Alert archive / Tennessee / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 148, NWS Morristown, TN

July 25, 2007Monroe County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 25, 2007, 5:19 PM EDT for Monroe County, Tennessee. It was in force for 56 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 25, 2007, 5:19 PM EDT (21:19 UTC)
Expired: Jul 25, 2007, 6:15 PM EDT
In force: 56 min
Issued by: NWS Morristown, TN
Area: Counties, with a storm outline in the text

County Monroe County, TN

The radar

The Knoxville radar (KMRX), 111 km from the middle of the area, began a volume at 21:21 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 12:00Z, 9.3 hours before the alert went out and 225 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1612 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 686 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 95 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 25, 3:18 PM EDT, 2 hours 1 minute earlier.

Area forecast discussion, Jul 25, 3:18 PM EDT, 2 hours 1 minute before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
318 PM EDT WED JUL 25 2007

.SHORT TERM...(TONIGHT THROUGH FRIDAY)...UPPER LOW TO OUR NORTH...
SURFACE TROUGH FROM SRN MIDDLE TN INTO NE TN...AND A FEW BREAKS OF
SUNSHINE...HAVE CAUSED WIDESPREAD SHOWERS AND THUNDERSTORMS TO
DEVELOP THIS AFTERNOON. A FEW STORMS HAVE PULSED JUST UP TO SEVERE
LEVELS...WITH VERY HEAVY RAINFALL ALSO NOTED IN A FEW COUNTIES
(SCOTT/CAMPBELL TN). MAX TEMPS GENERALLY HELD DOWN THIS AFTERNOON
DUE TO CLOUDS AND RAIN.

POP AND WEATHER GRIDS ADJUSTED TO CURRENT RADARS AND A SHORT TERM
FORECAST INTO THIS EVENING. OTHERWISE...KEPT AT LEAST SOME CHANCE
POPS ALL AREAS OVERNIGHT. FAVORED A BLEND OF MOS FOR MINS TONIGHT.

ON THURSDAY...UPPER LOW IS STILL VERY MUCH NEARBY AND UNSTABLE AGAIN
...SO FAVORED GOING WITH LOWER END OF LIKELY MOST AREAS ON POPS BY
THE AFTERNOON HOURS. WENT CLOSER TO MOS POPS AND MAX TEMPS ACROSS
SRN MOST AREAS...WHICH ARE FURTHER AWAY FROM THE UPPER LOW.

FOR THURSDAY NIGHT AND FRIDAY...CONVECTION SHOULD BE MORE DIURNAL
IN NATURE...BUT CANT RULE OUT ISOLATED CONVECTION JUST ABOUT
ANYTIME. PREVIOUS POP AND WEATHER GRIDS WERE REASONABLE WITH
SLIGHT ADJUSTMENTS. AGAIN...FAVORED WARMER MOS MAX TEMPS FOR SRN
AREAS...AND A MOS BLEND FOR MIN TEMPS.

.LONG TERM...(FRIDAY NIGHT THROUGH WEDNESDAY)...MODELS BRING FRONT
INTO AREA FRIDAY NIGHT AND SATURDAY.  WILL KEEP CHANCE POPS FOR BOTH
PERIODS WITH THE BEST CHANCES IN THE NORTH WHERE THE BEST MOISTURE
AND LIFT IS EXPECTED.  UPPER LOW LINGERS ON SUNDAY.  WILL KEEP
CHANCE POPS GOING FOR SUNDAY WITH THE BEST CHANCES IN OUR EASTERN
ZONES.  UPPER LOW STILL LINGERING TO THE EAST ON MONDAY THROUGH
WEDNESDAY...WILL KEEP ONLY LOW POPS FOR THE MOUNTAINS WHERE THE BEST
MOISTURE IS AVAILABLE.   STAYED NEAR MOS/HPC FOR TEMPERATURES.

&&

.PRELIMINARY POINT TEMPS/POPS...
CHATTANOOGA AIRPORT, TN             69  86  69  90  69 /  30  50  40  40  30
KNOXVILLE MCGHEE TYSON AIRPORT, TN  66  84  67  87  67 /  40  60  40  40  30
OAK RIDGE, TN                       66  85  66  88  67 /  40  60  40  40  30
TRI CITIES AIRPORT, TN              62  81  63  84  63 /  50  60  40  50  30

&&

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

TG/GH

Hazardous weather outlook, Jul 25, 7:00 AM EDT, 10 hours 19 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
700 AM EDT WED JUL 25 2007

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-261000-
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-
700 AM EDT WED JUL 25 2007 /600 AM CDT WED JUL 25 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.

