Alert archive / Arkansas / Mesoscale Discussions in 2008

Mesoscale Discussion 771

May 2, 200829 counties in Arkansas; Dunklin County, Pemiscot County, Missouri; Lauderdale County, Tipton County, Tennessee

The Storm Prediction Center issued this mesoscale discussion at May 2, 2008, 10:20 AM CDT for 29 counties in Arkansas; Dunklin County, Pemiscot County, Missouri; Lauderdale County, Tipton County, Tennessee. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
May 2, 2008, 10:20 AM CDT (15:20 UTC)
Expired
May 2, 2008, 11:45 AM CDT
In force
85 min
Issued by
the Storm Prediction Center
All 33 counties

Arkansas County, AR, Calhoun County, AR, Clark County, AR, Clay County, AR, Cleveland County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Grant County, AR, Greene County, AR, Hot Spring County, AR, Jackson County, AR, Jefferson County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Nevada County, AR, Ouachita County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Dunklin County, MO, Pemiscot County, MO, Lauderdale County, TN, Tipton County, TN

The radar

The Little Rock radar (KLZK), 74 km from the middle of the area, began a volume at 15:23 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, 3.3 hours before the alert went out and 142 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 2008-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1314 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 2008-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 532 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
1314 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
609 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
532 m²/s²
0-3 km storm-relative helicity
505 m²/s²
Significant tornado parameter
3.8
Supercell composite
15.3

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 2, 1:09 AM CDTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more7 hr
May 2, 4:22 AM CDTMesoscale DiscussionSPCBoone, Carroll, Crawford, Franklin, Johnson, Logan and 6 more53 min
May 2, 5:00 AM CDTSevere Thunderstorm WatchSPCBaxter, Boone, Clark, Cleburne, Conway, Faulkner and 25 more5 hr
May 2, 7:07 AM CDTMesoscale DiscussionSPCCleburne, Conway, Faulkner, Fulton, Hot Spring, Izard and 5 more53 min
May 2, 8:49 AM CDTTornado WatchSPCArkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 43 more6 hr
May 2, 12:12 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 18 more2 hr
May 2, 1:54 PM CDTTornado WatchSPCArkansas, Ashley, Bradley, Chicot, Crittenden, Cross and 8 more6 hr
May 2, 3:35 PM CDTMesoscale DiscussionSPCArkansas, Crittenden, Cross, Desha, Drew, Lee and 4 more85 min
May 2, 5:18 PM CDTTornado WatchSPCColumbia, Union6 hr
May 1, 7:24 PM CDTMesoscale DiscussionSPCAndrew, Bates, Buchanan, Caldwell, Cass, Clay and 12 more66 min
May 1, 10:04 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Barton, Bates, Buchanan, Caldwell and 34 more116 min
May 1, 11:29 PM CDTMesoscale DiscussionSPCAdair, Andrew, Audrain, Barton, Bates, Benton and 59 more91 min
May 2, 12:53 AM CDTTornado WatchSPCAdair, Andrew, Barry, Barton, Bates, Benton and 46 more6 hr
May 2, 10:44 AM CDTTornado WatchSPCMississippi, New Madrid, Scott, Stoddard9 hr
May 2, 4:43 PM CDTTornado WatchSPCBedford, Benton, Cannon, Cheatham, Clay, Coffee and 27 more7 hr

Nearby

Mesoscale Discussions in Arkansas, 2008Mesoscale Discussions in Missouri, 2008Mesoscale Discussions in Tennessee, 2008Every mesoscale discussion in 2008

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.