Alert archive / Tennessee / Flash Flood Warnings in 1998

Flash Flood Warning 45, NWS Morristown, TN

April 18, 1998Blount County, Sevier County, Tennessee

NWS Morristown, TN issued this flash flood warning at Apr 18, 1998, 11:04 PM EDT for Blount County, Sevier County, Tennessee. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 18, 1998, 11:04 PM EDT (03:04 UTC)
Expired
Apr 19, 1998, 4:05 AM EDT
In force
5 hr
Issued by
NWS Morristown, TN
Area
Whole counties

Counties Blount County, TN, Sevier County, TN

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 3.1 hours before the alert went out and 263 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, Nashville Metro, TN at 00:00Z on 1998-04-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Nashville Metro, TN at 00:00Z on 1998-04-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
498 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
28 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 
TTAA00 KMRX 190305
FFWMRX
TNC009-029-035-057-063-067-073-089-129-143-155-VAC105-190805-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE KNOXVILLE/TRI-CITIES TN
1104 PM EDT (1004 PM CDT) SAT APR 18 1998

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

* FLASH FLOOD WARNING FOR...
  BLOUNT COUNTY IN EASTERN TENNESSEE
  COCKE COUNTY IN EASTERN TENNESSEE
  CUMBERLAND COUNTY IN EASTERN TENNESSEE
  GRAINGER COUNTY IN EASTERN TENNESSEE
  HAMBLEN COUNTY IN EASTERN TENNESSEE
  HANCOCK COUNTY IN EASTERN TENNESSEE
  HAWKINS COUNTY IN EASTERN TENNESSEE
  JEFFERSON COUNTY IN EASTERN TENNESSEE
  MORGAN COUNTY IN EASTERN TENNESSEE
  RHEA COUNTY IN EASTERN TENNESSEE
  SEVIER COUNTY IN EASTERN TENNESSEE
  LEE COUNTY IN SOUTHWESTERN VIRGINIA

* UNTIL 405 AM EDT (305 AM CDT)

* AT 11 PM EDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THAT A LARGE AREA OF HEAVY RAINFALL WAS LOCATED ACROSS THE ENTIRE
  WARNED AREA... MOVING NORTHEAST AT 35 MPH.

* EXCESSIVE RAINFALL AT THE RATE OF ONE TO TWO INCHES PER HOUR WILL
  PRODUCE FLOODING AT ANY LOCATION...AT ANY TIME...WITHIN THE
  WARNED AREA THROUGH 410 AM EDT (310 AM CDT).

  DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD!

CAC

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Apr 18, 9:20 PM EDT, 1 hour 44 minutes earlier.

Area forecast discussion, Apr 18, 9:20 PM EDT, 1 hour 44 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KNOXVILLE/TRI-CITIES TN
920 PM EDT SAT APR 18 1998

ON GOING SEVERE WEATHER HAVE NOT LOOKED AT ANY NEW DATA...BUT ONGOING
FORECAST LOOKS GOOD.

PDK

In the hours before

Local storm report, Apr 18, 10:50 PM EDT, 14 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KNOXVILLE/TRI-CITIES TN
1050 PM EDT SAT APR 18 1998

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

930 PM     KNOXVILLE                 TN   1.00 INCH HAIL
04/18/98   KNOX                           NEAR WATT RD.

930 PM     SOUTH PART OF COUNTY      TN   0.75 INCH HAIL
04/18/98   UNION

830 PM     HIXSON                    TN   0.75 INCH HAIL
04/18/98   HAMILTON                       REPORTED BY SKYWARN SPOTTER

855 PM     LOOKOUT MTN.              TN   0.88 INCH HAIL
04/18/98   HAMILTON                       NICKEL SIZE HAIL REPORTED BY
                                          SPOTTER

1003 PM    NEAR CEDAR SPRINGS        TN   0.88 INCH HAIL
04/18/98   BRADLEY                        REPORTED BY HAM OPERATOR

700 PM     CRAB ORCHARD              TN   FLOODING
04/18/98   CUMBERLAND                     WATER OVER ROAD ALONG HWY.68

817 PM     GRAYSVILLE                TN   FLOODING
04/18/98   RHEA                           NUMEROUS ROADS AND CREEKS
                                          FLOODED

925 PM     POPLAR CREEK              TN   FLOODING
04/18/98   ROANE                          LOW LYING AREAS FLOODED AT
                                          BLAIR RD. AND POPLAR CREEK
                                          AND HWY.29 FLOODED

945 PM     CLINTON                   TN   FLOODING
04/18/98   ANDERSON                       WATER OVER ROADS WEST SIDE
                                          OF CLINTON

