Alert archive / Tennessee / Tornado Warnings in 2009

Tornado Warning 95, NWS Nashville, TN

July 4, 2009Cheatham County, Montgomery County, Robertson County, Tennessee

NWS Nashville, TN issued this tornado warning at Jul 4, 2009, 7:21 PM CDT for Cheatham County, Montgomery County, Robertson County, Tennessee. It was in force for 39 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: Jul 4, 2009, 7:21 PM CDT (00:21 UTC)
Expired: Jul 4, 2009, 8:00 PM CDT
In force: 39 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Cheatham County, TN, Montgomery County, TN, Robertson County, TN

What was reported inside it

Time	Report	Where	Remark
Jul 4, 7:30 PM CDT	TSTM WND DMG	7 S Clarksville, TN	TREES WERE BLOWN DOWN SOUTH OF CLARKSVILLE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jul 4, 5:56 PM CDT	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 0.4 hours before the alert went out and 64 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: 238 J/kg
Mixed-layer CIN: -104 J/kg
Mixed-layer LCL: 1204 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 297 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KOHX 050021
TOROHX
TNC021-125-147-050100-
/O.NEW.KOHX.TO.W.0095.090705T0021Z-090705T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
721 PM CDT SAT JUL 4 2009

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN CHEATHAM COUNTY IN MIDDLE TENNESSEE...
  MONTGOMERY COUNTY IN MIDDLE TENNESSEE...
  THIS INCLUDES THE CITY OF CLARKSVILLE...
  WESTERN ROBERTSON COUNTY IN MIDDLE TENNESSEE...

* UNTIL 800 PM CDT

* AT 718 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 8 MILES
  SOUTHWEST OF CLARKSVILLE...MOVING EAST AT 50 MPH. 

* THE TORNADO WILL BE NEAR...
  CLARKSVILLE BY 725 PM CDT...
  COOPERSTOWN BY 730 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT
SATURDAY EVENING FOR CENTRAL TENNESSEE.

&&

LAT...LON 3634 8691 3635 8758 3665 8756 3666 8690
TIME...MOT...LOC 0019Z 270DEG 41KT 3650 8745

$$

BOYD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 7:53 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Robertson, Sumner	37 min
Jul 4, 9:31 PM CDT	Areal Flood Advisory	OHX	Davidson	3 hr
Jul 4, 11:03 PM CDT	Areal Flood Advisory	OHX	Benton, Humphreys	3 hr
Jul 5, 1:05 AM CDT	Flash Flood Warning	OHX	Hickman, Lewis, Perry	115 min
Jul 5, 1:15 AM CDT	Severe Thunderstorm Warning	OHX	Lawrence, Lewis, Perry, Wayne	30 min
Jul 5, 3:19 AM CDT	Areal Flood Advisory	OHX	Giles, Lawrence, Wayne	3 hr
Jul 5, 4:07 AM CDT	Flash Flood Warning	OHX	Hickman, Lewis, Perry, Wayne	83 min
Jul 5, 4:20 AM CDT	Flash Flood Warning	OHX	Lawrence	85 min
Jul 5, 4:53 AM CDT	Areal Flood Advisory	OHX	Giles, Lawrence, Lewis, Marshall, Maury	3 hr
Jul 5, 3:10 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Maury, Williamson	35 min
Jul 5, 3:39 PM CDT	Areal Flood Advisory	OHX	Lewis, Perry, Wayne	3 hr
Jul 5, 4:14 PM CDT	Flash Flood Warning	OHX	Wayne	91 min

Nearby

Tornado Warnings in Tennessee, 2009 Every tornado warning in 2009 Tornadoes 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.