Alert archive / Texas / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 21

February 16, 2001De Soto Parish, Louisiana; 29 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Feb 16, 2001, 2:00 AM CST for De Soto Parish, Louisiana; 29 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Feb 16, 2001, 2:00 AM CST (08:00 UTC)
Expired
Feb 16, 2001, 7:00 AM CST
In force
5 hr
Issued by
the Storm Prediction Center
All 30 counties

De Soto Parish, LA, Anderson County, TX, Angelina County, TX, Austin County, TX, Brazos County, TX, Burleson County, TX, Cherokee County, TX, Fayette County, TX, Freestone County, TX, Grimes County, TX, Harris County, TX, Henderson County, TX, Houston County, TX, Leon County, TX, Liberty County, TX, Madison County, TX, Montgomery County, TX, Nacogdoches County, TX, Panola County, TX, Polk County, TX, Robertson County, TX, Rusk County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX

The radar

The Houston radar (KHGX), 155 km from the middle of the area, began a volume at 08:01 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 00:00Z, 8.0 hours before the alert went out and 251 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 2001-02-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 924 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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 2001-02-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 122 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
924 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
559 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
122 m²/s²
0-3 km storm-relative helicity
130 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.8

Open this sounding in Storm Lab

The text

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

000 
WWUS9 KMKC 160753
SEL1  

SEL1  
MKC WW 160748
TXZ000-161300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 21
STORM PREDICTION CENTER NORMAN OK
148 AM CST FRI FEB 16 2001

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   EAST TEXAS                              

EFFECTIVE THIS FRIDAY MORNING FROM 200 AM UNTIL 700 AM CST.

HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 70 STATUTE MILES
EAST AND WEST OF A LINE FROM 65 MILES SOUTH SOUTHEAST OF COLLEGE
STATION TEXAS TO 75 MILES NORTH OF LUFKIN TEXAS.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

DISCUSSION...SHOWERS AND THUNDERSTORMS CONTINUE TO INCREASE IN
AREAL COVERAGE OVER MUCH FO CENTRAL TX...PRIMARILY ALONG AND BEHIND
SURFACE COLD FRONT.  SQUALL LINE MAY FORM ALONG FRONT IN THE NEXT
FEW HOURS AS STRONG UPPER DYNAMICS SPREAD EASTWARD INTO REGION. 
STRONG ENVIRONMENTAL WINDS AND MOIST/UNSTABLE AIRMASS INDICATE THE
THREAT OF DAMAGING WINDS AND HAIL IN STRONGER CELLS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. 
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM MOTION
VECTOR 24040.

...HART

;294,0970 321,0955 321,0933 294,0944;

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 16, 10:00 AM CSTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Cameron and 22 more5 hr
Feb 15, 9:15 PM CSTSevere Thunderstorm WatchSPCBandera, Bexar, Blanco, Caldwell, Comal, Edwards and 15 more5 hr

Nearby

Severe Thunderstorm Watches in Texas, 2001Severe Thunderstorm Watches in Louisiana, 2001Every severe thunderstorm watch 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.