WIDESPREAD SHOWERS AND SCATTERED THUNDERSTORMS ARE EXPECTED.
SMALL HAIL IS POSSIBLE MAINLY NORTH OF I-40.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER NETWORK ACTIVATION WILL NOT BE NEEDED.

In the hours before

Local storm report, Jul 25, 3:37 PM EDT, 1 hour 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
337 PM EDT WED JUL 25 2007

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

0330 PM     TSTM WND DMG     DANDRIDGE               36.02N 83.42W
07/25/2007                   JEFFERSON          TN   LAW ENFORCEMENT

            FEW TREES AND POWER LINES DOWN IN THE DANDRIDGE AREA.
            REPORTED BY SHERIFFS OFFICE.

&&

MEP

Local storm report, Jul 25, 3:52 PM EDT, 1 hour 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
352 PM EDT WED JUL 25 2007

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

0319 PM     HAIL             PIKEVILLE               35.61N 85.20W
07/25/2007  E1.00 INCH       BLEDSOE            TN   LAW ENFORCEMENT

            QUARTER SIZE HAIL ON DAYTON MOUNTAIN. REPORTED BY
            SHERIFFS OFFICE.

&&

MEP

Local storm report, Jul 25, 4:02 PM EDT, 1 hour 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
402 PM EDT WED JUL 25 2007

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

0355 PM     HAIL             NEWPORT                 35.96N 83.19W
07/25/2007  E0.75 INCH       COCKE              TN   AMATEUR RADIO

            PENNY SIZE HAIL ON HWY 25/70 IN NEWPORT. REPORTED BY
            SPOTTER.

&&

MEP

Local storm report, Jul 25, 4:27 PM EDT, 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
427 PM EDT WED JUL 25 2007

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

0305 PM     TSTM WND DMG     SPRING CITY             35.69N 84.86W
07/25/2007                   RHEA               TN   LAW ENFORCEMENT

            FEW TREES DOWN ACROSS NORTH HALF OF COUNTY. REPORTED BY
            SHERIFFS OFFICE.

0400 PM     TSTM WND DMG     DAYTON                  35.49N 85.01W
07/25/2007                   RHEA               TN   LAW ENFORCEMENT

            TREES DOWN ACROSS SOUTH HALF OF COUNTY. REPORTED BY
            SHERIFFS OFFICE.

0403 PM     TSTM WND DMG     PIKEVILLE               35.61N 85.20W
07/25/2007                   BLEDSOE            TN   LAW ENFORCEMENT

            FEW TREES DOWN IN THE NINE MILE AREA. REPORTED BY
            SHERIFFS OFFICE.

&&

MEP

Local storm report, Jul 25, 5:13 PM EDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
513 PM EDT WED JUL 25 2007

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

0328 PM     TSTM WND GST     DANDRIDGE               36.02N 83.42W
07/25/2007  M63 MPH          JEFFERSON          TN   AMATEUR RADIO

            SPOTTER REPORTS 3 TREES DOWN, PENNY SIZE HAIL, AND
            MEASURED WIND SPEED OF 63 MPH, AT HIS HOME ON CHEROKEE
            DRIVE.

&&

MEP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 2:32 PM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Rhea	43 min
Jul 25, 3:00 PM EDT	Severe Thunderstorm Warning	MRX	Jefferson	60 min
Jul 25, 3:28 PM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Hamilton, Rhea	62 min
Jul 25, 3:37 PM EDT	Severe Thunderstorm Warning	MRX	Cocke	53 min
Jul 25, 3:51 PM EDT	Severe Thunderstorm Warning	MRX	Sequatchie	54 min
Jul 25, 4:31 PM EDT	Severe Thunderstorm Warning	MRX	Hamilton	59 min
Jul 25, 4:45 PM EDT	Severe Thunderstorm Warning	MRX	Marion	60 min
Jul 25, 4:48 PM EDT	Severe Thunderstorm Warning	MRX	Bradley	57 min
Jul 25, 6:22 PM EDT	Severe Thunderstorm Warning	MRX	Polk	53 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2007 Every 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.