Alert archive / Arkansas / Mesoscale Discussions in 2005
Mesoscale Discussion 507
The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2005, 3:18 PM CDT for 4 states. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- Apr 6, 2005, 3:18 PM CDT (20:18 UTC)
- Expired
- Apr 6, 2005, 4:45 PM CDT
- In force
- 87 min
- Issued by
- the Storm Prediction Center
All 50 counties
Baxter County, AR, Clay County, AR, Cleburne County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Lee County, AR, Marion County, AR, Mississippi County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Randolph County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, White County, AR, Woodruff County, AR, Dunklin County, MO, Pemiscot County, MO, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, Coahoma County, MS, DeSoto County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Monroe 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, Fayette County, TN, Haywood County, TN, Lauderdale County, TN, Shelby County, TN, Tipton County, TN
The radar
The Memphis radar (KNQA), 103 km from the middle of the area, began a volume at 20:21 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 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, 8.3 hours before the alert went out and 117 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
- 74 J/kg
- Mixed-layer CIN
- -186 J/kg
- Mixed-layer LCL
- 848 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 258 m²/s²
- 0-3 km storm-relative helicity
- 320 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
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 5, 8:25 PM CDT | Severe Thunderstorm Watch | SPC | Columbia, Hempstead, Lafayette, Little River, Miller, Nevada and 1 more | 8 hr |
| Apr 5, 8:30 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Benton, Boone, Carroll, Clark, Conway and 27 more | 5 hr |
| Apr 5, 10:40 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Union | 2 hr |
| Apr 5, 11:41 PM CDT | Mesoscale Discussion | SPC | Arkansas, Baxter, Calhoun, Cleburne, Cleveland, Conway and 31 more | 34 min |
| Apr 6, 7:46 AM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 30 more | 119 min |
| Apr 6, 10:40 AM CDT | Mesoscale Discussion | SPC | Ashley, Chicot, Desha, Drew | 65 min |
| Apr 6, 12:46 PM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Cleburne, Conway and 17 more | 119 min |
| Apr 6, 1:55 PM CDT | Tornado Watch | SPC | Baxter, Clay, Cleburne, Craighead, Crittenden, Cross and 19 more | 7 hr |
| Apr 6, 5:44 PM CDT | Mesoscale Discussion | SPC | Arkansas, Baxter, Clay, Cleburne, Craighead, Crittenden and 20 more | 91 min |
| Apr 6, 2:55 AM CDT | Tornado Watch | SPC | Adams, Amite, Claiborne, Clarke, Copiah, Covington and 26 more | 7 hr |
| Apr 6, 5:45 AM CDT | Mesoscale Discussion | SPC | Adams, Amite, Attala, Carroll, Choctaw, Claiborne and 36 more | 90 min |
| Apr 6, 7:00 AM CDT | Tornado Watch | SPC | Adams, Amite, Claiborne, Clarke, Copiah, Covington and 32 more | 6 hr |
| Apr 6, 9:29 AM CDT | Mesoscale Discussion | SPC | Adams, Amite, Claiborne, Clarke, Copiah, Covington and 32 more | 2 hr |
| Apr 6, 11:05 AM CDT | Tornado Watch | SPC | Adams, Amite, Attala, Bolivar, Calhoun, Carroll and 51 more | 8 hr |
| Apr 6, 11:05 AM CDT | Tornado Watch | SPC | George, Greene, Harrison, Jackson, Wayne | 8 hr |
| Apr 6, 1:21 PM CDT | Mesoscale Discussion | SPC | Adams, Amite, Attala, Bolivar, Carroll, Choctaw and 55 more | 84 min |
| Apr 6, 3:43 PM CDT | Mesoscale Discussion | SPC | Adams, Amite, Attala, Carroll, Choctaw, Claiborne and 53 more | 92 min |
| Apr 6, 4:53 PM CDT | Mesoscale Discussion | SPC | Alcorn, Tishomingo | 37 min |
| Apr 6, 6:01 PM CDT | Mesoscale Discussion | SPC | Attala, Bolivar, Carroll, Choctaw, Clarke, Clay and 44 more | 59 min |
| Apr 6, 6:45 PM CDT | Tornado Watch | SPC | Attala, Carroll, Choctaw, Clarke, Clay, Covington and 31 more | 6 hr |
Nearby
Mesoscale Discussions in Arkansas, 2005Mesoscale Discussions in Mississippi, 2005Mesoscale Discussions in Tennessee, 2005Every mesoscale discussion in 2005
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.