Alert archive / Tennessee / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 38, NWS Nashville, TN

March 23, 2011Marshall County, Maury County, Rutherford County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Mar 23, 2011, 6:42 PM CDT for Marshall County, Maury County, Rutherford County, Tennessee. It was in force for 34 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: Mar 23, 2011, 6:42 PM CDT (23:42 UTC)
Expired: Mar 23, 2011, 7:16 PM CDT
In force: 34 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Marshall County, TN, Maury County, TN, Rutherford County, TN

The radar

The Nashville radar (KOHX), 70 km from the middle of the area, began a volume at 23:45 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 watch it was issued in

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

Issued	Product	Office	Lasted
Mar 23, 4:06 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 11.7 hours before the alert went out and 56 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 999 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 301 m²/s²
0-3 km storm-relative helicity: 319 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.

693 
WUUS54 KOHX 232342
SVROHX
TNC117-119-149-240030-
/O.NEW.KOHX.SV.W.0038.110323T2342Z-110324T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
642 PM CDT WED MAR 23 2011

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL MAURY COUNTY IN MIDDLE TENNESSEE...
  EXTREME SOUTH CENTRAL RUTHERFORD COUNTY IN MIDDLE TENNESSEE...
  NORTHERN MARSHALL COUNTY IN MIDDLE TENNESSEE...

* UNTIL 730 PM CDT

* AT 637 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING ONE INCH DIAMETER HAIL...
  AND DAMAGING WINDS IN EXCESS OF 60 MPH. THE STORM WAS NEAR SPRING
  HILL...MOVING EAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CHAPEL HILL...

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM WEDNESDAY EVENING FOR
CENTRAL TENNESSEE.

&&

LAT...LON 3554 8697 3572 8693 3569 8663 3566 8663
      3568 8649 3565 8623 3566 8637 3564 8637
      3562 8640 3565 8642 3565 8663 3560 8664
      3559 8666 3558 8663 3549 8666
TIME...MOT...LOC 2342Z 280DEG 34KT 3562 8684

$$

FORECASTER:

04

2 follow-up statements

807 
WWUS54 KOHX 232348
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
648 PM CDT WED MAR 23 2011

TNC149-232357-
/O.CAN.KOHX.SV.W.0038.000000T0000Z-110324T0030Z/
RUTHERFORD TN-
648 PM CDT WED MAR 23 2011

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME SOUTH CENTRAL
RUTHERFORD COUNTY IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING REMAINS WEST THE WARNED AREA.

LAT...LON 3554 8697 3572 8693 3569 8663 3560 8664
      3559 8665 3558 8663 3557 8665 3555 8665
      3549 8666
TIME...MOT...LOC 2347Z 280DEG 34KT 3561 8678

$$

TNC117-119-240030-
/O.CON.KOHX.SV.W.0038.000000T0000Z-110324T0030Z/
MAURY TN-MARSHALL TN-
648 PM CDT WED MAR 23 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
MARSHALL AND EAST CENTRAL MAURY COUNTIES UNTIL 730 PM CDT...

AT 645 PM CDT THE STORM WAS LOCATED 11 MILES SOUTHEAST OF SPRING 
HILL...OR 12 MILES NORTH OF LEWISBURG...MOVING EAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  CHAPEL HILL.

LAT...LON 3554 8697 3572 8693 3569 8663 3560 8664
      3559 8665 3558 8663 3557 8665 3555 8665
      3549 8666
TIME...MOT...LOC 2347Z 280DEG 34KT 3561 8678

$$

04

412 
WWUS54 KOHX 240016
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
716 PM CDT WED MAR 23 2011

TNC117-119-240026-
/O.CAN.KOHX.SV.W.0038.000000T0000Z-110324T0030Z/
MAURY TN-MARSHALL TN-
716 PM CDT WED MAR 23 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN MARSHALL AND EAST
CENTRAL MAURY COUNTIES IS CANCELLED...

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

LAT...LON 3554 8697 3572 8693 3569 8663 3560 8664
      3559 8665 3558 8663 3557 8665 3555 8665
      3549 8666
TIME...MOT...LOC 0016Z 280DEG 34KT 3556 8645

$$

04

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 23, 6:32 PM CDT, 10 minutes earlier.

Area forecast discussion, Mar 23, 6:32 PM CDT, 10 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
632 PM CDT WED MAR 23 2011

.AVIATION...BNA/CSV...THE 00Z TAF'S ARE OUT. LINE OF TS HAS MOVED
THROUGH BNA, W/ VCNTY SHOWERS EARLY THIS EVENING, THEN MOVING OUT.
EARLY EVENING TSRA STILL EXPECTED AT CSV, FOLLOWED BY IFR CIGS
LATER TONIGHT AS WRAP-AROUND MOISTURE MOVES INTO THE MID STATE.
LOW CLOUDS EXPECTED AT BNA, TOO, BUT SHOULD STAY VFR. WINDS WILL
SHIFT AROUND TO THE NW WITH THE FROPA THIS EVENING, W/ WINDS
GRADUALLY DIMINISHING TMRW.

