Alert archive / Tennessee / Tornado Warnings in 2006

Tornado Warning 21, NWS Huntsville, AL

April 7, 2006Franklin County, Tennessee

NWS Huntsville, AL issued this tornado warning at Apr 7, 2006, 8:42 PM CDT for Franklin County, Tennessee. It was in force for 33 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: Apr 7, 2006, 8:42 PM CDT (01:42 UTC)
Expired: Apr 7, 2006, 9:15 PM CDT
In force: 33 min
Issued by: NWS Huntsville, AL
Area: Counties, with a storm outline in the text

County Franklin County, TN

The radar

The Northeast Alabama radar (KHTX), 13 km from the middle of the area, began a volume at 01:43 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.

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 7, 7:28 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 1.7 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: 310 J/kg
Mixed-layer CIN: -177 J/kg
Mixed-layer LCL: 1354 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 219 m²/s²
0-3 km storm-relative helicity: 272 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KHUN 080144
TORHUN
TNC051-080215-
/O.NEW.KHUN.TO.W.0021.060408T0142Z-060408T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HUNTSVILLE AL
842 PM CDT FRI APR 7 2006

THE NATIONAL WEATHER SERVICE IN HUNTSVILLE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEAST FRANKLIN COUNTY IN TENNESSEE

* UNTIL 915 PM CDT

* AT 840 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 7 MILES SOUTH OF
  SEWANEE...MOVING EAST AT 40 MPH. ANOTHER SEVERE THUNDERSTORM       
  CAPABLE OF PRODUCING DAMAGING WINDS WAS LOCATED JUST EAST OF       
  HUNTLAND.

* LOCATIONS NEAR THE PATH OF THIS TORNADO INCLUDE...
  SEWANEE.
  SHERWOOD. 

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING 
GOLFBALL SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS TO NEAR 80 
MPH...EVEN OUTSIDE OF THE TORNADO AREA.

LAT...LON 3501 8631 3498 8593 3500 8587 3522 8590

$$

CBD

1 follow-up statement

000 
WWUS54 KHUN 080217
SVSHUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
917 PM CDT FRI APR 7 2006

TNC051-080227-
/O.EXP.KHUN.TO.W.0021.000000T0000Z-060408T0215Z/
FRANKLIN TN-
917 PM CDT FRI APR 7 2006

...THE TORNADO WARNING FOR SOUTHEAST FRANKLIN COUNTY HAS BEEN 
ALLOWED TO EXPIRE...

AT 917 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT
THE THUNDERSTORM THAT PROMPTED THE TORNADO WARNING HAD EXITED
FRANKLIN COUNTY. THEREFORE...THE TORNADO WARNING HAS BEEN ALLOWED TO
EXPIRE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 4 AM CST.

LAT...LON 3501 8631 3498 8593 3500 8587 3522 8590

$$

CBD

The office that day

Everything else NWS Huntsville, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 7, 7:21 PM CDT	Tornado Warning	HUN	Lincoln	39 min
Apr 7, 7:30 PM CDT	Flash Flood Warning	HUN	Lincoln, Moore	4 hr
Apr 7, 7:55 PM CDT	Tornado Warning	HUN	Lincoln	20 min
Apr 7, 8:04 PM CDT	Tornado Warning	HUN	Franklin	41 min
Apr 7, 10:00 PM CDT	Flash Flood Warning	HUN	Franklin	3 hr

Nearby

Tornado Warnings in Tennessee, 2006 Every tornado warning in 2006 Tornadoes in 2006

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.