Alert archive / Texas / Tornado Watches in 2001

Tornado Watch 130

April 11, 20014 states

The Storm Prediction Center issued this tornado watch at Apr 11, 2001, 6:15 AM CDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 11, 2001, 6:15 AM CDT (11:15 UTC)
Expired
Apr 11, 2001, 12:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 53 counties

Benton County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Howard County, AR, Johnson County, AR, Little River County, AR, Logan County, AR, Madison County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Washington County, AR, Barry County, MO, McDonald County, MO, Newton County, MO, Stone County, MO, Adair County, OK, Cherokee County, OK, Choctaw County, OK, Craig County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McCurtain County, OK, Muskogee County, OK, Ottawa County, OK, Pushmataha County, OK, Sequoyah County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Delta County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Hunt County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Rains County, TX, Red River County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 11, 6:40 AM CDTSevere Thunderstorm WarningTSAChoctaw, Pushmataha65 min
Apr 11, 6:53 AM CDTSevere Thunderstorm WarningTSAHaskell, Muskogee, Sequoyah52 min
Apr 11, 6:53 AM CDTSevere Thunderstorm WarningTSALatimer52 min
Apr 11, 7:20 AM CDTSevere Thunderstorm WarningTSAMayes, Wagoner40 min
Apr 11, 7:26 AM CDTSevere Thunderstorm WarningTSALeFlore64 min
Apr 11, 7:28 AM CDTTornado WarningTSAHaskell, Sequoyah47 min
Apr 11, 7:33 AM CDTSevere Thunderstorm WarningTSACherokee27 min
Apr 11, 7:36 AM CDTSevere Thunderstorm WarningSHVRed River54 min
Apr 11, 7:44 AM CDTSevere Thunderstorm WarningTSACrawford, Sebastian46 min
Apr 11, 7:53 AM CDTSevere Thunderstorm WarningTSAAdair, Cherokee, Delaware52 min
Apr 11, 7:53 AM CDTSevere Thunderstorm WarningTSACraig, Mayes, Ottawa52 min
Apr 11, 8:03 AM CDTSevere Thunderstorm WarningTSABenton, Washington57 min
Apr 11, 8:27 AM CDTSevere Thunderstorm WarningTSACrawford, Franklin, Sebastian63 min
Apr 11, 8:27 AM CDTSevere Thunderstorm WarningTSALeFlore63 min
Apr 11, 8:47 AM CDTSevere Thunderstorm WarningTSABenton, Carroll, Madison, Washington58 min
Apr 11, 9:31 AM CDTSevere Thunderstorm WarningSGFBarry, Lawrence, Newton44 min
Apr 11, 9:34 AM CDTSevere Thunderstorm WarningTSAFranklin41 min
Apr 11, 9:38 AM CDTSevere Thunderstorm WarningTSACarroll, Madison52 min
Apr 11, 10:16 AM CDTSevere Thunderstorm WarningSGFChristian, Lawrence, Stone44 min
Apr 11, 10:22 AM CDTSevere Thunderstorm WarningLZKJohnson, Newton38 min

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 11.3 hours before the alert went out and 215 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, Shreveport, LA at 00:00Z on 2001-04-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 208 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, Shreveport, LA at 00:00Z on 2001-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 square meters per square second.1939587897Sfc1 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
208 J/kg
Mixed-layer CIN
-207 J/kg
Mixed-layer LCL
1609 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
117 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

000 
WWUS9 KMKC 111054
SEL0  

SEL0  
MKC WW 111048
ARZ000-MOZ000-OKZ000-TXZ000-111700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 130
STORM PREDICTION CENTER NORMAN OK
548 AM CDT WED APR 11 2001

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

   WESTERN ARKANSAS                           
   EXTREME SOUTHWEST MISSOURI                           
   EASTERN OKLAHOMA                           
   NORTHEAST TEXAS                              

EFFECTIVE THIS WEDNESDAY MORNING FROM 615 AM UNTIL NOON CDT.

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 60 STATUTE MILES EAST AND WEST
OF A LINE FROM 15 MILES SOUTH SOUTHEAST OF TYLER TEXAS TO 15 MILES
WEST NORTHWEST OF MONETT MISSOURI.

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 126...WW 127...WW
128...WW 129...

DISCUSSION...LINE OF STRONG/SEVERE STORMS FROM EAST CENTRAL
OKLAHOMA INTO NORTH CENTRAL TEXAS IS EXPECTED TO CONTINUE MOVING
NEWD THROUGH THE MORNING HOURS.  ACTIVITY IS LOCATED IN ADVANCE OF
VERY STRONG UPPER TROUGH LIFTING NEWD ACROSS THE CENTRAL/SRN
PLAINS.  VERY STRONG FLOW ALOFT WITH 100 KT AT 500 MB AND 60-70 KT
WITHIN 2 KM OF THE SURFACE IS RESULTING IN VERY STRONG LOW LEVEL
SHEAR/HELICITY SUPPORTIVE OF SUPERCELL DEVELOPMENT AND POSSIBLE
TORNADOES.


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 450. 
MEAN STORM MOTION VECTOR 22055.


...WEISS

;365,0930 320,0941 320,0961 365,0951;

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 11, 10:00 AM CDTSevere Thunderstorm WatchSPCArkansas, Baxter, Boone, Clay, Cleburne, Conway and 36 more5 hr
Apr 10, 7:00 PM CDTSevere Thunderstorm WatchSPCAudrain, Franklin, Jefferson, Lincoln, Montgomery, Saint Charles and 4 more5 hr
Apr 11, 2:00 AM CDTTornado WatchSPCAtchison5 hr
Apr 11, 4:00 AM CDTSevere Thunderstorm WatchSPCAndrew, Buchanan, Caldwell, Daviess, DeKalb, Gentry and 10 more5 hr
Apr 11, 9:30 AM CDTTornado WatchSPCAndrew, Barton, Bates, Benton, Buchanan, Caldwell and 47 more6 hr
Apr 11, 10:45 AM CDTTornado WatchSPCAtchison, Gentry, Grundy, Harrison, Holt, Nodaway and 1 more5 hr
Apr 11, 1:00 PM CDTTornado WatchSPCAdair, Audrain, Boone, Callaway, Clark, Cole and 20 more6 hr
Apr 10, 8:30 PM CDTSevere Thunderstorm WatchSPCBeaver, Cimarron, Texas5 hr
Apr 10, 9:30 PM CDTTornado WatchSPCCaddo, Comanche, Cotton, Grady, Jefferson, Stephens and 1 more6 hr
Apr 11, 12:00 AM CDTTornado WatchSPCAlfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 17 more4 hr
Apr 11, 3:15 AM CDTTornado WatchSPCAtoka, Bryan, Canadian, Carter, Cleveland, Coal and 34 more5 hr
Apr 10, 7:00 PM CDTTornado WatchSPCArmstrong, Borden, Briscoe, Carson, Childress, Collingsworth and 32 more5 hr
Apr 10, 8:45 PM CDTTornado WatchSPCCoke, Crockett, Edwards, Irion, Nolan, Reagan and 6 more3 hr
Apr 11, 2:45 AM CDTTornado WatchSPCBell, Bosque, Brown, Clay, Collin, Comanche and 30 more5 hr

Nearby

Tornado Watches in Texas, 2001Tornado Watches in Arkansas, 2001Tornado Watches in Oklahoma, 2001Every 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.