Alert archive / Texas / Flash Flood Warnings in 2001
Flash Flood Warning 68, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this flash flood warning at Aug 31, 2001, 9:55 AM CDT for Brazoria County, Fort Bend 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, 9:55 AM CDT (14:55 UTC)
- Expired
- Aug 31, 2001, 1:00 PM CDT
- In force
- 3 hr
- Issued by
- NWS Houston/Galveston, TX
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Brazoria County, TX, Fort Bend County, TX
The radar
The Houston radar (KHGX), 59 km from the middle of the area, began a volume at 14:57 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, 2.9 hours before the alert went out and 250 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.
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS54 KHGX 311459 FFWHOU TXC039-157-311800- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 955 AM CDT FRI AUG 31 2001 THE NATIONAL WEATHER SERVICE HAS ISSUED A * FLASH FLOOD WARNING FOR... BRAZORIA COUNTY IN SOUTHEAST TEXAS FORT BEND COUNTY IN SOUTHEAST TEXAS * UNTIL 100 PM CDT * AT 948 AM CDT...DOPPLER RADAR INDICATED VERY HEAVY RAINFALL EXTENDING FROM NEAR MISSION BEND TO IOWA COLONY TO DAMON AND TO THOMPSONS. RAINFALL RATES WERE ESTIMATED AT ONE TO TWO INCHES PER HOUR. MOVEMENT OF THE THUNDERSTORMS WAS NORTHEAST AT 20 MPH * FLOODING IS EXPECTED IN OR NEAR... FIRST COLONY...FRESNO...HOLIDAY LAKES...MANVEL...ROSENBERG ...NEEDVILLE...MISSOURI CITY...ROSHARON AND WEST COLUMBIA 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 2974 9576 2938 9518 2907 9570 2954 9604
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, 10 minutes earlier.
Area forecast discussion, Aug 31, 9:45 AM CDT, 10 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 +87The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 7:05 PM CDT | Tornado Warning | HGX | Liberty | 25 min |
| Aug 30, 7:32 PM CDT | Tornado Warning | HGX | Chambers, Galveston | 43 min |
| Aug 30, 7:49 PM CDT | Tornado Warning | HGX | Brazoria, Galveston | 41 min |
| Aug 30, 8:20 PM CDT | Flash Flood Warning | HGX | Brazoria, Fort Bend, Galveston, Harris | 6 hr |
| Aug 30, 8:25 PM CDT | Tornado Warning | HGX | Chambers | 35 min |
| Aug 30, 8:45 PM CDT | Tornado Warning | HGX | Brazoria | 45 min |
| Aug 30, 9:07 PM CDT | Tornado Warning | HGX | Chambers | 38 min |
| Aug 30, 9:35 PM CDT | Tornado Warning | HGX | Chambers | 40 min |
| Aug 30, 10:55 PM CDT | Flash Flood Warning | HGX | Jackson, Wharton | 6 hr |
| Aug 31, 1:05 AM CDT | Flash Flood Warning | HGX | Brazoria, Fort Bend, Galveston, Harris | 6 hr |
| Aug 31, 3:45 AM CDT | Flash Flood Warning | HGX | Jackson, Wharton | 6 hr |
| Aug 31, 8:30 AM CDT | Flash Flood Warning | HGX | Colorado, Jackson, Matagorda, Wharton | 3 hr |
| Aug 31, 11:27 AM CDT | Flash Flood Warning | HGX | Jackson, Matagorda, Wharton | 3 hr |
| Aug 31, 1:00 PM CDT | Flash Flood Warning | HGX | Brazoria, Fort Bend | 3 hr |
| Aug 31, 1:52 PM CDT | Tornado Warning | HGX | Chambers | 23 min |
| Aug 31, 2:28 PM CDT | Flash Flood Warning | HGX | Jackson, Wharton | 92 min |
| Aug 31, 3:55 PM CDT | Flash Flood Warning | HGX | Brazoria, Fort Bend, Jackson, Wharton | 2 hr |
| Aug 31, 5:58 PM CDT | Flash Flood Warning | HGX | Brazoria, Fort Bend, Jackson, Wharton | 3 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.