Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 10, NWS Houston/Galveston, TX

February 28, 2001Liberty County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Feb 28, 2001, 5:43 AM CST for Liberty County, Texas. It was in force for 62 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Feb 28, 2001, 5:43 AM CST (11:43 UTC)
Expired
Feb 28, 2001, 6:45 AM CST
In force
62 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), 80 km from the middle of the area, began a volume at 11:42 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
Feb 28, 6:00 AM CSTThunderstorm WindRaywood, TXTrees down between Raywood and Devers along US 90.

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 00:00Z, 11.7 hours before the alert went out and 155 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 00:00Z on 2001-02-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1318 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 00:00Z on 2001-02-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 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
1318 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
723 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
44 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.8

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Feb 28, 3:00 AM CST, 2 hours 43 minutes earlier.

Area forecast discussion, Feb 28, 3:00 AM CST, 2 hours 43 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
300 AM CST WED FEB 28 2001

COLD FRONT NEAR HUNTSVILLE...SHOULD APPROACH IAH NEAR 11Z AND
NEAR COAST AROUND 13Z OR SO. 15-20 MILE WIDE BAND OF SHRA/TSRA ALONG
FRONT W/WIDLY SCATTERED CONVECTION ELSEWHERE CWFA. UPPER 60S
DEWPOINTS OVER COASTAL ZONES AND 60S ELSEWHERE AHEAD OF FRONT. 850
MB ANALYSIS INDICATE WIDE AREA OF 10-12 DEG F DEWPOINTS (MUCH OF
LONE STAR STATE). WEAK UPPER LEVEL DIVERGENCE EVIDENT E TX BUT MID
LEVEL LAPSE RATES NOT STRONG. LLVL JET NOT THAT STRONG EITHER.
HENCE...DO NOT EXPECT SEVERE WEATHER FROM THIS FRONT AS IT MOVES
ACROSS CWFA THIS MORNING. CONVECTION WILL BECOME MORE FOCUSED ONCE
IT REACH COASTAL WATERS TODAY. APPROACHING COLD FRONT AND
PRE-FRONTAL TROUGH WILL MAKE WIND DIRECTION FORECAST ACROSS COASTAL
WATERS QUITE A CHALLENGE TODAY. TEMPERATURE CONTRAST ABOUT 30 DEG F
DIFFERENCE BETWEEN FTW AND HGX. DITTO DEWPOINTS. MAX TEMPS TODAY
OBVIOUSLY WILL BE IN THE MORNING W/READINGS LOWERING THE REST OF THE
DAY. MOIST AIR MASS ON TOP OF INVERSION WILL REMAIN UNSTABLE W/SW
FLOW. INSTABILITY WILL INCREASE ALONG W/PW VALUES LATE THURSDAY TO
FRIDAY AND SFC COASTAL TROUGH/LOW WILL ENHANCE LLVL CONVERGENCE.
POSSIBLE HEAVY PCPN DURING THIS PERIOD. AVN HINTS AT DRY MID/UPPER
LEVEL SLOT PUNCHING THROUGH SATURDAY LOWERING PW VALUES TO UNDER AN
INCH BY MID DAY (WE SHALL SEE). HOWEVER...WRAP-AROUND MOISTURE FROM
UPPER LOW PROBABLY WILL GIVE REGION CHC PRECIP DURING THE WEEKEND.

.KHGX...NONE.

37/42/39

PRELIMS...
CLL TR 056/044 050/046 056 755
IAH TR 068/050 055/049 060 755
GLS TR 066/054 060/056 064 765

V

In the hours before

Special weather statement, Feb 28, 4:15 AM CST, 1 hour 28 minutes before
TXZ163-164-176>179-195>200-210>214-226-227-235>238-282200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
415 AM CST WED FEB 28 2001

...HEAVY RAIN EVENT POSSIBLE FOR SOUTHEAST TEXAS LATE THURSDAY THROUGH
SATURDAY...

