Alert archive / North Carolina / Tornado Watches in 1998

Tornado Watch 239

April 16, 19984 states

The Storm Prediction Center issued this tornado watch at Apr 16, 1998, 11:00 PM EDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 16, 1998, 11:00 PM EDT (03:00 UTC)
Expired
Apr 17, 1998, 5:00 AM EDT
In force
6 hr
Issued by
the Storm Prediction Center
All 78 counties

Alexander County, NC, Alleghany County, NC, Ashe County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Catawba County, NC, Cherokee County, NC, Clay County, NC, Cleveland County, NC, Davidson County, NC, Davie County, NC, Forsyth County, NC, Gaston County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Iredell County, NC, Jackson County, NC, Lincoln County, NC, Macon County, NC, Madison County, NC, McDowell County, NC, Mecklenburg County, NC, Mitchell County, NC, Polk County, NC, Rockingham County, NC, Rowan County, NC, Rutherford County, NC, Stanly County, NC, Stokes County, NC, Surry County, NC, Swain County, NC, Transylvania County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Yancey County, NC, Cherokee County, SC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Carter County, TN, Claiborne County, TN, Cocke County, TN, Cumberland County, TN, Fentress County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hamilton County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Johnson County, TN, Knox County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Union County, TN, Washington County, TN, City of Bristol, VA, Henry County, VA

Warnings issued inside it

12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Apr 16, 11:20 PM EDTFlash Flood WarningMRXAnderson, Roane5 hr
Apr 16, 11:24 PM EDTSevere Thunderstorm WarningMRXMeigs, Rhea61 min
Apr 16, 11:24 PM EDTSevere Thunderstorm WarningMRXBradley61 min
Apr 16, 11:36 PM EDTTornado WarningMRXBradley34 min
Apr 16, 11:41 PM EDTTornado WarningMRXMcMinn49 min
Apr 16, 11:54 PM EDTSevere Thunderstorm WarningMRXLoudon, Monroe, Roane61 min
Apr 16, 11:54 PM EDTTornado WarningMRXBlount, Loudon46 min
Apr 17, 12:10 AM EDTFlash Flood WarningMRXLoudon3 hr
Apr 17, 12:17 AM EDTSevere Thunderstorm WarningMRXPolk63 min
Apr 17, 12:35 AM EDTFlash Flood WarningMRXKnox3 hr
Apr 17, 2:33 AM EDTFlash Flood WarningGSPCaldwell4 hr
Apr 17, 4:02 AM EDTSevere Thunderstorm WarningRNKStokes48 min

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 3.0 hours before the alert went out and 280 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, Peachtre/Fal Fld, GA at 00:00Z on 1998-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1217 joules per kilogram.LCLLFCEL10008507005003002001001 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, Peachtre/Fal Fld, GA at 00:00Z on 1998-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 280 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
1217 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
573 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
280 m²/s²
0-3 km storm-relative helicity
368 m²/s²
Significant tornado parameter
3.0
Supercell composite
10.6

Open this sounding in Storm Lab

The text

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

328 
WWUS9 KMKC 170228
SEL9  
MKC WW 170228
TNZ000-NCZ000-170900-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 239
STORM PREDICTION CENTER NORMAN OK
1028 PM EDT THU APR 16 1998

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   EASTERN TENNESSEE                          
   WESTERN NORTH CAROLINA                     
   
EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1100 PM UNTIL
500 AM EDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 150 STATUTE MILES EAST AND WEST
OF A LINE FROM 40 MILES SOUTHWEST OF ASHEVILLE NORTH CAROLINA TO 15
MILES NORTHEAST OF BRISTOL TENNESSEE.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO WATCH
NUMBER 232.  WATCH NUMBER 232 WILL NOT BE IN EFFECT AFTER 1100 PM
EDT.  CONTINUE...WW 234...WW 235...WW 237...WW 238...

DISCUSSION...STRONG/SEVERE THUNDERSTORMS OVER EAST TENNESSEE ARE
EXPECTED TO SPREAD EASTWARD TONIGHT AHEAD OF ADVANCING COLD FRONT. 
OTHER STORMS MAY DEVELOP NEAR EAST/WEST BOUNDARY EXTENDING INTO
WESTERN NORTH CAROLINA.  VAD WIND PROFILES CONTINUE TO SHOW STRONG
WINDS THAT VEER WITH HEIGHT...RESULTING IN FAVORABLE SHEAR FOR
POSSIBLE SUPERCELL ACTIVITY.  00Z RUC2 MODEL ALSO FORECASTS 60 KT
850 MB JET ACROSS THIS REGION TONIGHT WHICH WILL MAINTAIN STRONG
SHEAR AND HELICITY.


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 420. 
MEAN STORM MOTION VECTOR 23050.


...WEISS

350,0854 363,0845 363,0792 350,0802

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 17, 1:30 AM EDTTornado WatchSPCUnion6 hr
Apr 17, 8:00 AM EDTTornado WatchSPCRobeson6 hr
Apr 17, 7:30 PM EDTTornado WatchSPCAlamance, Bertie, Caswell, Chatham, Durham, Edgecombe and 23 more5 hr
Apr 16, 8:00 PM EDTTornado WatchSPCBuchanan, Dickenson, Lee, Russell, Scott, Wise and 1 more5 hr
Apr 17, 3:00 PM EDTSevere Thunderstorm WatchSPCArlington, Caroline, Culpeper, Essex, Fairfax, Fauquier and 15 more6 hr

Nearby

Tornado Watches in North Carolina, 1998Tornado Watches in Tennessee, 1998Tornado Watches in Virginia, 1998Every tornado watch 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.