Alert archive / Tennessee / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 206, NWS Morristown, TN

May 20, 1998Johnson County, Sullivan County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at May 20, 1998, 10:14 PM EDT for Johnson County, Sullivan County, Tennessee. It was in force for 46 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: May 20, 1998, 10:14 PM EDT (02:14 UTC)
Expired: May 20, 1998, 11:00 PM EDT
In force: 46 min
Issued by: NWS Morristown, TN
Area: Whole counties

Counties Johnson County, TN, Sullivan County, TN

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 20, 7:30 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 2.2 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: 1319 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 1463 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: -33 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 May 20, 8:20 PM EDT, 1 hour 54 minutes earlier.

Area forecast discussion, May 20, 8:20 PM EDT, 1 hour 54 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KNOXVILLE/TRI-CITIES TN
820 PM EDT WED MAY 20 1998

THE LEADING EDGE OF THE MCS IS NOW ENTERING WISE COUNTY VA.  ADAP
CONTINUES TO SHOW SURFACE BASED LIFTED INDICES AROUND -10 ACROSS ALL
OF SW VA AND NE TN.  KMRX VWP SHOWS SWLY LOW LVL WINDS OF AROUND 15
KNOTS AND SO THERE IS CONTINUED INFLOW INTO THIS MCS...ALBEIT WK.
FURTHER EAST...THERE HAVE BEEN ISOLATED PULSE SVR STORMS ACROSS MAINLY
WASHINGTON COUNTY VA.  BLV THESE HAVE BEEN FIRING ALONG AN OLD OUTFLOW
BNDRY.  THIS OLD BNDRY AND ITS INTERACTION WITH THE EWD-MOVING MCS WL
CONTINUE THE CHCS FOR STRONG TO SVR CONVECTION ACROSS MAINLY SW VA AND
EXTREME NE TN FOR THE NEXT FEW HOURS.  ACROSS THE REMAINDER OF EAST TN
AND SW NC THE CHCS FOR CONVECTION WL BE SLIM TNT GIVEN THE CAP.  THE
TEMPS LOOK FINE.

MB

In the hours before

Local storm report, May 20, 8:40 PM EDT, 1 hour 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KNOXVILLE/TRI-CITIES TN
840 PM EDT WED MAY 20 1998

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

705 PM     3 E ABINGDON              VA   1.00 INCH HAIL
05/20/98   WASHINGTON                     QUARTER SIZE HAIL ON WATAUGA
                                          ROAD OFF ROUTE 58. REPORTED
                                          BY SHERIFFS DISPATCH.

FERRELL

Local storm report, May 20, 8:40 PM EDT, 1 hour 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KNOXVILLE/TRI-CITIES TN
840 PM EDT WED MAY 20 1998

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

705 PM     3 E ABINGDON              VA   1.00 INCH HAIL
05/20/98   WASHINGTON                     QUARTER SIZE HAIL ON WATAUGA
                                          ROAD OFF ROUTE 58. REPORTED
                                          BY SHERIFFS DISPATCH.

FERRELL

Local storm report, May 20, 9:13 PM EDT, 1 hour 1 minute before

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Local storm report, May 20, 9:50 PM EDT, 24 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 9:32 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Johnson	33 min
May 21, 4:55 PM EDT	Severe Thunderstorm Warning	MRX	Roane	35 min
May 21, 5:45 PM EDT	Severe Thunderstorm Warning	MRX	Loudon	35 min
May 21, 5:55 PM EDT	Severe Thunderstorm Warning	MRX	Knox	50 min
May 21, 6:32 PM EDT	Severe Thunderstorm Warning	MRX	Roane	33 min
May 21, 6:45 PM EDT	Severe Thunderstorm Warning	MRX	Knox	30 min
May 21, 6:48 PM EDT	Severe Thunderstorm Warning	MRX	Jefferson, Sevier	47 min
May 21, 6:52 PM EDT	Flash Flood Warning	MRX	Knox	2 hr
May 21, 7:14 PM EDT	Severe Thunderstorm Warning	MRX	Knox	31 min
May 21, 7:29 PM EDT	Severe Thunderstorm Warning	MRX	Roane	31 min
May 21, 7:39 PM EDT	Severe Thunderstorm Warning	MRX	Cocke	36 min
May 20, 8:02 PM EDT	Severe Thunderstorm Warning	MRX	Wise	48 min
May 20, 8:04 PM EDT	Severe Thunderstorm Warning	MRX	Washington	51 min
May 20, 8:54 PM EDT	Severe Thunderstorm Warning	MRX	Washington	46 min
May 20, 9:03 PM EDT	Flash Flood Warning	MRX	Washington	3 hr

Nearby

Severe Thunderstorm Warnings in Tennessee, 1998 Every 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.