Alert archive / Tennessee / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 31, NWS Morristown, TN

May 11, 2015Scott County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at May 11, 2015, 3:02 PM EDT for Scott County, Tennessee. It was in force for 28 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: May 11, 2015, 3:02 PM EDT (19:02 UTC)
Expired: May 11, 2015, 3:30 PM EDT
In force: 28 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Scott County, TN

The radar

The Knoxville radar (KMRX), 103 km from the middle of the area, began a volume at 19:04 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 12:00Z, 7.0 hours before the alert went out and 191 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: 347 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1481 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 May 11, 1:21 PM EDT, 1 hour 41 minutes earlier.

Area forecast discussion, May 11, 1:21 PM EDT, 1 hour 41 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
121 PM EDT MON MAY 11 2015

.AVIATION...A WEAK COLD FRONT WILL MOVE ACROSS EAST TENNESSEE
BETWEEN 12-15Z TUESDAY. BEFORE FROPA...PERIODS OF CONVECTION WILL
MOVE ACROSS/NEAR THE TAF SITES. FIRST ROUND WILL BE THIS AFTERNOON/
EARLY EVENING. A BREAK IN THE CONVECTION IS EXPECTED BETWEEN 23Z AND
04Z...THEN ANOTHER BROKEN LINE OF CONVECTION IS ANTICIPATED.

STRONG GUSTY WINDS AND FREQUENT LIGHTNING ARE EXPECTED WITH THE
STRONGER STORMS. OUTSIDE OF THUNDERSTORMS...VFR CONDITIONS WILL BE
THE RULE.

&&

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

Hazardous weather outlook, May 11, 3:01 PM EDT, 1 minute before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
301 PM EDT MON MAY 11 2015

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-121915-
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-
301 PM EDT MON MAY 11 2015

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 ISOLATED SEVERE THUNDERSTORMS WILL BE POSSIBLE
THROUGH THIS EVENING...AND AGAIN OVERNIGHT AS A COLD FRONT
APPROACHES THE REGION FROM THE WEST. THE MAIN THREATS WITH THE
STRONGEST ACTIVITY WILL BE DAMAGING WINDS UP TO 60 MPH...AND
QUARTER SIZE HAIL. IN ADDITION...LOCALLY HEAVY DOWNPOURS MAY LEAD
TO LOCALIZED FLOODING OF LOW LYING AREAS...MINOR STREET FLOODING
AND RAPID SMALL STREAM RISES IN A FEW LOCATIONS AS WELL.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH MONDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED LATER THIS AFTERNOON AND EVENING.

In the hours before

Special weather statement, May 11, 1:32 PM EDT, 1 hour 30 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
132 PM EDT MON MAY 11 2015

TNZ040-041-111815-
COCKE SMOKY MOUNTAINS TN-NORTHWEST COCKE TN-
132 PM EDT MON MAY 11 2015

SIGNIFICANT WEATHER ADVISORY FOR COCKE SMOKY MOUNTAINS...AND
NORTHWEST COCKE COUNTIES UNTIL 215 PM EDT...

AT 132 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 13
MILES SOUTH OF NEWPORT...MOVING NORTHEAST AT 10 MPH.

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

LOCATIONS IMPACTED INCLUDE...
HARTFORD AND COSBY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3574 8328 3577 8327 3580 8329 3591 8318
      3580 8296 3579 8296 3577 8299 3579 8303
      3579 8308 3577 8311 3577 8316 3573 8320
      3573 8324 3572 8326
TIME...MOT...LOC 1732Z 219DEG 7KT 3576 8318

SR

Special weather statement, May 11, 2:11 PM EDT, 51 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
211 PM EDT MON MAY 11 2015

TNZ082-083-111845-
RHEA TN-BLEDSOE TN-
211 PM EDT MON MAY 11 2015

SIGNIFICANT WEATHER ADVISORY FOR RHEA...AND BLEDSOE COUNTIES UNTIL
245 PM EDT/145 PM CDT/...

AT 210 PM EDT /110 PM CDT/...DOPPLER RADAR WAS TRACKING A STRONG
THUNDERSTORM NEAR SPRING CITY...OR 11 MILES NORTH OF DAYTON...MOVING
NORTHEAST AT 25 MPH.

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

LOCATIONS IMPACTED INCLUDE...
SPRING CITY...EVENSVILLE AND GRANDVIEW.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3554 8497 3567 8512 3575 8504 3575 8503
      3577 8494 3576 8492 3578 8490 3578 8488
      3582 8481 3572 8471 3570 8472 3568 8475
      3569 8475 3570 8477 3568 8478 3566 8478
TIME...MOT...LOC 1810Z 225DEG 24KT 3566 8498

SR

Special weather statement, May 11, 2:22 PM EDT, 40 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
222 PM EDT MON MAY 11 2015

TNZ012-111900-
SCOTT TN-
222 PM EDT MON MAY 11 2015

SIGNIFICANT WEATHER ADVISORY FOR SCOTT COUNTY UNTIL 300 PM EDT...

AT 221 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
ONEIDA...MOVING NORTHEAST AT 30 MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
ONEIDA AND WINFIELD.

