Alert archive / Arkansas / Mesoscale Discussions in 2011
Mesoscale Discussion 575
The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2011, 4:34 PM CDT for 7 states. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Apr 25, 2011, 4:34 PM CDT (21:34 UTC)
- Expired
- Apr 25, 2011, 5:30 PM CDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
All 90 counties
Arkansas County, AR, 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, Monroe County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Randolph County, AR, St. Francis County, AR, Woodruff County, AR, Alexander County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, White County, IL, Williamson County, IL, Posey County, IN, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Union County, KY, Webster County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Dunklin County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Perry County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO, Benton County, MS, Coahoma County, MS, DeSoto County, MS, Lafayette County, MS, Marshall County, MS, Panola County, MS, Pontotoc County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Union 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, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN
The radar
The Memphis radar (KNQA), 88 km from the middle of the area, began a volume at 21:35 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, 9.6 hours before the alert went out and 146 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.
- Mixed-layer CAPE
- 11 J/kg
- Mixed-layer CIN
- -189 J/kg
- Mixed-layer LCL
- 729 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 210 m²/s²
- 0-3 km storm-relative helicity
- 321 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.8
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 10:13 PM CDT | Mesoscale Discussion | SPC | Clark, Cleburne, Conway, Faulkner, Garland, Grant and 15 more | 2 hr |
| Apr 24, 11:43 PM CDT | Severe Thunderstorm Watch | SPC | Hempstead, Howard, Little River, Miller, Nevada, Sevier | 5 hr |
| Apr 25, 1:57 AM CDT | Mesoscale Discussion | SPC | Cleveland, Dallas, Jefferson, Lincoln | 63 min |
| Apr 25, 4:41 AM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 25 more | 7 hr |
| Apr 25, 7:23 AM CDT | Mesoscale Discussion | SPC | Calhoun, Clark, Cleveland, Columbia, Dallas, Garland and 11 more | 97 min |
| Apr 25, 8:37 AM CDT | Mesoscale Discussion | SPC | Arkansas, Cleveland, Crittenden, Desha, Drew, Jefferson and 7 more | 53 min |
| Apr 25, 9:17 AM CDT | Severe Thunderstorm Watch | SPC | Crittenden, Lee, Phillips, St. Francis | 6 hr |
| Apr 25, 10:46 AM CDT | Mesoscale Discussion | SPC | Hempstead, Howard, Lafayette, Little River, Miller, Sevier | 59 min |
| Apr 25, 11:00 AM CDT | Tornado Watch | SPC | Carroll, Clark, Crawford, Franklin, Hempstead, Howard and 13 more | 7 hr |
| Apr 25, 1:15 PM CDT | Mesoscale Discussion | SPC | Crittenden, Cross, Lee, Phillips, St. Francis | 60 min |
| Apr 25, 1:28 PM CDT | Mesoscale Discussion | SPC | Crawford, Franklin, Howard, Johnson, Little River, Logan and 5 more | 92 min |
| Apr 25, 3:08 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 29 more | 37 min |
| Apr 25, 3:22 PM CDT | Tornado Watch | SPC | Arkansas, Baxter, Boone, Bradley, Calhoun, Clark and 50 more | 8 hr |
| Apr 25, 4:50 PM CDT | Tornado Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more | 7 hr |
| Apr 25, 2:29 PM CDT | Severe Thunderstorm Watch | SPC | Allen, Barren, Butler, Christian, Edmonson, Grayson and 7 more | 4 hr |
| Apr 25, 1:48 PM CDT | Mesoscale Discussion | SPC | Bedford, Benton, Carroll, Cheatham, Davidson, Decatur and 20 more | 87 min |
Nearby
Mesoscale Discussions in Arkansas, 2011Mesoscale Discussions in Tennessee, 2011Mesoscale Discussions in Illinois, 2011Every mesoscale discussion in 2011
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.