Alert archive / Tennessee / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 18, NWS Morristown, TN

April 20, 2000Hamilton County, Meigs County, Rhea County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Apr 20, 2000, 10:01 PM EDT for Hamilton County, Meigs County, Rhea County, Tennessee. It was in force for 59 min. 6 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, 10:01 PM EDT (02:01 UTC)
Expired: Apr 20, 2000, 11:00 PM EDT
In force: 59 min
Issued by: NWS Morristown, TN
Area: Whole counties

Counties Hamilton County, TN, Meigs County, TN, Rhea County, TN

What was reported inside it

Time	Report	Where
Apr 20, 10:15 PM EDT	Thunderstorm Wind	Spring City, TN
Apr 20, 10:25 PM EDT	Hail 1	Mowbray, TN
Apr 20, 10:25 PM EDT	Thunderstorm Wind	Dayton, TN
Apr 20, 10:30 PM EDT	Hail 0.75	Soddy Daisy, TN
Apr 20, 10:50 PM EDT	Hail 0.75	Decatur, TN
Apr 20, 10:55 PM EDT	Thunderstorm Wind	Decatur, 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, 2.0 hours before the alert went out and 166 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.

202 
WUUS54 KMRX 210203
SVRMRX
TNC065-121-143-210300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
1001 PM EDT THU APR 20 2000

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  HAMILTON COUNTY IN EASTERN TENNESSEE
  MEIGS COUNTY IN EASTERN TENNESSEE
  RHEA COUNTY IN EASTERN TENNESSEE

* UNTIL 1100 PM EDT(1000 PM CDT)

* AT 1001 PM EDT(901 PM CDT)...NATIONAL WEATHER SERVICE DOPPLER RADAR
  INDICATED SEVERE THUNDERSTORMS ALONG A LINE EXTENDING FROM JUST    
  NORTH OF DAYTON TO 10 MILES WEST OF SALE CREEK...MOVING EAST 
  AT 40 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  SALE CREEK AROUND 1010 PM EDT
  GRAYSVILLE AROUND 1015 PM EDT
  BIRCHWOOD AROUND 1020 PM EDT
  BIG SPRING AROUND 1030 PM EDT

THE SEVERE THUNDERSTORMS ARE CAPABLE OF PRODUCING...
  WINDS UP TO 70 MPH...WHICH COULD PUSH OVER SHALLOW ROOTED TREES...
  AND DAMAGE CHIMNEYS AND TV ANTENNAS.
  HAIL UP TO 1 INCH IN DIAMETER...OR THE SIZE OF QUARTERS.

$$

NNNN

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 Morristown, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 20, 7:24 PM EDT, 2 hours 37 minutes earlier.

Area forecast discussion, Apr 20, 7:24 PM EDT, 2 hours 37 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
724 PM EDT THU APR 20 2000

SPS ISSUED A WATCH BOX FOR OUR PLATEAU COUNTIES...SENT A QUICK UPDATE
TO INCLUDE IT.  REST OF ZONES LOOK MOK...SO WILL HOLD OFF UNTIL WATCH
EXPIRES AT 10 PM FOR THE NEXT UPDATE.

.MRX...
NC...NONE.
TN...NONE.
VA...NONE.

GH

In the hours before

Special weather statement, Apr 20, 7:21 PM EDT, 2 hours 40 minutes before

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-005-
006-008-210300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
721 PM EDT THU APR 20 2000

...TORNADO WATCH IN EFFECT FOR THE CUMBERLAND PLATEAU IN EAST
TENNESSEE UNTIL 10 PM EDT (9 PM CDT)...

A TORNADO WATCH IS IN EFFECT FOR AREAS ALONG AND WEST OF A LINE
EXTENDING FROM LA FOLLETTE...TO ROSEDALE...TO PETROS...TO HARRIMAN...
TO SPRING CITY...TO DAYTON...AND TO CHATTANOOGA.

AT 7 PM EDT (6 PM CDT)...A LINE OF STRONG TO SEVERE THUNDERSTORMS WAS
MOVING ACROSS MIDDLE TENNESSEE.  THIS LINE IS EXPECTED TO MOVE INTO
THE CUMBERLAND PLATEAU THIS EVENING.  SEVERE WEATHER IS POSSIBLE
AS THIS LINE MOVES ACROSS THE PLATEAU...INCLUDING TORNADOES.  STRONG
THUNDERSTORMS ARE LIKELY ACROSS THE REST OF EAST TENNESSEE...
SOUTHWEST VIRGINIA...AND EXTREME SOUTHWEST NORTH CAROLINA LATER THIS
EVENING.  THE MAIN THREAT ACROSS AREAS EAST OF CUMBERLAND PLATEAU
WILL BE STRONG DAMAGING WINDS...LARGE HAIL...AND VERY HEAVY RAIN.
ISOLATED TORNADOES ARE POSSIBLE.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL TELEVISION OR RADIO
STATIONS...OR YOUR CABLE TELEVISION PROVIDER FOR LATER STATEMENTS#
CONCERNING THIS POTENTIAL SEVERE WEATHER SITUATION.

GH

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, 10:12 PM EDT	Tornado Warning	MRX	Claiborne	48 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

Severe Thunderstorm Warnings in Tennessee, 2000 Every severe thunderstorm warning 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.