Alert archive / Tennessee / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 167, NWS Morristown, TN

August 10, 20156 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Aug 10, 2015, 5:39 PM EDT for 6 counties in Tennessee. It was in force for 38 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: Aug 10, 2015, 5:39 PM EDT (21:39 UTC)
Expired: Aug 10, 2015, 6:17 PM EDT
In force: 38 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cocke County, TN, Grainger County, TN, Hamblen County, TN, Jefferson County, TN, Knox County, TN, Sevier County, TN

The radar

The Knoxville radar (KMRX), 15 km from the middle of the area, began a volume at 21:42 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, 9.7 hours before the alert went out and 312 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: 374 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 1079 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 98 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 Aug 10, 2:58 PM EDT, 2 hours 41 minutes earlier.

Area forecast discussion, Aug 10, 2:58 PM EDT, 2 hours 41 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
258 PM EDT MON AUG 10 2015

.SHORT TERM...(TONIGHT AND TOMORROW)...APPROACHING COLD FRONT WILL
ALLOW FOR PRE-FRONTAL SCATTERED CONVECTION TO CONTINUE TONIGHT AND
LINGER INTO EARLY TUESDAY MORNING. THE BEST COVERAGE AND CHANCES FOR
STRONGER STORMS LOOKS TO OCCUR THIS AFTERNOON ACROSS THE SOUTHERN
VALLEY AND INTO SWNC...WHERE THE AIRMASS IS MORE UNSTABLE. THE BULK
OF THE CONVECTION SHOULD BE OUT OF THE AREA BY THIS EVENING. THEN
ANOTHER WEAK WAVE IN THE TROUGH MOVES IN OVER NIGHT BUT WITH ONLY
ISO/SCT COVERAGE EXPECTED. COLD FRONT MOVES THROUGH OVERNIGHT/EARLY
MORNING BUT CLEARING IS SLOW ON TUESDAY. DO EXPECT CLEARING TO BEGIN
MID TO LATE AFTERNOON FIRST ACROSS THE PLATEAU AND THEN CONTINUE
EASTWARD THROUGH THE REST OF THE DAY. OVERNIGHT LOWS WILL BE MILD DUE
TO CLOUD COVER AND HIGHS WILL BE CLOSE TO NORMAL FOR TOMORROW.

.LONG TERM...(TUESDAY NIGHT THROUGH MONDAY)... SURFACE HIGH PRESSURE
OVER THE NORTHERN PLAINS WILL BE BUILDING OVER THE TN VALLEY REGION
TO START THE PERIOD...WITH A DRY NORTHWEST FLOW ALOFT. THIS PATTERN
WILL PERSIST THROUGH THURSDAY AS THE HIGH SETTLES OVER THE OHIO
VALLEY. THE RESULT IN SENSIBLE WEATHER WILL BE MOSTLY CLEAR/SUNNY
SKIES...COMFORTABLE HUMIDITY LEVELS...AND TEMPERATURES A LITTLE
BELOW NORMAL. HIGHS WILL BE IN THE UPPER 70S TO MID 80S WITH LOWS IN
THE UPPER 50S TO MID 60S.

THE PATTERN CHANGES ON FRIDAY AS AN UPPER LOW DROPS INTO ONTARIO
AND DRAGS A SHORTWAVE TROUGH AND SURFACE FRONT INTO THE OHIO
VALLEY. THIS SHOULD BRING A RETURN OF POPS INTO THE FORECAST...BUT
ONLY A SLIGHT CHANCE AS MOISTURE REMAINS LIMITED. MOST CONVECTIVE
ACTIVITY WILL BE IN THE HIGHER ELEVATIONS AND DIURNALLY-BASED ON
FRIDAY...WITH SOME ACTIVITY POSSIBLE IN THE VALLEY SATURDAY AND
SUNDAY FORCING PICKS UP A LITTLE AS THE FRONT MOVES CLOSER AND WE
WILL HAVE A BROAD TROUGH ALOFT ACROSS THE APPALACHIANS. THE GFS AND
ECMWF BOTH SHOW THE SOUTHERN END OF THE TROUGH EVOLVING INTO A
CLOSED LOW IN THE NW GULF ON MONDAY. THIS MAY BRING SOME BETTER
MOISTURE ADVECTION INTO THE AREA...SO WILL START MONDAY WITH A
SLIGHT CHANCE POP.

&&

.PRELIMINARY POINT TEMPS/POPS...
CHATTANOOGA AIRPORT, TN             73  89  67  86 /  50  30  20  10
KNOXVILLE MCGHEE TYSON AIRPORT, TN  70  87  67  83 /  60  30  10  10
OAK RIDGE, TN                       71  87  65  83 /  60  30  10  10
TRI CITIES AIRPORT, TN              67  83  62  81 /  60  30  20  10

&&

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

SR/DGS

Hazardous weather outlook, Aug 10, 3:03 PM EDT, 2 hours 36 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
303 PM EDT MON AUG 10 2015

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-111915-
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-
303 PM EDT MON AUG 10 2015 /203 PM CDT MON AUG 10 2015/

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

.DAY ONE...THIS AFTERNOON AND TONIGHT...

