Alert archive / Tennessee / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 1, NWS Nashville, TN

February 11, 20095 counties in Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Feb 11, 2009, 10:46 AM CST for 5 counties in Tennessee. It was in force for 29 min. 5 reports 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: Feb 11, 2009, 10:46 AM CST (16:46 UTC)
Expired: Feb 11, 2009, 11:15 AM CST
In force: 29 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Dickson County, TN, Hickman County, TN, Lawrence County, TN, Lewis County, TN, Montgomery County, TN

The radar

The Nashville radar (KOHX), 87 km from the middle of the area, began a volume at 16:48 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
Feb 11, 10:53 AM CST	TSTM WND DMG	10 Sw Dickson, TN	SEVERAL TREES BLOWN DOWN. A COUPLE WERE SNAPPED.
Feb 11, 10:53 AM CST	TSTM WND GST 60	10 N Centerville, TN	TREE BLOWN DOWN.
Feb 11, 11:03 AM CST	TSTM WND GST 64	2 S Dickson, TN
Feb 11, 11:10 AM CST	TSTM WND DMG	3 W Lawrenceburg, TN	TREES DOWN BLOCKING HIGHWAY 64
Feb 11, 11:10 AM CST	TSTM WND DMG	Lawrenceburg, TN	ROOF BLOWN OFF HOME...NUMEROUS TREES DOWN.

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 5 storm reports to this severe thunderstorm warning; the first came 7 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, 4.8 hours before the alert went out and 78 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: 722 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 510 m²/s²
0-3 km storm-relative helicity: 444 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.

000 
WUUS54 KOHX 111646
SVROHX
TNC043-081-099-101-125-111715-
/O.NEW.KOHX.SV.W.0001.090211T1646Z-090211T1715Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
1046 AM CST WED FEB 11 2009

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DICKSON COUNTY IN MIDDLE TENNESSEE...
  HICKMAN COUNTY IN MIDDLE TENNESSEE...
  LAWRENCE COUNTY IN MIDDLE TENNESSEE...
  LEWIS COUNTY IN MIDDLE TENNESSEE...
  MONTGOMERY COUNTY IN MIDDLE TENNESSEE...

* UNTIL 1115 AM CST

* AT 1039 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
  IN EXCESS OF 70 MPH. THESE STORMS WERE LOCATED ALONG A LINE        
  EXTENDING FROM 13 MILES WEST OF CLARKSVILLE TO 18 MILES WEST OF    
  LORETTO...AND MOVING NORTHEAST AT 50 MPH.

* SEVERE THUNDERSTORMS WILL AFFECT AREAS AROUND CLARKSVILLE,         
  DICKSON, CENTERVILLE, HOHENWALD, AND LAWRENCEBURG...

WIND DAMAGE HAS ALREADY BEEN REPORTED IN MULTIPLE LOCATIONS ALONG 
THIS LINE OF STORMS. SEEK SAFE SHELTER AND STAY AWAY FROM WINDOWS

LAT...LON 3502 8761 3542 8757 3554 8768 3559 8764
      3591 8771 3598 8754 3634 8752 3665 8764
      3665 8711 3646 8712 3634 8728 3630 8713
      3626 8719 3618 8714 3574 8722 3562 8735
      3552 8726 3545 8729 3544 8721 3501 8723
TIME...MOT...LOC 1643Z 228DEG 15KT 3664 8756 3503 8774

$$

ROSE

2 follow-up statements

000 
WWUS54 KOHX 111704
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
1104 AM CST WED FEB 11 2009

TNC043-081-099-101-125-111715-
/O.CON.KOHX.SV.W.0001.000000T0000Z-090211T1715Z/
HICKMAN TN-DICKSON TN-MONTGOMERY TN-LEWIS TN-LAWRENCE TN-
1102 AM CST WED FEB 11 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 AM CST
FOR LAWRENCE...LEWIS...MONTGOMERY...DICKSON AND EASTERN HICKMAN
COUNTIES...

