Alert archive / Tennessee / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 13, NWS Morristown, TN

April 19, 20154 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Apr 19, 2015, 8:50 PM EDT for 4 counties in Tennessee. It was in force for 25 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: Apr 19, 2015, 8:50 PM EDT (00:50 UTC)
Expired: Apr 19, 2015, 9:15 PM EDT
In force: 25 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Anderson County, TN, Blount County, TN, Knox County, TN, Sevier County, TN

The radar

The Knoxville radar (KMRX), 76 km from the middle of the area, began a volume at 00:50 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
Apr 19, 8:58 PM EDT	TSTM WND DMG	Maryville, TN	SEVERAL TREES AND A FEW POWER LINES DOWN ACROSS BLOUNT COUNTY.
Apr 19, 9:06 PM EDT	TSTM WND DMG	Knoxville, TN	MULTIPLE TREES AND A FEW POWER LINES DOWN ACROSS KNOX 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 8 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 00:00Z, 0.8 hours before the alert went out and 243 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: 170 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 927 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 67 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

463 
WUUS54 KMRX 200050
SVRMRX
TNC001-009-093-155-200115-
/O.NEW.KMRX.SV.W.0013.150420T0050Z-150420T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
850 PM EDT SUN APR 19 2015

THE NATIONAL WEATHER SERVICE IN MORRISTOWN  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN SEVIER COUNTY IN EASTERN TENNESSEE...
  KNOX COUNTY IN EASTERN TENNESSEE...
  BLOUNT COUNTY IN EASTERN TENNESSEE...
  CENTRAL ANDERSON COUNTY IN EASTERN TENNESSEE...

* UNTIL 915 PM EDT

* AT 849 PM EDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE 
  EXTENDING FROM NEAR CLINTON TO 10 MILES SOUTH OF HAPPY 
  VALLEY... MOVING EAST AT 35 MPH.

  HAZARD...60 MPH WIND GUSTS AND PENNY SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  KNOXVILLE...OAK RIDGE...MARYVILLE...CLINTON...ALCOA...FARRAGUT...
  LOUISVILLE...ROCKFORD...EAGLETON VILLAGE...HALLS...FRIENDSVILLE...
  TOWNSEND...WILDWOOD...WALLAND...SEYMOUR...LAKE FOREST...HAPPY
  VALLEY...CLOVER HILL...KARNS AND BEARDEN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3546 8396 3549 8394 3550 8398 3551 8401
      3553 8399 3555 8400 3555 8406 3620 8427
      3618 8424 3620 8423 3604 8375 3557 8362
      3556 8377 3552 8383 3552 8388 3547 8392
      3546 8395
TIME...MOT...LOC 0049Z 265DEG 29KT 3612 8418 3544 8395 

HAIL...0.75IN
WIND...60MPH

$$

17

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 Apr 19, 7:29 PM EDT, 1 hour 21 minutes earlier.

Area forecast discussion, Apr 19, 7:29 PM EDT, 1 hour 21 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE MORRISTOWN TN
729 PM EDT SUN APR 19 2015

.AVIATION...
A SECONDARY LINE OF SHOWERS/STORMS WILL BE THROUGH THE REGION THIS
EVENING...BRINGING LOCALLY GUSTY WINDS AND BRIEF LOWERING CIG/VIS
TO MVFR TO IFR LEVELS. AFTER A LULL TONIGHT...ANOTHER ROUND OF
SHRA/TSRA IS EXPECTED TO DEVELOP TO THE WEST AND MOVE IN LATE
TONIGHT...BEFORE TAPERING OFF FROM WEST TO EAST BY THE MID-
MORNING. HOWEVER SOME ISOLATED TO SCATTERED VCSH WILL BE POSSIBLE
AT KTYS/KTRI DURING THE AFTERNOON AS WELL BEFORE THE FRONT FINALLY
CLEARS THE REGION...SO HAVE MAINTAINED A MENTION OF THIS AS WELL.

