Alert archive / Arkansas / Mesoscale Discussions in 2005

Mesoscale Discussion 500

April 6, 200536 counties in Arkansas; 26 parishes in Louisiana; Bolivar County, Issaquena County, Washington County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2005, 7:46 AM CDT for 36 counties in Arkansas; 26 parishes in Louisiana; Bolivar County, Issaquena County, Washington County, Mississippi. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
Apr 6, 2005, 7:46 AM CDT (12:46 UTC)
Expired
Apr 6, 2005, 9:45 AM CDT
In force
119 min
Issued by
the Storm Prediction Center
All 65 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Conway 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, Jefferson County, AR, Lafayette County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Miller County, AR, Monroe County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, St. Francis County, AR, Union County, AR, White County, AR, Woodruff County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, East Carroll 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, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Union Parish, LA, Vernon Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Bolivar County, MS, Issaquena County, MS, Washington County, MS

The radar

The Little Rock radar (KLZK), 145 km from the middle of the area, began a volume at 12:46 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 12:00Z, 0.8 hours before the alert went out and 245 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 12:00Z on 2005-04-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 268 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 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 12:00Z on 2005-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 278 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
268 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
618 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
278 m²/s²
0-3 km storm-relative helicity
332 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.7

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 5, 8:25 PM CDTSevere Thunderstorm WatchSPCColumbia, Hempstead, Lafayette, Little River, Miller, Nevada and 1 more8 hr
Apr 5, 8:30 PM CDTSevere Thunderstorm WatchSPCBaxter, Benton, Boone, Carroll, Clark, Conway and 27 more5 hr
Apr 5, 10:40 PM CDTMesoscale DiscussionSPCAshley, Bradley, Union2 hr
Apr 5, 11:41 PM CDTMesoscale DiscussionSPCArkansas, Baxter, Calhoun, Cleburne, Cleveland, Conway and 31 more34 min
Apr 6, 10:40 AM CDTMesoscale DiscussionSPCAshley, Chicot, Desha, Drew65 min
Apr 6, 12:46 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 17 more119 min
Apr 6, 1:55 PM CDTTornado WatchSPCBaxter, Clay, Cleburne, Craighead, Crittenden, Cross and 19 more7 hr
Apr 6, 3:18 PM CDTMesoscale DiscussionSPCBaxter, Clay, Cleburne, Craighead, Crittenden, Cross and 19 more87 min
Apr 6, 5:44 PM CDTMesoscale DiscussionSPCArkansas, Baxter, Clay, Cleburne, Craighead, Crittenden and 20 more91 min
Apr 6, 2:55 AM CDTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 36 more7 hr
Apr 6, 5:45 AM CDTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 36 more90 min
Apr 6, 7:00 AM CDTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Cameron and 27 more6 hr
Apr 6, 9:29 AM CDTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Cameron and 27 more2 hr
Apr 6, 11:05 AM CDTTornado WatchSPCAscension, Assumption, Concordia, East Baton Rouge, East Carroll, East Feliciana and 22 more8 hr
Apr 6, 1:21 PM CDTMesoscale DiscussionSPCAscension, Assumption, Concordia, East Baton Rouge, East Carroll, East Feliciana and 22 more84 min
Apr 6, 3:43 PM CDTMesoscale DiscussionSPCAscension, Assumption, Concordia, East Baton Rouge, East Carroll, East Feliciana and 22 more92 min
Apr 6, 6:01 PM CDTMesoscale DiscussionSPCOrleans, Saint Bernard, Saint Tammany, Washington59 min
Apr 6, 6:45 PM CDTTornado WatchSPCWashington6 hr
Apr 6, 11:05 AM CDTTornado WatchSPCGeorge, Greene, Harrison, Jackson, Wayne8 hr
Apr 6, 4:53 PM CDTMesoscale DiscussionSPCAlcorn, Tishomingo37 min

Nearby

Mesoscale Discussions in Arkansas, 2005Mesoscale Discussions in Louisiana, 2005Mesoscale Discussions in Mississippi, 2005Every mesoscale discussion in 2005

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.