Alert archive / Tennessee / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 62, NWS Morristown, TN

June 5, 2013Grainger County, Hamblen County, Jefferson County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jun 5, 2013, 4:30 PM EDT for Grainger County, Hamblen County, Jefferson County, Tennessee. It was in force for 45 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
Jun 5, 2013, 4:30 PM EDT (20:30 UTC)
Expired
Jun 5, 2013, 5:15 PM EDT
In force
45 min
Issued by
NWS Morristown, TN
Area
Storm-based polygon

Counties Grainger County, TN, Hamblen County, TN, Jefferson County, TN

The radar

The Knoxville radar (KMRX), 2 km from the middle of the area, began a volume at 20:32 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.5 hours before the alert went out and 328 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, Peachtre/Fal Fld, GA at 12:00Z on 2013-06-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1227 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, Peachtre/Fal Fld, GA at 12:00Z on 2013-06-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 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
1227 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
558 m above ground
0-6 km bulk shear
3 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
-34 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 Jun 5, 4:30 PM EDT, 0 minutes earlier.

Area forecast discussion, Jun 5, 4:30 PM EDT, 0 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
430 PM EDT WED JUN 5 2013

.SHORT TERM (TONIGHT AND THURSDAY)...A MOIST AIR MASS WILL BE
BUILDING OVER THE AREA THROUGH THE SHORT TERM...WITH SEVERAL VORT
MAXES MOVING THROUGH A BROAD TROUGH OVER THE REGION. WITH A LACK OF
SYNOPTIC SCALE FORCING MECHANISMS...THESE DISTURBANCES WILL BE THE
MAIN FACTORS IN INITIATING SHOWERS AND THUNDERSTORMS...AND
UNFORTUNATELY THE MODELS ARE NOT IN GOOD AGREEMENT ON THEIR TIMING.
GENERALLY...THE BEST PRECIP CHANCES APPEAR TO BE IN SOUTHERN AND
WESTERN PORTIONS OF THE AREA AS THE DISTURBANCES TRACK TO THE
NE...AND A SE 850 MB FLOW SUPPLIES LOW LEVEL MOISTURE. SCATTERED
SHOWERS WILL BE POSSIBLE THROUGH THE NIGHT...BUT IT APPEARS THAT
RAIN CHANCES WILL INCREASE THURSDAY AS THE MIDLEVEL TROUGH AXIS GETS
A LITTLE CLOSER. WILL HAVE CHANCE TO LIKELY POPS IN THE
MORNING...RISING TO LIKELY TO CATEGORICAL IN THE AFTERNOON. SEVERE
THREAT LOOKS LOW THROUGH THE PERIOD...BUT SLOW MOVING OR TRAINING
STORMS COULD PRODUCE SOME LOCALIZED FLOODING IN THE PLATEAU BOTH
THIS EVENING AND TOMORROW.

.LONG TERM (THURSDAY NIGHT THROUGH WEDNESDAY)...WILL BE IN A RATHER
UNSETTLED WEATHER PATTERN FOR THE EXTENDED.  THURSDAY NIGHT THROUGH
SATURDAY...A FRONTAL BOUNDARY MOVING THROUGH THE AREA AND AN AREA OF
LOW PRESSURE MOVING NORTHWARD JUST EAST OF THE MRX CWA WILL
GENERATES LIKELY TO CATEGORICAL POPS.  WILL BE BETWEEN WEATHER
SYSTEMS ON SUNDAY.  FOR THE REST OF THE EXTENDED...MODELS TRENDING
TOWARDS KEEP THE STATIONARY BOUNDARY TO OUR NORTH ALONG THE OHIO
RIVER VALLEY.  THIS COMBINED WITH DIURNAL HEATING SHOULD PROVIDE
ISOLATED TO SCATTERED THUNDERSTORM EACH DAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
CHATTANOOGA AIRPORT, TN  68  80  67  83  64 /  60  70  70  60  40
KNOXVILLE AIRPORT, TN    67  81  65  81  62 /  50  70  70  70  50
OAK RIDGE, TN            67  79  65  80  62 /  60  80  70  70  50
TRI CITIES AIRPORT, TN   64  80  62  78  59 /  40  80  80  80  70

&&

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

&&

DGS/MJB
Hazardous weather outlook, Jun 5, 3:55 AM EDT, 12 hours 35 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
355 AM EDT WED JUN 5 2013

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-060800-
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-
355 AM EDT WED JUN 5 2013 /255 AM CDT WED JUN 5 2013/

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

.DAY ONE...TODAY AND TONIGHT...

