Alert archive / Tennessee / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 178, NWS Morristown, TN

August 20, 20145 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Aug 20, 2014, 7:19 PM EDT for 5 counties in Tennessee. It was in force for 56 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 20, 2014, 7:19 PM EDT (23:19 UTC)
Expired: Aug 20, 2014, 8:15 PM EDT
In force: 56 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Anderson County, TN, Campbell County, TN, Grainger County, TN, Scott County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 55 km from the middle of the area, began a volume at 23:22 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.

What was reported inside it

Time	Report	Where	Remark
Aug 20, 7:25 PM EDT	TSTM WND DMG	La Follette, TN	A FEW TREES DOWN.
Aug 20, 7:30 PM EDT	TSTM WND DMG	Sharps Chapel, TN	DISPATCH REPORTED A FEW TREES DOWNED IN THE COUNTY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this severe thunderstorm warning; the first came 6 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 20, 3:59 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 11.3 hours before the alert went out and 233 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: 3056 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 822 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: -8 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

773 
WUUS54 KMRX 202319
SVRMRX
TNC001-013-057-151-173-210015-
/O.NEW.KMRX.SV.W.0178.140820T2319Z-140821T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
719 PM EDT WED AUG 20 2014

THE NATIONAL WEATHER SERVICE IN MORRISTOWN  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CAMPBELL COUNTY IN EASTERN TENNESSEE...
  WEST CENTRAL GRAINGER COUNTY IN EASTERN TENNESSEE...
  UNION COUNTY IN EASTERN TENNESSEE...
  SOUTHERN SCOTT COUNTY IN EASTERN TENNESSEE...
  ANDERSON COUNTY IN EASTERN TENNESSEE...

* UNTIL 815 PM EDT

* AT 718 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
  THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING
  WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM 13 MILES NORTHEAST OF LA FOLLETTE TO NEAR
  HUNTSVILLE...AND MOVING SOUTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CLINTON...LA FOLLETTE...MAYNARDVILLE...OLIVER SPRINGS...
  PLAINVIEW...JACKSBORO...CARYVILLE...LAKE CITY...NORRIS...
  LUTTRELL...FINCASTLE...ELGIN...DISNEY...ROYAL BLUE...SMOKEY
  JUNCTION...PAULETTE...ROSEDALE...ROSE HILL...SLICK ROCK AND NORMA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

&&

LAT...LON 3643 8392 3642 8383 3643 8380 3634 8373
      3636 8370 3635 8367 3628 8369 3622 8364
      3620 8372 3617 8373 3616 8391 3619 8395
      3613 8402 3605 8434 3614 8445 3616 8444
      3620 8447 3623 8455 3635 8467 3652 8397
TIME...MOT...LOC 2318Z 296DEG 22KT 3648 8392 3634 8450 

$$

TG

1 follow-up statement

140 
WWUS54 KMRX 202347
SVSMRX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
747 PM EDT WED AUG 20 2014

TNC001-013-057-151-173-210015-
/O.CON.KMRX.SV.W.0178.000000T0000Z-140821T0015Z/
CAMPBELL TN-GRAINGER TN-UNION TN-SCOTT TN-ANDERSON TN-
747 PM EDT WED AUG 20 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR SOUTHERN CAMPBELL...WEST CENTRAL GRAINGER...UNION...SOUTHEASTERN
SCOTT AND ANDERSON COUNTIES...

AT 746 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM NEAR
MAYNARDVILLE TO 12 MILES WEST OF PLAINVIEW TO NEAR CLINTON...MOVING 
SOUTHEAST AT 35 MPH. DIME TO PENNY SIZE HAIL MAY ALSO ACCOMPANY THE 
DAMAGING WINDS.

