Alert archive / Texas / Tornado Warnings in 2001

Tornado Warning 27, NWS Houston/Galveston, TX

October 12, 2001Liberty County, Texas

NWS Houston/Galveston, TX issued this tornado warning at Oct 12, 2001, 4:45 PM CDT for Liberty County, Texas. It was in force for 45 min. 1 report came from 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, with what was reported inside it.

The facts

Issued
Oct 12, 2001, 4:45 PM CDT (21:45 UTC)
Expired
Oct 12, 2001, 5:30 PM CDT
In force
45 min
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), 70 km from the middle of the area, began a volume at 21:45 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.

What was reported inside it

TimeReportWhereRemark
Oct 12, 4:52 PM CDTTornado F0Dayton, TXSheriff's office reported a tornado touched down near FM 686 and FM 321 and moved east toward Highway 90. Damage to a business and the roof of a trailer was reported, as well as trees and power lines down.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 9.8 hours before the alert went out and 166 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 2001-10-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 534 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 2001-10-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 86 square meters per square second.19395878Sfc1 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
534 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
474 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
86 m²/s²
0-3 km storm-relative helicity
135 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

750 
WFUS54 KHGX 122145
TORHOU
TXC291-122230-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
445 PM CDT FRI OCT 12 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* TORNADO WARNING FOR...
  LIBERTY COUNTY IN SOUTHEAST TEXAS

* UNTIL 530 PM CDT

* AT 440 PM CDT...DOPPLER RADAR INDICATED A THUNDERSTORM CAPABLE OF
  PRODUCING A TORNADO 7 MILES WEST OF DAYTON...MOVING NORTHEAST AT 15
  MPH.

* LOCATIONS IN THE PATH OF THE TORNADO INCLUDE...
  DAYTON
  KENEFICK
  LIBERTY
  DAYTON LAKES...AMES

DRIVERS SHOULD LOOK FOR STRONG SHELTER. AS A LAST RESORT...TAKE COVER
IN A DITCH OR LOW SPOT. OVERPASSES ARE NOT SAFE

PLEASE REPORT SEVERE WEATHER TO THE COUNTY SHERIFF...LOCAL POLICE...
OR DEPARTMENT OF PUBLIC SAFETY. THEY WILL RELAY YOUR REPORT TO THE
NATIONAL WEATHER SERVICE.

LAT...LON 3009 9507 2994 9497 3005 9470 3025 9484

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at Oct 12, 2:30 PM CDT, 2 hours 15 minutes earlier.

Area forecast discussion, Oct 12, 2:30 PM CDT, 2 hours 15 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
230 PM CDT FRI OCT 12 2001

KHGX LIGHTING UP WITH CONVECTION IN THE LAST 15 MINUTES. THE MAIN
FORECAST ISSUES ARE SEVERE/HEAVY RAIN THREAT THROUGH SAT AM. THE 12Z
NCEP MODELS ARE IN POOR AGREEMENT...INCLUDING THE FWC/MAV GUIDANCE.
OVERALL PREFER THE ETA. WILL BLEND MAV/FWC FOR MOST PERIODS.

DESPITE SIGNIFICANT MODEL CHANGES...OLD FASHIONED TECHNIQUES SUCH AS
PRESSURE/HEIGHT FALLS SEEM TO SERVE THE FORECAST BEST. NO MAJOR
CHANGES OTHER THAN TO PUSH BACK TIMING OF THE SQUALL LINE TO 08-14Z
(3-9 AM) FOR MOST OF THE CWA. CONVECTION THIS AFTERNOON HAS THE
POTENTIAL FOR MINI-SUPERCELLS WITH ISOLD TORNADOES AND DAMAGING
WINDS AS OCCURRED ON THU. THE CHAMBERS COUNTY SHERIFF REPORTED A
FUNNEL CLOUD 7N OF WINNIE AT 155 PM.

OTHERWISE DAMAGING WINDS...LARGE HAIL...ISOLD TORNADOES...AND HEAVY
RAIN/FLOODING ARE ALL POSSIBLE WITH THE SQUALL LINE TONIGHT. WILL
RETAIN FFA/RIVER FLOOD WATCH AND SEVERE MENTION. MARINE FORECAST
WILL UPGRADE TO SCA FOR ALL WATERS AS THE LLJ AND INFLOW BOOT WINDS
TONIGHT.

.HGX...FFA ALL ZONES TONIGHT.
       RIVER FA SAN JACINTO/SAN BERNARD/TRES PALACIOS BASINS.
       SCA BAYS AND 0-60NM GULF WATERS.

