Alert archive / Tennessee / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 141, NWS Nashville, TN

August 20, 20145 counties in Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Aug 20, 2014, 2:42 PM CDT for 5 counties in Tennessee. It was in force for 48 min. 1 report 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, 2:42 PM CDT (19:42 UTC)
Expired: Aug 20, 2014, 3:30 PM CDT
In force: 48 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Cannon County, TN, Coffee County, TN, DeKalb County, TN, Van Buren County, TN, Warren County, TN

The radar

The Nashville radar (KOHX), 81 km from the middle of the area, began a volume at 19:44 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, 2:45 PM CDT	TSTM WND DMG	Woodbury, TN	MINOR SIDING AND ROOF DAMAGE TO HOMES AND SEVERAL TREES BLOWN DOWN AROUND WOODBURY

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 3 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, 7.7 hours before the alert went out and 77 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.

699 
WUUS54 KOHX 201942
SVROHX
TNC015-031-041-175-177-202030-
/O.NEW.KOHX.SV.W.0141.140820T1942Z-140820T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
242 PM CDT WED AUG 20 2014

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN VAN BUREN COUNTY IN MIDDLE TENNESSEE...
  WARREN COUNTY IN MIDDLE TENNESSEE...
  CANNON COUNTY IN MIDDLE TENNESSEE...
  NORTHERN COFFEE COUNTY IN MIDDLE TENNESSEE...
  SOUTHERN DE KALB COUNTY IN MIDDLE TENNESSEE...

* UNTIL 330 PM CDT

* AT 239 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH. THESE SEVERE STORMS EXTENDED FROM SMITHVILLE TO
  10 MILES EAST OF WOODBURY TO WOODBURY...AND WERE MOVING SOUTHEAST
  AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MCMINNVILLE...SPENCER...MANCHESTER...BRADYVILLE...ROCK ISLAND STATE
  PARK...CENTERTOWN...SUMMITVILLE...MORRISON AND VIOLA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEEK SHELTER IN A STURDY BUILDING AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3542 8613 3569 8624 3571 8621 3576 8618
      3595 8614 3596 8602 3598 8602 3602 8583
      3592 8578 3584 8564 3582 8566 3583 8568
      3582 8567 3579 8560 3581 8558 3579 8552
      3570 8540
TIME...MOT...LOC 1942Z 314DEG 40KT 3585 8569 3578 8587
          3578 8613

$$

27

2 follow-up statements

357 
WWUS54 KOHX 202000
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
300 PM CDT WED AUG 20 2014

TNC015-031-041-175-177-202030-
/O.CON.KOHX.SV.W.0141.000000T0000Z-140820T2030Z/
VAN BUREN TN-WARREN TN-CANNON TN-COFFEE TN-DE KALB TN-
300 PM CDT WED AUG 20 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM CDT
FOR SOUTHWESTERN DE KALB...NORTHERN COFFEE...CANNON...WARREN AND
NORTHWESTERN VAN BUREN COUNTIES...

AT 257 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM SPENCER TO MCMINNVILLE TO CENTERTOWN...MOVING SOUTHEAST AT 45
MPH.

LOCATIONS IMPACTED INCLUDE...
  SPENCER...MANCHESTER...SUMMITVILLE...MORRISON AND VIOLA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEEK SHELTER IN A STURDY BUILDING AND STAY AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT
WEDNESDAY EVENING FOR CENTRAL TENNESSEE.

&&

LAT...LON 3542 8613 3569 8624 3571 8621 3576 8618
      3595 8614 3596 8602 3598 8602 3602 8583
      3592 8578 3584 8564 3582 8566 3583 8568
      3582 8567 3579 8560 3581 8558 3579 8552
      3570 8540
TIME...MOT...LOC 2000Z 314DEG 40KT 3571 8551 3564 8569
          3564 8595

$$

27

715 
WWUS54 KOHX 202015
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
315 PM CDT WED AUG 20 2014

TNC015-031-041-175-177-202030-
/O.CON.KOHX.SV.W.0141.000000T0000Z-140820T2030Z/
VAN BUREN TN-WARREN TN-CANNON TN-COFFEE TN-DE KALB TN-
315 PM CDT WED AUG 20 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM CDT
FOR SOUTHWESTERN DE KALB...NORTHERN COFFEE...CANNON...WARREN AND
NORTHWESTERN VAN BUREN COUNTIES...

AT 314 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM 11 MILES SOUTHEAST OF SPENCER TO 16 MILES SOUTH OF SPENCER TO
VIOLA...MOVING SOUTHEAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEEK SHELTER IN A STURDY BUILDING AND STAY AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT
WEDNESDAY EVENING FOR CENTRAL TENNESSEE.

