Alert archive / Texas / Flash Flood Warnings in 1998

Flash Flood Warning 113, NWS Houston/Galveston, TX

November 12, 1998Austin County, Colorado County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Nov 12, 1998, 1:34 PM CST for Austin County, Colorado County, Texas. It was in force for 3 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
Nov 12, 1998, 1:34 PM CST (19:34 UTC)
Expired
Nov 12, 1998, 4:30 PM CST
In force
3 hr
Issued by
NWS Houston/Galveston, TX
Area
Whole counties

Counties Austin County, TX, Colorado County, TX

The radar

The Houston radar (KHGX), 132 km from the middle of the area, began a volume at 19:37 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

Corpus Christi, TX (KCRP), launched 12:00Z, 7.6 hours before the alert went out and 243 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, Corpus Christi, TX at 12:00Z on 1998-11-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1921 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, Corpus Christi, TX at 12:00Z on 1998-11-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 193 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
1921 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
472 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
193 m²/s²
0-3 km storm-relative helicity
262 m²/s²
Significant tornado parameter
2.6
Supercell composite
14.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KHOU 121934
FFWHOU
TXC015-089-477-122230-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
134 PM CST THU NOV 12 1998

THE NATIONAL WEATHER SERVICE IN HOUSTON/GALVESTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN AUSTIN COUNTY IN SOUTH CENTRAL TEXAS
  NORTHERN COLORADO COUNTY IN SOUTH CENTRAL TEXAS
  WASHINGTON COUNTY IN SOUTHEASTERN TEXAS

* UNTIL 430 PM CST

* AT 125 PM CST... NATIONAL WEATHER SERVICE DOPPLER RADAR
  CONTINUED TO INDICATE NUMEROUS THUNDERSTORMS WITH HEAVY RAIN
  DEVLOPING TO THE SOUTHWEST OF THESE COUNTIES...MOVING NORTHEAST
  AT 25 MPH.

* AN ADDITIONAL 2 INCHES OF RAIN IS POSSIBLE DURING THE NEXT
  3 HOURS ADDING TO THE 5 TO 6 INCHES OF RAIN THAT FELL ACROSS THE
  AREA THIS MORNING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROADWAY.
THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY.
VEHICLES CAUGHT IN RISING WATER SHOULD BE AB|ANDONED QUICKLY.  MOVE
TO HIGHER GROUND.

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 Houston/Galveston, TX wrote its last area forecast discussion before this flash flood warning went out at Nov 12, 9:20 AM CST, 4 hours 14 minutes earlier.

Area forecast discussion, Nov 12, 9:20 AM CST, 4 hours 14 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
920 AM CST THU NOV 12 1998

CELL TRAINING OCCURRING THIS MORNING ACROSS WESTERN AND NORTHERN
SECTIONS OF FA...APPEARS THAT BAND IS SHIFTING SOUTHWARD AND LIKELY
TO CONVERGE WITH DEVELOPING CELLS MOVING NORTH ACROSS COASTAL
COUNTIES.  FLOOD EVENT INTO FRIDAY NIGHT IS EXPECTED FOR SOUTHEAST
TEXAS AS MAIN UPPER LEVEL ENERGY IS STILL OVER SW U.S./ MEX.
TROPICAL MOISTURE WILL CONTINUE TO PUSH NORTHWARD WITH NEAR 2 INCH
PW EXPECTED ACROSS ALL OF SOUTHEAST TEXAS BY TONIGHT. WILL UPDATE
RAINFALL AMOUNTS WITH FLASH FLOOD STATEMENT TO INCREASE EXPECTED
TOTALS DUE TO EXTREMELY HIGH MOISTURE LEVELS...UPPER LEVEL
DIVERGENCE...AND SLOW MOVEMENT OF MID-UPPER LEVEL TROF.

ONLY CHANGES TO ZONES WILL BE TO UP POPS 1ST PERIOD AND CHANGE
WORDING TO SHWRS AND TSTMS...AS EXPECT ALL OF FORECAST AREA TO GET
RAINFALL BY THIS AFTERNOON.

CCFHOU...
CLL TT 065/058 065$/054 065 +++
IAH TT 065/060 065/059 065 +++
GLS TT 070/067 069/066 069 +++

.HOU...FLASH FLOOD WATCH ENTIRE CWA TODAY THROUGH FRIDAY.
       SMALL CRAFT ADVISORY MATAGORDA SHIP CHANNEL TO HIGH ISLAND.

33/40

The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 12, 7:53 AM CSTFlash Flood WarningHGXAustin, Washington3 hr
Nov 12, 9:33 AM CSTFlash Flood WarningHGXGrimes, Montgomery, Waller3 hr
Nov 12, 10:32 AM CSTFlash Flood WarningHGXAustin, Colorado, Washington3 hr
Nov 12, 11:21 AM CSTFlash Flood WarningHGXPolk, San Jacinto3 hr
Nov 12, 12:25 PM CSTFlash Flood WarningHGXGrimes, Montgomery, Waller2 hr
Nov 12, 1:34 PM CSTFlash Flood WarningHGXWashington3 hr
Nov 12, 3:15 PM CSTFlash Flood WarningHGXLiberty, Montgomery, Polk, San Jacinto4 hr
Nov 12, 3:15 PM CSTFlash Flood WarningHGXHarris, Waller4 hr
Nov 12, 4:41 PM CSTFlash Flood WarningHGXAustin, Washington3 hr
Nov 12, 4:41 PM CSTFlash Flood WarningHGXColorado, Fort Bend, Jackson, Wharton3 hr

Nearby

Flash Flood Warnings in Texas, 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.