Alert archive / Texas / Flash Flood Warnings in 1998

Flash Flood Warning 102, NWS Houston/Galveston, TX

October 18, 1998Colorado County, Wharton County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Oct 18, 1998, 12:02 PM CDT for Colorado County, Wharton County, 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
Oct 18, 1998, 12:02 PM CDT (17:02 UTC)
Expired
Oct 18, 1998, 4:00 PM CDT
In force
4 hr
Issued by
NWS Houston/Galveston, TX
Area
Whole counties

Counties Colorado County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 125 km from the middle of the area, began a volume at 17:02 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, 5.0 hours before the alert went out and 213 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 1998-10-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2494 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 1998-10-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 77 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
2494 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
515 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
77 m²/s²
0-3 km storm-relative helicity
111 m²/s²
Significant tornado parameter
0.7
Supercell composite
4.7

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 Houston/Galveston, TX wrote its last area forecast discussion before this flash flood warning went out at Oct 18, 9:50 AM CDT, 2 hours 12 minutes earlier.

Area forecast discussion, Oct 18, 9:50 AM CDT, 2 hours 12 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
950 AM CDT SUN OCT 18 1998

SLOW MVG CF APPEARS TO BE JUST SOUTH OF A SAT TO AUS TO TYR LN.
EXPECT FNT TO MOVE INTO CLL AREA ARND NOON.  UPR ANALYSIS AT 500MB
THIS MRNG SHOWS WEAK S/E ENERGY RIDING UP FM S TX WHILE 200MB SHOWS
GOOD DIFFLUENCE WITH REMNANTS OF RIGHT JET ENTRANCE OVER EAST CNTRL
TX AND MAIN JET AXIS ALNG A OK-MO-IL LINE AS IT PULLS OFF TO NE.
850MB FNT STILL WELL BACK OVR TX PNHDL WITH 20-35KT SRLY INFLOW
STILL CONCENTRATED FROM BRO TO NE TX.  EXPECT UPR DYNAMICS TO CONT
INTERACTING WITH WARM/MOIST AIRMASS ACRS AREA TO PRODUCE WIDESPREAD
RAIN WITH EMBEDDED SHWRS/TSTMS ACRS MUCH OF FA TDY.  RADAR SHOWS
MAIN AXIS OF HEAVIER RAINS NOW ACRS THE FIRST TWO TEERS OF COUNTIES
NEAR THE COAST AND SLWLY SAGGING SWRD.  IF THIS TREND CONTS...
HOPEFULLY THE HEAVIER RAINS WILL PUSH OF THE COAST DURING THE AFTN.
HOWEVER...CONSIDERING THE SLOW MVMNT OF FNT AND EXPECTED STALLING OF
FNT ACRS FA LATER THIS AFTN...WILL CONT WITH 100% CHC RAINS AND FFA
THRU TDY.  WILL TWEAK COASTAL COUNTIES TO CLDY SKIES AND 100% CHC
RAIN AND LOWER ALL HIGH TMPS A CAT OR TWO.  SHUD CONT TO MENTION
PSBL SVR IN ACRS CNTRL AND COASTAL ZONES AS STILL GETTING ISOLATED
SPIN UPS WITH TRAINING CELLS AND THIS TREND SEEMS TO BE SUPPORTED BY
12Z CPR HODO.  FLOOD PROBLEMS CONT MOST AREAS.  39

PRELIMS...
CLL  C/C C/C  73/64 76/61 +776  HVY RAINS
IAH  C/C C/C  75/67 78/64 +776  HVY RAINS/POSSIBLY SVR
GLS  C/C C/C  80/76 80/72 +776  HVY RAINS/POSSIBLY SVR

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 17, 7:08 PM CDTTornado WarningHGXColorado57 min
Oct 17, 8:09 PM CDTSevere Thunderstorm WarningHGXColorado, Wharton61 min
Oct 17, 8:31 PM CDTFlash Flood WarningHGXBrazos, Grimes, Madison, Washington4 hr
Oct 17, 8:31 PM CDTFlash Flood WarningHGXAustin, Colorado4 hr
Oct 17, 8:31 PM CDTFlash Flood WarningHGXHouston4 hr
Oct 17, 9:17 PM CDTSevere Thunderstorm WarningHGXFort Bend, Wharton63 min
Oct 17, 10:52 PM CDTFlash Flood WarningHGXWharton4 hr
Oct 17, 11:57 PM CDTFlash Flood WarningHGXAustin, Colorado3 hr
Oct 18, 12:49 AM CDTTornado WarningHGXHarris, Waller51 min
Oct 18, 2:55 AM CDTFlash Flood WarningHGXAustin, Colorado, Wharton5 hr
Oct 18, 2:55 AM CDTFlash Flood WarningHGXWaller5 hr
Oct 18, 3:36 AM CDTTornado WarningHGXHarris, Waller39 min
Oct 18, 4:10 AM CDTTornado WarningHGXHarris55 min
Oct 18, 4:38 AM CDTFlash Flood WarningHGXHarris, Montgomery3 hr
Oct 18, 5:21 AM CDTFlash Flood WarningHGXBrazos, Houston, Madison5 hr
Oct 18, 5:21 AM CDTFlash Flood WarningHGXBurleson, Washington5 hr
Oct 18, 5:59 AM CDTTornado WarningHGXLiberty, Montgomery31 min
Oct 18, 6:10 AM CDTTornado WarningHGXWaller35 min
Oct 18, 6:33 AM CDTTornado WarningHGXHarris57 min
Oct 18, 7:12 AM CDTFlash Flood WarningHGXLiberty3 hr
Oct 18, 7:29 AM CDTFlash Flood WarningHGXJackson3 hr
Oct 18, 7:40 AM CDTTornado WarningHGXHarris40 min
Oct 18, 7:49 AM CDTTornado WarningHGXLiberty61 min
Oct 18, 8:06 AM CDTFlash Flood WarningHGXAustin, Colorado, Wharton4 hr
Oct 18, 8:06 AM CDTFlash Flood WarningHGXHarris, Montgomery, Waller4 hr
Oct 18, 8:17 AM CDTFlash Flood WarningHGXSan Jacinto4 hr
Oct 18, 8:17 AM CDTFlash Flood WarningHGXFort Bend4 hr
Oct 18, 9:32 AM CDTTornado WarningHGXChambers48 min
Oct 18, 10:01 AM CDTFlash Flood WarningHGXBrazos, Madison, Washington4 hr
Oct 18, 10:01 AM CDTFlash Flood WarningHGXLiberty4 hr
Oct 18, 10:01 AM CDTFlash Flood WarningHGXJackson4 hr
Oct 18, 10:23 AM CDTTornado WarningHGXChambers32 min
Oct 18, 10:41 AM CDTFlash Flood WarningHGXChambers3 hr
Oct 18, 10:57 AM CDTTornado WarningHGXChambers63 min
Oct 18, 10:58 AM CDTTornado WarningHGXLiberty62 min
Oct 18, 11:24 AM CDTFlash Flood WarningHGXBrazoria, Galveston3 hr
Oct 18, 12:02 PM CDTFlash Flood WarningHGXAustin, Fort Bend, Harris, Montgomery, Waller4 hr
Oct 18, 12:02 PM CDTFlash Flood WarningHGXSan Jacinto4 hr
Oct 18, 12:23 PM CDTTornado WarningHGXChambers32 min
Oct 18, 2:07 PM CDTFlash Flood WarningHGXChambers, Liberty3 hr
Oct 18, 2:19 PM CDTFlash Flood WarningHGXJackson4 hr
Oct 18, 6:07 PM CDTFlash Flood WarningHGXJackson3 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.