1008 PM    KNOXVILLE                 TN   FLOODING
04/18/98   KNOX                           ROAD NEAR WEST TOWN MALL
                                          FLOODED; 2 INCHES OF RAIN
                                          AN HOUR NEAR KARNS

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 18, 8:07 PM EDTFlash Flood WarningMRXRhea4 hr
Apr 18, 8:24 PM EDTFlash Flood WarningMRXHamilton, Meigs6 hr
Apr 18, 8:24 PM EDTFlash Flood WarningMRXRoane6 hr
Apr 18, 8:33 PM EDTSevere Thunderstorm WarningMRXRoane47 min
Apr 18, 8:35 PM EDTSevere Thunderstorm WarningMRXHamilton, Meigs, Rhea65 min
Apr 18, 8:50 PM EDTFlash Flood WarningMRXAnderson, Campbell, Scott5 hr
Apr 18, 8:50 PM EDTFlash Flood WarningMRXClaiborne5 hr
Apr 18, 9:01 PM EDTSevere Thunderstorm WarningMRXMcMinn34 min
Apr 18, 9:09 PM EDTSevere Thunderstorm WarningMRXAnderson51 min
Apr 18, 9:13 PM EDTFlash Flood WarningMRXBradley, McMinn, Polk6 hr
Apr 18, 9:28 PM EDTSevere Thunderstorm WarningMRXKnox, Union47 min
Apr 18, 9:46 PM EDTFlash Flood WarningMRXKnox, Union5 hr
Apr 18, 9:46 PM EDTFlash Flood WarningMRXLoudon, Monroe5 hr
Apr 18, 9:59 PM EDTSevere Thunderstorm WarningMRXBradley, Hamilton, Polk51 min
Apr 18, 10:14 PM EDTSevere Thunderstorm WarningMRXClaiborne, Grainger31 min
Apr 18, 10:29 PM EDTSevere Thunderstorm WarningMRXMonroe46 min
Apr 18, 10:30 PM EDTSevere Thunderstorm WarningMRXHancock35 min
Apr 18, 10:41 PM EDTTornado WarningMRXMonroe49 min
Apr 18, 10:48 PM EDTSevere Thunderstorm WarningMRXPolk32 min
Apr 18, 10:58 PM EDTSevere Thunderstorm WarningMRXGrainger, Hamblen, Jefferson32 min
Apr 18, 11:04 PM EDTFlash Flood WarningMRXCocke, Grainger, Hamblen, Hawkins, Jefferson5 hr
Apr 18, 11:04 PM EDTFlash Flood WarningMRXCumberland, Morgan5 hr
Apr 18, 11:04 PM EDTFlash Flood WarningMRXHancock5 hr
Apr 18, 11:04 PM EDTFlash Flood WarningMRXRhea5 hr
Apr 18, 11:26 PM EDTSevere Thunderstorm WarningMRXMonroe34 min
Apr 18, 11:41 PM EDTSevere Thunderstorm WarningMRXBlount34 min
Apr 19, 1:47 AM EDTFlash Flood WarningMRXGrainger, Hamblen, Hancock, Hawkins8 hr
Apr 19, 1:47 AM EDTFlash Flood WarningMRXBradley, Hamilton, McMinn, Meigs, Polk8 hr
Apr 19, 1:47 AM EDTFlash Flood WarningMRXBlount, Loudon, Monroe8 hr
Apr 19, 1:47 AM EDTFlash Flood WarningMRXCumberland, Rhea, Roane8 hr
Apr 19, 1:47 AM EDTFlash Flood WarningMRXAnderson, Campbell, Claiborne, Scott, Union8 hr
Apr 19, 1:47 AM EDTFlash Flood WarningMRXFentress, Morgan8 hr
Apr 19, 1:47 AM EDTFlash Flood WarningMRXJefferson, Knox, Sevier8 hr
Apr 19, 1:47 AM EDTFlash Flood WarningMRXCocke8 hr
Apr 19, 3:19 AM EDTSevere Thunderstorm WarningMRXSevier61 min
Apr 19, 7:03 AM EDTFlash Flood WarningMRXCarter, Johnson, Sullivan3 hr
Apr 19, 7:03 AM EDTFlash Flood WarningMRXGreene, Unicoi, Washington3 hr
Apr 19, 9:39 AM EDTFlash Flood WarningMRXBlount, Sevier8 hr
Apr 19, 9:45 AM EDTFlash Flood WarningMRXKnox, Loudon, McMinn, Monroe8 hr
Apr 19, 9:45 AM EDTFlash Flood WarningMRXClaiborne, Grainger, Hancock, Union8 hr

Nearby

Flash Flood Warnings in Tennessee, 1998Every flash flood 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.