Alert archive / Tennessee / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 124, NWS Morristown, TN

July 8, 2014Sevier County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 8, 2014, 4:33 PM EDT for Sevier County, Tennessee. It was in force for 57 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: Jul 8, 2014, 4:33 PM EDT (20:33 UTC)
Expired: Jul 8, 2014, 5:30 PM EDT
In force: 57 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

County Sevier County, TN

The radar

The Knoxville radar (KMRX), 35 km from the middle of the area, began a volume at 20:34 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
Jul 8, 4:40 PM EDT	TSTM WND DMG	1 E Seymour, TN	A FEW TREES DOWN JUST EAST OF SEYMOUR.
Jul 8, 4:40 PM EDT	HAIL 0.5	Seymour, TN	HIGH WINDS AND 1/2 INCH SIZE HAIL NEAR SEYMOUR - PORTERFILED GAP.

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 one storm report to this severe thunderstorm warning; the first came 7 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 nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 8.6 hours before the alert went out and 277 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: 582 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 1160 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -55 m²/s²
0-3 km storm-relative helicity: -14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

739 
WUUS54 KMRX 082033
SVRMRX
TNC155-082130-
/O.NEW.KMRX.SV.W.0124.140708T2033Z-140708T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
433 PM EDT TUE JUL 8 2014

THE NATIONAL WEATHER SERVICE IN MORRISTOWN  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SEVIER COUNTY IN EASTERN TENNESSEE...

* UNTIL 530 PM EDT

* AT 432 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS UP TO 60 
  MPH. THIS STORM WAS LOCATED NEAR SEYMOUR...OR 10 MILES WEST OF 
  SEVIERVILLE...AND WAS MOVING EAST AT 25 MPH.


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 3578 8374 3581 8374 3582 8376 3589 8379
      3598 8365 3599 8356 3593 8348 3593 8339
      3591 8339 3592 8336 3590 8331 3586 8329
      3574 8330
TIME...MOT...LOC 2032Z 271DEG 20KT 3588 8376 

$$

DMG

1 follow-up statement

484 
WWUS54 KMRX 082103
SVSMRX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
503 PM EDT TUE JUL 8 2014

TNC155-082130-
/O.CON.KMRX.SV.W.0124.000000T0000Z-140708T2130Z/
SEVIER TN-
503 PM EDT TUE JUL 8 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SEVIER COUNTY...

AT 503 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 
CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS UP TO 60 
MPH. THIS STORM WAS LOCATED OVER SEVIERVILLE...AND WAS MOVING EAST 
AT 25 MPH.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM.  MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES LEADING KILLERS. REMEMBER...
IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING.

&&

LAT...LON 3578 8374 3581 8374 3582 8376 3589 8379
      3598 8365 3599 8356 3593 8348 3593 8339
      3591 8339 3592 8336 3590 8331 3586 8329
      3574 8330
TIME...MOT...LOC 2103Z 271DEG 20KT 3588 8355 

$$

DMG

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 8, 2:55 PM EDT, 1 hour 38 minutes earlier.

Area forecast discussion, Jul 8, 2:55 PM EDT, 1 hour 38 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
255 PM EDT TUE JUL 8 2014

.SHORT TERM (TONIGHT AND WEDNESDAY)...FRONTAL SYSTEM STILL SAGGING
SOUTHWARD TOWARD THE AREA...AND DEEPER MOISTURE AND INSTABILITY
MOVING IN AS WELL.  LOOKING LIKE A FAIRLY WET NEXT COUPLE OF PERIODS
AS THE AXIS OF THIS SYSTEM MAKE ITS WAY INTO THE AREA. ALTHOUGH
MENTIONED "WET" ABOVE...FLOODING THREAT NOT LOOKING THAT GREAT AS
PROGRESSIVE INITIAL PARTS OF SYSTEM WILL SWEEP THROUGH...THEN AS
FRONT SAGS INTO AREA RICHER MOISTURE WILL BE SOUTH OR EAST OF THE
AREA.  SO A COUPLE OF CHANCES FOR PRECIP...THIS AFTERNOON AND THIS
EVENING WITH ADVANCING STRONG STORMS THAT MARCH ACROSS TO THE
EAST...THEN ALSO ANOTHER CHANCE TONIGHT AND WEDNESDAY AS THE MAIN
AXIS OF THE SYSTEM MOVE THROUGH THE AREA FROM THE NORTH/NORTHWEST.

DEEP CONVECTION STRUGGLING FINALLY GETTING STARTED.  MLCAPE VALUES
GETTING PRETTY HIGH...SO STILL THINK SEVERE THREAT EXISTS. ALSO
WONDERING ABOUT HOW STRONG ANY STORMS THAT DEVELOP CLOSER TO THE
FRONT MIGHT BE IF THEY MAKE THEIR WAY CLOSER TONIGHT...THINKING THE
STORMS THIS AFTERNOON ARE OUR BEST CHANCE FOR SEVERE OVERALL.

