Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 709

May 3, 20034 states

The Storm Prediction Center issued this mesoscale discussion at May 3, 2003, 3:42 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 3, 2003, 3:42 PM CDT (20:42 UTC)
Expired
May 3, 2003, 5:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 50 counties

Columbia County, AR, Hempstead County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Sevier County, AR, Bossier Parish, LA, Caddo Parish, LA, De Soto Parish, LA, Red River Parish, LA, Webster Parish, LA, Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Garvin County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, McClain County, OK, McCurtain County, OK, Murray County, OK, Pontotoc County, OK, Pushmataha County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Collin County, TX, Cooke County, TX, Delta County, TX, Denton County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Gregg County, TX, Harrison 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, Rockwall County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 182 km from the middle of the area, began a volume at 20:48 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

Shreveport, LA (KSHV), launched 12:00Z, 8.7 hours before the alert went out and 187 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 12:00Z on 2003-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2724 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 12:00Z on 2003-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 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
2724 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
605 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
102 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.3

Open this sounding in Storm Lab

The text

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

070 
ACUS11 KWNS 032042
SWOMCD
SPC MCD 032042 
ARZ000-LAZ000-TXZ000-OKZ000-032245-

MESOSCALE DISCUSSION 0709
NWS STORM PREDICTION CENTER NORMAN OK
0342 PM CDT SAT MAY 03 2003

AREAS AFFECTED...SERN OK...NERN/N CNTRL TX...SWRN AR ANS NWRN LA

CONCERNING...TORNADO WATCH 220...

VALID 032042Z - 032245Z

WIDELY SCATTERED STORMS EXPECTED TO DEVELOP ALONG/N OF WARM FRONT
ACROSS PARTS OF THE ARKLATEX REGION LATER THIS AFTERNOON. TIMING OF
INITIATION REMAINS UNCERTAIN. ONCE STORMS DEVELOP...SUPERCELLS WILL
BE LIKELY.

WARM FRONT FROM NRN LA WNWWD THROUGH NERN TX CONTINUES TO LIFT
SLOWLY NWD. ATMOSPHERE HAS BECOME VERY UNSTABLE IN VICINITY OF THIS
BOUNDARY WITH MLCAPES NOW FROM 2500 TO 3000 J/KG. HOWEVER... SPECIAL
18Z SOUNDINGS FROM FORT WORTH AND SHREVEPORT SHOWED A CAPPING
INVERSION...AND CUMULUS CLOUDS ALONG THE BOUNDARY STILL APPEAR
SOMEWHAT SUPPRESSED ON CURRENT SATELLITE IMAGERY. STORM INITIATION
HAS BEEN INHIBITED SO FAR BY PRESENCE OF CAP...WEAK LOW LEVEL
FLOW/CONVERGENCE ALONG THE WARM FRONT AND LARGE SCALE SUBSIDENCE
ASSOCIATED WITH UPPER RIDGE. LOW LEVEL JET WILL BEGIN TO INCREASE
LATER THIS AFTERNOON/EVENING...ESPECIALLY OVER WRN HALF OF WW AS
RIDGE AXIS SHIFTS EWD...AND THIS MAY ENHANCE LIFT ALONG/N OF THE
BOUNDARY. THUS INITIATION IS STILL POSSIBLE...BUT PROBABLY MORE
LIKELY LATER THIS AFTERNOON/EARLY EVENING.


..DIAL.. 05/03/2003

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...LZK...SHV...TSA...FWD...OUN...

33729305 33039303 32229308 31769307 32029384 32189474
32469545 32779631 33039710 33189753 33669757 34169760
34659758 35069759 34829662 34579565 34399509 34169439

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 2, 9:30 PM CDTMesoscale DiscussionSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 13 more2 hr
May 2, 9:50 PM CDTSevere Thunderstorm WatchSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 15 more5 hr
May 2, 11:42 PM CDTMesoscale DiscussionSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 15 more93 min
May 3, 2:36 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleburne and 26 more24 min
May 3, 12:29 PM CDTMesoscale DiscussionSPCColumbia, Hempstead, Lafayette, Little River, Miller, Nevada and 2 more3 hr
May 3, 1:40 PM CDTTornado WatchSPCColumbia, Hempstead, Lafayette, Little River, Miller, Nevada and 1 more6 hr
May 3, 6:49 PM CDTMesoscale DiscussionSPCColumbia, Hempstead, Lafayette, Little River, Miller, Nevada and 1 more56 min
May 3, 4:36 PM CDTMesoscale DiscussionSPCLivingston, Orleans, Saint Charles, Saint Helena, Saint John the Baptist, Saint Tammany and 2 more114 min
May 3, 4:45 PM CDTSevere Thunderstorm WatchSPCConcordia, East Baton Rouge, East Carroll, East Feliciana, Franklin, Livingston and 9 more5 hr
May 3, 1:42 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Greer, Harmon, Jackson, Roger Mills and 2 more3 hr
May 3, 4:00 PM CDTTornado WatchSPCCaddo, Comanche, Cotton, Grady, Greer, Harmon and 5 more5 hr
May 3, 6:10 PM CDTMesoscale DiscussionSPCBeckham, Blaine, Caddo, Comanche, Cotton, Custer and 11 more65 min
May 2, 8:09 PM CDTMesoscale DiscussionSPCAnderson, Bell, Bosque, Burnet, Comanche, Coryell and 23 more96 min
May 2, 10:25 PM CDTMesoscale DiscussionSPCBosque, Brown, Callahan, Coleman, Comanche, Concho and 11 more95 min

Nearby

Mesoscale Discussions in Texas, 2003Mesoscale Discussions in Oklahoma, 2003Mesoscale Discussions in Arkansas, 2003Every mesoscale discussion 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.