&&

.PREV DISCUSSION... /ISSUED 502 PM CDT WED MAR 23 2011/

AVIATION...BNA/CSV...HAVE AMENDED THE TAF'S TO REFLECT CURRENT
MESOSCALE SITUATION. CDFNT IS STILL NW OF THE MID STATE, BUT MAIN
LINE OF CONVECTION HAS FORMED AHEAD OF THE SFC BNDRY, WITH TSRA
EXPECTED TO MOVE INTO THE BNA AREA BEFORE 23Z, AND CSV 23-01Z.
CELL MOVEMENT IS RAPID, WITH CURRENT STORMS TRACKING EASTWARD AT
50-60 MPH.

PREV DISCUSSION... /ISSUED 324 PM CDT WED MAR 23 2011/

DISCUSSION...
SCATTERED STRONG TO SEVERE STORMS DEVELOPED THIS AFTERNOON MAINLY
OVER NORTHEAST QUARTER OF MIDDLE TN WHERE RH AND INSTABILITY ARE
BEST. STORMS ARE ABSOLUTELY HAULING EASTWARD IN EXCESS OF 65 MPH
AS BAND OF STRONG MID/UPPER LEVEL WINDS SOUTH OF THE MAIN UPPER
LOW IMPACT THE REGION. AS EXPECTED...A SECOND AREA OF STORMS HAS
BEEN DEVELOPING OVER WEST TN SLIGHTLY AHEAD OF THE COLD FRONT
WHICH WAS STILL WEST OF THE MS RIVER AT 20Z. THESE STORMS ARE IN
AN AREA OF BETTER MID LEVEL LAPSE RATES AND DECENT SHEAR...BUT
ALSO SLIGHTLY LESS RH AND HAVE BEEN SLOW TO INTENSIFY/EXPAND. THIS
BAND WILL MOVE THRU MIDDLE TN THIS EVENING...WITH THREAT ENDING IN
THE NORTHWEST COUNTIES AROUND 22Z AND THE EAST COUNTIES BY 03Z.

MUCH COOLER TOMORROW AND REMAINING COOL FRIDAY AS SFC RIDGE
SETTLES IN OVER THE AREA. HOWEVER...RAIN CHANCES WILL INCREASE
AGAIN FRI AFTERNOON/NIGHT AS A WEAK S/W TRAVELS EASTWARD IN THE
ZONAL FLOW ALOFT WHILE SFC RIDGE MOVES EAST AND ALLOWS FOR SOME
MOISTURE RETURN. AS A SFC LOW APPROACHES TN ON SATURDAY...AN
IMPORTANT ISSUE WILL BE THE LOCATION OF THE RETURNING WARM FRONT.
GFS AND ECMWF BOTH HINT AT A VERY SLOW MOVING OR NEARLY STALLED
FRONT BEING IN OUR VCNTY THIS WEEKEND. ECMWF SHOWS THE FRONT JUST
S OF TN WHILE GFS STALLS ITS WEST TO EAST THRU THE SPINE OF TN.
EITHER WAY...PRECIP CHANCES WILL CONTINUE OVER THE WEEKEND WITH
POTENTIAL FOR ENHANCED RAINFALL DEPENDING ON THE FRONT. BOTH
MODELS SHOW SFC LOW PASSING MIDDLE TN BY THE END OF THE WEEKEND
WITH COOLER AIR MOVING IN BEHIND THE DEPARTED LOW.

BOTH EXTENDED MODELS HAVE DAMPENED THE PREVIOUSLY SIGNIFICANT TROF
THAT WAS EXPECTED TO MOVED THROUGH THE SOUTHERN U.S. MON AND TUE.
ALTHOUGH A WEAKER SYSTEM WILL POSE LESS SVR THREAT...IT WILL STILL
BE ENOUGH TO WARRANT CHC TYPE POPS THRU MON. TUE/WED APPEAR DRY
BUT REMAINING COOL BECAUSE UPPER TROF MOVES AWAY WHILE A STRONGER
SFC RIDGE SINKS INTO OUR REGION.

ACCEPTED SHORT TERM MODEL GUIDANCE WITH ONLY SMALL CHANGES TO
TEMPS AND POPS. THE BIGGEST POP/TEMP UNCERTAINTIES OCCUR THIS
WEEKEND DEPENDING ON THE WARM FRONT LOCATION ADDRESSED ABOVE. LV

&&

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

ROSE

Hazardous weather outlook, Mar 23, 4:31 PM CDT, 2 hours 11 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE NASHVILLE TN
431 PM CDT WED MAR 23 2011

TNZ005>011-022>034-056>066-075-077>080-093>095-242145-
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-
431 PM CDT WED MAR 23 2011

...A TORNADO WATCH IS IN EFFECT UNTIL 10 PM CDT FOR ALL OF MIDDLE
TENNESSEE...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TONIGHT

SEVERE THUNDERSTORMS...AND EVEN AN ISOLATED TORNADO OR TWO...WILL
BE POSSIBLE EARLY TONIGHT. THE MAIN THREATS HOWEVER WILL BE DAMAGING
WINDS AND LARGE HAIL ONE INCH OR LARGER. A COLD FRONT WILL MOVE
RAPIDLY SOUTHEAST ACROSS THE AREA LATER TONIGHT...WHICH WILL BRING
AN END TO THE SEVERE WEATHER THREAT.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

EVEN THOUGH ANY SEVERE THUNDERSTORMS ARE EXPECTED TO BE BRIEF AND
ISOLATED...SPOTTERS ARE ENCOURAGED TO CLOSELY MONITOR WEATHER
CONDITIONS AND BE PREPARED TO CALL IN ANYTHING REACHING REPORTING
CRITERIA.

