Alert archive / Arkansas / Mesoscale Discussions in 2004

Mesoscale Discussion 469

April 24, 200424 counties in Arkansas; Dunklin County, Oregon County, Pemiscot County, Missouri

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2004, 3:23 PM CDT for 24 counties in Arkansas; Dunklin County, Oregon County, Pemiscot County, Missouri. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Apr 24, 2004, 3:23 PM CDT (20:23 UTC)
Expired
Apr 24, 2004, 4:30 PM CDT
In force
67 min
Issued by
the Storm Prediction Center
All 27 counties

Arkansas County, AR, Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Desha County, AR, Drew County, AR, Greene County, AR, Independence County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Mississippi County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Randolph County, AR, Sharp County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Dunklin County, MO, Oregon County, MO, Pemiscot County, MO

The radar

The Little Rock radar (KLZK), 90 km from the middle of the area, began a volume at 20:24 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, 8.4 hours before the alert went out and 124 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 2004-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 535 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 2004-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 255 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
535 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
671 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
255 m²/s²
0-3 km storm-relative helicity
243 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.0

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
Apr 23, 7:05 PM CDTMesoscale DiscussionSPCBenton, Carroll, Crawford, Franklin, Logan, Madison and 3 more25 min
Apr 23, 7:35 PM CDTSevere Thunderstorm WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Scott and 2 more6 hr
Apr 23, 9:43 PM CDTMesoscale DiscussionSPCBenton, Carroll, Crawford, Franklin, Madison, Scott and 2 more62 min
Apr 23, 11:33 PM CDTMesoscale DiscussionSPCBenton, Carroll, Crawford, Franklin, Madison, Scott and 2 more57 min
Apr 24, 1:40 AM CDTSevere Thunderstorm WatchSPCArkansas, Clark, Cleburne, Cleveland, Conway, Crawford and 31 more4 hr
Apr 24, 4:16 AM CDTMesoscale DiscussionSPCArkansas, Clark, Cleveland, Conway, Dallas, Desha and 24 more59 min
Apr 24, 11:50 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clay and 36 more55 min
Apr 24, 12:10 PM CDTTornado WatchSPCArkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 35 more8 hr
Apr 24, 12:35 PM CDTSevere Thunderstorm WatchSPCAshley, Chicot, Columbia, Union6 hr
Apr 24, 5:04 PM CDTMesoscale DiscussionSPCChicot26 min
Apr 24, 5:08 PM CDTMesoscale DiscussionSPCClay, Craighead, Greene, Jackson, Lawrence, Mississippi and 2 more2 hr
Apr 24, 6:40 PM CDTTornado WatchSPCClay, Mississippi5 hr
Apr 24, 4:22 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Cass, Clay, Clinton and 4 more113 min

Nearby

Mesoscale Discussions in Arkansas, 2004Mesoscale Discussions in Missouri, 2004Every mesoscale discussion in 2004

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.