Alert archive / North Carolina / Flash Flood Warnings in 1999

Flash Flood Warning 5, NWS Morristown, TN

May 7, 1999Cherokee County, North Carolina

NWS Morristown, TN issued this flash flood warning at May 7, 1999, 5:35 PM EDT for Cherokee County, North Carolina. It was in force for 4 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 7, 1999, 5:35 PM EDT (21:35 UTC)
Expired
May 7, 1999, 9:35 PM EDT
In force
4 hr
Issued by
NWS Morristown, TN
Area
Whole counties

County Cherokee County, NC

The radar

The Knoxville radar (KMRX), 130 km from the middle of the area, began a volume at 21:36 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 9.6 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-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 12:00Z on 1999-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 362 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 12:00Z on 1999-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 square meters per square second.1939Sfc1 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
362 J/kg
Mixed-layer CIN
-60 J/kg
Mixed-layer LCL
564 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
0 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 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 7, 2:29 PM EDT, 3 hours 6 minutes earlier.

Area forecast discussion, May 7, 2:29 PM EDT, 3 hours 6 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
229 PM EDT FRI MAY 7 1999

SATELLITE SHOWS TWO DISTINCT S/WV ROTATING TOWARD THE SOUTHERN
APPALACHIANS. FIRST WAVE IS OVER W KS/MO AND THE OTHER MORE
SIGNIFICANT WAVE IS MOVING ACROSS AR. THESE FEATURES ARE
DEPICTED QUITE WELL BY THE RUC AND ETA/NGM MODELS. THESE WAVES
WILL MOVE ACROSS THE REGION LATE TODAY AND OVERNIGHT.

ALREADY...HTX AND MRX RADARS ARE SHOWING AN INCREASE IN SHOWERS
AND THUNDERSTORMS OVER NORTHERN GEORGIA INTO WESTERN NORTH CAROLINA
AND SOUTHEAST TENNESSEE.  MODELS SHOW THIS COVERAGE OF CONVECTION
MOVING NORTHEAST INTO SOUTHWEST VIRGINIA AND NORTHEAST TENNESSEE
LATE THIS AFTERNOON AND EVENING. WILL HAVE GOOD/LIKELY CHANCES OF
SHOWERS AND THUNDERSTORMS...MAINLY BEFORE MIDNIGHT.

DUE TO THE RELATIVELY HIGH PW AND SOME TRAINING OF CELLS...
LOCALLLIZED FLASH FLOODING IS POSSIBLE.  ALSO...ISOLATED SEVERE
THREAT WITH MAIN PROBLEM BEING MARGINAL SEVERE HAIL AND
DOWNBURST WINDS.

DEPENDING ON HOW SOON STORMS AND CLOUDS MOVE OUT...ANOTHER ROUND
OF MORNING FOG IS A DISTINCT POSSIBILITY.  SOME OF THE FOG COULD
BE LOCALLY DENSE.  SHORT-WAVE WILL EXIT THE AREA BY SATURDAY MORNING
ALLOWING DRIER AIR TO FILTER INTO THE REGION PRODUCING A MOSTLY
SUNNY DAY FOR TOMORROW.

ANOTHER WEAKER S/WV WITH LIMITED MOISTURE WILL MOVE ACROSS THE
TENNESSEE VALLEY FOR LATE SATURDAY NIGHT AND SUNDAY MORNING. WILL
CALL FOR PARTLY CLOUDY SKIES...BUT KEEP PRECIPITATION CHANCES OUT
OF THE FORECAST. SKY WILL BECOMING MOSTLY SUNNY AGAIN BY SUNDAY
AFTERNOON AS WAVE PASSES.

THE FOLLOWING NUMBERS ARE FOR COORDINATION PURPOSES ONLY:

CHA UU 053/080 052/085 055 15300
TYS UB 052/077 052/081 054 15400
TRI UB 050/073 049/077 051 15600
OQT UB 051/078 051/081 053 15300

DH

In the hours before

Special weather statement, May 7, 2:02 PM EDT, 3 hours 33 minutes before
NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-005-
006-008-080400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
202 PM EDT FRI MAY 7 1999

...THUNDERSTORMS WITH GUSTY WINDS AND VERY HEAVY RAINS FRIDAY
   AFTERNOON AND EVENING...

A COLD FRONT LYING ACROSS THE TENNESSEE VALLEY FROM SOUTHWEST TO
NORTHEAST...TOGETHER WITH AN UPPER AIR DISTURBANCE IS TRIGGERING
THUNDERSTORMS OVER NORTHERN GEORGIA AND WESTERN NORTH CAROLINA.
THESE STORMS ARE MOVING INTO SOUTHEAST TENNESSEE AND WILL AFFECT THE
GREAT SMOKY MOUNTAINS.

