Alert archive / Tennessee / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 321, NWS Morristown, TN

June 10, 1998Johnson County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jun 10, 1998, 3:44 AM EDT for Johnson County, Tennessee. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 10, 1998, 3:44 AM EDT (07:44 UTC)
Expired
Jun 10, 1998, 4:20 AM EDT
In force
36 min
Issued by
NWS Morristown, TN
Area
Whole counties

County Johnson County, TN

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 7.7 hours before the alert went out and 180 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-pSkew-T log-p diagram, Greensboro/Hi Pt, NC at 00:00Z on 1998-06-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 00:00Z on 1998-06-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 153 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
1 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
660 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
153 m²/s²
0-3 km storm-relative helicity
501 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.

109 
WUUS01 KMRX 100745 RRA
SVRMRX
TNC091-100820-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE KNOXVILLE/TRI-CITIES TN
344 AM EDT WED JUN 10 1998

THE NATIONAL WEATHER SERVICE IN KNOXVILLE/TRI-CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN JOHNSON COUNTY IN EASTERN TENNESSEE

* UNTIL 420 AM EDT

* AT 344 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 8 MILES NORTH OF MOUNTAIN CITY... MOVING
  SOUTHEAST AT 25 MILES AN HOUR.

DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS

FF/TG

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 Jun 10, 2:35 AM EDT, 1 hour 9 minutes earlier.

Area forecast discussion, Jun 10, 2:35 AM EDT, 1 hour 9 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KNOXVILLE/TRI-CITIES TN
235 AM EDT WED JUN 10 1998

WILL ATTEMPT TO FIRE OUT A SOMEWHAT ABBREVIATED AFD THIS MRNG.  BRIEF
LOOK AT CURRENT SFC/RADAR/STLT PICS AND 10/00Z DATA SHOWS VERY
UNSTABLE AIRMASS THIS MRNG...ESPECIALLY MIDDLE TN AND PLATEAU.  SFC
WARM FRONT SEEMS TO SLICE N-S THRU CNTRL KY AND PLATEAU...WITH 850 MB
ANLYS SHOWING GOOD WAA...THETA-E RIDGE AND THETA-E ADVECTION INTO THE
CWA ATTM AND THRU GOOD PART OF TODAY.  92F PROG MAY BE OPTIMISTIC IN
LIFTING THE WARM FRONT TO NEAR TRI BY 12Z TODAY.  ANYWAY...CONSIDERING
ALL OF THIS...MIGHT BE WISE TO UP POPS FOR TODAY TO NEAR FAN MOS (50-
60%).  A GOOD UPDATE ALREADY THIS MRNG FROM CRW TO ADD POPS!

GOOD THREAT OF SEVERE BASED ON STRONG WIND FIELDS AND JUST GOT A
REPORT FROM CRW OF HALF-DOLLAR SIZED HAIL WITH CELL MOVG SE INTO
RUSSELL COUNTY.  THANKS TO CRW FOR CALL AND WE WERE IN PROCESS OF
ISSUING A SVR TSTM WARNING...FOR SURROUNDING OFFICES THE VIL WAS
ONLY AROUND 50.  SPC HAS ALREADY MENTIONED A PSBL WATCH SHORTLY
WHICH WOULD LIKELY INCLUDE SWRN VA AND NE TN CWA.

OTRW...LATER PERIODS...I HAVE NO PROBLEM WITH ONGOING LOW POPS
(20-30%) FOR TNGT AND GENLY CHC (30%) ACROSS THE BOARD ON THU.
TEMPS BRIEFLY...I WOULD PROBABLY STAY BELOW THE WARMEST MAXES WITH
MINS FOR TNGT CLOSE AND ACCEPTABLE.  GOTTA GO MONITOR STORMS ON KMRX
AND KHTX PUPS!   #10

TG

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 10, 2:43 AM EDTSevere Thunderstorm WarningMRXCampbell47 min
Jun 10, 11:25 AM EDTSevere Thunderstorm WarningMRXCumberland60 min
Jun 10, 11:54 AM EDTSevere Thunderstorm WarningMRXRhea46 min
Jun 10, 12:02 PM EDTFlash Flood WarningMRXCumberland3 hr
Jun 10, 12:27 PM EDTSevere Thunderstorm WarningMRXCumberland63 min
Jun 10, 12:33 PM EDTSevere Thunderstorm WarningMRXHamilton62 min
Jun 10, 12:52 PM EDTSevere Thunderstorm WarningMRXRoane48 min
Jun 10, 1:07 PM EDTSevere Thunderstorm WarningMRXBradley, Polk33 min
Jun 10, 1:11 PM EDTSevere Thunderstorm WarningMRXMeigs34 min
Jun 10, 1:18 PM EDTSevere Thunderstorm WarningMRXMonroe62 min
Jun 10, 1:24 PM EDTSevere Thunderstorm WarningMRXLoudon, McMinn66 min
Jun 10, 1:24 PM EDTSevere Thunderstorm WarningMRXRhea66 min
Jun 10, 1:33 PM EDTFlash Flood WarningMRXMorgan, Roane3 hr
Jun 10, 1:33 PM EDTFlash Flood WarningMRXMeigs, Rhea3 hr
Jun 10, 1:36 PM EDTSevere Thunderstorm WarningMRXBlount19 min
Jun 10, 1:38 PM EDTSevere Thunderstorm WarningMRXHamilton62 min
Jun 10, 1:40 PM EDTSevere Thunderstorm WarningMRXBradley65 min
Jun 10, 2:31 PM EDTTornado WarningMRXBradley64 min
Jun 10, 2:34 PM EDTSevere Thunderstorm WarningMRXHamilton61 min
Jun 10, 2:34 PM EDTSevere Thunderstorm WarningMRXPolk61 min
Jun 10, 2:46 PM EDTFlash Flood WarningMRXCumberland3 hr

Nearby

Severe Thunderstorm Warnings in Tennessee, 1998Every severe thunderstorm warning in 1998

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.