Alert archive / Tennessee / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 94, NWS Nashville, TN

March 31, 2012Cumberland County, Van Buren County, White County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Mar 31, 2012, 2:08 PM CDT for Cumberland County, Van Buren County, White County, Tennessee. It was in force for 17 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: Mar 31, 2012, 2:08 PM CDT (19:08 UTC)
Expired: Mar 31, 2012, 2:25 PM CDT
In force: 17 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Cumberland County, TN, Van Buren County, TN, White County, TN

The radar

The Northeast Alabama radar (KHTX), 128 km from the middle of the area, began a volume at 19:11 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
Mar 31, 2:11 PM CDT	HAIL 1.75	3 E Sparta, TN

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 31, 12:47 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 7.1 hours before the alert went out and 130 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: 1321 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 509 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 52 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

295 
WUUS54 KOHX 311908
SVROHX
TNC035-175-185-311945-
/O.NEW.KOHX.SV.W.0094.120331T1908Z-120331T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
208 PM CDT SAT MAR 31 2012

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN VAN BUREN COUNTY IN MIDDLE TENNESSEE...
  EASTERN WHITE COUNTY IN MIDDLE TENNESSEE...
  SOUTHWESTERN CUMBERLAND COUNTY IN MIDDLE TENNESSEE...

* UNTIL 245 PM CDT

* AT 207 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THE
  STORM WAS NEAR SPARTA...MOVING SOUTHEAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  RURAL SOUTHEASTERN WHITE COUNTY...
  RURAL SOUTHWESTERN CUMBERLAND COUNTY...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CONTAIN DAMAGING WINDS 58 MPH OR STRONGER...OR
HAIL ONE INCH OR LARGER. FOR YOUR SAFETY...TAKE SHELTER INSIDE A
BUILDING LOCATION NOW.

&&

LAT...LON 3574 8502 3575 8504 3576 8504 3576 8523
      3576 8526 3572 8526 3570 8528 3590 8549
      3602 8533 3601 8531 3599 8530 3598 8526
      3577 8494
TIME...MOT...LOC 1908Z 315DEG 14KT 3590 8533

$$

FORECASTER: ROSE

1 follow-up statement

560 
WWUS54 KOHX 311925
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
225 PM CDT SAT MAR 31 2012

TNC035-175-185-311935-
/O.CAN.KOHX.SV.W.0094.000000T0000Z-120331T1945Z/
VAN BUREN TN-WHITE TN-CUMBERLAND TN-
225 PM CDT SAT MAR 31 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CUMBERLAND...
EASTERN WHITE AND NORTHEASTERN VAN BUREN COUNTIES IS CANCELED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

LAT...LON 3574 8502 3575 8504 3576 8504 3576 8523
      3576 8526 3572 8526 3570 8528 3590 8549
      3602 8533 3601 8531 3599 8530 3598 8526
      3577 8494
TIME...MOT...LOC 1925Z 315DEG 14KT 3585 8527

$$

ROSE

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 Mar 31, 1:07 PM CDT, 1 hour 1 minute earlier.

Area forecast discussion, Mar 31, 1:07 PM CDT, 1 hour 1 minute before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
107 PM CDT SAT MAR 31 2012

.MESOSCALE UPDATE...
SEVERE TSTM WATCH IN EFFECT UNTIL 9 PM CDT FOR MID TN WITH THE
EXCEPTION OF THE FAR NORTHERN COUNTTES. LARGE HAIL THE PRIMARY
THREAT WITH AREA OF STORMS SOUTH OF I-40...SIZE UP TO GOLF BALLS.
SOME ACTIVITY MAY DEVELOP NORTH OF I-40 AROUND MID AFTERNOON...
BUT BULK OF ACTIVITY SHOULD BE SOUTH.

&&

.PREV DISCUSSION... /ISSUED 1245 PM CDT SAT MAR 31 2012/

UPDATE...ADDED AVIATION SECTION FOR 18Z TAF'S.

AVIATION...BNA/CKV/CSV...CONVECTION STARTING TO FIRE ALONG A
SURFACE BOUNDARY THAT LIES ROUGHLY ALONG THE I-40 CORRIDOR ACROSS
MIDDLE TENNESSEE. LOW CIGS AT CSV SHOULD BE GONE BY 20Z, ALTHOUGH
THERE WILL BE VCTS AND CB'S AROUND BNA AND CSV DURING THE EARLY
AFTERNOON, EVEN THOUGH MOST OF THE CONVECTION WILL OCCUR JUST TO
THE SOUTH. LOOK FOR SKIES TO CLEAR OUT BY EVENING, WITH FOG
DEVELOPING OVERNIGHT.

PREV DISCUSSION... /ISSUED 1150 AM CDT SAT MAR 31 2012/

MESOSCALE UPDATE...
COLD FRONT HAS PUSHED SOUTH OF I-40 WITH DRIER AIR...AND HIGHER
CONVECTIVE TEMPS. EXPECT STORMS TO DEVELOP A LITTLE LATER IN THE
DAY...AROUND MID AFTERNOON. ISO COVERAGE NORTH OF I-40 AND
SCATTERED SOUTH.