31/47/WT

PRELIMS...
CLL EU 064/070 050/077 055 +40
IAH TU 072/075 052/076 054 +60
GLS TU 076/076 062/074 065 880

In the hours before

Special weather statement, Oct 12, 3:25 PM CDT, 1 hour 20 minutes before
GMZ330-335-350-355-370-375-TXZ163-164-176>179-195>200-210>214-226-227
-235>238-131000-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
325 PM CDT FRI OCT 12 2001

...SIGNIFICANT SEVERE WEATHER OUTBREAK EXPECTED ACROSS SOUTHEAST
TEXAS TONIGHT AND EARLY SATURDAY...

...FLASH FLOOD WATCH IN EFFECT FOR SOUTHEAST TEXAS TONIGHT...

A VERY STRONG UPPER LEVEL STORM SYSTEM WILL IMPACT SOUTHEAST TEXAS
TONIGHT AND SATURDAY. A COLD FRONT WILL SWEEP INTO NORTH CENTRAL
TEXAS THIS EVENING. THE COMBINATION OF WINDS TURNING AND
STRENGTHENING WITH HEIGHT IN THE ATMOSPHERE...A VERY UNSTABLE
AIRMASS AT THE SURFACE...AND COLD TEMPERATURES ALOFT WILL LEAD TO A
HIGH LIKELIHOOD OF SEVERE WEATHER LATE TONIGHT AND EARLY SATURDAY AS
THE STORM SYSTEM APPROACHES SOUTHEAST TEXAS. DAMAGING WINDS...
TORNADOES AND LARGE HAIL ARE ALL POSSIBLE.

A LINE OF STRONG TO SEVERE THUNDERSTORMS IS EXPECTED TO DEVELOP
ALONG THE FRONT. SCATTERED THUNDERSTORMS THAT DEVELOP AHEAD OF THE
LINE WILL ALSO BE A THREAT. THOUGH SEVERE WEATHER IS POSSIBLE
VIRTUALLY ALL NIGHT THE MAIN THREAT APPEARS TO BE BETWEEN 11 PM AND
6 AM FOR THE COLLEGE STATION AREA AND WESTERN PORTIONS OF
SOUTHEAST TEXAS...3 AM TO 9 AM FOR HOUSTON METRO AND CENTRAL
PORTIONS...4 AM TO 10 AM FOR COASTAL AND EASTERN PORTIONS.

VERY HEAVY RAINFALL IS ALSO EXPECTED WITH THE STORMS TONIGHT AND
EARLY SATURDAY. RAINFALL AMOUNTS WILL AVERAGE 1 TO 3 INCHES WITH
ISOLATED TOTALS OF 5 INCHES POSSIBLE BY LATE SATURDAY MORNING.
FLOODING OF LOW LYING ROADS AND FEEDERS WILL PROBABLY BE THE MAIN
PROBLEM.

THOUGH MOST PRECIPITATION WILL BE BE OVER BY NOON SATURDAY...THE
UPPER LOW PRESSURE AREA AND ASSOCIATED VERY COLD TEMPERATURES WILL
MOVE OVERHEAD DURING THE AFTERNOON HOURS. RESIDUAL MOISTURE MAY
CAUSE SCATTERED THUNDERSTORMS TO DEVELOP THAT WILL HAVE THE
POTENTIAL PRODUCE LARGE HAIL. THOUGH IT IS A FAIRLY LOW
PROBABILITY...PORTIONS ALONG AND EAST OF I-45 WILL SEE THE BETTER
CHANCES OF THIS HAPPENING.

SINCE MANY OF THE STORMS WILL OCCUR WHEN PEOPLE ARE SLEEPING...IT
WOULD BE WISE TO MAKE SURE YOUR WEATHER RADIO IS TURNED ON SO YOU
WILL HEAR ANY WARNINGS THAT THE NATIONAL WEATHER SERVICE ISSUES FOR
YOUR AREA. THIS INFORMATION CAN ALSO BE OBTAINED FROM YOUR FAVORITE
MEDIA OUTLET.

REMEMBER...THE BEST PLACE TO BE IF YOU ARE IN THE PATH OF A SEVERE
THUNDERSTORM OR TORNADO IS INSIDE A REINFORCED STRUCTURE AWAY FROM
WINDOWS.

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 12, 4:23 PM CDTSevere Thunderstorm WarningHGXHarris37 min

Nearby

Tornado Warnings in Texas, 2001Every tornado warning in 2001Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.