Alert archive / Arkansas / Mesoscale Discussions in 2010

Mesoscale Discussion 451

May 1, 20104 states

The Storm Prediction Center issued this mesoscale discussion at May 1, 2010, 7:11 PM CDT for 4 states. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
May 1, 2010, 7:11 PM CDT (00:11 UTC)
Expired
May 1, 2010, 8:15 PM CDT
In force
64 min
Issued by
the Storm Prediction Center
All 88 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Independence County, AR, Jackson County, AR, Jefferson County, AR, Johnson County, AR, Lafayette County, AR, Lee County, AR, Lincoln County, AR, Little River County, AR, Logan County, AR, Lonoke County, AR, Miller County, AR, Mississippi County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Poinsett County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sevier County, AR, St. Francis County, AR, Stone County, AR, Union County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Union Parish, LA, Webster Parish, LA, Bolivar County, MS, Coahoma County, MS, Tunica County, MS, Angelina County, TX, Bowie County, TX, Cass County, TX, Cherokee County, TX, Gregg County, TX, Harrison County, TX, Houston County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, San Augustine County, TX, Shelby County, TX, Trinity County, TX, Upshur County, TX

The radar

The Little Rock radar (KLZK), 125 km from the middle of the area, began a volume at 00:12 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 00:00Z, 0.2 hours before the alert went out and 173 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 00:00Z on 2010-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2524 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 00:00Z on 2010-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 207 square meters per square second.1939587897117136Sfc1 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
2524 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
952 m above ground
0-6 km bulk shear
68 kt
0-1 km storm-relative helicity
207 m²/s²
0-3 km storm-relative helicity
228 m²/s²
Significant tornado parameter
2.7
Supercell composite
11.3

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 1, 7:30 PM CDTMesoscale DiscussionSPCCraighead, Crittenden, Cross, Greene, Lawrence, Lee and 4 more30 min
May 1, 8:06 PM CDTTornado Watch PDSSPCClay, Craighead, Crittenden, Cross, Greene, Lawrence and 6 more8 hr
May 1, 8:31 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 35 more44 min
May 1, 9:53 PM CDTTornado WatchSPCArkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 29 more6 hr
May 1, 11:38 PM CDTMesoscale DiscussionSPCArkansas, Clay, Cleburne, Conway, Craighead, Crittenden and 24 more67 min
May 2, 2:33 AM CDTMesoscale DiscussionSPCArkansas, Bradley, Chicot, Clay, Cleveland, Craighead and 16 more87 min
May 2, 6:55 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 5 more2 hr
May 2, 8:01 AM CDTTornado WatchSPCAscension, Assumption, East Carroll, East Feliciana, Jefferson, Lafourche and 13 more7 hr
May 1, 9:19 PM CDTMesoscale DiscussionSPCAttala, Carroll, Chickasaw, Choctaw, Clay, Itawamba and 14 more56 min
May 2, 3:36 AM CDTTornado Watch PDSSPCAlcorn, Benton, Bolivar, Calhoun, Carroll, Chickasaw and 27 more8 hr
May 2, 6:37 AM CDTMesoscale DiscussionSPCAlcorn, Benton, Calhoun, Carroll, Chickasaw, Choctaw and 24 more113 min
May 2, 11:15 AM CDTMesoscale DiscussionSPCAlcorn, Chickasaw, Clay, Itawamba, Lee, Monroe and 6 more60 min
May 2, 2:28 PM CDTMesoscale DiscussionSPCLowndes62 min
May 2, 6:29 PM CDTMesoscale DiscussionSPCKemper, Lauderdale, Leake, Lowndes, Monroe, Neshoba and 3 more61 min

Nearby

Mesoscale Discussions in Arkansas, 2010Mesoscale Discussions in Texas, 2010Mesoscale Discussions in Louisiana, 2010Every mesoscale discussion in 2010

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.