Alert archive / Tennessee / Flash Flood Warnings in 1998

Flash Flood Warning 73, NWS Morristown, TN

May 27, 1998Jefferson County, Tennessee

NWS Morristown, TN issued this flash flood warning at May 27, 1998, 5:32 AM EDT for Jefferson County, Tennessee. It was in force for 2 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
May 27, 1998, 5:32 AM EDT (09:32 UTC)
Expired
May 27, 1998, 8:00 AM EDT
In force
2 hr
Issued by
NWS Morristown, TN
Area
Whole counties

County Jefferson County, TN

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 9.5 hours before the alert went out and 284 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 1998-05-27Temperature 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 1998-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 165 square meters per square second.19395878Sfc1 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
881 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
165 m²/s²
0-3 km storm-relative helicity
301 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 270932
FFWMRX
TNC089-271200-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE KNOXVILLE/TRI-CITIES TN
532 AM EDT WED MAY 27 1998

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

* FLASH FLOOD WARNING FOR...
  SOUTHERN JEFFERSON COUNTY IN EASTERN TENNESSEE

* UNTIL 800 AM EDT

* AT 530 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THAT CLUSTERS OF THUNDERSTORMS WITH VERY HEAVY RAIN WERE LOCATED
  OVER SOUTHERN JEFFERSON COUNTY...MOVING NORTHEAST AT 35 MPH.

* EXCESSIVE RAINFALL AT THE RATE OF 1 TO 2 INCHES PER HOUR WILL
  PRODUCE FLOODING ACROSS SOUTHERN JEFFERSON COUNTY MAINLY TO THE
  SOUTH OF A DANDRIDGE TO WHITE PINE LINE THROUGH 800 AM EDT.

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

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 May 27, 2:54 AM EDT, 2 hours 38 minutes earlier.

Area forecast discussion, May 27, 2:54 AM EDT, 2 hours 38 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KNOXVILLE/TRI-CITIES TN
254 AM EDT WED MAY 27 1998

ALL THREE MODELS IN FAIRLY CLOSE AGREEMENT WITH THE UPPER LEVEL
SHORTWAVE MOVING THROUGH THE AREA BY 00Z TONIGHT.  HOWEVER...HAVE
LEANED TOWARDS A NGM SOLUTION AS IT HAD A BETTER HANDLE ON THE CURRENT
PRECIPITATION.  BOTH KMRX AND KHTX SHOWING SHOWERS AND THUNDERSTORMS
DEVELOPING ALONG PREVIOUS OUTFLOW BOUNDARIES...AND THE SHORTWAVE
MOVING INTO THE AREA.  UPPER LEVEL DIVERGENCE IS WELL PRONOUNCED ALSO
OVER THE AREA.

MAIN CONCERN NOW FOCUSES IN ON FLASH FLOOD POTENTIAL ACROSS THE AREA.
PRECIP WATER VALUES SHOW NEAR FLASH FLOOD POTENTIAL...BUT SINCE THE
MODELS ARE SHOWING THE SYSTEM TO BE A FAST MOVER...DO NOT THINK FLASH
FLOODING WILL BE WIDE SPREAD.  THERE IS A GOOD CHANCE THAT SOME AREAS
MAY RECIEVE LOCALLY HEAVY RAIN...SO WOULD LIKE TO SEE THAT IN THE
ZONES. ATMOSPHERE NOT AS UNSTABLE AS PREVIOUS DAYS...SO SEVERE WEATHER
CHANCES ARE SLIGHT.  GIVEN THE ABOVE WOULD NOT LIKE TO EXTEND FLASH
FLOOD WATCH FOR TODAY.

ACROSS THE ENTIRE CWA FOR TODAY WOULD LIKE TO GO WITH LIKELY POPS
(60 %) AS PRECIPITATION CONTINUES TO INCREASE IN AREAL COVERAGE...AND
UPPER LEVEL SUPPORT MOVES INTO THE AREA AROUND 12Z. RAPID CLEARING
TREND IS EXPECTED AFTER SUNSET TODAY...SO WOULD LIKE ZONES WORDED AS
FOLLOWS.  AM GOING WITH FWC NUMBERS FOR HIGHS AND LOWS.

TODAY...MOSTLY CLOUDY WITH A 60 PERCENT CHANCE OF SHOWERS AND
THUNDERSTORMS. HIGHS 80 TO 85. SOUTHWEST WIND 5 TO 10 MPH.

TONIGHT...DECREASING CLOUDINESS WITH AREAS OF FOG DEVELOPING. LOWS
NEAR 60. LIGHT WINDS.
--WITH RADITIONAL COOLING AND SIGNIFICANT RAINFALL FOG LIKELY
OVERNIGHT--

WEDNESDAY...MOSTLY SUNNY. HIGHS 80 TO 85. LIGHT WINDS.

THANKS MEM...FOR COORDINATION CALL...

PDK

The office that day

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

IssuedProductOfficeCountiesLasted
May 27, 5:52 AM EDTFlash Flood WarningMRXCocke3 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.