Alert archive / Arkansas / Mesoscale Discussions in 2003

Mesoscale Discussion 567

April 24, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2003, 5:52 PM CDT for 4 states. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
Apr 24, 2003, 5:52 PM CDT (22:52 UTC)
Expired
Apr 24, 2003, 7:45 PM CDT
In force
113 min
Issued by
the Storm Prediction Center
All 67 counties

Arkansas County, AR, Baxter County, AR, Boone County, AR, Clay County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Faulkner County, AR, Fulton County, AR, Grant County, AR, Greene County, AR, Hot Spring County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Marion County, AR, Mississippi County, AR, Monroe County, AR, Newton County, AR, Perry County, AR, Phillips County, AR, Poinsett County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Searcy County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Benton County, MO, Camden County, MO, Carter County, MO, Christian County, MO, Dallas County, MO, Douglas County, MO, Greene County, MO, Hickory County, MO, Howell County, MO, Laclede County, MO, Oregon County, MO, Ozark County, MO, Ripley County, MO, Shannon County, MO, Taney County, MO, Texas County, MO, Webster County, MO, Wright County, MO, Coahoma County, MS, DeSoto County, MS, Quitman County, MS, Tate County, MS, Tunica County, MS, Shelby County, TN, Tipton County, TN

The radar

The Little Rock radar (KLZK), 76 km from the middle of the area, began a volume at 22:56 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 10.9 hours before the alert went out and 180 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, Little Rock, AR at 12:00Z on 2003-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 29 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, Little Rock, AR at 12:00Z on 2003-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 300 square meters per square second.19395878Sfc1 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
29 J/kg
Mixed-layer CIN
-291 J/kg
Mixed-layer LCL
788 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
300 m²/s²
0-3 km storm-relative helicity
346 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

Open this sounding in Storm Lab

The text

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

194 
ACUS11 KWNS 242253
SWOMCD
SPC MCD 242252 
TNZ000-MSZ000-MOZ000-ARZ000-250045-

MESOSCALE DISCUSSION 0567
NWS STORM PREDICTION CENTER NORMAN OK
0552 PM CDT THU APR 24 2003

AREAS AFFECTED...CENTRAL AND NRN AR / SWRN MO / EXTREME SWRN TN /
NWRN MS

CONCERNING...TORNADO WATCH 156...159...

VALID 242252Z - 250045Z

SEVERE THREAT APPEARS TO BE INCREASING ACROSS WW AHEAD OF
APPROACHING UPPER LOW...AND NOW APPEARS TO EXTEND N OF WATCH INTO
SWRN MO.  NEW TORNADO WATCH REPLACING WWS 156 AND 159 WILL LIKELY BE
REQUIRED WHICH WOULD EXTEND NWD INTO SRN MO.

LATEST SURFACE ANALYSIS SHOWS NW TO SE-ORIENTED WARM FRONT EXTENDING
FROM EXTREME SWRN MO INTO SERN AR / SWRN MS...WHILE AREA OF
EXTENSIVE LOW CLOUDINESS PERSISTS ACROSS SERN MO.  ALTHOUGH AIRMASS
BECOMES INCREASINGLY STABLE WITH EWD EXTENT ACROSS THIS LOW CLOUD
SHIELD...MODERATE INSTABILITY EXISTS ACROSS SWRN MO INTO MUCH OF
AR...WHERE MEAN-LAYER CAPE AVERAGES 1500 TO 2500 J/KG.	 

LATEST WV LOOP SHOWS UPPER LOW / VORT MAX NOW OVER SERN KS / NERN
OK...WITH INCREASING LARGE-SCALE ASCENT EVIDENT ACROSS AR / MO.  
THUNDERSTORM DEVELOPMENT IS OCCURRING ACROSS NWRN AR / SWRN MO
ATTM...AS WELL AS ACROSS CENTRAL AND NERN AR.  GIVEN FAVORABLY
STRONG / VEERING WIND FIELD WITHIN THE MODERATELY-UNSTABLE
ENVIRONMENT...EXPECT THE TORNADO THREAT TO INCREASE ALONG WITH
DAMAGING WINDS AND LARGE HAIL.	STORMS MAY REMAIN SEVERE AS FAR E AS
SWRN TN / NWRN MS...ALTHOUGH MORE STABLE LOW-LEVEL AIRMASS FURTHER N
ACROSS SWRN MO SUGGESTS THAT THE PRIMARY SEVERE THREAT IN THIS
REGION SHOULD REMAIN LARGE HAIL.

..GOSS.. 04/24/2003

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

ATTN...WFO...PAH...MEG...JAN...LSX...LZK...SGF...TSA...

33779203 34189293 36579343 38319330 37259103 35418945
33979024

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 23, 11:43 PM CDTMesoscale DiscussionSPCHoward, Lafayette, Little River, Miller, Polk, Sevier2 hr
Apr 24, 2:41 AM CDTMesoscale DiscussionSPCColumbia, Lafayette, Miller, Nevada, Ouachita2 hr
Apr 24, 10:12 AM CDTMesoscale DiscussionSPCArkansas, Cleburne, Conway, Craighead, Crittenden, Cross and 20 more2 hr
Apr 24, 12:47 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 38 more3 hr
Apr 24, 1:00 PM CDTTornado WatchSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 25 more7 hr
Apr 24, 2:05 PM CDTTornado WatchSPCAshley, Chicot6 hr
Apr 24, 2:46 PM CDTMesoscale DiscussionSPCChicot119 min
Apr 24, 3:25 PM CDTTornado WatchSPCBaxter, Boone, Cleburne, Conway, Faulkner, Fulton and 19 more5 hr
Apr 24, 3:28 PM CDTMesoscale DiscussionSPCArkansas, Clark, Cleburne, Cleveland, Conway, Craighead and 32 more2 hr
Apr 24, 6:35 PM CDTTornado WatchSPCArkansas, Baxter, Clay, Cleburne, Cleveland, Conway and 33 more5 hr
Apr 24, 6:49 PM CDTMesoscale DiscussionSPCChicot56 min
Apr 24, 6:30 AM CDTSevere Thunderstorm WatchSPCAdams, Claiborne, Franklin, Issaquena, Jefferson, Sharkey and 2 more5 hr
Apr 24, 6:40 AM CDTSevere Thunderstorm WatchSPCAdams, Claiborne, Franklin, Issaquena, Jefferson, Sharkey and 2 more4 hr
Apr 24, 9:39 AM CDTMesoscale DiscussionSPCAdams, Amite, Attala, Chickasaw, Choctaw, Claiborne and 31 more2 hr
Apr 24, 11:40 AM CDTMesoscale DiscussionSPCAdams65 min
Apr 24, 5:17 PM CDTMesoscale DiscussionSPCForrest, George, Greene, Hancock, Harrison, Jackson and 5 more118 min
Apr 24, 12:03 PM CDTMesoscale DiscussionSPCBarry, Bates, Benton, Camden, Cass, Cedar and 19 more2 hr
Apr 24, 2:35 PM CDTSevere Thunderstorm WatchSPCBates, Benton, Cass, Cooper, Henry, Jackson and 5 more5 hr
Apr 24, 3:27 PM CDTMesoscale DiscussionSPCBates, Carroll, Cass, Chariton, Clay, Cooper and 8 more2 hr
Apr 24, 5:51 PM CDTMesoscale DiscussionSPCBates, Benton, Carroll, Cass, Chariton, Clay and 9 more54 min

Nearby

Mesoscale Discussions in Arkansas, 2003Mesoscale Discussions in Missouri, 2003Mesoscale Discussions in Mississippi, 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.