Alert archive / Tennessee / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 116, NWS Morristown, TN

July 1, 2007Bledsoe County, Hamilton County, Rhea County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 1, 2007, 3:51 PM CDT for Bledsoe County, Hamilton County, Rhea County, Tennessee. It was in force for 54 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 1, 2007, 3:51 PM CDT (20:51 UTC)
Expired
Jul 1, 2007, 4:45 PM CDT
In force
54 min
Issued by
NWS Morristown, TN
Area
Counties, with a storm outline in the text

Counties Bledsoe County, TN, Hamilton County, TN, Rhea County, TN

The radar

The Northeast Alabama radar (KHTX), 107 km from the middle of the area, began a volume at 20:51 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
Jul 1, 12:10 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 8.9 hours before the alert went out and 154 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 12:00Z on 2007-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 474 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 12:00Z on 2007-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.1939Sfc1 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
474 J/kg
Mixed-layer CIN
-66 J/kg
Mixed-layer LCL
1036 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
15 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 1, 1:57 PM CDT, 1 hour 54 minutes earlier.

Area forecast discussion, Jul 1, 1:57 PM CDT, 1 hour 54 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
257 PM EDT SUN JUL 1 2007

.SHORT TERM...(TONIGHT AND MONDAY)...
THE FRONT ACROSS THE CWA IS LOCATED JUST NORTH OF KNOXVILLE AND INTO
THE NORTHERN PLATEAU COUNTIES. PRECIP THIS EVENING WILL BE CONFINED
MAINLY ALONG AND TO THE SOUTH OF THE FRONT. GENEROUS INSTABILITY
WILL LEAD TO A THREAT OF SOME SEVERE STORMS...MAINLY PRODUCING
DAMAGING WINDS. MODELS ALSO SHOW A VORT AXIS MOVING ACROSS THE AREA
THIS EVENING...WHICH SHOULD KEEP SOME SHOWERS IN THE SOUTHERN
PORTIONS OF THE AREA PAST MIDNIGHT. IN THE NORTH...DRIER AIR HAS
MADE ITS WAY INTO THE AREA WITH DEWPOINTS DROPPING INTO THE 50S. THE
FRONT WILL GRADUALLY PUSH SOUTH OVERNIGHT...AND SHOULD BE NEAR THE
GA/AL BORDER BY MORNING. AS THE HIGH OVER THE GREAT LAKES BUILDS
DOWN OVER THE CAROLINAS AND THE TENNESSEE VALLEY...AN INVERTED LOW
LEVEL TROUGH DEVELOPS OVER THE APPALACHIANS TOMORROW. THE LIFT IN
THE NAM APPEARS WAY OVERDONE...AS IT GIVES CATEGORICAL POPS IN THE
SOUTH. WILL STAY CLOSER TO THE CHANCE POPS IN THE GFS...AND CONFINE
THEM MAINLY TO THE MOUNTAINS AND SOUTHERN VALLEY. NAM TEMPS ARE ALSO
TOO COOL...AND THE WARMER GFS MOS WILL BE PREFERRED.

