Alert archive / Tennessee / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 10, NWS Nashville, TN

April 2, 2015Cheatham County, Davidson County, Williamson County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Apr 2, 2015, 4:09 PM CDT for Cheatham County, Davidson County, Williamson County, Tennessee. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 2, 2015, 4:09 PM CDT (21:09 UTC)
Expired: Apr 2, 2015, 4:45 PM CDT
In force: 36 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Cheatham County, TN, Davidson County, TN, Williamson County, TN

The radar

The Nashville radar (KOHX), 44 km from the middle of the area, began a volume at 21:10 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.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 1 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, 9.2 hours before the alert went out and 37 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: 114 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 1203 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 193 m²/s²
0-3 km storm-relative helicity: 202 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

995 
WUUS54 KOHX 022109
SVROHX
TNC021-037-187-022145-
/O.NEW.KOHX.SV.W.0010.150402T2109Z-150402T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
409 PM CDT THU APR 2 2015

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL CHEATHAM COUNTY IN MIDDLE TENNESSEE...
  WESTERN DAVIDSON COUNTY IN MIDDLE TENNESSEE...
  NORTHERN WILLIAMSON COUNTY IN MIDDLE TENNESSEE...

* UNTIL 445 PM CDT

* AT 407 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR FAIRVIEW...
  AND MOVING NORTHEAST AT 50 MPH.

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

  SOURCE...RADAR INDICATED.

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

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  KINGSTON SPRINGS AROUND 415 PM CDT.
  PEGRAM AROUND 420 PM CDT.
  BELLEVUE AROUND 425 PM CDT.
  BELLE MEADE AND FOREST HILLS AROUND 430 PM CDT.
  NASHVILLE AND OAK HILL AROUND 435 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE NATCHEZ TRACE AT HIGHWAY 96...
BELLS BEND...BERRY HILL AND WHITES CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3634 8684 3600 8667 3584 8717 3597 8721
      3598 8719 3613 8717
TIME...MOT...LOC 2109Z 238DEG 43KT 3600 8714

HAIL...0.88IN
WIND...60MPH

$$

11

1 follow-up statement

002 
WWUS54 KOHX 022137
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
437 PM CDT THU APR 2 2015

TNC021-022146-
/O.CAN.KOHX.SV.W.0010.000000T0000Z-150402T2145Z/
CHEATHAM TN-
437 PM CDT THU APR 2 2015

THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF SOUTH
CENTRAL CHEATHAM COUNTY.

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL CHEATHAM COUNTY
IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 3607 8699 3621 8698 3634 8684 3600 8667
      3593 8690
TIME...MOT...LOC 2136Z 238DEG 43KT 3617 8680

$$

TNC037-187-022145-
/O.CON.KOHX.SV.W.0010.000000T0000Z-150402T2145Z/
WILLIAMSON TN-DAVIDSON TN-
437 PM CDT THU APR 2 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN
DAVIDSON AND NORTH CENTRAL WILLIAMSON COUNTIES UNTIL 445 PM CDT...

AT 434 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR NASHVILLE...
AND MOVING NORTHEAST AT 50 MPH.

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

SOURCE...RADAR INDICATED.

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

THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF NORTH
CENTRAL WILLIAMSON AND WESTERN DAVIDSON COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3607 8699 3621 8698 3634 8684 3600 8667
      3593 8690
TIME...MOT...LOC 2136Z 238DEG 43KT 3617 8680

HAIL...0.88IN
WIND...60MPH

$$

11

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 Apr 2, 3:00 PM CDT, 1 hour 9 minutes earlier.

Area forecast discussion, Apr 2, 3:00 PM CDT, 1 hour 9 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
300 PM CDT THU APR 2 2015

.DISCUSSION...
MAIN SFC BOUNDARY STRETCHES FROM MI SW ACROSS OK. ORGANIZED LINEAR
CONVECTION NOW FIRING EAST OF THE BOUNDARY AND IS AS CLOSE AS WESTERN
KY....JUST NW OF STEWART COUNTY. FURTHER SOUTH...ISOLATED TO
SCATTERED TSTMS HAVE MOVED JUST EAST OF THE TN RIVER.