LOCATIONS IMPACTED INCLUDE...
CLINTON...MAYNARDVILLE...OLIVER SPRINGS...PLAINVIEW...JACKSBORO...
CARYVILLE...LAKE CITY...NORRIS...LUTTRELL...DISNEY...PAULETTE...
ROSEDALE...ROSE HILL...SHARPS CHAPEL AND NORRIS LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

&&

LAT...LON 3638 8393 3642 8383 3643 8380 3634 8373
      3636 8370 3635 8367 3628 8369 3622 8364
      3620 8372 3617 8373 3616 8391 3619 8395
      3613 8402 3605 8434 3614 8445 3616 8444
      3620 8447 3623 8455 3624 8453 3635 8411
TIME...MOT...LOC 2346Z 308DEG 29KT 3631 8376 3620 8402 3614 8420 

$$

TG

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 20, 4:20 PM EDT, 2 hours 59 minutes earlier.

Area forecast discussion, Aug 20, 4:20 PM EDT, 2 hours 59 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
420 PM EDT WED AUG 20 2014

.DISCUSSION...UPDATED FOR SEVERE THUNDERSTORM WATCH. INCREASED
RAIN CHANCES THROUGH MID EVENING OVER WESTERN PARTS OF THE FORECAST
AREA AS STRONG TO SEVERE STORMS HAVE INCREASED LATE THIS AFTERNOON.

&&

.PRELIMINARY POINT TEMPS/POPS...
CHATTANOOGA AIRPORT, TN             72  94  72  95 /  50  20  10  10
KNOXVILLE MCGHEE TYSON AIRPORT, TN  71  91  71  92 /  60  30  10  20
OAK RIDGE, TN                       71  91  71  92 /  60  30  10  20
TRI CITIES AIRPORT, TN              66  87  66  88 /  40  50  30  40

&&

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

TD

Hazardous weather outlook, Aug 20, 3:30 AM EDT, 15 hours 49 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
330 AM EDT WED AUG 20 2014

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-210730-
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-
330 AM EDT WED AUG 20 2014

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

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

ISOLATED TO SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP MAINLY
DURING THE HEAT OF THE AFTERNOON...DRIFTING SLOWLY SOUTHEAST AT 10
TO 15 MPH. THE THUNDERSTORMS SHOULD DISSIPATE BEFORE MIDNIGHT...AND
ONLY A STRAY STRONG STORM IS POSSIBLE.

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

AN ACTIVE WEATHER PATTERN IS EXPECTED TO LINGER OVER THE REGION.
UPPER LEVEL DISTURBANCES ORIGINATING AROUND THE GREAT LAKES ARE
EXPECTED TO TRACK SOUTHEAST...AND BRING THE POSSIBILITY OF STRONG
STORMS TO PORTIONS OF THE AREA...MAINLY SOUTHWESTERN VIRGINIA AND
NORTHEAST TENNESSEE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME...DUE TO THE
ISOLATED NATURE OF THE POSSIBLE THREATS.

In the hours before

Local storm report, Aug 20, 6:46 PM EDT, 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
646 PM EDT WED AUG 20 2014

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

0606 PM     TSTM WND DMG     PARKSVILLE              35.10N 84.65W
08/20/2014                   POLK               TN   911 CALL CENTER

            SEVERAL TREES DOWN IN AND NEAR PARKSVILLE.

&&

Local storm report, Aug 20, 6:56 PM EDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
656 PM EDT WED AUG 20 2014

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

0625 PM     TSTM WND DMG     CLEVELAND               35.07N 82.53W
08/20/2014                   GREENVILLE         SC   911 CALL CENTER

            LOTS OF TREES DOWN COUNTY-WIDE.

&&

Local storm report, Aug 20, 7:05 PM EDT, 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
705 PM EDT WED AUG 20 2014

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

0430 PM     TSTM WND DMG     SWEETWATER              35.60N 84.47W
08/20/2014                   MONROE             TN   911 CALL CENTER

            TREES DOWN IN SWEETWATER.

&&

Local storm report, Aug 20, 7:08 PM EDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
708 PM EDT WED AUG 20 2014

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

0510 PM     TSTM WND DMG     2 S MADISONVILLE        35.49N 84.36W
08/20/2014                   MONROE             TN   911 CALL CENTER

            TREES DOWN SOUTH OF MADISONVILLE.

&&

Local storm report, Aug 20, 7:13 PM EDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
713 PM EDT WED AUG 20 2014

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

0540 PM     TSTM WND DMG     5 S MADISONVILLE        35.45N 84.36W
08/20/2014                   MONROE             TN   911 CALL CENTER

            TREES DOWN NEAR THE MONROE-POLK COUNTY LINE.