.LONG TERM...(MONDAY NIGHT THROUGH SUNDAY)...
INVERTED TROUGH OVER THE APPALACHIANS WILL KEEP A FEW SHOWERS AND
THUNDERSTORMS IN THE SOUTHERN MOUNTAINS MONDAY EVENING OTHERWISE
SKIES WILL BECOME MOSTLY CLEAR AND TEMPERATURES WILL BE COOLER WITH
LOWER DEW POINTS THANKS TO HIGHER PRESSURE OVER THE OHIO VALLEY AND
NORTHEAST. TUESDAY NORTHWEST FLOW NORTH OF FRONTAL BOUNDARY WILL
KEEP MOST OF FORECAST AREA DRY. MODELS WANT TO BRING THE TAIL END
OF SHORTWAVE THATS CURRENTLY ON THE CANADIAN BORDER AND NORTHERN MN
AROUND LARGE SOUTHWEST US UPPER RIDGE INTO THE CENTRAL APPALACHIANS
LATE TUESDAY AND TUESDAY NIGHT WHICH COULD AFFECT SOUTHWEST
VIRGINIA BUT FOR NOW KEEPING IT DRY AND JUST HAVING SLIGHT CHANCE
POPS IN THE EASTERN MOUNTAINS. WEDNESDAY AS MOISTURE INCREASES WITH
MORE LOW LEVEL MOISTURE HAVE ADDED POPS TO ALL AREAS BUT STILL SEE
MOSTLY LATE AFTERNOON CONVECTION FROM HEATING. THURSDAY AND FRIDAY
A COLD FRONT MOVING AROUND UPPER RIDGE APPROACHES AND MOVES INTO
THE REGION. KEEPING THE WEEKEND DRY FOR NOW WITH FRONT JUST TO THE
SOUTH. HOWEVER THIS TIME OF YEAR FRONTS TEND TO WEAKEN AND FALL
APART SO DIURNAL POPS MAY HAVE TO BE ADDED LATER. GENERALLY
FOLLOWED THE HIGHER MINS WITH THE NAM/WRF FOR LOWS SOUTH WITH A
BLEND NORTH MONDAY NIGHT AND TUESDAY NIGHT AND THE WARMER MAV OR
SLIGHTLY HIGHER FOR HIGHS TUESDAY AND BEYOND.
&&

.PRELIMINARY POINT TEMPS/POPS...
CHATTANOOGA AIRPORT, TN  70  87  68  90  68 /  60  20  10  10  10
KNOXVILLE AIRPORT, TN    67  84  65  88  65 /  50  20  10  10  10
OAK RIDGE, TN            64  87  64  89  65 /  50  10  10  10  10
TRI CITIES AIRPORT, TN   59  83  59  85  60 /  10  10   0  10  10
&&

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

DGS/TD
Hazardous weather outlook, Jul 1, 4:24 AM CDT, 11 hours 27 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
524 AM EDT SUN JUL 1 2007

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-021000-
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-
524 AM EDT SUN JUL 1 2007 /424 AM CDT SUN JUL 1 2007/

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...MONDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

In the hours before

Local storm report, Jul 1, 12:00 PM CDT, 3 hours 51 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
100 PM EDT SUN JUL 01 2007

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

0305 PM     TSTM WND DMG     CHATTANOOGA             35.07N 85.26W
06/30/2007                   HAMILTON           TN   FIRE DEPT/RESCUE

            SECTION OF METAL ROOF OFF FIRE STATION 19 IN HIXSON AREA.
            FEW TREES DOWN ON HIXSON PIKE. CAPTIN D SIGN DOWN. DIME
            SIZE HAIL ALSO.

&&

MEP
Special weather statement, Jul 1, 2:57 PM CDT, 54 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
357 PM EDT SUN JUL 1 2007

TNZ081-098-099-012100-
HAMILTON-MARION-SEQUATCHIE-
257 PM CDT SUN JUL 1 2007

...A STRONG THUNDERSTORM WAS AFFECTING HAMILTON...MARION AND
SEQUATCHIE COUNTIES...

AT 254 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR JASPER...MOVING SOUTHEAST AT 10 MPH.

DIME SIZE HAIL...AND WINDS UP TO 40 TO 50 MPH ARE POSSIBLE WITH THIS
STORM...AND ALSO WITH OTHER ISOLATED STRONG THUNDERSTORMS OVER PARTS
OF SEQUATCHIE AND HAMILTON COUNTIES.

ANY FURTHER STRENGTHENING OF THESE STORMS MAY REQUIRE ISSUANCE OF A
WARNING.

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

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES.

TG
Local storm report, Jul 1, 3:37 PM CDT, 14 minutes before
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Special weather statement, Jul 1, 3:40 PM CDT, 11 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 3:16 PM CDTSevere Thunderstorm WarningMRXHamilton, Marion44 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2007Every severe thunderstorm warning in 2007

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.