Alert archive / Tennessee / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 141, NWS Nashville, TN

May 6, 2012Coffee County, Rutherford County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at May 6, 2012, 4:22 PM CDT for Coffee County, Rutherford County, Tennessee. It was in force for 23 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: May 6, 2012, 4:22 PM CDT (21:22 UTC)
Expired: May 6, 2012, 4:45 PM CDT
In force: 23 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Coffee County, TN, Rutherford County, TN

The radar

The Nashville radar (KOHX), 63 km from the middle of the area, began a volume at 21:23 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

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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, 9.4 hours before the alert went out and 53 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: 81 J/kg
Mixed-layer CIN: -176 J/kg
Mixed-layer LCL: 1612 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

633 
WUUS54 KOHX 062122
SVROHX
TNC031-149-062145-
/O.NEW.KOHX.SV.W.0141.120506T2122Z-120506T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
422 PM CDT SUN MAY 6 2012

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN RUTHERFORD COUNTY IN MIDDLE TENNESSEE...
  NORTHWESTERN COFFEE COUNTY IN MIDDLE TENNESSEE...

* UNTIL 445 PM CDT

* AT 417 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING ONE INCH DIAMETER HAIL.
  THE STORM WAS NEAR MURFREESBORO...MOVING SOUTH AT 5 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  MURFREESBORO

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE...1 8 7 7 6 3 3 6 7 7 2. DO NOT
STAY OUTDOORS IF YOU ARE IN THE PATH OF SEVERE THUNDERSTORMS.

&&

LAT...LON 3581 8652 3589 8639 3579 8619 3571 8621
      3566 8614 3563 8624 3565 8630 3566 8631
      3566 8634 3565 8637 3562 8640
TIME...MOT...LOC 2122Z 339DEG 4KT 3577 8638

$$

TB12

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 May 6, 3:52 PM CDT, 30 minutes earlier.

Area forecast discussion, May 6, 3:52 PM CDT, 30 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
352 PM CDT SUN MAY 6 2012

.SHORT TERM (THRU TUE)...
ANOTHER MCS/MCV TYPE SYSTEM MOVED SOUTH OVR MID TN THIS MORNING
TO NEAR THE GULF COAST THIS AFTN. THE STALLED FRONT IN WEST MID
TN HAS DRIFTED EAST BUT IS MORE DIFFUSE...WITH SOME AREAS OF
MODERATE DESTAB DRIVING ISOLATED ACTIVITY.

MOST OF THE MODEL INSTAB THIS EVENING IS ALIGNED NEAR THE FRONT FM
I-65 WEST...WITH ISO-SCT STORMS EXPECTED. STORM MOTION IS SOUTH AS
PER CORFIDI VECTORS.

SFC LOW PRES WL GET BETTER ORGANIZED IN MO-IL TNGT WHERE MOST OF
THE STORM ACTIVITY WL BE. THE QUASI-STATIONARY FRONT IN WEST MID
TN WL LIFT NORTH AS A WARM FRONT OVERNIGHT. WL KEEP A CHANCE OF
SHOWERS AND THUNDERSTORMS OVERNIGHT.

MON-MON NGT...SFC LOW PRES/COLD FRONT WL APPROACH FM THE NORTHWEST
IN THE AFTN. THE CHANCE OF SHOWERS AND THUNDERSTORMS WL INCREASE
TO LKLY WEST OF THE PLATEAU. SPC HAS A SLIGHT RISK OF SEVERE
WEATHER ACROSS MOST OF THE AREA MON-MON NGT. H8 WINDS AHEAD OF THE
FRONT ARE NOT PARTICULARILY STRONG...WITH WEAK SHEAR.

IF A LINE OF STORMS DEVELOPS DAMAGING WINDS AND LARGE HAIL WILL BE
POSSIBLE...MAINLY MON AFTN-EVE. THE COLD FRONT SHOULD CROSS THE
AREA TUE MORNING...WITH LINGERING SHOWERS ACROSS THE REGION

.LONG TERM (WED-SAT)...
MODELS CONTINUE TO SHOW MUCH IMPROVED WEATHER WED-FRI. WL CONTINUE
THE TREND INTO SAT. TEMPS DURING THE PERIOD WL PROBABLY DIP BELOW
NORMAL WED-THU...TO NEAR NORMAL FRI. WARMER TEMPS AND MORE
MOISTURE NEXT WEEKEND...WITH A CHANCE OF SHOWERS.