PREV DISCUSSION... /ISSUED 905 AM CDT SAT MAR 31 2012/

MESOSCALE UPDATE...
RAOB/MODEL SOUNDINGS SHOW THAT STORMS ARE EXPECTED TO DEVELOP
WHEN TEMPS GET INTO THE MID-UPR 70S...SO A FEW HOURS AWAY. EXPECT
SCATTERED STORMS WITH THE PRIMARY THREAT LARGE HAIL...MAINLY WEST
OF I-24.

PREV DISCUSSION... /ISSUED 716 AM CDT SAT MAR 31 2012/

UPDATE...FOR 12Z AVIATION FORECAST

AVIATION...
VSBY QUICKLY LOWERED TO 2 1/2 SM AT BNA LAST FEW MINUTES. SHOULD
SEE IMPROVEMENT BY 13Z SINCE FOG IS NOT WIDESPREAD. IFR CONDITIONS
DUE PRIMARILY TO LOW CEILING WILL CONTINUE AT CSV BUT SHOULD SEE
IMPROVEMENT TO MVFR AFTER 15Z.

FRONTAL BOUNDAY ALONG THE OHIO RIVER BASED ON SURFACE LI'S OFF MSAS
AND SREF. BOUNDARY WILL SINK SOUTH AS WE GO THROUGH THE DAY. AM
EXPECTING ISOLATED TO SCATTERED CONVECTION TO DEVELOP IN MIDDLE
TENNESSEE MAINLY FROM MID-DAY THROUGH THE AFTERNOON WITH A FEW
STRONG STORMS POSSIBLE OVER SOUTHWESTERN MIDDLE TN. WINDS WILL
TURN TOWARD THE NORTHWEST WITH FROPA DURING THE AFTERNOON BUT
REMAIN LIGHT EXCEPT NEAR CONVECTION. EXCELLENT FLYING WEATHER ON
SUNDAY WITH VFR CONDITIONS ACROSS THE AREA.

BOYD

PREV DISCUSSION... /ISSUED 327 AM CDT SAT MAR 31 2012/

DISCUSSION...
WEAK SFC LOW/COLD FRONT CURRENTLY HOLDING N OF THE CWA AS SHORTWAVES
PASS N AND S IN UPPER TROUGH. ISO STORMS AHEAD OF BOUNDARY CROSSING
KY/TN BORDER EXPECTED TO AFFECT NE THIS MORNING BUT ALSO LEAVE
OUTFLOW ACROSS THE MID-STATE. WHILE MOISTURE BECOMES MORE SHALLOW
LATER TODAY...SECONDARY PASSING SHORTWAVE/IMPULSE WILL PUSH COLD
FRONT S...INTERACTING WITH OUTFLOW/GOOD INSTABILITY/MARGINAL SHEAR
IN PLACE. DEVELOPING STORMS TODAY/THIS EVENING MOST LIKELY SW
WHERE INGREDIENTS SUFFICIENT FOR ISO STORMS TO REACH SEVERE
LIMITS...PRODUCING LARGE HAIL AND/OR DAMAGING WIND.

LATER TONIGHT BEHIND SHORTWAVE...UPPER RIDGE WILL START BUILDING WHICH
ALONG WITH WEAK SFC HIGH EFFECTIVELY HELPS WASH OUT FRONT BOUNDARY.
THIS WILL LARGELY BRING A DRY PERIOD SUN THROUGH EARLY TUES ALTHOUGH
THERE MAY BE A FEW ISO STORMS PLATEAU LATE MON AND AREA-WIDE MON
NIGHT.

BY 12Z TUES...CLOSED UPPER LOWS SHOWING UP ACROSS THE PLAINS WITH A
COLD FRONT SITTING N/W. THIS FRONT WILL STAY JUST N THROUGH WED MORNING
WHILE UPPER LOWS MAKE VERY LITTLE EWARD PROGRESS. INSTABILITY AND
WEAK MOISTURE SOURCES WILL BE PRESENT HOWEVER SO THAT SCT STORMS
ARE EXPECTED TO DEVELOP TUES/TUES NIGHT.

SAME SORT OF SETUP WORKING WED AS UPPER LOWS WOBBLE OUT OF THE PLAINS.
BIGGER DIFFERENCES IN POSITION OF UPPER LOWS SHOWING UP WED
ALTHOUGH THERE IS AGREEMENT ON MORE AVAILABLE MOISTURE....WHICH
WILL KEEP AT LEAST SCT STORMS FLOATING AROUND.

