Alert archive / Arkansas / Mesoscale Discussions in 2010

Mesoscale Discussion 445

May 1, 201044 counties in Arkansas; 7 parishes in Louisiana

The Storm Prediction Center issued this mesoscale discussion at May 1, 2010, 1:37 PM CDT for 44 counties in Arkansas; 7 parishes in Louisiana. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
May 1, 2010, 1:37 PM CDT (18:37 UTC)
Expired
May 1, 2010, 2:30 PM CDT
In force
53 min
Issued by
the Storm Prediction Center
All 51 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, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lafayette County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Miller 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, Sharp County, AR, St. Francis County, AR, Stone County, AR, Union County, AR, White County, AR, Woodruff County, AR, Bossier Parish, LA, Claiborne Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Union Parish, LA, Webster Parish, LA

The radar

The Little Rock radar (KLZK), 96 km from the middle of the area, began a volume at 18:40 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 12:00Z, 6.6 hours before the alert went out and 206 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 12:00Z on 2010-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2117 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, Shreveport, LA at 12:00Z on 2010-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 185 square meters per square second.1939587897117Sfc1 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
2117 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
477 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
185 m²/s²
0-3 km storm-relative helicity
260 m²/s²
Significant tornado parameter
2.9
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
Apr 30, 7:26 PM CDTMesoscale DiscussionSPCBaxter, Cleburne, Conway, Faulkner, Fulton, Garland and 15 more2 hr
Apr 30, 9:09 PM CDTTornado Watch PDSSPCArkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 49 more7 hr
Apr 30, 10:43 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 49 more62 min
Apr 30, 11:41 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 45 more64 min
May 1, 2:25 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 40 more95 min
May 1, 3:11 AM CDTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 24 more8 hr
May 1, 6:17 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 9 more88 min
May 1, 7:48 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 22 more57 min
May 1, 9:52 AM CDTTornado WatchSPCAshley, Chicot8 hr
May 1, 11:19 AM CDTMesoscale DiscussionSPCCrittenden56 min
May 1, 3:11 PM CDTMesoscale DiscussionSPCBenton94 min
May 1, 3:18 PM CDTTornado Watch PDSSPCArkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 43 more7 hr
May 1, 5:43 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Clark, Cleveland and 31 more62 min

Nearby

Mesoscale Discussions in Arkansas, 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.