SCATTERED CONVECTION WILL CONTINUE THIS AFTERNOON AND INTO THE
EVENING HOURS AHEAD OF AN APPROACHING COLD FRONT. A FEW STORMS MAY
BECOME STRONG AND POSSIBLY SEVERE WITH HIGH WINDS AND LOCALLY HEAVY
RAINFALL BEING THE MAIN THREATS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.

In the hours before

Special weather statement, Aug 10, 3:58 PM EDT, 1 hour 41 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
358 PM EDT MON AUG 10 2015

TNZ067-068-083>086-102045-
RHEA TN-ROANE TN-MEIGS TN-LOUDON TN-NORTHWEST MONROE TN-MCMINN TN-
358 PM EDT MON AUG 10 2015

SIGNIFICANT WEATHER ADVISORY FOR RHEA...ROANE...MEIGS...LOUDON...
NORTHWEST MONROE...AND MCMINN COUNTIES UNTIL 445 PM EDT...

AT 357 PM EDT...DOPPLER RADAR WAS TRACKING A FEW CLUSTERS OF STRONG
THUNDERSTORM 7 MILES NORTHEAST OF DECATUR...MOVING EAST AT 30 MPH.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
OAK RIDGE...ATHENS...LENOIR CITY...SWEETWATER...LOUDON...
MADISONVILLE...DECATUR...SPRING CITY...FAIRVIEW...VONORE...
GREENBACK...FRIENDSVILLE...NIOTA...PHILADELPHIA...TARIFFVILLE...
PEAKLAND...CITICO BEACH...PAINT ROCK...CLEAR WATER AND MURRAY STORE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3545 8480 3570 8488 3590 8427 3582 8418
      3578 8417 3576 8417 3575 8416 3571 8417
      3565 8413 3561 8419 3558 8413 3558 8412
      3549 8409
TIME...MOT...LOC 1957Z 258DEG 24KT 3557 8468

AMP.23

Local storm report, Aug 10, 4:26 PM EDT, 1 hour 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
426 PM EDT MON AUG 10 2015

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

0422 PM     TSTM WND DMG     TELLICO PLAINS          35.37N 84.30W
08/10/2015                   MONROE             TN   911 CALL CENTER

            COUPLE TREES DOWN IN TELLICO PLAINS.

&&

DH

Local storm report, Aug 10, 4:48 PM EDT, 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
448 PM EDT MON AUG 10 2015

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

0435 PM     TSTM WND DMG     LOUDON                  35.74N 84.36W
08/10/2015                   LOUDON             TN   PUBLIC

            SEVERAL TREES DOWN NEAR LOUDON, TN.

&&

DH

Local storm report, Aug 10, 5:13 PM EDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
513 PM EDT MON AUG 10 2015

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

0505 PM     TSTM WND DMG     WALLAND                 35.73N 83.82W
08/10/2015                   BLOUNT             TN   PUBLIC

            SEVERAL TREES DOWN BETWEEN HAPPY VALLEY AND WALLAND.

&&

DH

Special weather statement, Aug 10, 5:20 PM EDT, 19 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Aug 10, 5:32 PM EDT, 7 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 2:40 PM EDT	Special Weather Statement	MRX	Hamilton, Marion	35 min
Aug 10, 3:01 PM EDT	Special Weather Statement	MRX	Rhea	44 min
Aug 10, 3:13 PM EDT	Special Weather Statement	MRX	Bradley	47 min
Aug 10, 3:39 PM EDT	Special Weather Statement	MRX	Monroe	51 min
Aug 10, 3:58 PM EDT	Special Weather Statement	MRX	Loudon, Meigs	47 min
Aug 10, 4:08 PM EDT	Severe Thunderstorm Warning	MRX	Monroe	37 min
Aug 10, 4:12 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Knox, Loudon, Monroe, Roane	48 min
Aug 10, 4:45 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Sevier	30 min
Aug 10, 5:02 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Knox, Sevier	43 min
Aug 10, 5:14 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Sevier	31 min
Aug 10, 5:20 PM EDT	Special Weather Statement	MRX	Hancock, Hawkins	40 min
Aug 10, 6:18 PM EDT	Special Weather Statement	MRX	Greene, Hamblen, Jefferson	42 min
Aug 10, 6:54 PM EDT	Special Weather Statement	MRX	Greene, Unicoi	51 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2015 Every severe thunderstorm warning in 2015

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.