Alert archive / Arkansas / Mesoscale Discussions in 2008

Mesoscale Discussion 620

April 10, 20087 states

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2008, 10:51 AM CDT for 7 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Apr 10, 2008, 10:51 AM CDT (15:51 UTC)
Expired
Apr 10, 2008, 12:15 PM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 62 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Clay County, AR, Cleveland County, AR, Columbia County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Greene County, AR, Independence County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Ouachita County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, St. Francis County, AR, Union County, AR, White County, AR, Woodruff County, AR, Alexander County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Union County, IL, Ballard County, KY, Carlisle County, KY, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Red River Parish, LA, Union Parish, LA, Webster Parish, LA, Butler County, MO, Cape Girardeau County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Scott County, MO, Stoddard County, MO, Lake County, TN, Shelby County, TX

The radar

The Little Rock radar (KLZK), 61 km from the middle of the area, began a volume at 15:53 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

Little Rock, AR (KLZK), launched 12:00Z, 3.9 hours before the alert went out and 162 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 2008-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 328 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 2008-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 696 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
328 J/kg
Mixed-layer CIN
-45 J/kg
Mixed-layer LCL
566 m above ground
0-6 km bulk shear
73 kt
0-1 km storm-relative helicity
696 m²/s²
0-3 km storm-relative helicity
979 m²/s²
Significant tornado parameter
2.1
Supercell composite
11.4

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 9, 7:28 PM CDTMesoscale DiscussionSPCCrawford, Franklin, Hempstead, Howard, Johnson, Little River and 8 more62 min
Apr 9, 8:10 PM CDTTornado WatchSPCHempstead, Howard, Johnson, Little River, Logan, Montgomery and 6 more6 hr
Apr 9, 10:40 PM CDTTornado WatchSPCCrawford, Franklin, Sebastian7 hr
Apr 10, 1:45 AM CDTTornado WatchSPCBaxter, Boone, Cleburne, Conway, Faulkner, Fulton and 16 more8 hr
Apr 10, 3:00 AM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Mississippi and 1 more60 min
Apr 10, 3:28 AM CDTTornado WatchSPCClay, Craighead, Crittenden, Cross, Greene, Lawrence and 4 more7 hr
Apr 10, 3:54 AM CDTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Hempstead, Howard and 10 more8 hr
Apr 10, 5:55 AM CDTMesoscale DiscussionSPCCrawford, Franklin, Howard, Johnson, Little River, Logan and 4 more65 min
Apr 10, 8:32 AM CDTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Clark, Cleveland, Columbia and 22 more58 min
Apr 10, 8:42 AM CDTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 19 more7 hr
Apr 10, 9:27 AM CDTMesoscale DiscussionSPCClay, Cleburne, Conway, Craighead, Crittenden, Cross and 16 more2 hr
Apr 10, 9:51 AM CDTTornado WatchSPCClay, Cleburne, Conway, Craighead, Crittenden, Cross and 19 more7 hr
Apr 10, 1:41 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Clay, Cleveland and 20 more2 hr
Apr 10, 11:16 AM CDTMesoscale DiscussionSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 25 more2 hr
Apr 10, 4:55 PM CDTTornado WatchSPCAdams, Brown, Calhoun, Hancock, Henderson, McDonough and 3 more5 hr
Apr 10, 5:03 PM CDTTornado WatchSPCEdwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 12 more6 hr
Apr 10, 6:44 PM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Hancock, Henderson, McDonough and 5 more61 min
Apr 10, 6:56 AM CDTMesoscale DiscussionSPCChristian, Douglas, Greene, Howell, Laclede, Maries and 9 more64 min
Apr 10, 7:44 AM CDTTornado WatchSPCDent, Douglas, Howell, Oregon, Ozark, Shannon and 2 more2 hr
Apr 10, 2:03 PM CDTMesoscale DiscussionSPCAndrew, Barton, Bates, Benton, Buchanan, Caldwell and 21 more117 min
Apr 10, 2:28 PM CDTSevere Thunderstorm WatchSPCAdair, Andrew, Atchison, Barton, Bates, Benton and 51 more7 hr
Apr 9, 7:44 PM CDTTornado WatchSPCBorden, Brown, Callahan, Coke, Coleman, Concho and 34 more8 hr
Apr 9, 8:13 PM CDTMesoscale DiscussionSPCAnderson, Bosque, Collin, Cooke, Dallas, Delta and 26 more62 min
Apr 9, 10:01 PM CDTMesoscale DiscussionSPCArcher, Clay, Collin, Cooke, Delta, Denton and 8 more59 min
Apr 9, 11:22 PM CDTMesoscale DiscussionSPCBaylor, Childress, Collingsworth, Cottle, Dickens, Foard and 8 more53 min
Apr 9, 11:46 PM CDTMesoscale DiscussionSPCAndrews, Borden, Brown, Callahan, Coke, Coleman and 35 more59 min
Apr 10, 1:36 AM CDTMesoscale DiscussionSPCArcher, Brown, Callahan, Clay, Coleman, Comanche and 19 more54 min
Apr 10, 3:30 AM CDTMesoscale DiscussionSPCAnderson, Bell, Camp, Collin, Dallas, Delta and 26 more60 min

Nearby

Mesoscale Discussions in Arkansas, 2008Mesoscale Discussions in Louisiana, 2008Mesoscale Discussions in Missouri, 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.