FOR TEMPERATURES KEEPING PRETTY CLOSE TO GUIDANCE FOR MINS TONIGHT
AND ON THE COOL SIDE OF MAXES FOR WEDNESDAY...CONSIDERING THE
LIMITED SUNSHINE...ESPECIALLY SOUTH.

.LONG TERM...(WEDNESDAY NIGHT THROUGH TUESDAY)...MODELS CONTINUE TO
BE IN FAIR AGREEMENT OVERALL WITH DECENT RUN TO RUN CONSISTENCY.
HOWEVER...GIVEN UNCERTAINTIES IN MODEL HANDLING OF POSSIBLE WEAK
IMPULSES IN THE NORTHWEST FLOW ALOFT FORECAST CONFIDENCE IS AT BEST
AVERAGE FOR THIS TIME OF YEAR. THE FRONT SHOULD FINALLY EXIT THE
AREA EARLY THURSDAY...BUT A WEAK IMPULSE STILL COULD HELP TO TRIGGER
SOME ISOLATED TO SCATTERED CONVECTION INTO THURSDAY AFTERNOON.
DRIER AIR SHOULD KEEP THINGS PRECIP FREE THURSDAY NIGHT THROUGH
FRIDAY NIGHT...THEN MOISTURE WILL BEGIN TO INCREASE AGAIN DURING THE
WEEKEND.  WILL CARRY SLIGHT CHANCE POPS SATURDAY AND CHANCE POPS
SUNDAY.  ANOTHER FRONTAL SYSTEM IS FORECAST TO AFFECT THE AREA EARLY
IN THE WEEK...SO CHANCE POPS BOTH MONDAY AND TUESDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
CHATTANOOGA AIRPORT, TN             71  86  68  89 /  60  60  30  30
KNOXVILLE MCGHEE TYSON AIRPORT, TN  71  83  66  87 /  60  50  20  20
OAK RIDGE, TN                       70  84  65  88 /  70  30  20  20
TRI CITIES AIRPORT, TN              68  82  61  85 /  60  30  20  20

&&

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

GM/LW

Hazardous weather outlook, Jul 8, 11:34 AM EDT, 4 hours 59 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
1134 AM EDT TUE JUL 8 2014

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-091545-
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-
1134 AM EDT TUE JUL 8 2014

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

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

SCATTERED STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE THIS
AFTERNOON AND EVENING...AHEAD OF A SLOW MOVING COLD FRONT. STORMS
ARE EXPECTED TO MOVE ACROSS THE AREA WEST TO EAST. DAMAGING WINDS
OF 60 MPH OR GREATER AND LARGE HAIL WILL BE THE MAIN THREATS WITH
THE STRONGEST STORMS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING.

In the hours before

Special weather statement, Jul 8, 4:02 PM EDT, 31 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
402 PM EDT TUE JUL 8 2014

TNZ040-041-070-073-074-082100-
COCKE SMOKY MOUNTAINS TN-NORTHWEST COCKE TN-JEFFERSON TN-
NORTH SEVIER TN-SEVIER SMOKY MOUNTAINS TN-
402 PM EDT TUE JUL 8 2014

...SIGNIFICANT WEATHER ADVISORY FOR SEVIER...COCKE...AND JEFFERSON
COUNTIES UNTIL 500 PM...

AT 400 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
NEAR NEW MARKET...OR 8 MILES NORTH OF SEVIERVILLE...WHICH WAS MOVING
EAST AT 35 MPH.

WINDS UP TO 40 MPH...SMALL HAIL...AND HEAVY RAINFALL WILL BE
POSSIBLE WITH THIS STORM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING
CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER
INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3582 8373 3594 8371 3599 8365 3603 8368
      3608 8368 3609 8366 3611 8367 3609 8364
      3611 8363 3606 8302 3579 8297 3577 8300
      3579 8308 3577 8311
TIME...MOT...LOC 2000Z 281DEG 32KT 3601 8361

DMG

Special weather statement, Jul 8, 4:16 PM EDT, 17 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
416 PM EDT TUE JUL 8 2014

TNZ016-017-042>047-082115-
WASHINGTON TN-HAWKINS TN-SULLIVAN TN-SOUTHEAST CARTER TN-
NORTHWEST CARTER TN-SOUTHEAST GREENE TN-UNICOI TN-
NORTHWEST GREENE TN-
416 PM EDT TUE JUL 8 2014

...SIGNIFICANT WEATHER ADVISORY FOR WASHINGTON...HAWKINS...
HAMBLEN...UNICOI...GREENE...CARTER AND SULLIVAN COUNTIES UNTIL 515
PM...

