Alert archive / Texas / Flash Flood Warnings in 2007

Flash Flood Warning 21, NWS Houston/Galveston, TX

May 28, 2007Brazoria County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at May 28, 2007, 3:20 PM CDT for Brazoria County, Texas. It was in force for 115 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 28, 2007, 3:20 PM CDT (20:20 UTC)
Expired
May 28, 2007, 5:15 PM CDT
In force
115 min
Issued by
NWS Houston/Galveston, TX
Area
Whole counties

County Brazoria County, TX

The radar

The Houston radar (KHGX), 48 km from the middle of the area, began a volume at 20:21 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 8.3 hours before the alert went out and 240 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, Lake Charles Mun, LA at 12:00Z on 2007-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 541 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 12:00Z on 2007-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 116 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
541 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
628 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
116 m²/s²
0-3 km storm-relative helicity
91 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KHGX 282022
FFWHGX
TXC039-282215-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
320 PM CDT MON MAY 28 2007

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

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

* UNTIL 515 PM CDT

* AT 312 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS PRODUCING VERY HEAVY RAINFALL OVER CENTRAL 
  BRAZORIA COUNTY. THE THUNDERSTORMS ARE SHOWING LITTLE MOVEMENT
  WITH RADAR INDICATING RAINFALL RATES OF 2 INCHES PER HOUR IN THIS
  AREA.

* FLOODING IS EXPECTED IN OR NEAR...
ROSHARON...CHOCOLATE BAYOU...WILD PEACH VILLAGE...WEST COLUMBIA...
SWEENY...RICHWOOD...OYSTER CREEK...MANVEL...LIVERPOOL...LAKE 
JACKSON...JONES CREEK...IOWA COLONY...HOLIDAY LAKES...HILLCREST...
DANBURY...CLUTE...BRAZORIA...BONNEY...ANGLETON AND ALVIN.

LAW ENFORCEMENT IN BRAZORIA COUNTY REPORTED FLOODING ALONG STATE 
HIGHWAY 288 NEAR THE INTERSECTIONS OF FM HIGHWAY 523...AND COUNTY 
ROADS 340 AND 341. FLOODING WAS ALSO REPORTED ALONG STATE HIGHWAY 35 
NEAR WEST COLUMBIA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL MAY CAUSE FLOODING OF LAND
ADJACENT TO SMALL CREEKS AND BAYOUS. ADDITIONALLY...FRONTAGE ROADS...
HIGHWAY UNDERPASSES...FARM-TO-MARKET AND OTHER SECONDARY ROADS MAY
FLOOD. AVOID LOCATIONS WHERE WATER COVERS THE GROUND

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

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

LAT...LON 2912 9579 2885 9558 2912 9507 2955 9528
      2952 9540

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 28, 6:30 AM CDTFlash Flood WarningHGXJackson60 min
May 28, 12:31 PM CDTMarine Weather StatementHGX7 hr
May 28, 12:33 PM CDTFlash Flood WarningHGXBrazoria, Harris3 hr
May 28, 3:01 PM CDTFlash Flood WarningHGXColorado119 min
May 28, 5:12 PM CDTFlash Flood WarningHGXBrazoria2 hr

Nearby

Flash Flood Warnings in Texas, 2007Every flash flood warning in 2007

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.