Alert archive / Texas / Flash Flood Warnings in 2001

Flash Flood Warning 25, NWS Houston/Galveston, TX

June 8, 2001Liberty County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Jun 8, 2001, 1:49 AM CDT for Liberty County, Texas. It was in force for 4 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 8, 2001, 1:49 AM CDT (06:49 UTC)
Expired
Jun 8, 2001, 5:45 AM CDT
In force
4 hr
Issued by
NWS Houston/Galveston, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Liberty County, TX

The radar

The Houston radar (KHGX), 81 km from the middle of the area, began a volume at 06:51 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, 6.8 hours before the alert went out and 128 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 00:00Z on 2001-06-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1189 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 00:00Z on 2001-06-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 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
1189 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
887 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
87 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.6

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KHGX 080648
FFWHOU
TXC291-081045-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
149 AM CDT FRI JUN 8 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 545 AM CDT

* AT 136 AM CDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS 
  PRODUCING VERY HEAVY RAINFALL OF 2 TO 4 INCHES PER HOUR MOVING 
  ACROSS SOUTHEASTERN LIBERTY COUNTY.

* FLOODING IS EXPECTED IN OR NEAR...
  DAISETTA...DEVERS

LAW ENFORCEMENT REPORTED THAT HIGHWAY 90 WAS ALREADY CLOSED DUE TO 
FLOODING FROM EARLIER HEAVY RAINFALL ACROSS THE SOUTHEASTERN PORTION 
OF LIBERTY COUNTY.  THE THUNDERSTORM PRODUCING THE CURRENT RAINFALL 
IS EXPECTED TO CONTINUE ACROSS THE SOUTHEASTERN PORTION OF THE 
COUNTY THROUGH 230 AM...PRODUCING AN ADDITIONAL 1 TO 3 INCHES OF 
RAINFALL.

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 WEATHER SERVICE.

LAT...LON 3012 9446 2996 9445 2989 9445 2989 9467
          3012 9465

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, 8:15 PM CDT, 5 hours 34 minutes earlier.

Area forecast discussion, Jun 7, 8:15 PM CDT, 5 hours 34 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION...REMOVED CAUTION FOR BAYS
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
815 PM CDT THU JUN 7 2001

ONLY MINOR CHANGES IN 9 PM UPDATE...

THE PERSISTENT MID LEVEL REMAINS OF T.D. ALLISON WILL CONTINUE  TO
BE THE MAIN PLAYER IN THE LOCAL FORECAST AREA INTO THE WEEKEND.
MOST RECENT CONSENSUS BASED MAINLY ON RADAR, SATELLITE & RUC - IS
THAT THE 700 MB CIRCULATION IS BEGINNING TO BECOME DISTENDED WITH A
NE-SW AXIS.  IF THIS IS SO, AND THE LATEST RUC AND ETA FORECASTS PAN
OUT, THIS MAY RESULT IN REDEVELOPMENT OR INTENSIFICATION OF
PRECIPITATION ON THE SOUTHEAST SIDE OF THIS 700MB CYCLONE AXIS,
MEANING (FOR TONIGHT) MAINLY IN A CORRIDOR FROM THE MATAGORDA BAY
AREA TO SOUTHERN LIBERTY COUNTY, INCLUDING METRO HOUSTON.  AND AS
HAS BEEN WELL COVERED IN THE NEWS, MUCH OF THE HOUSTON AREA HAS BEEN
THOROUGHLY DRENCHED DURING THE LAST TWO DAYS ALREADY.

HOWEVER, THIS DOESNT CALL FOR MUCH IF ANY CHANGE TO CURRENT
FORECAST, SINCE ENTIRE CWA IS UNDER A FLASH FLOOD WATCH - IT JUST
MEANS WE MAY GET INTO A FLASH FLOOD WARNING SITUATION A LITTLE
EARLIER THAN ANTICIPATED, POSSIBLY BETWEEN 9 PM & MIDNIGHT.

AND AS FAR AS THE FLASH FLOOD WATCH GOES, SINCE LARGE AREAS OF LIGHT
TO MODERATE CONTINUE TO ORBIT ABOUT THE 700MB CIRCULATION,
IMPOSSIBLE TO RULE OUT ANY AREA IN THE CWA AS NOT AT RISK, ALTHOUGH
THE STRIP OF COUNTIES ON THE FAR WESTERN EDGE OF THE FORECAST AREA
HAVE YET TO REALLY RECEIVE COPIOUS RAINS FROM THIS SYSTEM.  HOWEVER,
THE CURRENT TREND OF THE MID LEVEL CIRCULATION TO SLIP GRADUALLY TO
THE SOUTHWEST MAY BRING THEM INTO THE ACT YET.

ELSE, NOT MUCH CHANGED IN THE 18Z RUNS REGARDING THE
QUASI-STATIONARY NATURE OF THE REMAINS OF THE T.D. AND IN PARTICULAR
THE MID & UPPER LEVEL CIRCULATIONS, WHICH MAY PRESENT A PRECIP
PROBLEM INTO NEXT WEEK.

38/36/30/48

.KHGX...FLASH FLOOD WATCH ALL OF SOUTHEAST TEXAS THROUGH
        TONIGHT.
        SCEC 0-60 NM WATERS.

PRELIMS...
CLL TT 072/082 072/082 072 877
IAH TT 073/082 073/082 072 877
GLS TT 075/084 075/084 075 877

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 7, 8:02 PM CDTFlash Flood WarningHGXLiberty3 hr
Jun 7, 8:45 PM CDTFlash Flood WarningHGXHouston3 hr
Jun 7, 10:44 PM CDTFlash Flood WarningHGXWalker3 hr
Jun 7, 11:21 PM CDTFlash Flood WarningHGXHouston3 hr
Jun 7, 11:48 PM CDTFlash Flood WarningHGXLiberty3 hr
Jun 8, 1:37 AM CDTSevere Thunderstorm WarningHGXChambers38 min
Jun 8, 2:50 AM CDTFlash Flood WarningHGXHouston, Trinity, Walker6 hr
Jun 8, 3:57 AM CDTSevere Thunderstorm WarningHGXGalveston, Harris63 min
Jun 8, 4:25 AM CDTFlash Flood WarningHGXBrazoria, Chambers, Galveston, Liberty3 hr
Jun 8, 6:41 AM CDTFlash Flood WarningHGXPolk2 hr
Jun 8, 7:15 AM CDTFlash Flood WarningHGXBrazoria3 hr
Jun 8, 7:23 AM CDTFlash Flood WarningHGXLiberty3 hr
Jun 8, 3:48 PM CDTFlash Flood WarningHGXMontgomery, Walker3 hr
Jun 8, 5:10 PM CDTFlash Flood WarningHGXHarris3 hr
Jun 8, 5:30 PM CDTFlash Flood WarningHGXBrazoria, Fort Bend3 hr
Jun 8, 5:46 PM CDTTornado WarningHGXMontgomery44 min
Jun 8, 6:40 PM CDTFlash Flood WarningHGXWashington3 hr
Jun 8, 6:52 PM CDTFlash Flood WarningHGXMontgomery, 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.