Alert archive / Texas / Flash Flood Warnings in 2001

Flash Flood Warning 62, NWS Houston/Galveston, TX

August 28, 2001Galveston County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Aug 28, 2001, 1:43 PM CDT for Galveston 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 28, 2001, 1:43 PM CDT (18:43 UTC)
Expired
Aug 28, 2001, 4:45 PM CDT
In force
3 hr
Issued by
NWS Houston/Galveston, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Galveston County, TX

The radar

The Houston radar (KHGX), 14 km from the middle of the area, began a volume at 18:47 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, 6.7 hours before the alert went out and 183 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 2001-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 900 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 2001-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 30 square meters per square second.1939Sfc1 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
900 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
737 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
30 m²/s²
0-3 km storm-relative helicity
46 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KHGX 281846
FFWHOU
TXC167-282145-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
143 PM CDT TUE AUG 28 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 445 PM CDT

* AT 136 PM CDT...DOPPLER RADAR INDICATED VERY HEAVY RAINFALL OVER 
GALVESTON COUNTY. NUMEROUS THUNDERSTORMS OVER GALVESTON COUNTY WILL 
PERSIST THE NEXT FEW HOURS ESPECIALLY FROM LEAGUE CITY TO GALVESTON 
ISLAND.

* FLOODING IS EXPECTED IN OR NEAR...
  BACLIFF...BAYOU VISTA...DICKINSON...HITCHCOCK...GALVESTON ISLAND.

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 2956 9492 2948 9457 2916 9504 2949 9521

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 28, 9:35 AM CDT, 4 hours 8 minutes earlier.

Area forecast discussion, Aug 28, 9:35 AM CDT, 4 hours 8 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
935 AM CDT TUE AUG 28 2001

SATELLITE LOOPS INDICATE WEAK BUT LARGE MCS PROPAGATING NORTHWARD
TOWARDS CWFA AND NOW APPROACHING SW ZONES. FIRST LOOK AT 12Z
SURROUNDING SOUNDINGS SHOWS LITTLE CHANGE IN PROFILE W/ABOUT 2
INCHES PWATS OVER REGION. SFC ANALYSIS SHOWS FLAT PRES GRADIENT
W/CONFLUENT FLOW AT COASTAL REGION. GOOD SPEED CONVERGENCE AT 850 MB
JUST SW OF REGION W/WEAK RR QUAD OF UPPER JET TO N. ANOTHER WET DAY.
PREVIOUS FCST PACKAGE ON TRACK FOR THE MOST PART. HOWEVER...WILL UP
POPS SOUTHERN ZONES TO REFLECT CURRENT TRENDS AND MAKE MINOR
ADJUSTMENTS TO 1ST PD TEMPS.

37/45/BT

.HGX...NONE.

CLL TT 089/072 087/072 087 748
IAH TT 087/072 086/072 087 848
GLS TT 086/076 084/076 086 958

In the hours before

Local storm report, Aug 28, 12:23 PM CDT, 1 hour 20 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1223 PM CDT TUE AUG 28 2001

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

1150 AM    6 E NEEDVILLE             TX   WIND DAMAGE
08/28/01   FORT BEND                      REPORTED BY EMERGENCY
                                          MANAGEMENT.
Local storm report, Aug 28, 12:30 PM CDT, 1 hour 13 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1230 PM CDT TUE AUG 28 2001

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

0230 PM    10 NNE SHEPHERD           TX   60 MPH TSTM GUST
08/26/01   SAN JACINTO                    REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

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.