Alert archive / Mississippi / Mesoscale Discussions in 2006

Mesoscale Discussion 588

April 20, 200610 counties in Arkansas; 39 counties in Mississippi; 9 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 20, 2006, 4:15 PM CDT for 10 counties in Arkansas; 39 counties in Mississippi; 9 counties in Tennessee. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 20, 2006, 4:15 PM CDT (21:15 UTC)
Expired
Apr 20, 2006, 6:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 58 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Chicot County, AR, Cleveland County, AR, Desha County, AR, Drew County, AR, Jefferson County, AR, Lincoln County, AR, Phillips County, AR, Alcorn County, MS, Attala County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Lowndes County, MS, Marshall County, MS, Monroe County, MS, Montgomery County, MS, Noxubee County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Chester County, TN, Crockett County, TN, Fayette County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Madison County, TN, McNairy County, TN, Shelby County, TN

The radar

The Memphis radar (KNQA), 101 km from the middle of the area, began a volume at 21:16 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, 9.3 hours before the alert went out and 47 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 2006-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2006-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -159 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
950 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
-159 m²/s²
0-3 km storm-relative helicity
-33 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 19, 7:41 PM CDTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Chicot, Columbia, Drew and 4 more94 min
Apr 19, 9:23 PM CDTSevere Thunderstorm WatchSPCCalhoun, Clark, Columbia, Dallas, Hempstead, Howard and 8 more5 hr
Apr 20, 1:49 AM CDTSevere Thunderstorm WatchSPCArkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 42 more7 hr
Apr 20, 6:06 AM CDTMesoscale DiscussionSPCClark, Cleveland, Dallas, Garland, Grant, Hot Spring and 7 more114 min
Apr 20, 2:15 PM CDTSevere Thunderstorm WatchSPCArkansas, Ashley, Chicot, Desha, Drew, Lincoln and 1 more7 hr
Apr 20, 11:19 AM CDTMesoscale DiscussionSPCAttala, Calhoun, Carroll, Chickasaw, Choctaw, Clay and 21 more86 min
Apr 20, 1:38 PM CDTMesoscale DiscussionSPCAlcorn, Attala, Bolivar, Calhoun, Carroll, Chickasaw and 27 more2 hr
Apr 20, 6:11 PM CDTMesoscale DiscussionSPCLowndes2 hr
Apr 20, 4:22 AM CDTMesoscale DiscussionSPCBenton, Carroll, Cheatham, Chester, Crockett, Davidson and 27 more113 min
Apr 20, 11:24 AM CDTMesoscale DiscussionSPCAnderson, Blount, Campbell, Carter, Claiborne, Cocke and 19 more2 hr
Apr 20, 11:38 AM CDTSevere Thunderstorm WatchSPCBedford, Bledsoe, Bradley, Cannon, Coffee, Franklin and 18 more7 hr
Apr 20, 3:40 PM CDTMesoscale DiscussionSPCFranklin, Giles, Grundy, Hamilton, Lawrence, Lincoln and 5 more2 hr

Nearby

Mesoscale Discussions in Mississippi, 2006Mesoscale Discussions in Arkansas, 2006Mesoscale Discussions in Tennessee, 2006Every mesoscale discussion in 2006

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.