:55 PM ESTSevere Thunderstorm WarningMRXLoudon, Monroe50 min
Mar 4, 2:10 PM ESTSevere Thunderstorm WarningMRXRoane25 min
Mar 4, 2:20 PM ESTSevere Thunderstorm WarningMRXAnderson, Blount, Knox55 min
Mar 4, 2:40 PM ESTSevere Thunderstorm WarningMRXCampbell31 min
Mar 4, 2:55 PM ESTSevere Thunderstorm WarningMRXClaiborne, Grainger, Union65 min
Mar 4, 3:01 PM ESTSevere Thunderstorm WarningMRXCocke, Hamblen, Jefferson, Sevier59 min
Mar 4, 4:16 PM ESTAreal Flood AdvisoryMRXCarter, Cocke, Greene, Hamblen, Hancock, Hawkins and 4 more3 hr

Nearby

Severe Thunderstorm Warnings in Tennessee, 2008Every 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.