&&

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

AMP

Hazardous weather outlook, Apr 19, 4:04 PM EDT, 4 hours 46 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE MORRISTOWN TN
404 PM EDT SUN APR 19 2015

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-202015-
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-
404 PM EDT SUN APR 19 2015

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

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

...LOCALLY HEAVY RAINFALL...AND A RISK OF STRONG TO SEVERE
THUNDERSTORMS POSSIBLE THIS EVENING AND OVERNIGHT...

PERIODS OF MODERATE TO HEAVY RAINS ARE ANTICIPATED ALONG AND BEHIND A
WARM FRONT THAT IS MOVING NORTHEAST THROUGH THE REGION. DUE TO THE
VERY MOIST ENVIRONMENT IN PLACE...LOCALLY HEAVY RAINFALL IS
POSSIBLE. THE HEAVY RAINS MAY CAUSE LOCALIZED FLASH FLOODING OF
AREA ROADWAYS...SMALL STREAMS...AND PONDING OF WATER ACROSS LOW-
LYING AREAS.

THE THREAT OF THUNDERSTORMS WILL INCREASE THIS EVENING AND
OVERNIGHT AS A WEAK COLD FRONT TRACKS TOWARD THE REGION. LOCALLY
STRONG TO SEVERE STORMS ARE POSSIBLE...WITH THE MAIN THREATS EXPECTED
TO BE ISOLATED DAMAGING DOWNBURSTS WINDS AND HAIL UP TO QUARTER
SIZE.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY...

THE THREAT FOR SHOWERS AND THUNDERSTORMS CONTINUES INTO MONDAY.
THE CHANCE OF SEVERE STORMS REMAINS LOW...BUT STRONG STORMS AND AN
ISOLATED SEVERE ARE POSSIBLE MONDAY AFTERNOON AND EVENING...WITH
THE HIGHEST CHANCES BEING IN FAR NORTHEAST TENNESSEE INTO
SOUTHWEST VIRGINIA. DAMAGING WINDS...LOCALLY HEAVY RAIN...AND
QUARTER SIZED HAIL COULD OCCUR WITH THE STRONGEST STORMS.

.SPOTTER INFORMATION STATEMENT...

LOCALIZED SPOTTER ACTIVATION MAY BE REQUESTED FOR SUNDAY AND MONDAY
AFTERNOON AND EVENING.

In the hours before

Special weather statement, Apr 19, 6:29 PM EDT, 2 hours 21 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
529 PM CDT SUN APR 19 2015

TNZ098-192315-
MARION TN-
529 PM CDT SUN APR 19 2015

...SIGNIFICANT WEATHER ADVISORY FOR MARION COUNTY UNTIL 615 PM CDT...

AT 528 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
NEAR SOUTH PITTSBURG...OR 8 MILES WEST OF JASPER...MOVING NORTHEAST
AT 35 MPH.

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

LOCATIONS IMPACTED INCLUDE...
JASPER...SOUTH PITTSBURG...WHITWELL...KIMBALL...MONTEAGLE...POWELLS
CROSSROADS...ORME...MARTIN SPRINGS...HALETOWN (GUILD) AND GRIFFITH
CREEK.

LAT...LON 3519 8587 3524 8585 3522 8574 3524 8569
      3529 8571 3532 8556 3530 8555 3527 8549
      3527 8545 3522 8540 3511 8539 3509 8536
      3505 8538 3504 8541 3501 8543 3498 8548
      3499 8586
TIME...MOT...LOC 2228Z 231DEG 47KT 3506 8579

17

Special weather statement, Apr 19, 7:04 PM EDT, 1 hour 46 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
704 PM EDT SUN APR 19 2015

TNZ081-082-098-099-192330-
MARION TN-BLEDSOE TN-SEQUATCHIE TN-HAMILTON TN-
704 PM EDT SUN APR 19 2015

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN MARION...BLEDSOE...
SEQUATCHIE AND HAMILTON COUNTIES UNTIL 730 PM EDT/630 PM CDT/...

AT 702 PM EDT /602 PM CDT/...DOPPLER RADAR WAS TRACKING A LINE OF
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 7 MILES WEST OF
DUNLAP TO NEAR FAIRMOUNT TO NEAR SIGNAL MOUNTAIN TO 11 MILES
SOUTHWEST OF RIDGESIDE...AND MOVING NORTHEAST AT 50 MPH.

WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
CHATTANOOGA...DUNLAP...PIKEVILLE...SODDY-DAISY...SIGNAL MOUNTAIN...
WALDEN...LAKESITE...WHITWELL...RIDGESIDE...HARRISON...FAIRMOUNT...RED
BANK...COLLEGEDALE...POWELLS CROSSROADS...OOLTEWAH...LONE OAK...
BRAYTON...PALIO...CAGLE AND EAST BRAINERD.

LAT...LON 3532 8558 3541 8549 3553 8560 3557 8542
      3572 8526 3576 8526 3576 8507 3564 8503
      3557 8511 3553 8510 3549 8514 3543 8510
      3541 8502 3538 8503 3536 8497 3528 8494
      3514 8503 3501 8496 3499 8497 3498 8548
TIME...MOT...LOC 2302Z 245DEG 53KT 3535 8551 3523 8535 3510 8532 3497
8543

17

Special weather statement, Apr 19, 7:30 PM EDT, 1 hour 20 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
730 PM EDT SUN APR 19 2015

TNZ099-100-200015-
BRADLEY TN-HAMILTON TN-
730 PM EDT SUN APR 19 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN MCMINN...
NORTHWESTERN POLK...SOUTHWESTERN MEIGS...BRADLEY...EASTERN HAMILTON
AND SOUTHWESTERN RHEA COUNTIES UNTIL 815 PM EDT...

AT 730 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
HARRISON...OR 11 MILES WEST OF CLEVELAND...MOVING NORTHEAST AT 40
MPH.

NICKEL SIZE HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
CLEVELAND...SODDY-DAISY...LAKESITE...CHARLESTON...HARRISON...EAST
CLEVELAND...WILDWOOD LAKE...SOUTH CLEVELAND...COLLEGEDALE...
CALHOUN...TASSO...OOLTEWAH...EAST BRAINERD...SALE CREEK...
BIRCHWOOD...WATERVILLE...FLINT SPRINGS...SHADY GROVE...GAP SPRINGS
AND HOPEWELL.

LAT...LON 3499 8513 3515 8521 3546 8512 3543 8510
      3544 8506 3541 8502 3538 8503 3538 8500
      3536 8497 3529 8495 3529 8492 3536 8487
      3528 8473 3528 8475 3525 8473 3525 8470
      3524 8471 3517 8470 3499 8478
TIME...MOT...LOC 2330Z 229DEG 33KT 3514 8506

17

Special weather statement, Apr 19, 8:00 PM EDT, 50 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
800 PM EDT SUN APR 19 2015

TNZ067-082>086-100-101-200045-
RHEA TN-ROANE TN-BLEDSOE TN-WEST POLK TN-BRADLEY TN-
NORTHWEST MONROE TN-MCMINN TN-MEIGS TN-
800 PM EDT SUN APR 19 2015

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN MONROE...MCMINN...
NORTHEASTERN BLEDSOE...POLK...MEIGS...BRADLEY...SOUTHWESTERN
ROANE... SOUTHERN MORGAN...ROANE AND RHEA COUNTIES UNTIL 845 PM
EDT/745 PM CDT/...

AT 759 PM EDT /659 PM CDT/...DOPPLER RADAR WAS TRACKING A LINE OF
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 12 MILES NORTHWEST
OF SPRING CITY TO 6 MILES SOUTHWEST OF ATHENS TO NEAR WILDWOOD
LAKE...AND MOVING NORTHEAST AT 50 MPH.

WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
CLEVELAND...ATHENS...DAYTON...KINGSTON...SWEETWATER...ROCKWOOD...
MADISONVILLE...DECATUR...BENTON...ETOWAH...SPRING CITY...
CHARLESTON...EAST CLEVELAND...MIDTOWN...WILDWOOD LAKE...SOUTH
CLEVELAND...FAIRVIEW...HARRIMAN...ENGLEWOOD AND TELLICO PLAINS.

