Alert archive / Texas / Flash Flood Warnings in 2001

Flash Flood Warning 19, NWS Houston/Galveston, TX

June 7, 2001Brazoria County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Jun 7, 2001, 12:25 PM CDT for Brazoria County, Texas. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Jun 7, 2001, 12:25 PM CDT (17:25 UTC)
Expired
Jun 7, 2001, 2:30 PM CDT
In force
2 hr
Issued by
NWS Houston/Galveston, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Brazoria County, TX

The radar

The Houston radar (KHGX), 64 km from the middle of the area, began a volume at 17:25 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, 5.4 hours before the alert went out and 230 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 2001-06-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2584 joules per kilogram.LCLLFCEL10008507005003002001001 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 2001-06-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -94 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
2584 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
612 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
-94 m²/s²
0-3 km storm-relative helicity
-42 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 
WGUS54 KHGX 071728
FFWHOU
TXC039-071930-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1225 PM CDT THU JUN 7 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN BRAZORIA COUNTY IN SOUTHEAST TEXAS

* UNTIL 230 PM CDT

* AT 1215 PM CDT...DOPPLER RADAR INDICATED VERY HEAVY RAINFALL.
  THUNDERSTORMS CONTINUED DEVELOP AND MOVE OVER SOUTHERN BRAZORIA    
  COUNTY. EXPECT ANOTHER 2 TO 3 INCHES OF RAIN BEFORE THE RAIN       
  BEGINS TO TAPER OFF BY MID-AFTERNOON. PLEASE USE EXTRA CAUTION IF  
  YOU LIVE NEAR OR ARE DRIVING NEAR THE SAN BERNARD OR BRAZOS        
  RIVERS.  

* FLOODING IS EXPECTED IN OR NEAR...
  BRAZORIA...SWEENY AND JONES CREEK

DO NOT CROSS ANY LOCATION WHERE WATER COVERS THE ROAD!

PLEASE REPORT FLOODING TO THE COUNTY SHERIFF...LOCAL POLICE...OR
DEPARTMENT OF PUBLIC SAFETY. THEY WILL RELAY YOUR REPORT TO THE
NATIONAL sWEATHER SERVICE.

LAT...LON 2900 9535 2889 9553 2919 9582 2924 9566

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 Jun 7, 9:58 AM CDT, 2 hours 27 minutes earlier.

Area forecast discussion, Jun 7, 9:58 AM CDT, 2 hours 27 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
958 AM CDT THU JUN 7 2001

AT THIS TIME THE CENTER OF CIRCULATION OF THE REMNANTS OF TROPICAL
DEPRESSION ALLISON WERE LOCATED OVER HOUSTON COUNTY AT THE SURFACE AND
MID LEVELS.  THE IR AND WATER VAPOR INDICATED THERE WAS LESS DRY AIR
ENTRAINED IN THE SYSTEM THAN EIGHT HOURS AGO...HOWEVER THE DRY SIDE OF
THE STORM WAS OVER THE SOUTHWESTERN COUNTIES.  FORECAST PROBLEM OF THE
DAY CONTINUES TO BE THE AMOUNT AND EXTENT OF RAINFALL.

RAINBANDS CURRENTLY AROUND THE LOW WERE BEGINNING TO MOVE IN A
SOUTHEASTERLY DIRECTION AS OPPOSED TO TRAINING IN A WEST TO EAST
MANNER FROM EARLIER THIS MORNING.  AM STILL CONCERNED THAT NEW BANDS
WILL FORM TO THE SOUTH OF THE MAIN AREA OF RAIN AROUND THE LOW AND
THAT THESE WILL TRAIN OVER COUNTIES IN THE CURRENT FLASH FLOOD WATCH
AREA.  ALTHOUGH AM STILL NOT VERY CONFIDENT WITH THE SPECIFICS OF THE
MODEL DATA...THE ETA CONTINUES TO SOUTHWARD TREND OF THE LOW...MOVING
IT PAST THE CLL AREA THIS AFTERNOON.  THIS SCENARIO SHOULD KEEP THE
EASTERN TWO THIRDS OF THE FORECAST AREA IN A CATEGORICAL POP
SITUATION.  THE DRY AIR ENTRAINING INTO THE SYSTEM JUST OFF THE TX
COAST MAY CAUSE A FEW STRONG STORMS OVER COASTAL COUNTIES...BUT THE
SEVERE THREAT IS ISOLATED AT BEST.

WILL CONTINUE THE FLASH FLOOD WATCH AND UPDATE THE FORECAST TO TAKE
OUT THE MORNING REFERENCES.  WILL ALSO CHANGE THE COASTAL ADVISORIES
SO THAT THE SCA IS OVER THE NORTHERN MARINE ZONES AND SCEC OVER THE
SOUTHERN ZONES.

PL-40
45

.KHGX...FFA EASTERN TWO THIRD COUNTIES.
        SCA GALVESTON BAY.
        SCA 00 TO 60 NM HIGH ISLAND TO FREEPORT.
        SCEC 00 TO 60 NM FREEPORT TO THE MATAGORDA SHIP CHANNEL.
        SCEC MATAGORDA BAY.

