Alert archive / Tennessee / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 18, NWS Morristown, TN

April 19, 20154 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Apr 19, 2015, 9:56 PM EDT for 4 counties in Tennessee. It was in force for 34 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: Apr 19, 2015, 9:56 PM EDT (01:56 UTC)
Expired: Apr 19, 2015, 10:30 PM EDT
In force: 34 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN

The radar

The Knoxville radar (KMRX), 35 km from the middle of the area, began a volume at 01:57 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 00:00Z, 1.9 hours before the alert went out and 317 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

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, 9:26 PM EDT, 30 minutes earlier.

Area forecast discussion, Apr 19, 9:26 PM EDT, 30 minutes before

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

.DISCUSSION...
A LINE OF STRONG TO SEVERE STORMS CONTINUES TO TRACK ACROSS THE
CENTRAL VALLEY LATE THIS EVENING...WITH DAMAGING WINDS REMAINING
THE PREDOMINANT THREAT WITHIN THE BOWING SEGMENTS. THIS LINE WILL
QUICKLY TRACK NORTH AND EAST THROUGH THE REGION WITHIN THE NEXT
COUPLE OF HOURS...AND SHOULD GENERALLY WEAKEN AS IT TRACKS INTO A
MORE STABLE ENVIRONMENT ACROSS FAR NE TN AND SW VA. SOME CLEARING
TO PARTIAL CLEARING WILL BRIEFLY OCCUR IN ITS WAKE BETWEEN
03-06Z...BEFORE ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS WILL
MOVE TOWARD THE CUMBERLAND PLATEAU AHEAD OF A COLD FRONT LATE
TONIGHT BETWEEN 06-09Z...AND MOVE ACROSS THE REGION DURING A 09-15Z
TIMEFRAME. THERE WILL BE ENOUGH ELEVATED INSTABLITY TO SUPPORT SOME
ORGANIZED LINES WHICH WILL BE CAPABLE OF LOCALIZED CONVECTIVE
DAMAGING WIND GUSTS WITHIN THE STRONGER BOWING SEGMENTS...AS WELL
AS LOCALLY HEAVY RAINFALL WITHIN THE MOIST BOUNDARY LAYER.

&&

.PRELIMINARY POINT TEMPS/POPS...
CHATTANOOGA AIRPORT, TN             61  72  48  70 /  60  40  20  10
KNOXVILLE MCGHEE TYSON AIRPORT, TN  60  70  46  66 /  70  60  20  10
OAK RIDGE, TN                       60  69  46  67 /  70  60  20  10
TRI CITIES AIRPORT, TN              57  71  44  63 /  70  60  40  10

&&

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

AMP

Hazardous weather outlook, Apr 19, 4:04 PM EDT, 5 hours 52 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, 7:04 PM EDT, 2 hours 52 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, 2 hours 26 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, 1 hour 56 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, 1 hour 27 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

Local storm report, Apr 19, 8:59 PM EDT, 57 minutes before

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Local storm report, Apr 19, 9:16 PM EDT, 40 minutes before

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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, 8:50 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Blount, Knox, Sevier	25 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, 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
Apr 19, 10:00 PM EDT	Special Weather Statement	MRX	Lee, Wise, City of Norton	45 min
Apr 19, 10:30 PM EDT	Severe Thunderstorm Warning	MRX	Lee, Russell, Scott, Washington, Wise, City of Bristol and 1 more	45 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.