Alert archive / Arkansas / Mesoscale Discussions in 2007
Mesoscale Discussion 2153
The Storm Prediction Center issued this mesoscale discussion at Nov 21, 2007, 3:18 PM CST for 6 states. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- Nov 21, 2007, 3:18 PM CST (21:18 UTC)
- Expired
- Nov 21, 2007, 4:45 PM CST
- In force
- 87 min
- Issued by
- the Storm Prediction Center
All 77 counties
Arkansas County, AR, Clark County, AR, Clay County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hot Spring County, AR, Independence County, AR, Izard 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, Perry County, AR, Phillips County, AR, Pike County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Alexander County, IL, Massac County, IL, Pulaski County, IL, Ballard County, KY, Carlisle County, KY, Fulton County, KY, Hickman County, KY, McCracken County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Dunklin County, MO, Madison County, MO, Mississippi 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, Coahoma County, MS, DeSoto County, MS, Tate County, MS, Tunica County, MS, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Haywood County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN
The radar
The Little Rock radar (KLZK), 109 km from the middle of the area, began a volume at 21:19 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, 9.3 hours before the alert went out and 123 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
- 91 J/kg
- Mixed-layer CIN
- -84 J/kg
- Mixed-layer LCL
- 805 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 108 m²/s²
- 0-3 km storm-relative helicity
- 93 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Nov 21, 11:17 AM CST | Mesoscale Discussion | SPC | Arkansas, Ashley, Baxter, Bradley, Calhoun, Chicot and 58 more | 118 min |
| Nov 21, 12:47 PM CST | Tornado Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 43 more | 6 hr |
| Nov 21, 2:29 PM CST | Severe Thunderstorm Watch | SPC | Ashley, Chicot, Columbia, Lafayette, Miller, Union | 8 hr |
| Nov 21, 5:10 PM CST | Mesoscale Discussion | SPC | Ashley, Chicot, Columbia, Union | 65 min |
| Nov 21, 5:34 PM CST | Mesoscale Discussion | SPC | Boone, Carroll, Jo Daviess, McHenry, Ogle, Rock Island and 3 more | 4 hr |
| Nov 21, 12:24 PM CST | Mesoscale Discussion | SPC | Adams, Amite, Attala, Claiborne, Copiah, Covington and 30 more | 2 hr |
| Nov 21, 5:29 PM CST | Severe Thunderstorm Watch | SPC | Adams, Alcorn, Amite, Attala, Benton, Bolivar and 51 more | 6 hr |
| Nov 21, 12:28 PM CST | Mesoscale Discussion | SPC | Atchison, Gentry, Harrison, Holt, Mercer, Nodaway and 3 more | 5 hr |
Nearby
Mesoscale Discussions in Arkansas, 2007Mesoscale Discussions in Missouri, 2007Mesoscale Discussions in Tennessee, 2007Every mesoscale discussion in 2007
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.