In the hours before

Special weather statement, Jun 7, 7:45 AM CDT, 4 hours 40 minutes before
TXZ163-164-176>179-198>200-210>214-226-227-237-238-071445-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
745 AM CDT THU JUN 7 2001

THE REMNANTS OF ALLISON STILL HAUNTING SOUTHEAST TEXAS

VERY HEAVY RAINFALL OVER NIGHT HAS LEAD TO FLASH FLOODING. RADAR
ESTIMATES OF 2 TO 5 INCHES WERE WIDESPREAD BETWEEN WESTERN FORT BEND
COUNTY ALONG THE HIGHWAY 59 CORRIDOR TO HOUSTON...WITH A CORRIDOR OF 6
TO 10 INCHES FROM RICHMOND TO MISSION BEND TO STAFFORD AND MISSOURI
CITY. IN LIBERTY COUNTY RADAR ESTIMATES OF 3 TO 12 INCHES IN THE
SOUTHEAST PORTIONS OF THE COUNTY. ANOTHER LARGE AREA OF RAIN OVER
NORTHWEST MADISON...HOUSTON...NORTHERN WALKER...AND WESTERN TRINITY
COUNTIES.

A SUMMARY OF RAINFALL REPORTS AS OF 730 AM FOLLOWS.
IN SUGARLAND             10.83 INCHES (NEAR ELDRIDGE AND HIGHWAY 90)
RATCLIFF                  7.10
SUGARLAND AIRPORT         7.85
PENNINGTON                6.65
ARBOR                     5.58
GRAPELAND                 5.30
WESTBURY                  5.00
CROCKETT                  4.97
HIRAM-CLARK AT SIMS BAYOU 4.53
EAST MISSOURI CITY        4.50
WECHES                    4.31
LOVELADY                  3.48
RICHMOND                  3.25
GESSNER AT BRAYS BAYOU    3.07

STAY TUNED TO NOAA WEATHER RADIO AND LOCAL MEDIA FOR THE LATEST
FORECASTS...UPDATES...AND WARNINGS.
Special weather statement, Jun 7, 10:05 AM CDT, 2 hours 20 minutes before
TXZ163-164-176>179-198>200-210>214-226-227-237-238-071630-

SPECIAL WEATHER STATEMENT...UPDATE
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1005 AM CDT THU JUN 7 2001

THE REMNANTS OF ALLISON STILL HAUNTING SOUTHEAST TEXAS!

VERY HEAVY RAINFALL OVER NIGHT HAS LEAD TO FLASH FLOODING. RADAR
ESTIMATES OF 2 TO 5 INCHES WERE WIDESPREAD BETWEEN WESTERN FORT BEND
COUNTY ALONG THE HIGHWAY 59 CORRIDOR TO HOUSTON...WITH A CORRIDOR OF
6 TO 12 INCHES FROM RICHMOND TO MISSION BEND TO STAFFORD AND MISSOURI
CITY. IN LIBERTY COUNTY RADAR ESTIMATES OF 3 TO 12 INCHES IN THE
SOUTHEAST PORTIONS OF THE COUNTY. ANOTHER LARGE AREA OF RAIN OVER
NORTHWEST MADISON...HOUSTON...NORTHERN WALKER...AND WESTERN TRINITY
COUNTIES.

A SUMMARY OF RAINFALL REPORTS AS OF 945 AM.
* TOTALS AS OF 730 AM
SUGARLAND                11.10 INCHES (NEAR ELDRIDGE AND HIGHWAY 90)
 BYPASS ON S.H.-6         9.57
 OYSTER CREEK AT S.H.-6   8.78
 DULLES AND AVE. E        7.44
RATCLIFF                  7.10 *
SUGARLAND AIRPORT         7.85 *
PENNINGTON                6.65 *
ARBOR                     5.58 *
GRAPELAND                 5.30 *
WESTBURY                  5.00 *
CROCKETT                  4.97 *
HIRAM-CLARK AT SIMS BAYOU 4.72
KEEGANS BAYOU AT ROARKE   4.29
WECHES                    4.31 *
LOVELADY                  3.48 *
RICHMOND                  3.25 *
GESSNER AT BRAYS BAYOU    3.15
HOUSTON HOBBY             0.68j
ANGLETON                  0.59
PEARLAND                  0.27

STAY TUNED TO NOAA WEATHER RADIO AND LOCAL MEDIA FOR THE LATEST
FORECASTS...UPDATES...AND WARNINGS.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 7, 1:38 AM CDTFlash Flood WarningHGXChambers, Liberty3 hr
Jun 7, 3:59 AM CDTFlash Flood WarningHGXHouston3 hr
Jun 7, 4:19 AM CDTFlash Flood WarningHGXLiberty4 hr
Jun 7, 5:14 AM CDTFlash Flood WarningHGXFort Bend, Harris3 hr
Jun 7, 7:10 AM CDTFlash Flood WarningHGXHouston, Trinity, Walker4 hr
Jun 7, 7:38 AM CDTFlash Flood WarningHGXFort Bend, Harris4 hr
Jun 7, 8:27 AM CDTFlash Flood WarningHGXBrazoria, Galveston3 hr
Jun 7, 11:00 AM CDTFlash Flood WarningHGXHouston, Trinity, Walker3 hr

Nearby

Flash Flood Warnings in Texas, 2001Every flash flood warning in 2001

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.