&&

Local storm report, Aug 20, 7:15 PM EDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
715 PM EDT WED AUG 20 2014

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

0550 PM     TSTM WND DMG     RICEVILLE               35.38N 84.70W
08/20/2014                   MCMINN             TN   911 CALL CENTER

            TREES DOWN NEAR RICEVILLE.

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 1:33 PM EDT	Special Weather Statement	MRX	Roane	42 min
Aug 20, 1:48 PM EDT	Severe Thunderstorm Warning	MRX	Loudon, Roane	42 min
Aug 20, 2:13 PM EDT	Special Weather Statement	MRX	Anderson	47 min
Aug 20, 2:27 PM EDT	Severe Thunderstorm Warning	MRX	Loudon, McMinn, Monroe, Morgan, Roane	48 min
Aug 20, 2:56 PM EDT	Special Weather Statement	MRX	Knox	49 min
Aug 20, 3:02 PM EDT	Tornado Warning	MRX	Loudon, McMinn, Monroe	43 min
Aug 20, 3:31 PM EDT	Tornado Warning	MRX	McMinn, Monroe	44 min
Aug 20, 3:48 PM EDT	Special Weather Statement	MRX	Grainger, Hamblen, Jefferson	42 min
Aug 20, 3:56 PM EDT	Severe Thunderstorm Warning	MRX	McMinn, Monroe, Polk	49 min
Aug 20, 4:03 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Knox	42 min
Aug 20, 4:09 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene, Jefferson	37 min
Aug 20, 4:14 PM EDT	Severe Thunderstorm Warning	MRX	Loudon, McMinn, Meigs, Monroe, Roane	46 min
Aug 20, 4:16 PM EDT	Special Weather Statement	MRX	Greene	29 min
Aug 20, 4:26 PM EDT	Severe Thunderstorm Warning	MRX	Greene	18 min
Aug 20, 4:28 PM EDT	Severe Thunderstorm Warning	MRX	Hancock, Hawkins	47 min
Aug 20, 4:34 PM EDT	Special Weather Statement	MRX	Marion	41 min
Aug 20, 4:37 PM EDT	Severe Thunderstorm Warning	MRX	McMinn, Meigs	38 min
Aug 20, 4:41 PM EDT	Severe Thunderstorm Warning	MRX	Polk	34 min
Aug 20, 4:42 PM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Hamilton, Rhea	33 min
Aug 20, 4:43 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Unicoi, Washington	62 min
Aug 20, 4:52 PM EDT	Tornado Warning	MRX	Bradley, McMinn, Polk	38 min
Aug 20, 4:55 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Monroe	50 min
Aug 20, 4:59 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Grainger	46 min
Aug 20, 5:11 PM EDT	Special Weather Statement	MRX	Hawkins	49 min
Aug 20, 5:16 PM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Bradley, Hamilton, McMinn, Marion, Meigs and 2 more	59 min
Aug 20, 5:19 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, McMinn, Meigs, Rhea	26 min
Aug 20, 5:22 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Monroe, Polk	38 min
Aug 20, 5:25 PM EDT	Severe Thunderstorm Warning	MRX	Knox, Union	50 min
Aug 20, 5:42 PM EDT	Areal Flood Advisory	MRX	McMinn	2 hr
Aug 20, 5:44 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Meigs, Polk	46 min
Aug 20, 5:56 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Knox, Sevier	34 min
Aug 20, 5:58 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Monroe, Polk	33 min
Aug 20, 6:08 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton	24 min
Aug 20, 6:17 PM EDT	Special Weather Statement	MRX	Marion	28 min
Aug 20, 6:41 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Scott	49 min
Aug 20, 7:04 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Grainger, Hancock, Union	41 min
Aug 20, 7:40 PM EDT	Areal Flood Advisory	MRX	Anderson, Campbell	3 hr
Aug 20, 7:41 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Grainger, Hamblen, Jefferson, Knox, Union	49 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2014 Every severe thunderstorm warning in 2014

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.