Alert archive / Arkansas / Mesoscale Discussions in 2007
Mesoscale Discussion 2149
The Storm Prediction Center issued this mesoscale discussion at Nov 21, 2007, 11:17 AM CST for 7 states. It was in force for 118 min.
The area
The outline as issued.
The facts
- Issued
- Nov 21, 2007, 11:17 AM CST (17:17 UTC)
- Expired
- Nov 21, 2007, 1:15 PM CST
- In force
- 118 min
- Issued by
- the Storm Prediction Center
All 96 counties
Arkansas County, AR, Ashley County, AR, Baxter County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Clay County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lafayette County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Little River County, AR, Logan County, AR, Lonoke County, AR, Miller County, AR, Mississippi County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Poinsett County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sevier County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Union County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Union Parish, LA, Webster Parish, LA, Butler County, MO, Dunklin County, MO, Oregon County, MO, Pemiscot County, MO, Ripley County, MO, Bolivar County, MS, Coahoma County, MS, DeSoto County, MS, Panola County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, McCurtain County, OK, Lauderdale County, TN, Shelby County, TN, Tipton County, TN, Bowie County, TX, Cass County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Red River County, TX, Titus County, TX
The radar
The Little Rock radar (KLZK), 64 km from the middle of the area, began a volume at 17:17 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, 5.3 hours before the alert went out and 201 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, 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, 3:18 PM CST | Mesoscale Discussion | SPC | Arkansas, Clark, Clay, Cleburne, Cleveland, Conway and 34 more | 87 min |
| Nov 21, 5:10 PM CST | Mesoscale Discussion | SPC | Ashley, Chicot, Columbia, Union | 65 min |
| Nov 21, 12:24 PM CST | Mesoscale Discussion | SPC | Ascension, East Baton Rouge, East Feliciana, Iberville, Lafayette, Livingston and 13 more | 2 hr |
| Nov 21, 1:32 PM CST | Mesoscale Discussion | SPC | Beauregard, Bienville, Bossier, Caddo, Claiborne, De Soto and 9 more | 118 min |
| Nov 21, 5:29 PM CST | Severe Thunderstorm Watch | SPC | Acadia, Allen, Ascension, Avoyelles, Calcasieu, Catahoula and 19 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 Mississippi, 2007Mesoscale Discussions in Louisiana, 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.