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 3660 8457 3659 8430 3645 8454 3656 8467
      3660 8462
TIME...MOT...LOC 1821Z 229DEG 24KT 3654 8454

JW

Special weather statement, May 11, 2:36 PM EDT, 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
236 PM EDT MON MAY 11 2015

TNZ012-111915-
SCOTT TN-
236 PM EDT MON MAY 11 2015

SIGNIFICANT WEATHER ADVISORY FOR SCOTT COUNTY UNTIL 315 PM EDT...

AT 236 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 7
MILES WEST OF HELENWOOD...OR 11 MILES SOUTHWEST OF ONEIDA...MOVING
NORTHEAST AT 30 MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
ONEIDA...HUNTSVILLE...HELENWOOD...WINFIELD...ELGIN...BIG SOUTH FORK
NATIONAL AND KETCHEN.

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 3659 8431 3659 8430 3627 8462 3637 8470
      3639 8469 3640 8466 3641 8467 3641 8466
      3644 8469 3650 8471 3658 8477 3660 8476
TIME...MOT...LOC 1836Z 211DEG 26KT 3639 8467

JW

Special weather statement, May 11, 2:49 PM EDT, 13 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
149 PM CDT MON MAY 11 2015

TNZ081-082-111915-
BLEDSOE TN-SEQUATCHIE TN-
149 PM CDT MON MAY 11 2015

SIGNIFICANT WEATHER ADVISORY FOR BLEDSOE...AND SEQUATCHIE COUNTIES
UNTIL 215 PM CDT...

AT 148 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 13
MILES NORTHWEST OF DUNLAP...MOVING NORTHEAST AT 30 MPH.

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

LOCATIONS IMPACTED INCLUDE...
CAGLE AND OLD CUMBERLAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3553 8556 3554 8554 3555 8550 3555 8546
      3556 8545 3557 8542 3568 8530 3566 8524
      3543 8550 3546 8554 3549 8554 3553 8560
TIME...MOT...LOC 1848Z 221DEG 27KT 3555 8548

SR

Special weather statement, May 11, 3:01 PM EDT, 1 minute before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
301 PM EDT MON MAY 11 2015

TNZ035-067-111930-
ROANE TN-MORGAN TN-
301 PM EDT MON MAY 11 2015

SIGNIFICANT WEATHER ADVISORY FOR ROANE...AND MORGAN COUNTIES UNTIL
330 PM EDT...

AT 301 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
WARTBURG...MOVING NORTHEAST AT 35 MPH.

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

LOCATIONS IMPACTED INCLUDE...
WARTBURG...OLIVER SPRINGS...HARRIMAN...OAKDALE...PINE ORCHARD...
DEARMOND AND PETROS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3603 8474 3622 8451 3620 8447 3619 8447
      3616 8444 3614 8445 3613 8443 3611 8442
      3611 8440 3609 8438 3604 8434 3590 8459
TIME...MOT...LOC 1901Z 228DEG 31KT 3602 8460

SR

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 12:23 PM EDT	Special Weather Statement	MRX	Hamilton	52 min
May 11, 12:32 PM EDT	Special Weather Statement	MRX	Scott	43 min
May 11, 12:51 PM EDT	Special Weather Statement	MRX	Monroe	24 min
May 11, 1:22 PM EDT	Special Weather Statement	MRX	Hamilton	23 min
May 11, 1:32 PM EDT	Special Weather Statement	MRX	Cocke	43 min
May 11, 2:11 PM EDT	Special Weather Statement	MRX	Rhea	34 min
May 11, 2:22 PM EDT	Special Weather Statement	MRX	Scott	38 min
May 11, 2:36 PM EDT	Special Weather Statement	MRX	Scott	39 min
May 11, 2:49 PM EDT	Special Weather Statement	MRX	Van Buren	26 min
May 11, 3:01 PM EDT	Special Weather Statement	MRX	Morgan	29 min
May 11, 3:21 PM EDT	Special Weather Statement	MRX	Anderson	24 min
May 11, 3:31 PM EDT	Severe Thunderstorm Warning	MRX	Scott	44 min
May 11, 3:37 PM EDT	Special Weather Statement	MRX	Unicoi	38 min
May 11, 3:39 PM EDT	Special Weather Statement	MRX	Bradley	36 min
May 11, 3:42 PM EDT	Areal Flood Advisory	MRX	Scott	3 hr
May 11, 3:44 PM EDT	Special Weather Statement	MRX	Campbell	31 min
May 11, 3:46 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Morgan, Scott	59 min
May 11, 3:47 PM EDT	Special Weather Statement	MRX	Bradley	43 min
May 11, 3:56 PM EDT	Special Weather Statement	MRX	Meigs	34 min
May 11, 4:03 PM EDT	Special Weather Statement	MRX	Sevier	27 min
May 11, 4:04 PM EDT	Special Weather Statement	MRX	Carter	56 min
May 11, 4:45 PM EDT	Special Weather Statement	MRX	Loudon	30 min
May 11, 5:08 PM EDT	Special Weather Statement	MRX	Anderson	37 min
May 11, 5:15 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Johnson	45 min
May 11, 5:21 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Unicoi, Washington	39 min
May 11, 5:46 PM EDT	Special Weather Statement	MRX	Unicoi, Washington	44 min
May 11, 5:58 PM EDT	Special Weather Statement	MRX	Carter, Johnson	47 min
May 11, 6:38 PM EDT	Areal Flood Advisory	MRX	Carter, Johnson	112 min
May 11, 6:49 PM EDT	Special Weather Statement	MRX	Washington, City of Bristol	41 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.