LAT...LON 3499 8497 3520 8500 3528 8494 3536 8497
      3538 8502 3576 8508 3577 8504 3575 8503
      3576 8492 3583 8477 3593 8465 3595 8456
      3574 8447 3563 8459 3564 8454 3562 8451
      3567 8450 3567 8443 3532 8428 3499 8459
TIME...MOT...LOC 2359Z 226DEG 78KT 3579 8504 3538 8468 3503 8482

17

Special weather statement, Apr 19, 8:29 PM EDT, 21 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
829 PM EDT SUN APR 19 2015

TNZ035-036-067>069-200115-
ROANE TN-KNOX TN-MORGAN TN-LOUDON TN-ANDERSON TN-
829 PM EDT SUN APR 19 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN MONROE...CENTRAL
KNOX...NORTHEASTERN MCMINN...SOUTHERN CAMPBELL...ROANE...NORTHWESTERN
BLOUNT...SOUTHEASTERN MORGAN...SOUTHWESTERN UNION...SOUTHERN SCOTT...
CENTRAL LOUDON AND ANDERSON COUNTIES UNTIL 915 PM EDT...

AT 829 PM EDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 9 MILES NORTHEAST OF
WARTBURG TO NEAR LOUDON...AND MOVING EAST AT 50 MPH.

WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
KNOXVILLE...OAK RIDGE...CLINTON...LENOIR CITY...KINGSTON...LOUDON...
FARRAGUT...OLIVER SPRINGS...LOUISVILLE...MIDTOWN...FAIRVIEW...
HARRIMAN...HALLS...LAKE CITY...NORRIS...PHILADELPHIA...OAKDALE...
MALONEYVILLE...KARNS AND DEARMOND.

LAT...LON 3561 8454 3564 8455 3565 8460 3623 8456
      3616 8444 3622 8430 3618 8424 3624 8423
      3623 8407 3630 8403 3617 8392 3617 8384
      3601 8381 3583 8412 3585 8414 3566 8442
      3567 8450
TIME...MOT...LOC 0029Z 251DEG 45KT 3621 8447 3567 8440

17

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 8:00 PM EDT	Special Weather Statement	MRX	Bradley, McMinn, Meigs, Polk, Rhea, Roane	45 min
Apr 19, 8:23 PM EDT	Severe Thunderstorm Warning	MRX	Loudon, McMinn, Monroe	37 min
Apr 19, 8:29 PM EDT	Special Weather Statement	MRX	Anderson, Knox, Loudon, Roane	46 min
Apr 19, 9:03 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Claiborne, Knox, Union	27 min
Apr 19, 9:15 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Grainger, Hamblen, Jefferson, Knox, Sevier and 1 more	30 min
Apr 19, 9:29 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Grainger, Hamblen, Hancock, Hawkins, Union	31 min
Apr 19, 9:41 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Grainger, Greene, Hamblen, Hawkins, Jefferson and 1 more	34 min
Apr 19, 9:56 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hamblen, Hancock, Hawkins	34 min
Apr 19, 10:11 PM EDT	Special Weather Statement	MRX	Greene, Unicoi	49 min
Apr 19, 10:21 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hancock, Hawkins, Sullivan, Unicoi, Washington	24 min
Apr 19, 10:44 PM EDT	Special Weather Statement	MRX	Carter, Johnson, Sullivan, Unicoi, Washington	46 min
Apr 19, 11:11 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Johnson, Sullivan	49 min
Apr 20, 3:44 AM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Hamilton, Marion, Sequatchie	46 min
Apr 20, 4:29 AM EDT	Special Weather Statement	MRX	Bledsoe, Bradley, Hamilton, Meigs, Rhea	46 min
Apr 20, 5:08 AM EDT	Special Weather Statement	MRX	Anderson, Knox, Roane	67 min
Apr 20, 5:11 AM EDT	Special Weather Statement	MRX	Campbell	49 min
Apr 20, 5:15 AM EDT	Special Weather Statement	MRX	Bradley, McMinn, Meigs, Monroe, Polk	45 min
Apr 20, 5:50 AM EDT	Special Weather Statement	MRX	Blount, Monroe, Sevier	40 min
Apr 20, 5:58 AM EDT	Special Weather Statement	MRX	Grainger, Hamblen	47 min
Apr 20, 7:22 AM EDT	River Flood Warning	MRX	Cocke	9 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.