A COLD FRONT WILL MOVE ACROSS SOUTHEAST TEXAS THIS MORNING AND SLOW
DOWN NEAR THE COAST. THE FRONT IS EXPECTED TO SLOWLY MOVE TO THE
COASTAL WATERS BY THURSDAY. MEANWHILE...OVERRUNNING MOIST GULF AIR
WILL CONTINUE TO GIVE OUR REGION A CHANCE RAIN THE NEXT SEVERAL DAYS.

AN APPROACHING UPPER LEVEL DISTURBANCE WILL INCREASE RAIN CHANCES LATE
THURSDAY THROUGH SATURDAY. THE SOIL SOAKED BY PREVIOUS RAINS WILL
CAUSE HEAVY RAINFALL TO READILY RUNOFF INTO LOW LYING AREAS. THIS MAY
PRODUCE FLOODING NEAR RIVERS...STREAMS AND OTHER LOW LYING AREAS.

ALTHOUGH EXACT AMOUNTS ARE DIFFICULT TO DETERMINE AT THIS TIME...
RAINFALL TOTALS THROUGH SATURDAY WILL PROBABLY BE 1 TO 3 INCHES
WITH HIGHER LOCALIZED AMOUNTS.

LATER UPDATES TO THIS STATEMENT WILL PROVIDE MORE DETAILS AS THIS
WEATHER SITUATION EVOLVES. RESIDENTS OF SOUTHEAST TEXAS SHOULD
KEEP ABREAST OF THIS SITUATION BY LISTENING TO NOAA WEATHER RADIO OR
OTHER MEDIA SOURCES.

STAY TUNED TO NOAA WEATHER RADIO OR OTHER NEWS SOURCES FOR THE LATEST
FORECAST...STATEMENTS...AND POSSIBLE WARNINGS.
Special weather statement, Feb 28, 4:53 AM CST, 50 minutes before
TXZ163-164-176>179-195>200-210>214-226-227-235>238-282200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
415 AM CST WED FEB 28 2001

...HEAVY RAIN EVENT POSSIBLE FOR SOUTHEAST TEXAS LATE THURSDAY THROUGH
SATURDAY...

A COLD FRONT WILL MOVE ACROSS SOUTHEAST TEXAS THIS MORNING AND SLOW
DOWN NEAR THE COAST. THE FRONT IS EXPECTED TO SLOWLY MOVE TO THE
COASTAL WATERS BY THURSDAY. MEANWHILE...OVERRUNNING MOIST GULF AIR
WILL CONTINUE TO GIVE OUR REGION A CHANCE RAIN THE NEXT SEVERAL DAYS.

AN APPROACHING UPPER LEVEL DISTURBANCE WILL INCREASE RAIN CHANCES LATE
THURSDAY THROUGH SATURDAY. THE SOIL SOAKED BY PREVIOUS RAINS WILL
CAUSE HEAVY RAINFALL TO READILY RUNOFF INTO LOW LYING AREAS. THIS MAY
PRODUCE FLOODING NEAR RIVERS...STREAMS AND OTHER LOW LYING AREAS.

ALTHOUGH EXACT AMOUNTS ARE DIFFICULT TO DETERMINE AT THIS TIME...
RAINFALL TOTALS THROUGH SATURDAY WILL PROBABLY BE 1 TO 3 INCHES
WITH HIGHER LOCALIZED AMOUNTS.

LATER UPDATES TO THIS STATEMENT WILL PROVIDE MORE DETAILS AS THIS
WEATHER SITUATION EVOLVES. RESIDENTS OF SOUTHEAST TEXAS SHOULD
KEEP ABREAST OF THIS SITUATION BY LISTENING TO NOAA WEATHER RADIO OR
OTHER MEDIA SOURCES.

STAY TUNED TO NOAA WEATHER RADIO OR OTHER NEWS SOURCES FOR THE LATEST
FORECAST...STATEMENTS...AND POSSIBLE WARNINGS.

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 28, 6:04 AM CSTTornado WarningHGXLiberty41 min

Nearby

Severe Thunderstorm Warnings in Texas, 2001Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.