Alert archive / Tennessee / Tornado Warnings in 2000

Tornado Warning 41, NWS Nashville, TN

April 20, 2000Coffee County, Tennessee

NWS Nashville, TN issued this tornado warning at Apr 20, 2000, 7:09 PM CDT for Coffee County, Tennessee. It was in force for 51 min. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Apr 20, 2000, 7:09 PM CDT (00:09 UTC)
Expired: Apr 20, 2000, 8:00 PM CDT
In force: 51 min
Issued by: NWS Nashville, TN
Area: Whole counties

County Coffee County, TN

The radar

The Northeast Alabama radar (KHTX), 62 km from the middle of the area, began a volume at 00:08 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
Apr 20, 7:38 PM CDT	Thunderstorm Wind 60 E	Manchester, TN	Ham reported barn roof blown off and trees down.
Apr 20, 7:38 PM CDT	Thunderstorm Wind 60 E	Manchester, TN	Ham reported some damage at Arnold Engineering Center.
Apr 20, 7:41 PM CDT	Thunderstorm Wind 60 E	East Portion, TN	Ham reported trees down.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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 20, 5:15 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 0.2 hours before the alert went out and 85 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: 1081 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 1023 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 274 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 2.8

Open this sounding in Storm Lab

The text

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

406 
WFUS54 KOHX 210010
TORBNA
TNC031-210100-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
709 PM CDT THU APR 20 2000

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* TORNADO WARNING FOR...
  COFFEE COUNTY IN TENNESSEE

* UNTIL 800 PM CDT

* AT 703 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  THUNDERSTORM WITH A DEVELOPING TORNADO 17 MILES WEST OF
  MANCHESTER...OR ABOUT 5 MILES NORTHEAST OF SHELBYVILLE...MOVING    
  EAST AT 40 MPH. GOLFBALL SIZE HAIL HAS BEEN REPORTED WITH THIS STORM.

* TOWNS IN THE PATH OF THIS STORM INCLUDE MANCHESTER.

IN ADDITION TO THE THREAT OF A TORNADO...DAMAGING HAIL AND STRONG
WINDS CAN BE EXPECTED. GO TO A SAFE PLACE NOW
$$

08

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 7:15 PM CDT	Severe Thunderstorm Warning	OHX	Marshall	15 min
Apr 20, 7:31 PM CDT	Severe Thunderstorm Warning	OHX	Bedford	44 min
Apr 20, 7:36 PM CDT	Severe Thunderstorm Warning	OHX	Overton	39 min
Apr 20, 7:41 PM CDT	Tornado Warning	OHX	Warren	34 min
Apr 20, 7:53 PM CDT	Tornado Warning	OHX	Fentress	37 min
Apr 20, 7:58 PM CDT	Severe Thunderstorm Warning	OHX	Coffee	32 min
Apr 20, 8:11 PM CDT	Tornado Warning	OHX	Coffee, Grundy	34 min
Apr 20, 8:16 PM CDT	Tornado Warning	OHX	Van Buren	14 min
Apr 20, 8:23 PM CDT	Severe Thunderstorm Warning	OHX	Fentress	37 min
Apr 20, 8:32 PM CDT	Severe Thunderstorm Warning	OHX	Franklin	28 min
Apr 20, 8:50 PM CDT	Severe Thunderstorm Warning	OHX	Grundy	25 min

Nearby

Tornado Warnings in Tennessee, 2000 Every tornado warning in 2000 Tornadoes in 2000

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.