Alert archive / Texas / Flash Flood Warnings in 2001

Flash Flood Warning 6, NWS Houston/Galveston, TX

June 5, 2001Brazoria County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Jun 5, 2001, 5:57 PM 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 outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Jun 5, 2001, 5:57 PM CDT (22:57 UTC)
Expired
Jun 5, 2001, 9:00 PM CDT
In force
3 hr
Issued by
NWS Houston/Galveston, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Brazoria County, TX

The radar

The Houston radar (KHGX), 27 km from the middle of the area, began a volume at 22:59 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, 11.0 hours before the alert went out and 219 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 2001-06-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1639 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 2001-06-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -26 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
1639 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
686 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
-26 m²/s²
0-3 km storm-relative helicity
-34 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 052259
FFWHOU
TXC039-060200-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
557 PM CDT TUE JUN 5 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 900 PM CDT

* AT 554 PM CDT...DOPPLER RADAR INDICATED VERY HEAVY RAINFALL.
RAINFALL RATES OF 3 TO 4 INCHES PER HOUR CAN BE EXPECTED. FLOODING 
OF LOW LYING AREAS IS LIKELY.
 
* FLOODING IS EXPECTED IN OR NEAR...
  MANVEL...ALVIN AND PEARLAND

DO NOT CROSS ANY LOCATION WHERE WATER COVERS THE ROAD!

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

LAT...LON 2948 9544 2945 9525 2955 9525 2957 9541

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 5, 2:45 PM CDT, 3 hours 12 minutes earlier.

Area forecast discussion, Jun 5, 2:45 PM CDT, 3 hours 12 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
245 PM CDT TUE JUN 5 2001

THE TROPICAL SEASON IS UNDERWAY...AND WE HAVE THE MISFORTUNE OF
HAVING TO DEAL WITH THE FIRST ONE...ALLISON. HPC GUIDANCE TAKES THE
SYSTEM INLAND ACRS OUR SE COAST THIS EVENING. MAX WINDS AT PRESENT
50G60KT. QPF AMTS 5 INCHES PLUS AHD OF STORM. WON'T GO ON FOR PAGES
DISCUSSING PARTICULARS...SEE LATEST HPC GUIDANCE AND OUR HLS'S.

BEHIND ALLISON...AIRMASS REMAINS VERY MOIST. A LTL HEATING ON AN
ATMOSPHERE WITH PW VALUES AOA 2" SHD LEAD TO MORE CONVECTION TMRW
INTO TMRW NGT. WILL BE USING HIGH POPS RANGING FROM 50 NW TO CAT SE.
MOISTURE REMAINS NEARLY AS HIGH INTO THU. ETA SHOWS SOME IMPRESSIVE
UVV VALUES SRN ZONES. SO ANOTHER ROUND OF TSTMS LOOKS QUITE POSSIBLE
THU.

EFP LEFT UNCHANGED. MRF SHOWS LOWER MOISTURE LVLS BUT STILL ENOUGH
FOR ISOLD CONVECTION EACH DAY. RDG A LTL TOO FAR WEST FOR HIGH
CONFIDENCE THAT CAP WILL KEEP US COMPLETELY DRY EACH DAY.

.KHGX...FLASH FLOOD WATCH THRU WED ALONG AND E OF A LINE FROM
        NORMANGEE TO SWEENY.

        TROPICAL STORM WARNING SARGENT EWD.

        HIGH WIND WARNING MONTGOMERY...POLK...SAN JACINTO CO
        TNGT.

PRELIMS...
CLL TT 071/085 071/085 071 566
IAH TT 073/085 073/085 073 887
GLS TT 075/083 075/083 076 887

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 5, 4:38 PM CDTFlash Flood WarningHGXGalveston, Harris3 hr
Jun 5, 5:32 PM CDTTornado WarningHGXBrazoria, Fort Bend28 min
Jun 5, 6:15 PM CDTTornado WarningHGXBrazoria, Fort Bend30 min

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.