Alert archive / Tennessee / Tornado Warnings in 2000

Tornado Warning 3, NWS Morristown, TN

April 20, 2000Claiborne County, Tennessee

NWS Morristown, TN issued this tornado warning at Apr 20, 2000, 10:12 PM EDT for Claiborne County, Tennessee. It was in force for 48 min. 2 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, 10:12 PM EDT (02:12 UTC)
Expired: Apr 20, 2000, 11:00 PM EDT
In force: 48 min
Issued by: NWS Morristown, TN
Area: Whole counties

County Claiborne County, TN

The radar

The Knoxville radar (KMRX), 42 km from the middle of the area, began a volume at 02:14 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, 10:30 PM EDT	Thunderstorm Wind	Lone Mtn, TN
Apr 20, 10:35 PM EDT	Tornado F0	Manring, TN

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, 9:35 PM EDT	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 2.2 hours before the alert went out and 266 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.

366 
WFUS54 KMRX 210215
TORMRX
TNC025-210300-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
1012 PM EDT THU APR 20 2000

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A

* TORNADO WARNING FOR...
  CLAIBORNE COUNTY IN EASTERN TENNESSEE

* UNTIL 1100 PM EDT

* AT 1012 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED A 
TORNADIC STORM MOVING EAST AT 45 MPH. UNCONFIRMED REPORTS INDICATE 
THAT A TORNADO WAS SIGHTED IN HUNTSVILLE JUST BEFORE 10 PM EDT. THE 
STORM STILL SHOWS STRONG ROTATION ON RADAR AS IT IS APPROACHING 
CLAIBORNE COUNTY.

* THE TORNADO IS EXPECTED TO BE NEAR...
  CLAIRFIELD AROUND 1020 PM EDT
  ARTHUR AROUND 1040 PM EDT

NIGHTTIME TORNADOES ARE ESPECIALLY DANGEROUS. TAKE COVER NOW IF YOU
WAIT UNTIL YOU SEE OR HEAR IT COMING...IT MAY BE TOO LATE TO GET TO A
SAFE PLACE.

$$

NNNN

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 9:08 PM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Sequatchie	62 min
Apr 20, 9:12 PM EDT	Severe Thunderstorm Warning	MRX	Morgan, Scott	28 min
Apr 20, 9:36 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Scott	44 min
Apr 20, 9:44 PM EDT	Tornado Warning	MRX	Sequatchie	46 min
Apr 20, 9:45 PM EDT	Tornado Warning	MRX	Campbell, Scott	30 min
Apr 20, 9:48 PM EDT	Severe Thunderstorm Warning	MRX	Marion	62 min
Apr 20, 10:01 PM EDT	Severe Thunderstorm Warning	MRX	Hamilton, Meigs, Rhea	59 min
Apr 20, 10:51 PM EDT	Severe Thunderstorm Warning	MRX	Bradley	59 min
Apr 20, 11:44 PM EDT	Severe Thunderstorm Warning	MRX	Monroe	61 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.