THERE MAY BE SOME BRIEF ISOLATED SEVERE STORMS THIS
AFTERNOON...WITH HAIL UP TO QUARTER SIZE AND DAMAGING WINDS IN
EXCESS OF 60 MPH.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

A WEAK COLD FRONT WILL APPROACH THE SOUTHERN APPALACHIAN REGION
LATER THIS WEEK...AS TROPICAL MOISTURE MOVES NORTHWARD FROM THE GULF
OF MEXICO. AS A RESULT...LOCALLY HEAVY RAINFALL LEADING TO THE
POTENTIAL FOR FLOODING WILL BE POSSIBLE FROM THURSDAY THROUGH
FRIDAY.

.SPOTTER INFORMATION STATEMENT...

THIS AFTERNOON...THERE MAY BE A BRIEF PERIOD FOR LOCAL SPOTTER
ACTIVATION.

In the hours before

Special weather statement, Jun 5, 3:02 PM EDT, 1 hour 28 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
302 PM EDT WED JUN 5 2013

TNZ083-084-099-100-051945-
BRADLEY TN-HAMILTON TN-MEIGS TN-RHEA TN-
302 PM EDT WED JUN 5 2013

...SIGNIFICANT WEATHER ADVISORY FOR MEIGS...HAMILTON...BRADLEY AND
RHEA COUNTIES UNTIL 345 PM EDT...

AT 259 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR SODDY-DAISY...OR 11 MILES NORTH OF
CHATTANOOGA...MOVING NORTHEAST AT 30 MPH.

WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH
HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...DAYTON...
SODDY-DAISY...SHADY GROVE...SALE CREEK...GRAYSVILLE...HOPEWELL AND
BIRCHWOOD.

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

DGS
Special weather statement, Jun 5, 3:41 PM EDT, 49 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
341 PM EDT WED JUN 5 2013

TNZ069-071-073-052030-
KNOX TN-NORTH SEVIER TN-NW BLOUNT TN-
341 PM EDT WED JUN 5 2013

...SIGNIFICANT WEATHER ADVISORY FOR BLOUNT...EXTREME WESTERN SEVIER
AND KNOX COUNTIES UNTIL 430 PM EDT...

AT 339 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR EAGLETON VILLAGE...OR 5 MILES EAST OF
ALCOA...MOVING NORTHEAST AT 20 MPH.

HAIL UP TO THE SIZE OF DIMES OR PENNIES AND WIND GUSTS UP TO 50 MPH
ARE EXPECTED WITH THIS STORM.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...WILDWOOD...SEYMOUR
AND LAKE FOREST.

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

IN ADDITION...THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR
LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR
ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL
WEATHER SERVICE.

DGS
Special weather statement, Jun 5, 4:03 PM EDT, 27 minutes before
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Special weather statement, Jun 5, 4:06 PM EDT, 24 minutes before
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Special weather statement, Jun 5, 4:14 PM EDT, 16 minutes before
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Special weather statement, Jun 5, 4:26 PM EDT, 4 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 5, 2:36 PM EDTSevere Thunderstorm WarningMRXMonroe24 min
Jun 5, 2:50 PM EDTAreal Flood AdvisoryMRXMonroe115 min
Jun 5, 3:37 PM EDTAreal Flood AdvisoryMRXMcMinn113 min
Jun 5, 3:46 PM EDTFlash Flood WarningMRXLoudon, McMinn, Monroe3 hr
Jun 5, 4:26 PM EDTAreal Flood AdvisoryMRXHamilton109 min
Jun 5, 4:55 PM EDTAreal Flood AdvisoryMRXBlount, Hamblen, Jefferson, Knox, Sevier3 hr
Jun 5, 5:30 PM EDTSevere Thunderstorm WarningMRXGrainger, Hancock, Hawkins30 min
Jun 5, 5:34 PM EDTSevere Thunderstorm WarningMRXBlount, Sevier41 min
Jun 5, 5:48 PM EDTSevere Thunderstorm WarningMRXPolk42 min
Jun 5, 5:59 PM EDTAreal Flood AdvisoryMRXGrainger, Hancock, Hawkins3 hr

Nearby

Severe Thunderstorm Warnings in Tennessee, 2013Every severe thunderstorm warning in 2013

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.