AT 1058 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED
ALONG A LINE EXTENDING FROM 7 MILES NORTHWEST OF CLARKSVILLE TO 
CENTERVILLE TO IRON CITY...MOVING EAST AT 50 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
DICKSON...CHARLOTTE...LORETTO...BURNS...WHITE BLUFF...GUTHRIE AND
ETHRIDGE

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

A STORM SPOTTER REPORTED WIND GUSTS AS HIGH AS 72 MPH IN HUMPHREYS 
COUNTY THAT DAMAGED A BARN...AS THE LINE OF STORMS MOVED THROUGH THE 
AREA. TREES ALSO WERE BLOWN DOWN EARLIER IN BENTON COUNTY. 

SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM 
WINDOWS

LAT...LON 3502 8761 3597 8750 3664 8748 3665 8711
      3646 8712 3634 8728 3630 8714 3626 8719
      3618 8714 3598 8721 3574 8722 3562 8735
      3552 8726 3545 8729 3544 8721 3501 8723
TIME...MOT...LOC 1700Z 250DEG 40KT 3665 8739 3579 8741
          3509 8754

$$
STEIGERWALDT

000 
WWUS54 KOHX 111713
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
1113 AM CST WED FEB 11 2009

TNC043-081-099-101-125-111721-
/O.EXP.KOHX.SV.W.0001.000000T0000Z-090211T1715Z/
HICKMAN TN-DICKSON TN-MONTGOMERY TN-LEWIS TN-LAWRENCE TN-
1111 AM CST WED FEB 11 2009

...THE SEVERE THUNDERSTORM WARNING FOR LAWRENCE...EASTERN LEWIS...
MONTGOMERY...DICKSON AND EASTERN HICKMAN COUNTIES WILL EXPIRE AT 1115
AM CST...

ALTHOUGH A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 PM CST WEDNESDAY
AFTERNOON FOR CENTRAL TENNESSEE...IT WILL LIKELY BE CANCELLED SOON 
FOR THE WEST PART OF THE AREA.  

LAT...LON 3502 8761 3597 8750 3664 8748 3665 8711
      3646 8712 3634 8728 3630 8714 3626 8719
      3618 8714 3598 8721 3574 8722 3562 8735
      3552 8726 3545 8729 3544 8721 3501 8723
TIME...MOT...LOC 1711Z 251DEG 40KT 3668 8723 3582 8726
          3512 8740

$$
STEIGERWALDT

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 Feb 11, 10:38 AM CST, 8 minutes earlier.

Area forecast discussion, Feb 11, 10:38 AM CST, 8 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
1038 AM CST WED FEB 11 2009

.DISCUSSION...
BAND OF SHOWERS/ISOLATED THUNDERSTORMS CONTINUES TO MOVE EAST JUST
AHEAD OF SURFACE FRONT...WHICH EXTENDS FROM CLOSED LOW NEAR STL. UPPER
SYSTEM CURRENTLY MAKING NEGATIVE TILT...WHICH IS EXPECTED TO ACCELERATE
BAND. TIGHT PRESSURE GRADIENT CONTINUES TO PRODUCE WIND GUSTS IN THE
40 TO 50 MPH WELL AHEAD OF PCPN.

LATEST RUNS SHOW LINE INTENSIFYING SOME OVER THE NORTH CENTRAL AND
NORTHEAST MID-STATE AS THE AFTERNOON PROGRESSES AND BAND OF PCPNS SPEED
INCREASES. TREMENDOUS DRYING ALSO SHOWING UP ON WV IMAGERY WHICH
MAY INITIALLY HELP TO INTENSIFY CONVECTION BEFORE SHUTTING IT OFF
LATER THIS AFTERNOON.

WILL CONTINUE WIND ADVISORY THROUGH 00Z AND MAKE ADJUSTMENTS TO
CURRENT FORECAST TO ACCOMMODATE TORNADO WATCH.

