Alert archive / Arkansas / Mesoscale Discussions in 2009
Mesoscale Discussion 526
The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2009, 2:22 PM CDT for 6 states. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- Apr 19, 2009, 2:22 PM CDT (19:22 UTC)
- Expired
- Apr 19, 2009, 3:15 PM CDT
- In force
- 53 min
- Issued by
- the Storm Prediction Center
All 89 counties
Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Clay County, AR, Cleveland County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Greene County, AR, Independence County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Sharp County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Alexander County, IL, Fulton County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Dunklin County, MO, New Madrid County, MO, Oregon County, MO, Pemiscot County, MO, Reynolds County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO, Alcorn County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Chickasaw County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Union County, MS, Yalobusha County, MS, Benton County, TN, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Shelby County, TN, Stewart County, TN, Tipton County, TN, Weakley County, TN
The radar
The Memphis radar (KNQA), 68 km from the middle of the area, began a volume at 19:21 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, 7.4 hours before the alert went out and 68 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
- 774 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 451 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 1.6
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 18, 8:14 PM CDT | Mesoscale Discussion | SPC | Benton, Crawford, Washington | 91 min |
| Apr 19, 12:14 PM CDT | Mesoscale Discussion | SPC | Arkansas, Baxter, Calhoun, Clay, Cleburne, Cleveland and 35 more | 61 min |
| Apr 19, 12:38 PM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Bradley, Calhoun, Clay, Cleburne, Cleveland and 26 more | 6 hr |
| Apr 19, 3:49 PM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 4 more | 56 min |
| Apr 19, 5:47 PM CDT | Mesoscale Discussion | SPC | Massac, Pope, Pulaski | 58 min |
| Apr 19, 12:43 PM CDT | Mesoscale Discussion | SPC | Clarke, Clay, Covington, Forrest, George, Greene and 30 more | 3 hr |
| Apr 19, 1:17 PM CDT | Severe Thunderstorm Watch | SPC | Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more | 6 hr |
| Apr 19, 2:19 PM CDT | Tornado Watch | SPC | Clarke, Forrest, George, Greene, Hancock, Harrison and 9 more | 7 hr |
| Apr 19, 4:46 PM CDT | Mesoscale Discussion | SPC | George, Greene, Wayne | 89 min |
| Apr 19, 4:30 PM CDT | Severe Thunderstorm Watch | SPC | Bedford, Cannon, Coffee, Franklin, Giles, Grundy and 12 more | 5 hr |
Nearby
Mesoscale Discussions in Arkansas, 2009Mesoscale Discussions in Tennessee, 2009Mesoscale Discussions in Mississippi, 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.