Alert archive / Tennessee / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 172, NWS Morristown, TN

July 6, 2008Cocke County, Jefferson County, Sevier County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 6, 2008, 5:04 AM EDT for Cocke County, Jefferson County, Sevier County, Tennessee. It was in force for 41 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
Jul 6, 2008, 5:04 AM EDT (09:04 UTC)
Expired
Jul 6, 2008, 5:45 AM EDT
In force
41 min
Issued by
NWS Morristown, TN
Area
Storm-based polygon

Counties Cocke County, TN, Jefferson County, TN, Sevier County, TN

The radar

The Knoxville radar (KMRX), 28 km from the middle of the area, began a volume at 08:58 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 nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 9.1 hours before the alert went out and 292 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, Nashville Metro, TN at 00:00Z on 2008-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 55 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, Nashville Metro, TN at 00:00Z on 2008-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
55 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
1699 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
53 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 Jul 6, 3:00 AM EDT, 2 hours 4 minutes earlier.

Area forecast discussion, Jul 6, 3:00 AM EDT, 2 hours 4 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
300 AM EDT SUN JUL 6 2008

.SHORT TERM (TODAY AND TONIGHT)...SURFACE FRONTAL BOUNDARY LOSES
IDENTITY ACROSS CUMBERLAND PLATEAU THROUGH PERIOD. UPPER TROUGH WILL
MOVE ESE INTO THE AREA TODAY AND TONIGHT. THUNDERSTORM CHANCE CONTINUES
UNTIL TROUGH AXIS MOVES INTO THE MNTS TONIGHT. DRY AIR SWINGING THROUGH
THE TROUGH BEGINNING TO WRAP INTO THE AREA. A FEW DOWNDRAFTS MAY BE
ENHANCED BY EVAPORATION BUT SHOULD STAY BELOW SEVERE LIMITS. TEMPS NEAR
CLIMO.

.LONG TERM (MONDAY THROUGH SATURDAY)...OVERALL...MADE LITTLE CHANGE
TO THE EXTENDED.  A FEW SHOWERS/THUNDERSTORMS MAY LINGER OVER THE
REGION ON MONDAY...MAINLY NORTH AND EAST LOCATIONS...AS AN UPPER
TROUGH EXITS THE AREA.  MODELS BRING IN A SURFACE BOUNDARY AROUND
THE TUESDAY/WEDNESDAY TIME FRAME.  MODEL HAVE BEEN IN POOR AGREEMENT
WITH TIMING AND SOUTHERN PROGRESSION OF THE BOUNDARY SO CONFIDENCE
LOW ON DETAILS...BUT HAVE KEPT BEST CHANCE OF PRECIP ON WEDNESDAY.
BOUNDARY REMAINS IN THE REGION THURSDAY WITH A WEAK WAVE TRACKING
ALONG IT.  WILL SEE CONTINUED UNSETTLED CONDITIONS THROUGH THE REST
OF THE EXTENDED AS A COUPLE OF WEAK SHORT WAVES MOVE THROUGH THE
AREA.

&&

.PRELIMINARY POINT TEMPS/POPS...
CHATTANOOGA AIRPORT, TN             89  68  93  70  91 /  30  10  10  10  20
KNOXVILLE MCGHEE TYSON AIRPORT, TN  87  66  91  69  89 /  20  20  10  10  20
OAK RIDGE, TN                       86  66  93  69  90 /  20  10  10  10  20
TRI CITIES AIRPORT, TN              84  63  88  64  88 /  30  20  20  10  30

&&

.MRX WATCHES/WARNINGS/ADVISORIES...
NC...NONE.
TN...NONE.
VA...NONE.
&&

SON/MJB
Hazardous weather outlook, Jul 5, 5:48 AM EDT, 23 hours 16 minutes before
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In the hours before

Special weather statement, Jul 5, 11:32 PM EDT, 5 hours 32 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1132 PM EDT SAT JUL 5 2008

NCZ060-061-060430-
CHEROKEE-CLAY-
1132 PM EDT SAT JUL 5 2008

...A STRONG THUNDERSTORM WILL BE AFFECTING CHEROKEE AND CLAY
COUNTIES...

AT 1130 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM NEAR MURPHY...MOVING EAST AT 15 MPH.

SMALL HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM.

IN ADDITION TO SMALL HAIL AND GUSTY WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES PRIMARY KILLERS. REMEMBER...
IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING.

LOCALLY HEAVY RAINS...IN EXCESS OF ONE INCH PER HOUR...MAY OCCUR WITH
THIS THUNDERSTORM. 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

DH
Special weather statement, Jul 6, 1:27 AM EDT, 3 hours 37 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
127 AM EDT SUN JUL 6 2008

TNZ099>102-060630-
BRADLEY-EAST POLK-HAMILTON-WEST POLK-
127 AM EDT SUN JUL 6 2008

...STRONG THUNDERSTORMS WILL BE AFFECTING BRADLEY...HAMILTON AND POLK
COUNTIES...

AT 124 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORMS NEAR CLEVELAND...MOVING EAST AT 20 MPH.

PEA SIZE HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM.

HEAVY DOWNPOURS OF RAIN WILL ALSO ACCOMPANY THESE STORMS. LOCALIZED
SMALL STREAM AND URBAN FLOODING IS POSSIBLE.

17

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 5, 10:15 PM EDTSevere Thunderstorm WarningMRXClaiborne36 min
Jul 6, 6:39 AM EDTAreal Flood AdvisoryMRXJefferson, Knox, Sevier66 min
Jul 6, 7:28 AM EDTFlash Flood WarningMRXJefferson, Knox, Sevier3 hr
Jul 6, 3:37 PM EDTSevere Thunderstorm WarningMRXCampbell, Claiborne38 min
Jul 6, 7:50 PM EDTSevere Thunderstorm WarningMRXSullivan41 min

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.