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
WIND ADVISORY UNTIL 6 PM CST THIS AFTERNOON FOR TNZ005>011-
022>034-056>066-075-077>080-093>095.

&&

07

Hazardous weather outlook, Feb 11, 4:08 AM CST, 6 hours 38 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
408 AM CST WED FEB 11 2009

TNZ005>011-022>034-056>066-075-077>080-093>095-121130-
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-DEKALB-WHITE-
CUMBERLAND-BEDFORD-COFFEE-WARREN-GRUNDY-VAN BUREN-WAYNE-LAWRENCE-
GILES-
408 AM CST WED FEB 11 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

A STRONG LOW PRESSURE SYSTEM AND COLD FRONT WILL BRING THE
POTENTIAL FOR DAMAGING WINDS AND ISOLATED TORNADOES TO MIDDLE
TENNESSEE TODAY.

A LINE OF THUNDERSTORMS IS EXPECTED TO APPROACH THE TENNESSEE
RIVER AROUND 9 AM. IT SHOULD REACH THE I 65 CORRIDOR BETWEEN 10
AM AND NOON...AND THE PLATEAU BY 2 PM. DAMAGING STRAIGHT LINE
WINDS WILL BE THE MAIN HAZARD. HOWEVER...FAVORABLE ATMOSPHERIC
WIND SPEEDS AND DIRECTIONS WILL BRING THE POTENTIAL FOR ISOLATED
TORNADOES.

WINDS WILL ALSO BE STRONG BEFORE AND AFTER THE THUNDERSTORMS.
WIND GUSTS OF 45 MPH WILL BE POSSIBLE THROUGH THE DAY. A WIND
ADVISORY WILL REMAIN IN EFFECT UNTIL 6 PM.

MORE INFORMATION IS AVAILABLE ON THE INTERNET AT WEATHER.GOV OR
BY LISTENING TO NOAA WEATHER RADIO.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER AND EMERGENCY MANAGER ACTIVATION WILL LIKELY BE NEEDED TODAY.

13

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 11, 11:05 AM CST	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Robertson, Williamson	55 min
Feb 11, 11:10 AM CST	Severe Thunderstorm Warning	OHX	Giles, Marshall, Maury	50 min
Feb 11, 11:34 AM CST	Severe Thunderstorm Warning	OHX	Davidson, Robertson, Sumner, Wilson	56 min
Feb 11, 11:39 AM CST	Severe Thunderstorm Warning	OHX	Bedford, Rutherford, Williamson	66 min
Feb 11, 12:01 PM CST	Tornado Warning	OHX	Marshall	14 min
Feb 11, 12:08 PM CST	Severe Thunderstorm Warning	OHX	Macon, Smith, Trousdale, Wilson	37 min
Feb 11, 12:24 PM CST	Severe Thunderstorm Warning	OHX	Cannon, Coffee, DeKalb	36 min
Feb 11, 12:46 PM CST	Tornado Warning	OHX	Cannon, Coffee, DeKalb, Warren	29 min
Feb 11, 12:50 PM CST	Severe Thunderstorm Warning	OHX	Clay, Jackson, Macon, Overton, Putnam, Smith	40 min
Feb 11, 12:58 PM CST	Severe Thunderstorm Warning	OHX	Cannon, Coffee, DeKalb, Grundy, Warren, White	32 min
Feb 11, 1:17 PM CST	Severe Thunderstorm Warning	OHX	Grundy, Van Buren, Warren, White	43 min
Feb 11, 1:24 PM CST	Severe Thunderstorm Warning	OHX	Clay, Overton, Pickett, Putnam	36 min
Feb 11, 1:41 PM CST	Severe Thunderstorm Warning	OHX	Cumberland, Fentress, Overton, Pickett, Putnam, Van Buren and 1 more	49 min
Feb 11, 1:59 PM CST	Tornado Warning	OHX	Cumberland, Fentress	31 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2009 Every severe thunderstorm warning in 2009

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.