Alert archive / Texas / Tornado Watches in 2001

Tornado Watch 127

April 11, 200136 counties in Texas

The Storm Prediction Center issued this tornado watch at Apr 11, 2001, 2:45 AM CDT for 36 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 11, 2001, 2:45 AM CDT (07:45 UTC)
Expired
Apr 11, 2001, 8:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 36 counties

Bell County, TX, Bosque County, TX, Brown County, TX, Clay County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Coryell County, TX, Dallas County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Grayson County, TX, Hamilton County, TX, Hill County, TX, Hood County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Lampasas County, TX, McCulloch County, TX, McLennan County, TX, Mills County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Rockwall County, TX, San Saba County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Wise County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 94 km from the middle of the area, began a volume at 07:45 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.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 11, 2:55 AM CDTSevere Thunderstorm WarningFWDMontague, Wise65 min
Apr 11, 2:59 AM CDTSevere Thunderstorm WarningFWDComanche61 min
Apr 11, 2:59 AM CDTSevere Thunderstorm WarningSJTMcCulloch31 min
Apr 11, 3:28 AM CDTSevere Thunderstorm WarningFWDParker62 min
Apr 11, 3:33 AM CDTSevere Thunderstorm WarningFWDCooke57 min
Apr 11, 3:34 AM CDTSevere Thunderstorm WarningFWDMills41 min
Apr 11, 3:42 AM CDTSevere Thunderstorm WarningFWDHamilton63 min
Apr 11, 3:44 AM CDTSevere Thunderstorm WarningFWDErath, Somervell46 min
Apr 11, 3:51 AM CDTTornado WarningFWDCooke24 min
Apr 11, 4:12 AM CDTSevere Thunderstorm WarningFWDBosque63 min
Apr 11, 4:16 AM CDTSevere Thunderstorm WarningFWDDenton, Grayson59 min
Apr 11, 4:25 AM CDTSevere Thunderstorm WarningFWDJohnson50 min
Apr 11, 4:53 AM CDTSevere Thunderstorm WarningFWDTarrant37 min
Apr 11, 4:56 AM CDTSevere Thunderstorm WarningFWDHill34 min
Apr 11, 5:04 AM CDTSevere Thunderstorm WarningFWDDallas41 min
Apr 11, 5:15 AM CDTSevere Thunderstorm WarningFWDEllis30 min
Apr 11, 5:45 AM CDTSevere Thunderstorm WarningFWDKaufman45 min

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 7.8 hours before the alert went out and 113 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, Fort Worth, TX at 00:00Z on 2001-04-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1205 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, Fort Worth, TX at 00:00Z on 2001-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 191 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
1205 J/kg
Mixed-layer CIN
-116 J/kg
Mixed-layer LCL
1008 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
191 m²/s²
0-3 km storm-relative helicity
261 m²/s²
Significant tornado parameter
1.1
Supercell composite
8.1

Open this sounding in Storm Lab

The text

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

000 
WWUS9 KMKC 110723
SEL7  

SEL7  
MKC WW 110718
TXZ000-111300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 127
STORM PREDICTION CENTER NORMAN OK
218 AM CDT WED APR 11 2001

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

   NORTHERN AND CENTRAL TEXAS                              

EFFECTIVE THIS WEDNESDAY MORNING FROM 245 AM UNTIL 800 AM 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 80 STATUTE MILES EAST AND WEST
OF A LINE FROM 65 MILES SOUTH SOUTHEAST OF BROWNWOOD TEXAS TO 70
MILES NORTH OF DALLAS TEXAS.

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...THIS TORNADO WATCH REPLACES TORNADO WATCH
NUMBER 123.  WATCH NUMBER 123 WILL NOT BE IN EFFECT AFTER 245 AM
CDT.  CONTINUE...WW 124...WW 125...WW 126...   ALSO...A NEW WW WILL
BE ISSUED SHORTLY ACROSS CENTRAL/ERN OK INTO SERN KS.

DISCUSSION...STORNG STORMS ARE BECOMING BETTER ORGANIZED OVER
CENTRAL TX IN ADVANCE OF SHORT WAVE TROUHG LIFTING NEWD ACROSS THE
SRN ROCKIES.  WIND PROFILES REMAIN SUPPORTIVE OF SEVERE STORMS WITH
POTENTIAL FOR 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 23050.


...WEISS

;335,0952 305,0971 305,0995 335,0981;

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
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 10, 9:30 PM CDTTornado WatchSPCArcher, Baylor, Brown, Callahan, Clay, Coleman and 26 more6 hr
Apr 11, 12:00 AM CDTTornado WatchSPCChildress, Collingsworth, Cottle, Hall, Hardeman, Hemphill and 2 more4 hr
Apr 11, 6:15 AM CDTTornado WatchSPCBowie, Camp, Cass, Delta, Franklin, Gregg and 15 more6 hr

Nearby

Tornado Watches in Texas, 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; radar from the NEXRAD Level II archive.