Alert archive / Texas / Tornado Watches in 2003

Tornado Watch 49

March 17, 200325 counties in Oklahoma; 26 counties in Texas

The Storm Prediction Center issued this tornado watch at Mar 17, 2003, 5:50 PM CST for 25 counties in Oklahoma; 26 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Mar 17, 2003, 5:50 PM CST (23:50 UTC)
Expired
Mar 17, 2003, 11:00 PM CST
In force
5 hr
Issued by
the Storm Prediction Center
All 51 counties

Bryan County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Kiowa County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Okfuskee County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Clay County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Denton County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Grayson County, TX, Hood County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, Somervell County, TX, Tarrant County, TX, Van Zandt County, TX, Wichita County, TX, Wise County, TX, Young County, TX

The radar

The Norman radar (KTLX), 124 km from the middle of the area, began a volume at 23:53 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

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

IssuedProductOfficeCountiesLasted
Mar 17, 6:01 PM CSTTornado WarningOUNComanche, Stephens29 min
Mar 17, 6:31 PM CSTSevere Thunderstorm WarningOUNGrady, Stephens44 min
Mar 17, 6:43 PM CSTSevere Thunderstorm WarningOUNCleveland47 min
Mar 17, 7:14 PM CSTSevere Thunderstorm WarningOUNGrady61 min
Mar 17, 7:27 PM CSTSevere Thunderstorm WarningOUNGarvin, McClain48 min
Mar 17, 8:13 PM CSTSevere Thunderstorm WarningOUNCleveland, McClain47 min
Mar 17, 8:59 PM CSTSevere Thunderstorm WarningOUNCleveland16 min
Mar 17, 9:21 PM CSTSevere Thunderstorm WarningOUNPottawatomie54 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.8 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, Norman, OK at 12:00Z on 2003-03-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 264 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, Norman, OK at 12:00Z on 2003-03-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 119 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
264 J/kg
Mixed-layer CIN
-285 J/kg
Mixed-layer LCL
965 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
119 m²/s²
0-3 km storm-relative helicity
97 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 172340
SEL9  
SPC WW 172350
OKZ000-TXZ000-180500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 49
STORM PREDICTION CENTER NORMAN OK
550 PM CST MON MAR 17 2003

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

   SOUTHERN OKLAHOMA                           
   NORTH CENTRAL TEXAS                              

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 550 PM UNTIL 1100
PM CST.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 85 STATUTE MILES EAST AND WEST
OF A LINE FROM 15 MILES NORTHWEST OF OKLAHOMA CITY OKLAHOMA TO 45
MILES SOUTH SOUTHEAST OF FORT WORTH 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 SEVERE
THUNDERSTORM WATCH NUMBER 47.  WATCH NUMBER 47 WILL NOT BE IN
EFFECT AFTER 550 PM CST.  CONTINUE...WW 48...

DISCUSSION...ISOLATED SUPERCELLS CONTINUE OVER PARTS OF SOUTHERN OK
AND NORTH TX.  LATEST MESOANALYSIS SHOWS BACKED LOW LEVEL
WINDS...INCREASING CONVERGENCE ALONG DRYLINE AND INCREASING
VERTICAL SHEAR.  SEVERAL WEAK BOUNDARIES ALSO EXIST ACROSS SOUTHERN
OK...INDICATING LOCALLY FAVORABLE AREAS FOR TORNADOES.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 24035.

...HART

353,0961 321,0953 321,0983 353,0991

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 16, 8:09 PM CSTMesoscale DiscussionSPCBeckham, Greer, Harmon, Jackson3 hr
Mar 17, 11:40 AM CSTMesoscale DiscussionSPCAlfalfa, Beaver, Blaine, Caddo, Canadian, Comanche and 16 more3 hr
Mar 17, 12:45 PM CSTSevere Thunderstorm WatchSPCBryan, Caddo, Canadian, Carter, Cleveland, Coal and 19 more6 hr
Mar 17, 1:55 PM CSTSevere Thunderstorm WatchSPCAlfalfa, Blaine, Custer, Dewey, Garfield, Grant and 10 more5 hr
Mar 17, 2:47 PM CSTMesoscale DiscussionSPCAlfalfa, Blaine, Canadian, Garfield, Grant, Kingfisher and 2 more118 min
Mar 17, 3:02 PM CSTMesoscale DiscussionSPCCarter, Jefferson, Love118 min
Mar 17, 3:24 PM CSTMesoscale DiscussionSPCBeaver, Beckham, Carter, Greer, Jackson, Jefferson and 3 more2 hr
Mar 17, 11:17 AM CSTMesoscale DiscussionSPCAnderson, Bosque, Collin, Dallas, Denton, Ellis and 19 more2 hr

Nearby

Tornado Watches in Texas, 2003Tornado Watches in Oklahoma, 2003Every tornado watch in 2003

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.