Alert archive / Tennessee / Flash Flood Warnings in 1998

Flash Flood Warning 21, NWS Memphis, TN

July 30, 1998Lake County, Obion County, Tennessee

NWS Memphis, TN issued this flash flood warning at Jul 30, 1998, 2:46 AM CDT for Lake County, Obion County, Tennessee. 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
Jul 30, 1998, 2:46 AM CDT (07:46 UTC)
Expired
Jul 30, 1998, 6:50 AM CDT
In force
4 hr
Issued by
NWS Memphis, TN
Area
Whole counties

Counties Lake County, TN, Obion County, TN

The radar

The Paducah radar (KPAH), 94 km from the middle of the area, began a volume at 07:48 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

Little Rock, AR (KLZK), launched 00:00Z, 7.8 hours before the alert went out and 178 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, Little Rock, AR at 00:00Z on 1998-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2265 joules per kilogram.LCLEL10008507005003002001001 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, Little Rock, AR at 00:00Z on 1998-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 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
2265 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
1731 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
154 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMEM 300745
FFWMEM
TNC033-045-053-095-097-131-183-301150-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MEMPHIS TN
246 AM CDT THU JUL 30 1998

THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CROCKETT COUNTY IN WESTERN TENNESSEE
  DYER COUNTY IN WESTERN TENNESSEE
  GIBSON COUNTY IN WESTERN TENNESSEE
  LAKE COUNTY IN WESTERN TENNESSEE
  LAUDERDALE COUNTY IN WESTERN TENNESSEE
  OBION COUNTY IN WESTERN TENNESSEE
  WEAKLEY COUNTY IN WESTERN TENNESSEE

* UNTIL 650 AM CDT

* AT 240 AM... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LARGE AREA OF THUNDERSTORMS WITH VERY HEAVY RAIN OVER THE
  MISSOURI BOOTHEEL MOVING EAST AT 15 MPH. THE GROUND IS SATURATED
  FROM PREVIOUS RAIN OVER THE WARNED COUNTIES..AND THUNDERSTORMS THIS
  MORNING WILL LIKELY PRODUCE RAINFALL NEAR 2 INCHES WITH LOCAL
  AMOUNTS OVER 3 INCHES.

.BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZ
E THE
DANGERS OF FLASH FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY.
MOVE UP TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO
FLOODING WHEN WATER BEGINS RISING.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 2:46 AM CDTFlash Flood WarningMEGCrockett, Dyer, Gibson, Lauderdale4 hr
Jul 30, 2:46 AM CDTFlash Flood WarningMEGWeakley4 hr
Jul 30, 3:06 AM CDTTornado WarningMEGDyer29 min
Jul 30, 3:11 AM CDTSevere Thunderstorm WarningMEGLauderdale34 min

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; radar from the NEXRAD Level II archive.