Alert archive / Texas / Tornado Watches in 2001

Tornado Watch 825

November 26, 20018 parishes in Louisiana; 15 counties in Texas

The Storm Prediction Center issued this tornado watch at Nov 26, 2001, 2:30 PM CST for 8 parishes in Louisiana; 15 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Nov 26, 2001, 2:30 PM CST (20:30 UTC)
Expired: Nov 26, 2001, 8:00 PM CST
In force: 6 hr
Issued by: the Storm Prediction Center

All 23 counties

Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Grant Parish, LA, LaSalle Parish, LA, Rapides Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Angelina County, TX, Chambers County, TX, Hardin County, TX, Harris County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Montgomery County, TX, Newton County, TX, Orange County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Tyler County, TX

The radar

The Lake Charles radar (KLCH), 121 km from the middle of the area, began a volume at 20:33 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.

Warnings issued inside it

6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Nov 26, 2:32 PM CST	Tornado Warning	HGX	Liberty	28 min
Nov 26, 2:51 PM CST	Severe Thunderstorm Warning	SHV	Sabine	39 min
Nov 26, 3:09 PM CST	Severe Thunderstorm Warning	LCH	Jasper, Tyler	66 min
Nov 26, 3:24 PM CST	Tornado Warning	SHV	Sabine	36 min
Nov 26, 4:41 PM CST	Tornado Warning	LCH	Jasper, Tyler	64 min
Nov 26, 6:06 PM CST	Tornado Warning	HGX	Liberty	39 min

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 8.5 hours before the alert went out and 122 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1330 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 488 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 179 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.1

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 262036
SEL5  
SPC WW 262030
LAZ000-TXZ000-CWZ000-270200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 825
STORM PREDICTION CENTER NORMAN OK
230 PM CST MON NOV 26 2001

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   SOUTHWEST LOUISIANA                          
   SOUTHEAST TEXAS                              
   ADJACENT COASTAL WATERS                     

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 230 PM UNTIL 800
PM CST.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 75 STATUTE MILES EAST AND WEST
OF A LINE FROM 50 MILES WEST SOUTHWEST OF PORT ARTHUR TEXAS TO 45
MILES NORTH OF FORT POLK LOUISIANA.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

OTHER WATCH INFORMATION...  CONTINUE...WW 824...

DISCUSSION...STRONG THUNDERSTORMS CONTINUE ACROSS AREA...BUT NOW
SEE DEEP LAYER SHEAR OF 40 KT OR GREATER MOVING THROUGH CENTRAL TX
TOWARDS AREA.  THIS WILL INCREASE VERTICAL SHEAR AND TORNADO
POTENTIAL IN ALREADY VERY UNSTABLE AIR MASS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 24035.


...MCCARTHY

314,0915 293,0933 293,0960 314,0942

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 26, 1:00 PM CST	Tornado Watch	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 8 more	5 hr
Nov 26, 3:30 PM CST	Tornado Watch	SPC	Catahoula, Concordia, East Carroll, Franklin, Madison, Tensas	5 hr

Nearby

Tornado Watches in Texas, 2001 Tornado Watches in Louisiana, 2001 Every tornado 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.