&&

LAT...LON 3542 8613 3569 8624 3571 8621 3576 8618
      3595 8614 3596 8602 3598 8602 3602 8583
      3592 8578 3584 8564 3582 8566 3583 8568
      3582 8567 3579 8560 3581 8558 3579 8552
      3570 8540
TIME...MOT...LOC 2016Z 314DEG 40KT 3559 8535 3552 8553
          3552 8579

$$

27

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 Nashville, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 20, 12:35 PM CDT, 2 hours 7 minutes earlier.

Area forecast discussion, Aug 20, 12:35 PM CDT, 2 hours 7 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
1235 PM CDT WED AUG 20 2014

.UPDATE...FOR 18Z AVIATION.

&&

.AVIATION...18Z TAF DISCUSSION.

VFR CONDITIONS AT ALL MIDDLE TENNESSEE TERMINALS THROUGH MOST OF
THIS PERIOD. CAN EXPECT SOME TS IN THE AREA OF KCSV THIS
AFTERNOON BUT SCATTERED ENOUGH TO PRECLUDE FROM PREVAILING. LOOK
FOR A COUPLE HOURS OF IFR AROUND SUNRISE AT KCSV AS VIS DROPS.
WINDS WILL BE LIGHT OUT OF THE SOUTHWEST.

UNGER

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

27

Hazardous weather outlook, Aug 20, 5:00 AM CDT, 9 hours 42 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
500 AM CDT WED AUG 20 2014

TNZ005>011-023>034-056>066-075-077>080-093>095-211000-
STEWART-MONTGOMERY-ROBERTSON-SUMNER-MACON-CLAY-PICKETT-HOUSTON-
HUMPHREYS-DICKSON-CHEATHAM-DAVIDSON-WILSON-TROUSDALE-SMITH-
JACKSON-PUTNAM-OVERTON-FENTRESS-PERRY-HICKMAN-LEWIS-WILLIAMSON-
MAURY-MARSHALL-RUTHERFORD-CANNON-DE KALB-WHITE-CUMBERLAND-BEDFORD-
COFFEE-WARREN-GRUNDY-VAN BUREN-WAYNE-LAWRENCE-GILES-
500 AM CDT WED AUG 20 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

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

AN UPPER LEVEL RIDGE OF HIGH PRESSURE WILL BRING HOT TEMPERATURES
AND HIGH HUMIDITY LEVELS TO MIDDLE TENNESSEE FROM THURSDAY
THROUGH EARLY NEXT WEEK. HEAT INDEX VALUES WILL TOP OUT IN THE
100-105 RANGE EACH AFTERNOON.

55

In the hours before

Special weather statement, Aug 20, 1:25 PM CDT, 1 hour 17 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
125 PM CDT WED AUG 20 2014

TNZ028>030-201900-
SMITH-TROUSDALE-WILSON-
125 PM CDT WED AUG 20 2014

...SIGNIFICANT WEATHER ADVISORY FOR SMITH...TROUSDALE AND WILSON
COUNTIES...

AT 122 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM NEAR HARTSVILLE...MOVING SOUTHEAST AT 15 MPH.

SOME LOCATIONS IN THE PATH INCLUDE HARTSVILLE...DICKERSON CHAPEL
RECREATION AREA AND TUCKERS CROSSROADS.

WINDS 40 TO 50 MPH AND PEA SIZED HAIL ARE EXPECTED WITH THIS STORM.

LAT...LON 3648 8619 3644 8617 3644 8612 3624 8597
      3614 8621 3631 8632 3631 8631 3636 8628
      3636 8627 3645 8627 3646 8623 3649 8623

27

Special weather statement, Aug 20, 1:31 PM CDT, 1 hour 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
131 PM CDT WED AUG 20 2014

TNZ027-201900-
DAVIDSON-
131 PM CDT WED AUG 20 2014

...SIGNIFICANT WEATHER ADVISORY FOR DAVIDSON COUNTY...

AT 128 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM NEAR HERMITAGE...MOVING SOUTHEAST AT 15 MPH.

SOME LOCATIONS IN THE PATH INCLUDE OLD HICKORY...HERMITAGE AND PERCY
PRIEST LAKE.

PENNY SIZE HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3625 8663 3624 8659 3614 8656 3614 8652
      3611 8654 3610 8652 3606 8652 3606 8653
      3609 8655 3604 8656 3602 8660 3616 8676
      3629 8669

27

Local storm report, Aug 20, 1:55 PM CDT, 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
155 PM CDT WED AUG 20 2014

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

0154 PM     HAIL             4 SW HARTSVILLE         36.35N  86.21W
08/20/2014  E1.00 INCH       TROUSDALE          TN   TRAINED SPOTTER

&&

EVENT NUMBER OHX1400530

21

Special weather statement, Aug 20, 2:14 PM CDT, 28 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
214 PM CDT WED AUG 20 2014

TNZ008-029-202000-
SUMNER-TROUSDALE-
214 PM CDT WED AUG 20 2014

...SIGNIFICANT WEATHER ADVISORY FOR SUMNER AND TROUSDALE COUNTIES...