THE BOUNDARY AND THE ASSOCIATED SFC LOW WILL MAKE SOME
PROGRESS OVERNIGHT. HOWEVER...THE BETTER LOW LEVEL FORCING IS
EXPECTED TO REMAIN NORTH OF TN WITH THE SFC LOW TRACKING ACROSS
WESTERN KY. BY 12Z...THE HEAVIEST RAINFALL MAY REACH AS FAR SOUTH
AS OUR NORTHERN BORDER...BUT CLEARLY THE HEAVIEST ACTIVITY WILL BE
TO OUR NORTH. WILL INCLUDE AVG QPF VALUES OF JUST OVER OVER ONE
HALF INCH NORTHWEST...WILL LESSER VALUES AS YOU GO SOUTH AND EAST.

AS FAR AS TSTMS FOR THIS AFTERNOON...A FEW COULD REACH STRONG TO
SEVERE LIMITS BUT IT LOOKS AS THOUGH THE BETTER CHANCE OF STRONG
TO SEVERE CONVECTION WILL BE TOMORROW. ON FRIDAY...THE MAIN
FRONTAL BOUNDARY WILL CROSS THE AREA IN THE AFTERNOON. AHEAD OF
THIS FEATURE...MORE IN THE WAY OF INSTABILITY CAN BE EXPECTED. 850
MB FLOW WILL REACH 40 KTS AND COUPLE WITH SOME DESCENT LOW LEVEL
FORCING. SPC CURRENTLY HAS THE AREA IN AN ENHANCED RISK. LOW LEVEL
WIND SHEAR DOES NOT LOOK ALL THAT STRONG AND THUS...DAMAGING WINDS
AND HAIL WILL BE THE PRIMARY THREAT. OTW...QPF TOTALS OF 1/4 TO
1/2 INCH ARE EXPECTED. SOME LIGHT SHOWER ACTIVITY WILL EXIST FOR A
SHORT SPELL IN WAKE OF THE FROPA.

FRIDAY NIGHT...PARTIAL CLEARING TOWARD SUNRISE AND THAT WILL SET THE
STAGE FOR MOSTLY SUNNY/CLEAR SKIES SAT AND SAT NT.

FOR THE SHORT TERM TEMPS...AFTER HIGHS IN THE 70S ON FRIDAY...TEMPS
WILL COOL DOWN TO SEASONAL LEVELS.

IN THE EXT FCST...AN ACTIVE SUBTROPICAL JET WILL DOMINATE THE
WEATHER PATTERN. SFC HIGH...THAT WILL BRING THE SEASONAL WEATHER
FOR THE WEEKEND...WILL SHIFT EAST WITH A DEEPER SOUTHERLY FLOW
SETTING UP. SFC BOUNDARY WILL SET UP AND EXTEND FROM TX ENE ACROSS
IL...IN AND OH. WITHIN THE WARM SECTOR...THAT MID TN WILL BE
UNDER...MODELS HINT TOWARD A SERIES OF IMPULSES THROUGHOUT THE WEEK.
THUS...SHOWERS AND TSTMS WILL BE INCLUDED THROUGH THE PERIOD. BY
LATE IN THE WEEK...THE AFOREMENTIONED FRONTAL BOUNDARY WILL FINALLY
REACH OUR AREA WITH PERHAPS SOME HEAVIER RAINFALL TOWARD THE END OF
THE PERIOD.

