Alert archive / Tennessee / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 181, NWS Morristown, TN

July 7, 2008Hawkins County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 7, 2008, 3:24 PM EDT for Hawkins County, Tennessee. It was in force for 36 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 7, 2008, 3:24 PM EDT (19:24 UTC)
Expired
Jul 7, 2008, 4:00 PM EDT
In force
36 min
Issued by
NWS Morristown, TN
Area
Storm-based polygon

County Hawkins County, TN

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 7.4 hours before the alert went out and 276 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 2008-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 238 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 2008-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 92 square meters per square second.19395878Sfc1 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
238 J/kg
Mixed-layer CIN
-149 J/kg
Mixed-layer LCL
887 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
92 m²/s²
0-3 km storm-relative helicity
64 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 7, 2:37 PM EDT, 47 minutes earlier.

Area forecast discussion, Jul 7, 2:37 PM EDT, 47 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
237 PM EDT MON JUL 7 2008

.SHORT TERM...(TONIGHT AND TUESDAY)...MODELS AND SREF NOW SHOW OHIO
VALLEY MCS REMAINING RELATIVELY INTACT THROUGH THIS AFTERNOON AND
POSSIBLY EFFECTING AT LEAST THE NORTHERN HALF OF THE FORECAST AREA
DURING THE FIRST PERIOD. AS SUCH...WILL GO WITH HIGH CHANCE POPS
ALONG THE NORTHERN TIER DECREASING TO SLIGHT CHANCE IN THE SOUTHERN
TIER. BOUNDARIES LEFT OVER FROM CONVECTIVE COMPLEX WILL LIKELY
PROVIDE FOCUS FOR SOME REDEVELOPMENT TOMORROW AFTERNOON. THUS
APPEARS HIGH CHANCE POPS PROJECTED BY MODEL GUIDANCE IS WARRANTED.
FOR TEMPS...FOLLOWED MAV GUIDANCE CLOSELY WITH THE EXCEPTION OF A
FEW TWEAKS TO BUMP UP MAX TEMPS IN SOME SPOTS.

.LONG TERM...(TUESDAY NIGHT THROUGH MONDAY)...
A SURFACE FRONT AND A MIDLEVEL SHORTWAVE TROUGH WILL MOVE OVER THE
OHIO VALLEY ON WEDNESDAY. 850 MB THETA-E RIDGE WILL BE OVER THE AREA
WEDNESDAY AFTERNOON...AND UPPER DIVERGENCE WILL ALSO BE INCREASING
AS THE 300 MB JET PUSHES EAST. WILL HAVE HIGH CHANCE POPS FOR
WEDNESDAY. THE GFS IS AGGRESSIVE IN PUSHING THE FRONT THROUGH THE
AREA AND BRINGING A DRIER AIR MASS INTO THE AREA FOR
THURSDAY...HOWEVER THIS IS LIKELY OVERDONE GIVEN THE STRENGTH OF THE
ATLANTIC RIDGE...AND THE NAM KEEPS THE FRONT WELL TO OUR NORTH...SO
WILL KEEP CHANCE POPS IN FOR THURSDAY.

THE REST OF THE FORECAST LOOKS LIKE A TYPICAL SUMMER TIME
PATTERN...WITH THE ATLANTIC RIDGE EXTENDING EAST ACROSS THE GULF
COAST...AND A ZONAL FLOW ALOFT. SMALL SHORTWAVES MAY PASS THROUGH
EACH DAY...BUT THESE FEATURES ARE TOO SMALL TO RESOLVE THIS FAR OUT.
WILL FOLLOW CLIMATOLOGY AND PERSISTENCE...AND HAVE DIRUNAL POPS EACH
DAY THROUGH TUESDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
CHATTANOOGA AIRPORT, TN             68  92  71  91  71 /  20  20  20  40  40
KNOXVILLE MCGHEE TYSON AIRPORT, TN  68  88  71  87  71 /  30  40  30  40  40
OAK RIDGE, TN                       68  88  70  87  70 /  30  40  30  50  40
TRI CITIES AIRPORT, TN              62  83  66  84  66 /  50  50  40  50  40

&&

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

LCM/DGS
Hazardous weather outlook, Jul 7, 6:07 AM EDT, 9 hours 17 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
607 AM EDT MON JUL 7 2008

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-081015-
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-
607 AM EDT MON JUL 7 2008 /507 AM CDT MON JUL 7 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...TUESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

In the hours before

Special weather statement, Jul 7, 2:46 PM EDT, 38 minutes before
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Local storm report, Jul 7, 3:09 PM EDT, 15 minutes before
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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Special weather statement, Jul 7, 3:21 PM EDT, 3 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
321 PM EDT MON JUL 7 2008

TNZ016-017-042-044-072000-
HAWKINS-NORTHWEST GREENE-SULLIVAN-WASHINGTON-
321 PM EDT MON JUL 7 2008

...A STRONG THUNDERSTORM WILL BE AFFECTING GREENE...HAWKINS...
SULLIVAN AND WASHINGTON COUNTIES...

AT 318 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR SURGOINSVILLE...MOVING EAST AT 29 MPH.

THIS STORM WILL BE NEAR...
  6 MILES SOUTH OF COLONIAL HEIGHTS BY 355 PM EDT.

DIME SIZE HAIL...AND WINDS 40 TO 50 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.

DGS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 6, 11:54 PM EDTSevere Thunderstorm WarningMRXCocke, Greene66 min
Jul 7, 1:37 PM EDTSevere Thunderstorm WarningMRXAnderson, Campbell, Union38 min
Jul 7, 1:45 PM EDTSevere Thunderstorm WarningMRXClaiborne45 min
Jul 7, 6:06 PM EDTSevere Thunderstorm WarningMRXClaiborne39 min
Jul 6, 9:48 PM EDTSevere Thunderstorm WarningMRXRussell57 min
Jul 6, 9:50 PM EDTAreal Flood AdvisoryMRXRussell69 min
Jul 7, 6:53 PM EDTSevere Thunderstorm WarningMRXLee, Scott53 min
Jul 6, 10:49 PM EDTSevere Thunderstorm WarningMRXCherokee, Clay56 min
Jul 6, 11:45 PM EDTSevere Thunderstorm WarningMRXCherokee, Clay45 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.