Alert archive / Texas / Flash Flood Warnings in 2001

Flash Flood Warning 69, NWS Houston/Galveston, TX

August 31, 2001Jackson County, Matagorda County, Wharton County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Aug 31, 2001, 11:27 AM CDT for Jackson County, Matagorda County, Wharton 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 outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Aug 31, 2001, 11:27 AM CDT (16:27 UTC)
Expired
Aug 31, 2001, 2:30 PM CDT
In force
3 hr
Issued by
NWS Houston/Galveston, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Jackson County, TX, Matagorda County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 122 km from the middle of the area, began a volume at 16:27 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, 4.5 hours before the alert went out and 317 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 2001-08-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1777 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, Lake Charles Mun, LA at 12:00Z on 2001-08-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 156 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
1777 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
515 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
156 m²/s²
0-3 km storm-relative helicity
196 m²/s²
Significant tornado parameter
1.4
Supercell composite
9.7

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KHGX 311628
FFWHOU
TXC239-321-481-311930-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON-GALVESTON TX
1127 AM CDT FRI AUG 31 2001

THE NATIONAL WEATHER SERVICE HAS RE-ISSUED A

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

* UNTIL 230 PM CDT

* AT 1130 AM CDT...DOPPLER RADAR SHOWED POCKETS OF MODERATE TO  
  HEAVY RAINFALL OVER THE WARNING AREA. RAINFALL RATES WILL BE       
  NEAR 2 INCHES AN HOUR IN THE HEAVIEST ACTIVITY. THIS               
  ADDITIONAL RAIN WILL AGGRAVATE ONGOING FLOODING OVER THE           
  COUNTIES.         
 
* PORTIONS OF THE FOLLOWING ROADWAYS WERE REPORTED CLOSED AT THIS
  TIME. IN JACKSON COUNTY...COUNTY ROADS 283...125...112 AND 127.
  IN WHARTON COUNTY...FM 1301 AT THE MATAGORDA COUNTY LINE...
  COUNTY ROAD 215 AT WEST BERNARD CREEK...AND 164 AT TEAGUE. MANY
  OTHER ROADS HAD HIGH WATER ON THEM...BUT WERE STILL PASSABLE. 
  ADDITIONAL ROAD CLOSURES ARE POSSIBLE DUE TO HEAVY RAIN.

DO NOT DRIVE INTO FLOODED ROADWAYS OR INTO FLOOD WATERS. THE DEPTH 
MAY BE TOO GREAT FOR YOU TO CROSS SAFELY.

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 2951 9613 2875 9564 2855 9653 2908 9684

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 31, 9:45 AM CDT, 1 hour 42 minutes earlier.

Area forecast discussion, Aug 31, 9:45 AM CDT, 1 hour 42 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
945 AM CDT FRI AUG 31 2001

MCS OVER SW THIRD OF CWFA THIS MORNING PRODUCING ISOLATED 2 INCH
PER HOUR RATES OVER WHARTON AND EXTREME SW FORT BEND COUNTIES.
SATELLITE IR LOOP INDICATE CLOUD TOP WARMING BY NEARLY 10 DEG C LAST
2 HOURS FROM THIS CLUSTER AND HOPEFULLY THIS TREND WILL CONTINUE.
HOWEVER...ANALYZED MORNING DATA SHOWS VERY HIGH PWATS (NEAR 2.5
INCHES AT KLCH) OVER REGION...DIFLUENCE AT UPPER LEVELS AND 30 KT
LLJET. WILL NOT CHANGE PREVIOUS PACKAGE SINCE IT IS ON TRACK.

37/46/48

.HGX...FFA ALL CWA TODAY.
       SCA 20 TO 60 NM HIGH ISLAND TO THE MATAGORDA SHIP CHANNEL.

CLL...080/073 083/073 088 987
IAH...079/074 080/074 086 +87
GLS...083/079 083/079 086 +87

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 30, 10:55 PM CDTFlash Flood WarningHGXJackson, Wharton6 hr
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, 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.