Alert archive / Tennessee / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 155, NWS Morristown, TN

July 29, 2000Loudon County, Roane County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 29, 2000, 7:49 PM EDT for Loudon County, Roane County, Tennessee. It was in force for 26 min. 1 report 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: Jul 29, 2000, 7:49 PM EDT (23:49 UTC)
Expired: Jul 29, 2000, 8:15 PM EDT
In force: 26 min
Issued by: NWS Morristown, TN
Area: Whole counties

Counties Loudon County, TN, Roane County, TN

What was reported inside it

Time	Report	Where	Remark
Jul 29, 7:55 PM EDT	Thunderstorm Wind	Countywide, 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 nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 11.8 hours before the alert went out and 200 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: 288 J/kg
Mixed-layer CIN: -120 J/kg
Mixed-layer LCL: 1076 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KMRX 292351
SVRMRX
TNC105-145-300015-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
749 PM EDT SAT JUL 29 2000

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LOUDON COUNTY IN EASTERN TENNESSEE
  ROANE COUNTY IN EASTERN TENNESSEE

* UNTIL 815 PM EDT

* AT 744 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 6 MILES SOUTHWEST OF BRADBURY...OR 6 MILES
  NORTHWEST OF LOUDON...MOVING NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL MOVE ACROSS CENTRAL AND NORTHERN 
  PORTIONS OF ROAN AND LOUDON COUNTIES THROUGH 815 PM.

THE SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING...
  WINDS UP TO 60 MPH...WHICH COULD PUSH OVER SHALLOW ROOTED TREES AND
  BREAK LIMBS OFF OF TREES ABOUT THE SIZE OF YOUR WRIST.
  HAIL UP TO 1 INCH IN DIAMETER...OR THE SIZE OF QUARTERS.
  FREQUENT AND DEADLY CLOUD-TO-GROUND LIGHTNING.

SEEK A STURDY SHELTER IMMEDIATELY!

$$

LAT...LON 3581 8457 3569 8441 3586 8425 3600 8436

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 Jul 29, 2:55 PM EDT, 4 hours 54 minutes earlier.

Area forecast discussion, Jul 29, 2:55 PM EDT, 4 hours 54 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
255 PM EDT SAT JUL 29 2000

OVERALL MODELS WERE SOMEWHAT SIMILAR IN FORECASTING SOME CONVECTION
FOR MUCH OF THE SHORT RANGE PERIODS.  LEAD SHORTWAVE/JET MAX WILL
PROVIDE GOOD UPPER LEVEL SUPPORT TONIGHT...SO WENT ABOVE MOS POPS
AND DID NOT MENTION A TIME QUALIFIER.  SATELLITE/RADAR DATA SHOWS
SCATTERED CONVECTION FIRING QUICKLY ACROSS MIDDLE TN AND CUMBERLAND
PLATEAU...WITH AIRMASS APROACHING 1500 TO 2500 CAPES.  FREEZING LEVEL
IS A BIT HIGHER...BUT SLIGHTLY BETTER SHEAR PLUS UPPER LEVEL SUPPORT
MAY PRODUCE A FEW SEVERE STORMS.  WILL LIKELY ADD...SOME STORMS MAY
BE SEVERE FOR THIS EVENING.

CONVECTION ON SUNDAY COULD BE ANYTIME...SO NO QUALIFIER.  ALSO NOTED
THAT LOW LEVEL FLOW BECOMES MORE SOUTHERLY AHEAD OF PERSISTENT UPPER
LEVEL TROF.  THIS HINTS AT BETTER LOW LVL CONVERGENCE ACROSS SRN
ZONES...SO ACTUALLY WENT LITTLE HIGHER ACROSS SRN ZONES (50% POPS)...
AS WELL AS NE PLATEAU GROUP.  COORDINATED WITH BNA AND FOUND GOOD
AGREEMENT ON TONIGHT AND SUNDAY.

SUN NIGHT INTO EARLY MONDAY...MESO ETA MODEL SEEMS TO TIME ANOTHER
SHORTWAVE AND JET MAX TO MOVE EAST OUT OF THE UPPER LEVEL TROF.
THUS...AGAIN WENT ABOVE MOS POPS ON THE ORDER OF 60-70%.  ALL SHORT
RANGES MODELS INDICATED PERHAPS DECREASING PCPN FOR MON...SO FOR
NOW MAINTAINED CONSISTENCY WITH PREVIOUS ZONES AT 40% CHANCES ALL
ZONES.  PLANVIEW MODEL CAPES LOOKED TOO LOW FOR SUN NIGHT/MONDAY
GIVEN MOIST S-SW FLOW.  MOIST AND UNSTABLE WITH UPPER TROF TO OUR
W THROUGH THE EXTENDED...SO MORE RAIN CHANCES AHEAD.

CHA TE 070/088 070/086 070 10556
TYS EE 069/086 069/085 069 10646
TRI EE 065/085 066/083 066 10646
OQT qEE 069/086 068/084 068 10646

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

TG

In the hours before

Local storm report, Jul 29, 6:06 PM EDT, 1 hour 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
606 PM EDT SAT JUL 29 2000

TIME(EDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ...COUNTY LOCATION....

600 PM     EAST OF CHATTANOOGA       TN   WIND DAMAGE
07/29/00   HAMILTON                       REPORTED BY DISPATCH
                                          NUMEROUS TREES AND POWER
                                          LINES DBOWN.

600 PM     CHATTANOOGA                    0.75 INCH HAIL
07/29/00   HAMILTON                       REPORTED BY DISPATCH
                                          IN CHESTERFROST PARK.

Local storm report, Jul 29, 6:34 PM EDT, 1 hour 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
634 PM EDT SAT JUL 29 2000

TIME(EDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ...COUNTY LOCATION....

607 PM     HARRISON                  TN   60 MPH TSTM GUST
07/29/00   HAMILTON                       REPORTED BY SPOTTER

Local storm report, Jul 29, 7:25 PM EDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
725 PM EDT SAT JUL 29 2000

TIME(EDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ...COUNTY LOCATION....

600 PM     HIXSON                    TN   WIND DAMAGE
07/29/00   HAMILTON                       REPORTED BY SPOTTER
                                          TREES DOWN AND CAMPERS
                                          DAMAGED IN CHESTERFROST
                                          PARK.

655 PM     ATHENS                    TN   WIND DAMAGE
07/29/00   MCMINN                         REPORTED BY DISPATCH
                                          LIMBS BLOWN OFF TREES

700 PM     SOUTHWEST PART COUNTY     TN   WIND DAMAGE
07/29/00   MEIGS                          REPORTED BY DISPATCH
                                          TREES DOWN

700 PM     YSWEETWATER                TN   WIND DAMAGE
07/29/00   MONROE                         REPORTED BY PUBLIC
                                          TREES DOWN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 8:51 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Knox	24 min
Jul 28, 9:14 PM EDT	Severe Thunderstorm Warning	MRX	Knox	31 min
Jul 29, 5:46 PM EDT	Severe Thunderstorm Warning	MRX	Hamilton	44 min
Jul 29, 6:27 PM EDT	Severe Thunderstorm Warning	MRX	McMinn, Meigs	48 min
Jul 29, 7:14 PM EDT	Severe Thunderstorm Warning	MRX	Monroe	46 min
Jul 29, 7:30 PM EDT	Severe Thunderstorm Warning	MRX	Jefferson, Sevier	45 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.