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      63  76  45  62 /  50  80  60   0
CLARKSVILLE    61  73  41  60 /  80  80  50   0
CROSSVILLE     59  71  44  59 /  40  80  70   0
COLUMBIA       63  77  45  62 /  30  80  50   0
LAWRENCEBURG   61  76  46  62 /  30  80  50   0
WAVERLY        61  75  41  60 /  60  80  50   0

&&

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

&&

21

Hazardous weather outlook, Apr 2, 5:00 AM CDT, 11 hours 9 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
500 AM CDT THU APR 2 2015

TNZ005>011-023>034-056>066-075-077>080-093>095-031000-
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 THU APR 2 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR LOCATIONS GENERALLY
ALONG AND NORTH OF A LOBELVILLE TO NASHVILLE TO LAFAYETTE LINE FOR THIS
AFTERNOON. STRONG THUNDERSTORMS WILL BE POSSIBLE FOR OTHER LOCATIONS
ACROSS MIDDLE TENNESSEE. MAIN CONCERNS WITH STRONG TO SEVERE THUNDERSTORMS
WILL BE STRONG TO DAMAGING WINDS AND LARGE HAIL.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FOR ALMOST ALL OF
MIDDLE TENNESSEE FRIDAY AFTERNOON INTO FRIDAY EVENING. PICKETT...
FENTRESS...AND CUMBERLAND COUNTIES ARE UNDER A SLIGHT RISK OF SEVERE
THUNDERSTORMS FRIDAY AFTERNOON INTO FRIDAY EVENING. MAIN CONCERNS
WITH SEVERE THUNDERSTORMS WILL BE DAMAGING WINDS AND LARGE HAIL.

PATCHY FROST FORMATION MAY BE POSSIBLE ACROSS THE AREA SATURDAY
NIGHT AS TEMPERATURES ARE EXPECTED IN THE MID 30S IN LOW LYING
AND SHELTER AREAS AND ACROSS THE CUMBERLAND PLATEAU REGION.

.SPOTTER CALL TO ACTION STATEMENT...

REPORTS FROM TRAINED WEATHER SPOTTERS MAY BE NEEDED.

SPOTTER THUNDERSTORM REPORTING CRITERIA...
TORNADO
FUNNEL CLOUD
FLOODING
HAIL >= 1/2 INCH
WINDS > 50 MPH (MEASURED)
STRUCTURAL DAMAGE
TREES OR POWER LINES DOWN

31

In the hours before

Special weather statement, Apr 2, 2:07 PM CDT, 2 hours 2 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
207 PM CDT THU APR 2 2015

TNZ032>034-066-021945-
CUMBERLAND-FENTRESS-OVERTON-PUTNAM-
207 PM CDT THU APR 2 2015

...SIGNIFICANT WEATHER ADVISORY FOR CUMBERLAND...FENTRESS...OVERTON
AND PUTNAM COUNTIES...

AT 206 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM NEAR MONTEREY...MOVING NORTHEAST AT 45 MPH.

SOME LOCATIONS IN THE PATH INCLUDE MONTEREY...CRAWFORD...
CLARKRANGE...GRIMSLEY AND ALLARDT.

WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS STORM.

HEAVY RAINFALL COULD CAUSE WATER TO RISE OVER ROADS AND FLOOD LOW
LYING AREAS. DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

LAT...LON 3629 8480 3628 8487 3624 8487 3621 8491
      3616 8490 3612 8485 3598 8527 3599 8530
      3601 8532 3603 8531 3604 8534 3612 8541
      3651 8491 3633 8477

ROSE

Local storm report, Apr 2, 2:17 PM CDT, 1 hour 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
217 PM CDT THU APR 02 2015

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

0155 PM     TSTM WND GST     8 NNW SPARTA            36.04N  85.53W
04/02/2015  M60 MPH          WHITE              TN   AWOS

            SPARTA AIRPORT

&&

EVENT NUMBER OHX1500416

MROSE

Special weather statement, Apr 2, 3:21 PM CDT, 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
321 PM CDT THU APR 2 2015

TNZ005-006-023-022100-
HOUSTON-MONTGOMERY-STEWART-
321 PM CDT THU APR 2 2015

...SIGNIFICANT WEATHER ADVISORY FOR HOUSTON...MONTGOMERY AND STEWART
COUNTIES...

