Alert archive / Texas / Flash Flood Warnings in 1997

Flash Flood Warning 176, NWS Fort Worth, TX

December 20, 19974 counties in Texas

NWS Fort Worth, TX issued this flash flood warning at Dec 20, 1997, 7:40 PM CST for 4 counties in Texas. 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
Dec 20, 1997, 7:40 PM CST (01:40 UTC)
Expired
Dec 20, 1997, 11:30 PM CST
In force
4 hr
Issued by
NWS Fort Worth, TX
Area
Whole counties

Counties Collin County, TX, Dallas County, TX, Hunt County, TX, Rockwall County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 92 km from the middle of the area, began a volume at 01:42 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

Shreveport, LA (KSHV), launched 00:00Z, 1.7 hours before the alert went out and 260 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, Shreveport, LA at 00:00Z on 1997-12-21Temperature 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 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 00:00Z on 1997-12-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 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
780 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
111 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 KFTW 210140
FFWFTW
TXC085-113-231-397-439-210530-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FORT WORTH TX
740 PM CST SAT DEC 20 1997
 
THE NATIONAL WEATHER SERVICE IN FORT WORTH HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 1130 PM CST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
   ...COLLIN COUNTY...DALLAS COUNTY...HUNT COUNTY
   ...ROCKWALL COUNTY...TARRANT COUNTY
 
AT 740 PM...DOPPLER RADAR ESTIMATED TOTAL RAINFALL AMOUNTS OF 2 1/2 TO 5
INCHES OVER DALLAS...COLLIN...HUNT...ROCKWALL AND MUCH OF TARRANT
COUNTY SO FAR TODAY. SOME MINOR FLOODING HAS DEVELOPED OVER THE USUAL
FLOOD-PRONE AREAS...BUT WITH AN ADDITIONAL 1 TO 3 INCHES EXPECTED
TONIGHT...FLOODING CONDITIONS MAY BECOME MORE WIDESPREAD AND MORE
DANGEROUS.
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF FLOODS AND FLASH FLOODS.  IF FLASH 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 Fort Worth, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 20, 6:05 PM CSTSevere Thunderstorm WarningFWDMcLennan55 min
Dec 20, 6:09 PM CSTFlash Flood WarningFWDBosque, Ellis, Hill, Johnson, McLennan5 hr
Dec 20, 6:09 PM CSTFlash Flood WarningFWDBell, Coryell5 hr
Dec 20, 7:40 PM CSTFlash Flood WarningFWDTarrant4 hr
Dec 20, 8:30 PM CSTFlash Flood WarningFWDFalls3 hr
Dec 20, 8:52 PM CSTFlash Flood WarningFWDMilam3 hr
Dec 20, 9:01 PM CSTFlash Flood WarningFWDLimestone, Navarro3 hr
Dec 20, 9:01 PM CSTFlash Flood WarningFWDKaufman3 hr
Dec 20, 9:11 PM CSTTornado WarningFWDMilam64 min
Dec 20, 9:35 PM CSTFlash Flood WarningFWDFannin, Grayson2 hr
Dec 20, 9:35 PM CSTFlash Flood WarningFWDKaufman2 hr
Dec 20, 9:55 PM CSTFlash Flood WarningFWDHenderson, Van Zandt4 hr
Dec 20, 9:55 PM CSTFlash Flood WarningFWDDelta, Hopkins, Lamar4 hr
Dec 20, 9:55 PM CSTFlash Flood WarningFWDRains4 hr
Dec 20, 11:12 PM CSTFlash Flood WarningFWDBosque, Ellis, Hill, Johnson2 hr
Dec 20, 11:12 PM CSTFlash Flood WarningFWDBell, Coryell, Falls, McLennan2 hr
Dec 20, 11:29 PM CSTFlash Flood WarningFWDCollin, Dallas, Rockwall, Tarrant2 hr
Dec 20, 11:29 PM CSTFlash Flood WarningFWDHunt2 hr
Dec 20, 11:51 PM CSTFlash Flood WarningFWDFannin, Grayson3 hr

Nearby

Flash Flood Warnings in Texas, 1997Every flash flood warning in 1997

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.