Flash Flood Warning 99, NWS Houston/Galveston, TX

Issued

Oct 18, 1998, 11:24 AM CDT (16:24 UTC)

Expired

Oct 18, 1998, 2:20 PM CDT

In force

3 hr

Issued by

NWS Houston/Galveston, TX

Area

Whole counties

Counties Brazoria County, TX, Galveston County, TX

The Houston radar (KHGX), 27 km from the middle of the area, began a volume at 16:26 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.

000 
TTAA00 KHOU 181624
FFWHOU
TXC039-167-181920-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1124 AM CDT SUN OCT 18 1998

THE NATIONAL WEATHER SERVICE IN HOUSTON/GALVESTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BRAZORIA COUNTY IN SOUTHEASTERN TEXAS
  GALVESTON COUNTY IN SOUTHEASTERN TEXAS

* UNTIL 220 PM CDT

* AT 1120 AM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR
  INDICATED A BAND OF STRONG SHOWERS AND THUNDERSTORM WITH VERY
  HEAVY RAIN TRAINING ACROSS THE NORTHERN PORTIONS OF BRAZORIA AND
  GALVESTON COUNTIESS. THE BAND WAS SLOWLY SAGGING TO THE SOUTHEAST
  WHILE THE STORMS WITHIN THE BAND WERE MOVING NORTHEAST AT 20 MPH.

* THE BAND WILL CONTINUE TO SPREAD HEAVY RAINS ACROSS THE
  WARNED AREA AS IT SAGS SOUTHWARD WITH WIDESPREAD RAINFALL
  RATES OF 1 TO 3 INCHES PER HOUR AND ISOLATED TOTALS OF 4 TO 6
  INCHES POSSIBLE BY 2 PM.

SPOTTERS AND SHERIFF OFFICE REPORTS HAVE INDICATED STREET FLOODING
ALREADY OCCURING IN THE CITIES OF BRAZORIA AND FRIENDSWOOD.
FRIENDSWOOD HAS REPORTED AS MUCH AS 3 INCHES OF RAIN OVER THE PAST
TWO HOURS.

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 ABANDONED QUICKLY.  MOVE
TO HIGHER GROUND.

NWS Houston/Galveston, TX wrote its last area forecast discussion before this flash flood warning went out at Oct 18, 9:50 AM CDT, 1 hour 34 minutes earlier.

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

Flash Flood Warnings in Texas, 1998Every flash flood warning in 1998

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.