Alert archive / Mississippi / Mesoscale Discussions in 2010

Mesoscale Discussion 461

May 2, 201011 counties in Arkansas; 26 parishes in Louisiana; 37 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 2, 2010, 6:55 AM CDT for 11 counties in Arkansas; 26 parishes in Louisiana; 37 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 2, 2010, 6:55 AM CDT (11:55 UTC)
Expired
May 2, 2010, 9:00 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 74 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleveland County, AR, Desha County, AR, Drew County, AR, Lincoln County, AR, Phillips County, AR, Union County, AR, Avoyelles Parish, LA, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Richland Parish, LA, Saint Helena Parish, LA, Tensas Parish, LA, Union Parish, LA, Washington Parish, LA, West Carroll Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Attala County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Warren County, MS, Washington County, MS, Wilkinson County, MS, Winston County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 120 km from the middle of the area, began a volume at 11:57 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

Jackson, MS (KJAN), launched 00:00Z, 11.9 hours before the alert went out and 112 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, Jackson, MS at 00:00Z on 2010-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2510 joules per kilogram.LCLEL10008507005003002001001 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, Jackson, MS at 00:00Z on 2010-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 283 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
2510 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
460 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
283 m²/s²
0-3 km storm-relative helicity
307 m²/s²
Significant tornado parameter
4.8
Supercell composite
16.6

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, 7:11 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 51 more64 min
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, 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 Mississippi, 2010Mesoscale Discussions in Louisiana, 2010Mesoscale Discussions in Arkansas, 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.