Alert archive / Arkansas / Mesoscale Discussions in 2003

Mesoscale Discussion 766

May 5, 20034 states

The Storm Prediction Center issued this mesoscale discussion at May 5, 2003, 1:13 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 5, 2003, 1:13 PM CDT (18:13 UTC)
Expired
May 5, 2003, 3:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 40 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Drew County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Sevier County, AR, Union County, AR, Claiborne Parish, LA, McCurtain County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Delta County, TX, Franklin County, TX, Gregg County, TX, Hopkins County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Rains County, TX, Red River County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 120 km from the middle of the area, began a volume at 18:15 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 watches that followed

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

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 6.2 hours before the alert went out and 119 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 2003-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3415 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 2003-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 298 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
3415 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
619 m above ground
0-6 km bulk shear
65 kt
0-1 km storm-relative helicity
298 m²/s²
0-3 km storm-relative helicity
264 m²/s²
Significant tornado parameter
5.2
Supercell composite
18.9

Open this sounding in Storm Lab

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 4, 7:19 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 21 more86 min
May 4, 7:34 PM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Jackson and 7 more116 min
May 4, 9:26 PM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Jackson and 7 more2 hr
May 4, 9:42 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 29 more93 min
May 5, 12:50 AM CDTTornado WatchSPCBaxter, Benton, Boone, Carroll, Clark, Cleburne and 34 more5 hr
May 5, 1:20 AM CDTTornado WatchSPCArkansas, Clay, Craighead, Crittenden, Cross, Greene and 7 more6 hr
May 5, 4:18 AM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Independence and 14 more57 min
May 5, 4:55 AM CDTTornado WatchSPCClay, Craighead, Crittenden, Cross, Greene, Jackson and 9 more6 hr
May 5, 7:11 AM CDTMesoscale DiscussionSPCCrittenden, Cross, Lee, Mississippi, St. Francis2 hr
May 5, 9:56 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 33 more2 hr
May 5, 10:38 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 19 more3 hr
May 5, 10:40 AM CDTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 21 more5 hr
May 5, 1:05 PM CDTTornado WatchSPCCleburne, Conway, Craighead, Crawford, Crittenden, Cross and 21 more3 hr
May 5, 3:25 PM CDTTornado WatchSPCArkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 62 more7 hr
May 5, 5:18 PM CDTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Clark, Cleveland, Columbia and 24 more117 min
May 5, 5:40 PM CDTMesoscale DiscussionSPCAshley, Bradley, Chicot, Desha, Drew2 hr

Nearby

Mesoscale Discussions in Arkansas, 2003Mesoscale Discussions in Texas, 2003Mesoscale Discussions in Louisiana, 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.