GENERALLY...THESE STORMS WILL PRODUCE DANGEROUS LIGHTNING...VERY
HEAVY RAIN...AND STRONG GUSTY WINDS.  AN ISOLATED THUNDERSTORM MAY
BECOME SEVERE WITH LARGE HAIL AND DAMAGING WINDS.

AS THE UPPER AIR DISTURBANCE APPROACHES THE AREA FROM THE WEST...
THUNDERSTORMS WILL INCREASE IN COVERAGE AND STRENGTH.  MOST OF THE
STORMS WILL EXIT NORTHEAST TENNESSEE AND EXTREME SOUTHWEST VIRGINIA
AFTER MIDNIGHT.

STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL SHOULD BE PREPARED
FOR ACTIVATION. PLEASE PAY ATTENTION TO NOAA WEATHER RADIO...AND
COMMERCIAL TELEVISION AND RADIO FOR THE LATEST INFORMATION.

BB
Special weather statement, May 7, 2:02 PM EDT, 3 hours 33 minutes before
NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-005-
006-008-080400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
202 PM EDT FRI MAY 7 1999

...THUNDERSTORMS WITH GUSTY WINDS AND VERY HEAVY RAINS FRIDAY
   AFTERNOON AND EVENING...

A COLD FRONT LYING ACROSS THE TENNESSEE VALLEY FROM SOUTHWEST TO
NORTHEAST...TOGETHER WITH AN UPPER AIR DISTURBANCE IS TRIGGERING
THUNDERSTORMS OVER NORTHERN GEORGIA AND WESTERN NORTH CAROLINA.
THESE STORMS ARE MOVING INTO SOUTHEAST TENNESSEE AND WILL AFFECT THE
GREAT SMOKY MOUNTAINS.

GENERALLY...THESE STORMS WILL PRODUCE DANGEROUS LIGHTNING...VERY
HEAVY RAIN...AND STRONG GUSTY WINDS.  AN ISOLATED THUNDERSTORM MAY
BECOME SEVERE WITH LARGE HAIL AND DAMAGING WINDS.

AS THE UPPER AIR DISTURBANCE APPROACHES THE AREA FROM THE WEST...
THUNDERSTORMS WILL INCREASE IN COVERAGE AND STRENGTH.  MOST OF THE
STORMS WILL EXIT NORTHEAST TENNESSEE AND EXTREME SOUTHWEST VIRGINIA
AFTER MIDNIGHT.

STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL SHOULD BE PREPARED
FOR ACTIVATION. PLEASE PAY ATTENTION TO NOAA WEATHER RADIO...AND
COMMERCIAL TELEVISION AND RADIO FOR THE LATEST INFORMATION.

BB
Local storm report, May 7, 5:30 PM EDT, 5 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 7, 3:01 PM EDTSevere Thunderstorm WarningMRXGrainger, Hamblen, Jefferson64 min
May 7, 3:01 PM EDTSevere Thunderstorm WarningMRXSevier64 min
May 7, 3:24 PM EDTSevere Thunderstorm WarningMRXSullivan, Washington61 min
May 7, 3:38 PM EDTSevere Thunderstorm WarningMRXClaiborne, Hancock62 min
May 7, 3:51 PM EDTSevere Thunderstorm WarningMRXUnicoi64 min
May 7, 4:03 PM EDTTornado WarningMRXHancock62 min
May 7, 4:06 PM EDTSevere Thunderstorm WarningMRXBlount, Knox64 min
May 7, 4:17 PM EDTSevere Thunderstorm WarningMRXJohnson48 min
May 7, 4:39 PM EDTSevere Thunderstorm WarningMRXCarter51 min
May 7, 4:42 PM EDTSevere Thunderstorm WarningMRXClaiborne, Union63 min
May 7, 5:05 PM EDTSevere Thunderstorm WarningMRXJohnson50 min
May 7, 5:22 PM EDTSevere Thunderstorm WarningMRXBradley48 min
May 7, 6:33 PM EDTSevere Thunderstorm WarningMRXAnderson, Knox47 min
May 7, 2:51 PM EDTSevere Thunderstorm WarningMRXCherokee49 min
May 7, 4:10 PM EDTSevere Thunderstorm WarningMRXClay30 min

Nearby

Flash Flood Warnings in North Carolina, 1999Every flash flood warning in 1999

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; radar from the NEXRAD Level II archive.