Alert archive / Texas / Flash Flood Warnings in 2000

Flash Flood Warning 19, NWS Houston/Galveston, TX

September 13, 2000Brazoria County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Sep 13, 2000, 4:25 AM CDT for Brazoria 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: Sep 13, 2000, 4:25 AM CDT (09:25 UTC)
Expired: Sep 13, 2000, 7:00 AM CDT
In force: 3 hr
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 09:25 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

Lake Charles Mun, LA (KLCH), launched 00:00Z, 9.4 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 227 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 1207 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KHGX 130926
FFWHGX
TXC039-131200-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
425 AM CDT WED SEP 13 2000

THE NATIONAL WEATHER SERVICE IN HOUSTON/GALVESTON TX HAS ISSUED A

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

* UNTIL 700 AM CDT

* AT 420 AM CDT...DOPPLER RADAR CONTINUED TO INDICATE VERY HEAVY
  RAINFALL OVER CENTRAL AND SOUTHERN PORTIONS OF BRAZORIA COUNTY.
  DOPPLER RADAR ESTIMATES AND SURFACE OBSERVATIONS INDICATE THAT
  RAINFALL AMOUNTS OF BETWEEN 3 AND 8 INCHES HAVE FALLEN FROM JUST
  NORTH OF FREEPORT TO LAKE JACKSON TO NEAR ANGLETON. AN ADDITIONAL
  2 TO 4 INCHES IS POSSIBLE EARLY THIS MORNING AS THUNDERSTORMS
  CONTINUE TO MOVE NORTHWARD OFF OF THE GULF.

* FLOODING IS EXPECTED IN OR NEAR...
  ANGLETON...LAKE JACKSON...DANBURY

DO NOT CROSS ANY LOCATION WHERE WATER COVERS THE ROAD!

USE EXTRA CAUTION AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DEPTH
AND SPEED OF FLASH FLOOD WATERS.

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

LAT...LON 2943 9525 2915 9514 2887 9550 2921 9555
          2934 9538

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 Sep 13, 2:20 AM CDT, 2 hours 5 minutes earlier.

Area forecast discussion, Sep 13, 2:20 AM CDT, 2 hours 5 minutes before

SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
220 AM CDT WED SEP 13 2000

CONVECTION OCCURRING TONIGHT ALONG COASTAL SECTIONS OF SE TX WHERE
OUTFLOW BOUNDARY HAS COLLIDED WITH NORTHERN PORTION OF TROPICAL WAVE.
MODELS INDICATE THAT THIS WILL CONTINUE TONIGHT AND LIKELY BE
ONGOING FOR START OF 1ST PD.

MAIN ISSUES FOR THIS PACKAGE ARE CHC OF RAIN AND FRONT AT THE END OF
THE PD. FAVOR THE AVN MODEL PRECIP FIELD. WILL TAPER SLIGHTLY FROM S
TO N TODAY TO ACCOUNT FOR OUTFLOW BOUNDARY AND POSITION OF DEEP
TROPICAL MOISTURE (> 2 INCHES). SLIGHTLY LESS MOISTURE AVAILABLE FOR
NORTHERN SECTIONS OF FA. WITH REGION ON EAST SIDE OF UPPER LEVEL
SHEAR AXIS...DECENT DIVERGENCE ALOFT WILL CONTINUE OVER SE TX THRU
TODAY...WHICH SUPPORTS CONTINUED GOOD CHC OF RAIN. LOCALLY HEAVY
RAIN A GOOD BET...HOWEVER HARD TO PINPOINT WHO WILL GET IT DUE TO
THE MESO-SCALE INTERACTIONS. EASTERN EDGE OF MID-LEVEL RIDGE WILL
PROVIDE FOR MORE SUBSIDENCE ON THU SO WILL ONLY INCLUDE SLIGHT CHC
ON THU AND FRI.

AS PATN AMPLIFICATION OCCURS TOWARDS END OF THE PD...CF WILL PUSH
INTO SE TX ON FRIDAY AND LIKELY BRING COOLER TEMPS TO THE REGION
THIS WEEKEND. SE TX WILL LIE BETWEEN IMPRESSIVE RIDGE PARKED OVER
THE FOUR CORNERS AREA AND DEEP LOW JUST NORTH OF THE OHIO VALLEY.
AVN GUID INDICATING SIGNIFICANT COOLING FOR FRI HIGH TEMPS. BELIEVE
COOLING IS OVER-DONE DUE TO MID-LEVEL RIDGE AND DRIER AIRMASS IN
PLACE...SO WILL WAIT FOR SAT BEFORE LOWERING HIGH TEMPS.

THE TROPICAL WAVE IN THE CARIBBEAN HAS THE POTENTIAL FOR DEVELOPMENT
THIS WEEK AS IT TRACKS TO THE NW INTO THE GULF. CF EXPECTED TO BE IN
GULF BY LATE FRI WHICH WOULD HELP STEER ANY TROPICAL SYSTEM SOUTH OF
THE UPPER TX COAST. THEREFORE...FORECAST WILL NOT INCLUDE RAIN CHCS
FOR THE WEEKEND.

33/47

.KHGX...NONE

CLL TB 091/070 094/069 092 532
IAH TB 090/071 093/069 091 632
GLuS TB 088/079 088/077 089 632

In the hours before

Local storm report, Sep 12, 11:36 PM CDT, 4 hours 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1136 PM CDT TUE SEP 12 2000

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0700 PM    COLDSPRING                TX   WIND DAMAGE
09/12/00   SAN JACINTO                    TREES DOWN ALONG FM
                                          2025. REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

N

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 12, 7:12 PM CDT	Flash Flood Warning	HGX	San Jacinto	3 hr
Sep 13, 6:55 AM CDT	Flash Flood Warning	HGX	Brazoria	2 hr
Sep 13, 1:26 PM CDT	Flash Flood Warning	HGX	Galveston, Harris	3 hr
Sep 13, 4:15 PM CDT	Flash Flood Warning	HGX	Galveston	60 min
Sep 13, 4:32 PM CDT	Flash Flood Warning	HGX	Brazoria	3 hr

Nearby

Flash Flood Warnings in Texas, 2000 Every flash flood warning in 2000

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.