AT 213 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM NEAR GALLATIN...MOVING SOUTHEAST AT 15 MPH.

SOME LOCATIONS IN THE PATH INCLUDE BETHPAGE...GALLATIN...BLEDSOE
CREEK STATE PARK...CASTALIAN SPRINGS AND HARTSVILLE.

SMALL HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THIS STORM.

LAT...LON 3647 8620 3644 8617 3641 8597 3637 8606
      3630 8613 3632 8616 3632 8619 3635 8621
      3631 8626 3635 8627 3634 8630 3631 8631
      3631 8635 3636 8636 3633 8640 3636 8649
      3651 8639

27

Local storm report, Aug 20, 2:20 PM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
220 PM CDT WED AUG 20 2014

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

0219 PM     TSTM WND GST     ALEXANDRIA              36.08N  86.03W
08/20/2014  E60 MPH          DE KALB            TN   TRAINED SPOTTER

&&

EVENT NUMBER OHX1400531

21

Local storm report, Aug 20, 2:25 PM CDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
225 PM CDT WED AUG 20 2014

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

0150 PM     TSTM WND DMG     MOUNT JULIET            36.21N  86.52W
08/20/2014                   WILSON             TN   NWS EMPLOYEE

            A FEW TREES AND POWERLINES DOWN

&&

EVENT NUMBER OHX1400532

21

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 1:25 PM CDT	Special Weather Statement	OHX	Trousdale	35 min
Aug 20, 1:31 PM CDT	Special Weather Statement	OHX	Davidson	29 min
Aug 20, 1:42 PM CDT	Severe Thunderstorm Warning	OHX	Sumner, Trousdale, Wilson	33 min
Aug 20, 1:46 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Wilson	44 min
Aug 20, 1:58 PM CDT	Severe Thunderstorm Warning	OHX	Smith, Trousdale, Wilson	47 min
Aug 20, 2:11 PM CDT	Severe Thunderstorm Warning	OHX	Cannon, DeKalb, Smith, Wilson	34 min
Aug 20, 2:14 PM CDT	Special Weather Statement	OHX	Trousdale	46 min
Aug 20, 2:37 PM CDT	Severe Thunderstorm Warning	OHX	DeKalb, White	23 min
Aug 20, 2:54 PM CDT	Flash Flood Warning	OHX	Smith, Trousdale, Wilson	3 hr
Aug 20, 2:56 PM CDT	Special Weather Statement	OHX	Smith	34 min
Aug 20, 2:58 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland, DeKalb, Van Buren, White	47 min
Aug 20, 3:06 PM CDT	Special Weather Statement	OHX	Davidson	39 min
Aug 20, 3:14 PM CDT	Severe Thunderstorm Warning	OHX	Rutherford, Wilson	46 min
Aug 20, 3:34 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Williamson, Wilson	41 min
Aug 20, 3:46 PM CDT	Flash Flood Warning	OHX	Wilson	3 hr
Aug 20, 3:58 PM CDT	Special Weather Statement	OHX	Rutherford	47 min
Aug 20, 4:02 PM CDT	Special Weather Statement	OHX	Grundy	43 min
Aug 20, 4:14 PM CDT	Areal Flood Advisory	OHX	Rutherford	3 hr
Aug 20, 4:15 PM CDT	Special Weather Statement	OHX	Robertson	45 min
Aug 20, 4:20 PM CDT	Severe Thunderstorm Warning	OHX	Robertson, Sumner	40 min
Aug 20, 4:30 PM CDT	Severe Thunderstorm Warning	OHX	Montgomery, Robertson	45 min
Aug 20, 4:41 PM CDT	Severe Thunderstorm Warning	OHX	Sumner	34 min
Aug 20, 4:44 PM CDT	Areal Flood Advisory	OHX	Montgomery, Robertson, Sumner	3 hr
Aug 20, 4:54 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Montgomery, Robertson	21 min
Aug 20, 5:08 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Robertson, Sumner, Trousdale, Wilson	37 min
Aug 20, 5:33 PM CDT	Areal Flood Advisory	OHX	Davidson, Robertson, Sumner, Wilson	3 hr
Aug 20, 5:40 PM CDT	Special Weather Statement	OHX	Montgomery	35 min
Aug 20, 5:56 PM CDT	Special Weather Statement	OHX	Stewart	34 min
Aug 20, 6:05 PM CDT	Special Weather Statement	OHX	Davidson	40 min
Aug 20, 6:27 PM CDT	Special Weather Statement	OHX	Cheatham	48 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.