AT 414 PM EDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS FROM 7 MILES NORTHEAST OF SURGOINSVILLE TO 6 MILES
EAST OF RUSSELLVILLE...WHICH WAS MOVING EAST AT 40 MPH.

WINDS UP TO 40 MPH...SMALL HAIL...AND HEAVY RAINFALL WILL BE
POSSIBLE WITH THESE STORMS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STORMS. LIGHTNING
CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER
INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3601 8246 3597 8252 3600 8262 3607 8263
      3604 8271 3620 8314 3624 8308 3629 8312
      3659 8276 3659 8195
TIME...MOT...LOC 2014Z 270DEG 34KT 3654 8276 3627 8308

DMG

Special weather statement, Jul 8, 4:25 PM EDT, 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
425 PM EDT TUE JUL 8 2014

TNZ068-069-071-072-082130-
KNOX TN-BLOUNT SMOKY MOUNTAINS TN-LOUDON TN-NW BLOUNT TN-
425 PM EDT TUE JUL 8 2014

...SIGNIFICANT WEATHER ADVISORY FOR KNOX...BLOUNT...AND LOUDON
COUNTIES UNTIL 530 PM...

AT 423 PM...DOPPLER RADAR WAS TRACKING A CLUSTER OF STRONG
THUNDERSTORMS OVER KNOX...BLOUNT...AND LOUDON...WHICH WERE MOVING
EAST AT 40 MPH.

WINDS UP TO 40 MPH...SMALL HAIL...AND HEAVY RAINFALL WILL BE
POSSIBLE WITH THESE STORMS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING
CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER
INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3555 8400 3558 8414 3567 8432 3567 8435
      3564 8437 3567 8443 3568 8450 3599 8409
      3611 8369 3610 8367 3609 8371 3605 8368
      3595 8368 3589 8379 3571 8370 3556 8372
      3556 8377 3551 8389
TIME...MOT...LOC 2023Z 270DEG 34KT 3587 8382

DMG

Special weather statement, Jul 8, 4:30 PM EDT, 3 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
430 PM EDT TUE JUL 8 2014

TNZ081-084-099>101-082130-
WEST POLK-BRADLEY-SEQUATCHIE-MEIGS-HAMILTON-
430 PM EDT TUE JUL 8 2014

...A STRONG THUNDERSTORM WILL AFFECT WEST POLK...BRADLEY...
SEQUATCHIE...MEIGS...HAMILTON...

AT 430 PM EDT /330 PM CDT/...A STRONG THUNDERSTORM WAS OVER WALDEN...
OR NEAR CHATTANOOGA...MOVING EAST AT 35 MPH.

WINDS IN EXCESS OF 40 MPH AND HALF INCH HAIL ARE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
CHATTANOOGA...CLEVELAND...SODDY-DAISY...SIGNAL MOUNTAIN...WALDEN...
LAKESITE...CHARLESTON...HARRISON...EAST CLEVELAND...WILDWOOD LAKE...
FAIRMOUNT...SOUTH CLEVELAND...RED BANK...COLLEGEDALE...BIG SPRING...
NORTH CHICKAMAUGA CREEK GORGE...FALLING WATER...LONE OAK...TASSO AND
SALE CREEK.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

LAT...LON 3522 8540 3543 8506 3541 8502 3544 8498
      3547 8498 3544 8495 3544 8492 3549 8489
      3535 8486 3532 8479 3509 8466 3506 8531
TIME...MOT...LOC 2030Z 261DEG 31KT 3517 8527

JW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 2:34 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Knox	56 min
Jul 8, 4:02 PM EDT	Special Weather Statement	MRX	Cocke, Jefferson	58 min
Jul 8, 4:16 PM EDT	Special Weather Statement	MRX	Greene, Sullivan, Unicoi, Washington	59 min
Jul 8, 4:25 PM EDT	Special Weather Statement	MRX	Blount, Knox, Loudon	65 min
Jul 8, 4:30 PM EDT	Special Weather Statement	MRX	Bradley, Hamilton	60 min
Jul 8, 4:38 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Greene, Unicoi, Washington	67 min
Jul 8, 4:42 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Johnson, Sullivan	63 min
Jul 8, 4:48 PM EDT	Special Weather Statement	MRX	McMinn, Monroe	42 min
Jul 8, 4:58 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, McMinn, Monroe, Polk	62 min
Jul 8, 5:11 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Sevier	49 min
Jul 8, 5:59 PM EDT	Severe Thunderstorm Warning	MRX	Monroe, Polk	34 min
Jul 8, 7:15 PM EDT	Special Weather Statement	MRX	Sequatchie	45 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.