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

STEIGERWALDT

In the hours before

Special weather statement, Mar 23, 5:17 PM CDT, 1 hour 25 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
517 PM CDT WED MAR 23 2011

TNZ008-025>029-232315-
CHEATHAM-DAVIDSON-DICKSON-SUMNER-TROUSDALE-WILSON-
517 PM CDT WED MAR 23 2011

...SIGNIFICANT WEATHER ADVISORY FOR CHEATHAM...DAVIDSON...DICKSON...
SUMNER...TROUSDALE AND WILSON COUNTIES...

AT 513 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM GALLATIN TO ASHLAND
CITY...MOVING EAST AT 45 MPH.

SMALL HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THESE STORMS.

04

Local storm report, Mar 23, 5:45 PM CDT, 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
545 PM CDT WED MAR 23 2011

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

0542 PM     HAIL             9 W LEBANON             36.21N 86.48W
03/23/2011  E1.00 INCH       WILSON             TN   NWS EMPLOYEE

            REPORTED NEAR WEST WILSON SCHOOL ON LEBANON ROAD.

&&

TJ

Special weather statement, Mar 23, 5:56 PM CDT, 46 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
556 PM CDT WED MAR 23 2011

TNZ027-062-240000-
DAVIDSON-RUTHERFORD-
556 PM CDT WED MAR 23 2011

...SIGNIFICANT WEATHER ADVISORY FOR DAVIDSON AND RUTHERFORD
COUNTIES...

AT 553 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR BELLE MEADE...OR 7 MILES WEST OF
NASHVILLE...MOVING EAST AT 30 MPH.

NICKEL SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS
STORM ACROSS METRO NASHVILLE THROUGH 615 PM CDT.

TJ

Local storm report, Mar 23, 5:59 PM CDT, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
559 PM CDT WED MAR 23 2011

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

0558 PM     HAIL             4 SE NASHVILLE          36.13N 86.73W
03/23/2011  E0.88 INCH       DAVIDSON           TN   TRAINED SPOTTER

            OCCURRING AT I-40 AND STEWARTS FERRY PIKE.

&&

TJ

Local storm report, Mar 23, 6:38 PM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
638 PM CDT WED MAR 23 2011

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

0620 PM     TSTM WND DMG     2 SE WATERTOWN          36.08N 86.11W
03/23/2011                   WILSON             TN   NWS EMPLOYEE

            BARN BLOWN DOWN ON OLD ALEXANRIA ROAD. EMA EN ROUTE TO
            SURVEY DAMAGE.

&&

TJ

Local storm report, Mar 23, 6:42 PM CDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
642 PM CDT WED MAR 23 2011

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

0641 PM     HAIL             3 W JAMESTOWN           36.43N 84.99W
03/23/2011  E1.00 INCH       FENTRESS           TN   AMATEUR RADIO

&&

TJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 23, 1:45 PM CDT	Severe Thunderstorm Warning	OHX	Fentress, Pickett	15 min
Mar 23, 2:04 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland, DeKalb, Putnam, White	26 min
Mar 23, 2:07 PM CDT	Severe Thunderstorm Warning	OHX	Fentress, Pickett	23 min
Mar 23, 2:28 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland	22 min
Mar 23, 2:47 PM CDT	Severe Thunderstorm Warning	OHX	Fentress	13 min
Mar 23, 5:30 PM CDT	Severe Thunderstorm Warning	OHX	Clay, Jackson, Macon, Overton	60 min
Mar 23, 5:37 PM CDT	Severe Thunderstorm Warning	OHX	Trousdale, Wilson	23 min
Mar 23, 6:03 PM CDT	Severe Thunderstorm Warning	OHX	DeKalb, Smith, Wilson	27 min
Mar 23, 6:11 PM CDT	Tornado Warning	OHX	DeKalb, Smith, Wilson	34 min
Mar 23, 6:15 PM CDT	Severe Thunderstorm Warning	OHX	Clay, Fentress, Overton, Pickett	30 min
Mar 23, 6:40 PM CDT	Severe Thunderstorm Warning	OHX	Cannon, DeKalb, Rutherford, Wilson	35 min
Mar 23, 6:44 PM CDT	Severe Thunderstorm Warning	OHX	Fentress	16 min
Mar 23, 6:51 PM CDT	Tornado Warning	OHX	Rutherford	24 min
Mar 23, 6:52 PM CDT	Tornado Warning	OHX	DeKalb, White	23 min
Mar 23, 6:59 PM CDT	Tornado Warning	OHX	Giles	31 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2011 Every severe thunderstorm warning in 2011

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.