Alert archive / Texas / Flash Flood Warnings in 2001
Flash Flood Warning 88, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this flash flood warning at Nov 27, 2001, 6:30 AM CST for Liberty 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
- Nov 27, 2001, 6:30 AM CST (12:30 UTC)
- Expired
- Nov 27, 2001, 9:00 AM CST
- In force
- 3 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), 75 km from the middle of the area, began a volume at 12:33 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, 0.5 hours before the alert went out and 140 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
- 1752 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 477 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 202 m²/s²
- 0-3 km storm-relative helicity
- 213 m²/s²
- Significant tornado parameter
- 1.7
- Supercell composite
- 9.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS54 KHGX 271229 FFWHOU TXC291-271500- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 630 AM CST TUE NOV 27 2001 THE NATIONAL WEATHER SERVICE HAS ISSUED A * FLASH FLOOD WARNING FOR... LIBERTY COUNTY IN SOUTHEAST TEXAS * UNTIL 900 AM CST * AT 623 AM CST...DOPPLER RADAR INDICATED VERY HEAVY RAINFALL OVER SOUTHERN LIBERTY COUNTY. * FLOODING IS EXPECTED IN OR NEAR... LIBERTY...DAYTON...DAISETTA...AMES 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 3011 9450 2990 9443 2990 9497 3015 9486
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 Nov 27, 3:34 AM CST, 2 hours 56 minutes earlier.
Area forecast discussion, Nov 27, 3:34 AM CST, 2 hours 56 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
334 AM CST TUE NOV 27 2001
CORRECTED TEXT.
VERY ACTIVE JET AFFECTING SE TX OVER THE NEXT COUPLE OF DAYS AS A
STRONG TROUGH AT 500 MB MOVES ACROSS THE REGION. COLD FRONT MOVING
INTO SE TX EARLY THIS MORNING LOOKS TO HANG UP ALONG THE COAST OR
INLAND TODAY...THEN MOVE SLOWLY OFF THE COAST WEDNESDAY BEFORE THE
STRONG UPPER TROUGH MOVES OVER THE AREA. GOOD ISENTROPIC LIFT WILL
COUPLE WITH THE HIGH MOISTURE...PLUS ELEVATED CONVECTION WILL MEAN
HIGH RAINFALL POTENTIAL AND CHANCE FOR SEVERE THE FIRST THREE PERIODS.
FORECAST ISSUES RUN THE GAMUT FROM SEVERE AND FLASH FLOOD CONCERNS
TODAY...TONIGHT...INTO WEDNESDAY TO WINTRY PRECIP POSSIBILITIES LATE
WEDNESDAY IN THE WEST AND NORTH. LIKED THE ETA OVER THE AVN AS THE
ETA DID BETTER WITH THE SURFACE FEATURES AND THE AVN LOOKS TO PULL THE
500 MB LOW AND TROUGH OUT TOO QUICKLY WEDNESDAY AND THURSDAY.
FOR TODAY AND TONIGHT WILL ISSUE A FLASH FLOOD WATCH FOR BASICALLY THE
EASTERN TWO THIRDS OF THE FORECAST AREA. THE ETA MODEL SOUNDINGS ALSO
SHOWED THE POTENTIAL FOR ELEVATED CONVECTION WITH HAIL AND WIND THE
MAIN SEVERE THREATS...BUT SOME SHEAR IS ALSO PRESENT.
FOR WEDNESDAY INTO EARLY THURSDAY A TRANSITION TO A COLDER AIRMASS
WILL OCCUR AS THE PRECIP ENDS. THIS WILL MEAN THAT AREAS OVER THE
WEST AND NORTH MAY SEE A TRANSITION TO WINTRY PRECIPITATION AS WELL.
GIVEN THE MORE PRESSING ISSUES IN THE FIRST THREE PERIODS AND THE FACT
THAT ETA MAY BE TOO STRONG IN ITS SUGGESTION OF THE PRECIPITATION
CONTINUING IN THE COLD AIRMASS...WILL PUNT TO THE NEXT SHIFT FOR ANY
MAJOR ITEMS. WILL MENTION THE POSSIBILITY OF RAIN MIXING WITH SNOW
BEFORE ENDING.
TEMPERATURES MAY VARY WIDELY ALONG THE COASTAL COUNTIES AND THOSE
FARTHER INLAND GIVEN THE MOVEMENT AND PLACEMENT OF THE FRONT. WENT
TOWARD THE COLDER MAV FOR INLAND STATIONS TEMPERED BY THE ETA SOUNDING
DATA AND WENT CLOSER TO THE FWC FOR THE COAST.
.HGX...SCEC GULF WATERS OUT 20-60 NM.
TORNADO WATCH THROUGH 11Z FOR EASTERN PORTIONS OF CWA.
FLASH FLOOD WATCH TODAY AND TONIGHT EASTERN TWO THIRDS OF CWA.
PL-40
34
PRELIMS...
CLL TR 060/040 043/031 049 899
IAH TR 073/047 049/036 050 889
GLS TR 074/063 067/044 053 689The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 26, 6:06 PM CST | Tornado Warning | HGX | Liberty | 39 min |
| Nov 26, 10:50 PM CST | Tornado Warning | HGX | Montgomery | 55 min |
| Nov 26, 11:10 PM CST | Tornado Warning | HGX | Austin, Waller | 65 min |
| Nov 27, 1:10 AM CST | Flash Flood Warning | HGX | Montgomery, Polk, San Jacinto | 3 hr |
| Nov 27, 4:13 AM CST | Flash Flood Warning | HGX | Montgomery, San Jacinto | 2 hr |
| Nov 27, 2:48 PM CST | Special Marine Warning | HGX | 117 min | |
| Nov 27, 4:43 PM CST | Special Marine Warning | HGX | 2 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.