UPPER LOW/TROUGH CONTINUES TO INFLUENCE WED NIGHT THROUGH THU NIGHT
BEFORE FINALLY MOVING E EARLY FRI. MOISTURE THROUGH THIS PERIOD A BIT
MORE LIMITED BUT SHWRS/STORMS EXPECTED TO REMAIN AT LEAST ISO. STORMS
MAY BE SLIGHTLY MORE NUMEROUS WED NIGHT HOWEVER AS WEAK FRONT MOVES
INTO THE MID-SOUTH.

UPPER RIDGE BEHIND EXITING UPPER LOWS PROVIDING DRY CONDITIONS FRI-SAT.

&&

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

04

Hazardous weather outlook, Mar 31, 11:49 AM CDT, 2 hours 19 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
1149 AM CDT SAT MAR 31 2012

TNZ005>011-022>034-056>066-075-077>080-093>095-011700-
STEWART-MONTGOMERY-ROBERTSON-SUMNER-MACON-CLAY-PICKETT-BENTON-
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-
1149 AM CDT SAT MAR 31 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR ALL OF MIDDLE
TENNESSEE, WITH THE EXCEPTION OF THOSE AREAS NEAR THE KENTUCKY
STATE LINE AND THE UPPER PLATEAU.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.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

ROSE

In the hours before

Local storm report, Mar 31, 1:11 PM CDT, 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
111 PM CDT SAT MAR 31 2012

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

0109 PM     HAIL             5 S MURFREESBORO        35.78N 86.39W
03/31/2012  E1.75 INCH       RUTHERFORD         TN   TRAINED SPOTTER

&&

04

Local storm report, Mar 31, 1:38 PM CDT, 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
138 PM CDT SAT MAR 31 2012

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

0135 PM     HAIL             3 E COLUMBIA            35.62N 87.00W
03/31/2012  E0.25 INCH       MAURY              TN   TRAINED SPOTTER

0135 PM     HAIL             10 S MURFREESBORO       35.71N 86.39W
03/31/2012  E1.75 INCH       RUTHERFORD         TN   TRAINED SPOTTER

            GOLF BALL SIZED HAIL.

&&

04

Local storm report, Mar 31, 2:00 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
200 PM CDT SAT MAR 31 2012

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

0154 PM     HAIL             2 SE COLUMBIA           35.60N 87.02W
03/31/2012  M1.75 INCH       MAURY              TN   TRAINED SPOTTER

0146 PM     HAIL             3 E COLUMBIA            35.62N 87.00W
03/31/2012  M0.50 INCH       MAURY              TN   TRAINED SPOTTER

            HAIL REPORTED 3 MILES EAST OF COLUMBIA AT BEAR CREEK
            PIKE.

0121 PM     HAIL             6 S MURFREESBORO        35.77N 86.39W
03/31/2012  M0.50 INCH       RUTHERFORD         TN   TRAINED SPOTTER

&&

11

Local storm report, Mar 31, 2:08 PM CDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
208 PM CDT SAT MAR 31 2012

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

0203 PM     HAIL             5 E SPARTA              35.93N 85.38W
03/31/2012  E0.88 INCH       WHITE              TN   TRAINED SPOTTER

            REPORTED IN THE BON AIR COMMUNITY

&&

11

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 31, 1:04 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Rutherford	26 min
Mar 31, 1:15 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Marshall, Maury, Williamson	45 min
Mar 31, 1:25 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Rutherford	35 min
Mar 31, 1:55 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Coffee, Marshall, Maury, Rutherford	35 min
Mar 31, 2:01 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Marshall, Maury	29 min
Mar 31, 2:27 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Marshall, Maury	33 min
Mar 31, 2:29 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Coffee	16 min
Mar 31, 2:35 PM CDT	Severe Thunderstorm Warning	OHX	Marshall, Maury	25 min
Mar 31, 2:43 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland, Van Buren, White	17 min
Mar 31, 2:57 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Lawrence, Maury	48 min
Mar 31, 3:18 PM CDT	Flash Flood Warning	OHX	Giles	3 hr
Mar 31, 3:25 PM CDT	Special Weather Statement	OHX	Perry	35 min
Mar 31, 3:31 PM CDT	Severe Thunderstorm Warning	OHX	Perry, Wayne	29 min
Mar 31, 3:41 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Lawrence	49 min
Mar 31, 3:56 PM CDT	Tornado Warning	OHX	Giles	19 min
Mar 31, 3:58 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	32 min
Mar 31, 4:14 PM CDT	Tornado Warning	OHX	Giles	18 min
Mar 31, 4:23 PM CDT	Severe Thunderstorm Warning	OHX	Marshall, Maury	37 min
Mar 31, 4:28 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Lawrence	32 min
Mar 31, 4:35 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	25 min
Mar 31, 4:58 PM CDT	Severe Thunderstorm Warning	OHX	Marshall	32 min
Mar 31, 5:01 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	29 min
Mar 31, 5:12 PM CDT	Severe Thunderstorm Warning	OHX	Marshall	20 min
Mar 31, 5:19 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	26 min
Mar 31, 5:46 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	14 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2012 Every severe thunderstorm warning in 2012

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.