Alert archive / Texas / Flash Flood Warnings in 2001

Flash Flood Warning 64, NWS Houston/Galveston, TX

August 30, 2001Jackson County, Wharton County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Aug 30, 2001, 10:55 PM CDT for Jackson County, Wharton County, Texas. It was in force for 6 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
Aug 30, 2001, 10:55 PM CDT (03:55 UTC)
Expired
Aug 31, 2001, 4:45 AM CDT
In force
6 hr
Issued by
NWS Houston/Galveston, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Jackson County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 127 km from the middle of the area, began a volume at 03:56 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 00:00Z, 3.9 hours before the alert went out and 198 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 00:00Z on 2001-08-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3264 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 00:00Z on 2001-08-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 77 square meters per square second.193958Sfc1 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
3264 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
567 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
77 m²/s²
0-3 km storm-relative helicity
80 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 310353
FFWHOU
TXC239-481-310945-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1055 PM CDT THU AUG 30 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  JACKSON COUNTY IN SOUTHEAST TEXAS
  WHARTON COUNTY IN SOUTHEAST TEXAS

* UNTIL 445 AM CDT

* AT 950 PM CDT...DOPPLER RADAR CONTINUED TO SHOW VERY HEAVY RAINFALL
  OVER JACKSON AND WHARTON COUNTIES. RADAR ESTIMATES 5 TO 6 INCHES
  HAVE ALREADY FALLEN IN THE NORTHWEST PORTION OF JACKSON COUNTY...
  AND IN THE EXTREME EASTERN AND WESTERN PORTIONS OF WHARTON COUNTY.

* FLOODING IS EXPECTED IN OR NEAR...
  MORALES...CORDELE...LOUISE...EL CAMPO...RURAL LOCATIONS EAST
  OF WHARTON.

SMALL CREEKS...STREAMS...BAYOUS..AND FARM-TO-MARKET OR OTHER 
SECONDARY ROADS MAY FLOOD QUICKLY. 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 2963 9617 2926 9591 2879 9665 2909 9694
          2936 9642

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 Aug 30, 8:52 PM CDT, 2 hours 3 minutes earlier.

Area forecast discussion, Aug 30, 8:52 PM CDT, 2 hours 3 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
852 PM CDT THU AUG 30 2001

FORECAST PROBLEM OF THE NIGHT CONTINUES TO BE EXTENT AND AMOUNT OF
RAINFALL.  00Z SURFACE ANALYSIS SHOWED A SURFACE TROUGH ALONG AND
JUST OFFSHORE OF THE UPPER TEXAS COAST.  00Z SOUNDINGS SHOW PW/S 2.1
TO 2.5 INCHES...850 MB DEWPOINTS OF 16 TO 18 CELSIUS...AND 700 MB
DEWPOINTS OF 4 TO 7 CELSIUS.  WATER VAPOR INDICATED A SHORTWAVE
TROUGH MOVING IN FROM THE WEST WHILE THE UPPER CHARTS AT 00Z SHOWED
GOOD DIFFLUENCE OVER THE AREA.  IR AND RADAR SHOWED THAT
REDEVELOPMENT WAS OCCURRING RIGHT OVER SE TX.  THE 00Z SOUNDINGS ALSO
INDICATE A SEVERE WEATHER THREAT.  WILL MENTION A CHANCE OF SEVERE
STORMS IN THE COASTAL COUNTIES WHERE THE GREATEST THREAT APPEARS TO
BE.

THE RAINFALL SHOULD CONTINUE AND WILL KEEP THE FLASH FLOOD WATCH IN
EFFECT FOR TONIGHT AND EXTEND IT INTO FRIDAY.  THE THINKING HERE IS
THAT THE GREATEST THREAT WILL BE ACROSS THE SOUTHERN THIRD.

PL-40
31

.HGX...FFA ALL CWA TONIGHT AND FRIDAY.
       SCEC 00 TO 20 NM HIGH ISLAND TO THE MATAGORDA SHIP CHANNEL.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 30, 7:05 PM CDTTornado WarningHGXLiberty25 min
Aug 30, 7:32 PM CDTTornado WarningHGXChambers, Galveston43 min
Aug 30, 7:49 PM CDTTornado WarningHGXBrazoria, Galveston41 min
Aug 30, 8:20 PM CDTFlash Flood WarningHGXBrazoria, Fort Bend, Galveston, Harris6 hr
Aug 30, 8:25 PM CDTTornado WarningHGXChambers35 min
Aug 30, 8:45 PM CDTTornado WarningHGXBrazoria45 min
Aug 30, 9:07 PM CDTTornado WarningHGXChambers38 min
Aug 30, 9:35 PM CDTTornado WarningHGXChambers40 min
Aug 31, 1:05 AM CDTFlash Flood WarningHGXBrazoria, Fort Bend, Galveston, Harris6 hr
Aug 31, 3:45 AM CDTFlash Flood WarningHGXJackson, Wharton6 hr
Aug 31, 8:30 AM CDTFlash Flood WarningHGXColorado, Jackson, Matagorda, Wharton3 hr
Aug 31, 9:55 AM CDTFlash Flood WarningHGXBrazoria, Fort Bend3 hr
Aug 31, 11:27 AM CDTFlash Flood WarningHGXJackson, Matagorda, Wharton3 hr
Aug 31, 1:00 PM CDTFlash Flood WarningHGXBrazoria, Fort Bend3 hr
Aug 31, 1:52 PM CDTTornado WarningHGXChambers23 min
Aug 31, 2:28 PM CDTFlash Flood WarningHGXJackson, Wharton92 min
Aug 31, 3:55 PM CDTFlash Flood WarningHGXBrazoria, Fort Bend, Jackson, Wharton2 hr
Aug 31, 5:58 PM CDTFlash Flood WarningHGXBrazoria, Fort Bend, Jackson, Wharton3 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.