AT 318 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM NEAR ERIN...MOVING NORTHEAST AT 30 MPH.

SOME LOCATIONS IN THE PATH INCLUDE INDIAN MOUND...CUMBERLAND CITY...
PALMYRA...WOODLAWN...CUNNINGHAM AND CLARKSVILLE.

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

LAT...LON 3642 8723 3630 8767 3649 8775 3665 8745
      3665 8730

11

Special weather statement, Apr 2, 3:23 PM CDT, 46 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
323 PM CDT THU APR 2 2015

TNZ024-025-057-022115-
DICKSON-HICKMAN-HUMPHREYS-
323 PM CDT THU APR 2 2015

...SIGNIFICANT WEATHER ADVISORY FOR DICKSON...HICKMAN AND HUMPHREYS
COUNTIES...

AT 321 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM NEAR HURRICANE MILLS...MOVING EAST AT 40 MPH.

SOME LOCATIONS IN THE PATH INCLUDE BUCKSNORT...PINEWOOD...NUNNELLY...
LYLES...BON AQUA...DICKSON AND BURNS.

PENNY SIZE HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3615 8731 3589 8721 3585 8722 3577 8772
      3584 8772 3584 8776 3594 8780

ROSE

Special weather statement, Apr 2, 4:05 PM CDT, 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
405 PM CDT THU APR 2 2015

TNZ025-026-022130-
CHEATHAM-DICKSON-
405 PM CDT THU APR 2 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN CHEATHAM AND NORTHEAST
DICKSON COUNTIES...

AT 402 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM NEAR ASHLAND CITY...MOVING NORTHEAST AT 40 MPH.

SOME LOCATIONS IN THE PATH INCLUDE CHEATHAM DAM...ASHLAND CITY AND
PLEASANT VIEW.

PENNY SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3640 8701 3637 8698 3638 8695 3638 8691
      3637 8690 3633 8692 3626 8697 3617 8721
      3632 8730 3635 8728 3643 8708

SHAMBURGER

Special weather statement, Apr 2, 4:08 PM CDT, 1 minute before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
408 PM CDT THU APR 2 2015

TNZ006-007-026-022145-
CHEATHAM-MONTGOMERY-ROBERTSON-
408 PM CDT THU APR 2 2015

...SIGNIFICANT WEATHER ADVISORY FOR CHEATHAM...MONTGOMERY AND
ROBERTSON COUNTIES...

AT 405 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM NEAR CLARKSVILLE...MOVING EAST AT 45 MPH.

SOME LOCATIONS IN THE PATH INCLUDE CLARKSVILLE...ADAMS AND CEDAR
HILL.

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

HEAVY RAINFALL COULD CAUSE WATER TO RISE OVER ROADS AND FLOOD LOW
LYING AREAS. DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

LAT...LON 3635 8715 3635 8759 3639 8759 3665 8743
      3665 8680

AL

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 2, 5:06 AM CDT	Special Weather Statement	OHX	Clay, Jackson, Overton	39 min
Apr 2, 2:07 PM CDT	Special Weather Statement	OHX	Fentress	38 min
Apr 2, 2:50 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Humphreys, Perry	25 min
Apr 2, 3:21 PM CDT	Special Weather Statement	OHX	Montgomery	39 min
Apr 2, 3:23 PM CDT	Special Weather Statement	OHX	Hickman	52 min
Apr 2, 3:40 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Maury, Williamson	35 min
Apr 2, 4:05 PM CDT	Special Weather Statement	OHX	Cheatham	25 min
Apr 2, 4:08 PM CDT	Special Weather Statement	OHX	Montgomery	37 min
Apr 2, 4:31 PM CDT	Special Weather Statement	OHX	Robertson	44 min
Apr 2, 4:43 PM CDT	Special Weather Statement	OHX	Davidson	32 min
Apr 2, 5:11 PM CDT	Special Weather Statement	OHX	Sumner	49 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.