&&

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      67  86  64  78 /  20  70  80  50
CLARKSVILLE    65  85  63  76 /  20  70  80  20
CROSSVILLE     61  80  61  76 /  20  40  70  60
COLUMBIA       67  86  64  78 /  30  70  70  40
LAWRENCEBURG   63  86  63  79 /  30  70  70  40
WAVERLY        66  86  64  76 /  30  70  70  20

&&

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

04

Hazardous weather outlook, May 6, 5:24 AM CDT, 10 hours 58 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
524 AM CDT SUN MAY 6 2012

TNZ005>011-022>034-056>066-075-077>080-093>095-071030-
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-
524 AM CDT SUN MAY 6 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

WITH A WEAK SURFACE BOUNDARY REMAINING OVER THE AREA...ISOLATED
STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE TODAY AND TONIGHT.
STORMS MAY PRODUCE HAIL UP TO ONE INCH AND GUSTY TO DAMAGING
WIND.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY...

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR ALL OF
MIDDLE TENNESSEE LATER MONDAY INTO EARLY TUESDAY AS A COLD
FRONT MOVES INTO THE REGION. SEVERE STORMS MAY PRODUCE DAMAGING
WINDS AND LARGE HAIL.

.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

07

In the hours before

Special weather statement, May 6, 3:51 PM CDT, 31 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
351 PM CDT SUN MAY 6 2012

TNZ005-006-062115-
MONTGOMERY-STEWART-
351 PM CDT SUN MAY 6 2012

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

AT 349 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 8 MILES SOUTHWEST OF FORT CAMPBELL NORTH...MOVING
SOUTHWEST AT 5 MPH.

SMALL HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS STORM. AN
OCCASIONAL CLOUD TO GROUND LIGHTNING STRIKE WILL ALSO BE POSSIBLE.

LAT...LON 3665 8731 3636 8726 3637 8759 3654 8771
      3664 8764

TB12

Local storm report, May 6, 4:14 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
414 PM CDT SUN MAY 06 2012

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

0411 PM     HAIL             CLARKSVILLE             36.56N 87.35W
05/06/2012  E0.88 INCH       MONTGOMERY         TN   TRAINED SPOTTER

&&

ROSE

The office that day

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

Issued	Product	Office	Counties	Lasted
May 6, 12:48 AM CDT	Special Weather Statement	OHX	Benton, Houston, Humphreys, Perry, Stewart	57 min
May 6, 1:53 AM CDT	Severe Thunderstorm Warning	OHX	Houston, Humphreys	48 min
May 6, 1:56 AM CDT	Severe Thunderstorm Warning	OHX	Houston, Stewart	27 min
May 6, 2:32 AM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Dickson, Montgomery	28 min
May 6, 3:06 AM CDT	Special Weather Statement	OHX	Bedford, Benton, Cheatham, Davidson, Dickson, Hickman and 15 more	54 min
May 6, 4:50 AM CDT	Special Weather Statement	OHX	Bedford, Cannon, Coffee, Giles, Hickman, Lawrence and 6 more	55 min
May 6, 5:39 AM CDT	Special Weather Statement	OHX	Stewart	66 min
May 6, 3:51 PM CDT	Special Weather Statement	OHX	Montgomery	24 min
May 6, 4:10 PM CDT	Severe Thunderstorm Warning	OHX	Montgomery	35 min
May 6, 4:16 PM CDT	Severe Thunderstorm Warning	OHX	Davidson	29 min
May 6, 4:34 PM CDT	Special Weather Statement	OHX	Williamson	26 min
May 6, 4:40 PM CDT	Special Weather Statement	OHX	Robertson	35 min
May 6, 4:51 PM CDT	Severe Thunderstorm Warning	OHX	Houston, Montgomery, Stewart	24 min
May 6, 4:54 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Robertson, Sumner	36 min
May 6, 4:57 PM CDT	Severe Thunderstorm Warning	OHX	Robertson	33 min
May 6, 5:03 PM CDT	Special Weather Statement	OHX	Rutherford	57 min
May 6, 5:22 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Sumner, Wilson	23 min
May 6, 5:28 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Robertson, Sumner	32 min
May 6, 5:45 PM CDT	Severe Thunderstorm Warning	OHX	Coffee, Grundy	30 min
May 6, 5:58 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Williamson	32 min
May 6, 6:48 PM CDT	Severe Thunderstorm Warning	OHX	Williamson	27 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.