Alert archive / Mississippi / Mesoscale Discussions in 2009

Mesoscale Discussion 376

April 2, 20095 states

The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2009, 5:36 PM CDT for 5 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Apr 2, 2009, 5:36 PM CDT (22:36 UTC)
Expired
Apr 2, 2009, 7:00 PM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 66 counties

Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Jackson County, AR, Lawrence County, AR, Lee County, AR, Mississippi County, AR, Phillips County, AR, Poinsett County, AR, St. Francis County, AR, Woodruff County, AR, Fulton County, KY, Hickman County, KY, Dunklin County, MO, New Madrid County, MO, Pemiscot County, MO, Alcorn County, MS, Attala County, MS, Benton 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, Lafayette County, MS, Lee County, MS, Leflore County, MS, Marshall County, MS, Montgomery 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, Tunica County, MS, Union County, MS, Webster County, MS, Yalobusha County, MS, Carroll County, TN, Chester County, TN, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Henderson County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 69 km from the middle of the area, began a volume at 22:37 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

Little Rock, AR (KLZK), launched 12:00Z, 10.6 hours before the alert went out and 13 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 2009-04-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 11 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, Little Rock, AR at 12:00Z on 2009-04-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 177 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
11 J/kg
Mixed-layer CIN
-193 J/kg
Mixed-layer LCL
630 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
177 m²/s²
0-3 km storm-relative helicity
176 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

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 2, 1:32 AM CDTMesoscale DiscussionSPCColumbia, Hempstead, Lafayette, Little River, Miller58 min
Apr 2, 4:43 AM CDTSevere Thunderstorm WatchSPCColumbia, Hempstead, Lafayette, Miller, Nevada, Union6 hr
Apr 2, 7:36 AM CDTMesoscale DiscussionSPCColumbia, Hempstead, Lafayette, Miller, Nevada, Ouachita and 1 more54 min
Apr 2, 8:01 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 24 more59 min
Apr 2, 9:24 AM CDTTornado WatchSPCAshley, Chicot7 hr
Apr 2, 12:50 PM CDTMesoscale DiscussionSPCConway, Crawford, Faulkner, Franklin, Garland, Grant and 12 more85 min
Apr 2, 3:36 PM CDTMesoscale DiscussionSPCArkansas, Chicot, Desha, Lee, Monroe, Phillips54 min
Apr 2, 3:56 PM CDTSevere Thunderstorm WatchSPCArkansas, Chicot, Cross, Desha, Drew, Jefferson and 9 more4 hr
Apr 2, 6:21 PM CDTTornado WatchSPCCrittenden, Mississippi3 hr
Apr 2, 2:04 PM CDTMesoscale DiscussionSPCAllen, Barren, Breckinridge, Bullitt, Butler, Caldwell and 30 more116 min
Apr 2, 2:40 PM CDTTornado WatchSPCAllen, Breckinridge, Butler, Caldwell, Calloway, Christian and 22 more4 hr
Apr 2, 4:35 PM CDTMesoscale DiscussionSPCAdair, Anderson, Barren, Bath, Boone, Bourbon and 64 more85 min
Apr 2, 5:27 PM CDTTornado WatchSPCAdair, Anderson, Barren, Boone, Bourbon, Boyle and 52 more3 hr
Apr 2, 6:29 AM CDTTornado WatchSPCGeorge, Greene, Perry, Stone, Wayne8 hr
Apr 2, 10:53 AM CDTTornado WatchSPCAlcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more4 hr
Apr 2, 11:51 AM CDTMesoscale DiscussionSPCAmite, Attala, Carroll, Choctaw, Claiborne, Clarke and 40 more84 min
Apr 2, 1:09 PM CDTMesoscale DiscussionSPCClarke, George, Greene, Harrison, Jackson, Kemper and 6 more66 min
Apr 2, 1:33 PM CDTTornado WatchSPCGeorge, Greene, Perry, Stone, Wayne5 hr
Apr 2, 3:42 PM CDTMesoscale DiscussionSPCBedford, Giles, Lawrence, Lewis, Lincoln, Marshall and 2 more63 min
Apr 2, 5:25 PM CDTMesoscale DiscussionSPCAnderson, Bledsoe, Blount, Bradley, Cumberland, Fentress and 20 more95 min
Apr 2, 6:02 PM CDTTornado WatchSPCAnderson, Bedford, Benton, Bledsoe, Bradley, Campbell and 52 more7 hr

Nearby

Mesoscale Discussions in Mississippi, 2009Mesoscale Discussions in Tennessee, 2009Mesoscale Discussions in Arkansas, 2009Every mesoscale discussion in 2009

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.