Alert archive / Oklahoma / Mesoscale Discussions in 2003

Mesoscale Discussion 503

April 19, 200331 counties in Oklahoma; 10 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2003, 3:15 PM CDT for 31 counties in Oklahoma; 10 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 19, 2003, 3:15 PM CDT (20:15 UTC)
Expired
Apr 19, 2003, 5:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 41 counties

Atoka County, OK, Bryan County, OK, Choctaw County, OK, Cleveland County, OK, Coal County, OK, Creek County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, Lincoln County, OK, Marshall County, OK, Mayes County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Collin County, TX, Dallas County, TX, Delta County, TX, Ellis County, TX, Fannin County, TX, Grayson County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Rockwall County, TX

The radar

The Norman radar (KTLX), 121 km from the middle of the area, began a volume at 20:15 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

Norman, OK (KOUN), launched 12:00Z, 8.3 hours before the alert went out and 118 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 2003-04-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 274 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, Norman, OK at 12:00Z on 2003-04-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 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
274 J/kg
Mixed-layer CIN
-192 J/kg
Mixed-layer LCL
680 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
395 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.5

Open this sounding in Storm Lab

The text

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

070 
ACUS11 KWNS 192015
SWOMCD
SPC MCD 192015 
OKZ000-TXZ000-192215-

MESOSCALE DISCUSSION 0503
NWS STORM PREDICTION CENTER NORMAN OK
0315 PM CDT SAT APR 19 2003

AREAS AFFECTED...PORTIONS SRN KS...NWRN THRU ERN OK

CONCERNING...TORNADO WATCH 131...132...

VALID 192015Z - 192215Z

RAPID DEVELOPMENT OF SUPERCELLS POSSIBLE NEXT 1-2 HOURS OVER SWRN
PORTIONS WW 132 AND CENTRAL/ERN WW 131...WITH ALL SEVERE MODES
INCLUDING TORNADOES POSSIBLE.  SEVERAL CB...INCLUDING PROBABLE
SUPERCELL OVER HARPER COUNTY OK...WILL MOVE NEWD ACROSS NWRN OK
INTO SWRN KS WITH POTENTIAL FOR TORNADOES AND DAMAGING HAIL.  

LATEST SFC MESOANALYSIS SHOWS DRYLINE HAS ESSENTIALLY BLENDED
WITH CONFLUENCE LINE ACROSS OK...AND EXTENDS FROM SFC LOW INVOF
OCHILTREE/LIPSCOMB COUNTIES TX THROUGH WOODWARD COUNTY...NEAR
END...THEN SEWD ACROSS POTTAWATOMIE AND JOHNSTON COUNTIES OK.  
VIS IMAGERY AND VISUAL OBSERVATIONS SHOW INCREASING DEPTH/WIDTH
TO REMAINING TOWERS WITHIN THIS ARC AND GLACIATION OF SEVERAL
TCU. ADDITIONAL TSTMS SHOULD DEVELOP FROM SOME OF THESE TOWERS
WITHIN NEXT 1-2 HOURS..PARTICULARLY IN REGION SSE-SW OF END AND
NW-SW OF MLC...INVOF LOCALIZED CONVERGENCE MAXIMA.  MODIFIED
RAOBS AND RUC SOUNDINGS INDICATE SHALLOW BUT DENSE CAPE PROFILE
OVER NWRN OK...LAPSE RATES NEAR 9 DEG C/KM...-12 TO -18 MIN LI
AND MLCAPE 1500-2000 J/KG.  THIS TRANSITIONS TO SOMEWHAT LARGER
MLCAPE OVER ERN OK...WHERE SFC DEW POINTS MID-UPPER 60S F OFFSET
SOMEWHAT WEAKER -- BUT STILL FAVORABLE -- MIDLEVEL LAPSE RATES.  

..EDWARDS.. 04/19/2003

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

ATTN...WFO...TSA...FWD...OUN...

33669695 34689714 35439768 36999660 36719495 33939542
32669601 32219703

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 18, 8:31 PM CDTMesoscale DiscussionSPCCaddo, Cleveland, Comanche, Cotton, Grady, Greer and 8 more2 hr
Apr 18, 9:50 PM CDTSevere Thunderstorm WatchSPCBeckham, Caddo, Canadian, Cleveland, Comanche, Cotton and 13 more6 hr
Apr 18, 11:32 PM CDTMesoscale DiscussionSPCBeckham, Caddo, Canadian, Cleveland, Comanche, Cotton and 10 more118 min
Apr 19, 12:58 AM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Custer, Dewey, Ellis, Garfield and 6 more2 hr
Apr 19, 1:20 AM CDTTornado WatchSPCComanche, Cotton, Greer, Harmon, Jackson, Kiowa and 2 more7 hr
Apr 19, 1:25 AM CDTSevere Thunderstorm WatchSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 18 more7 hr
Apr 19, 3:18 AM CDTMesoscale DiscussionSPCAdair, Atoka, Bryan, Cherokee, Choctaw, Coal and 30 more117 min
Apr 19, 4:11 AM CDTMesoscale DiscussionSPCComanche, Cotton, Jackson, Kiowa, Stephens, Tillman2 hr
Apr 19, 4:52 AM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 14 more113 min
Apr 19, 9:01 AM CDTMesoscale DiscussionSPCAdair, Atoka, Bryan, Cherokee, Choctaw, Coal and 19 more3 hr
Apr 19, 1:10 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Canadian, Cleveland, Creek, Dewey and 18 more2 hr
Apr 19, 1:15 PM CDTTornado WatchSPCAlfalfa, Blaine, Canadian, Custer, Dewey, Ellis and 14 more7 hr
Apr 19, 2:02 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Choctaw, Cleveland, Coal, Creek and 25 more88 min
Apr 19, 2:30 PM CDTTornado WatchSPCAtoka, Bryan, Cherokee, Choctaw, Coal, Craig and 32 more7 hr
Apr 19, 5:50 PM CDTMesoscale DiscussionSPCAlfalfa, Garfield, Grant, Kay, Kingfisher, Noble85 min
Apr 19, 6:07 PM CDTMesoscale DiscussionSPCAdair, Atoka, Cherokee, Choctaw, Coal, Craig and 27 more83 min
Apr 18, 9:21 PM CDTMesoscale DiscussionSPCBandera, Bexar, Blanco, Comal, Dimmit, Edwards and 12 more54 min

Nearby

Mesoscale Discussions in Oklahoma, 2003Mesoscale Discussions in Texas, 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.