Alert archive / Mississippi / Mesoscale Discussions in 2007
Mesoscale Discussion 2254
The Storm Prediction Center issued this mesoscale discussion at Dec 22, 2007, 12:38 PM CST for 6 states. It was in force for 97 min.
The area
The outline as issued.
The facts
- Issued
- Dec 22, 2007, 12:38 PM CST (18:38 UTC)
- Expired
- Dec 22, 2007, 2:15 PM CST
- In force
- 97 min
- Issued by
- the Storm Prediction Center
All 74 counties
Arkansas County, AR, Ashley County, AR, Chicot County, AR, Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Desha County, AR, Drew County, AR, Greene County, AR, Lee County, AR, Mississippi County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, St. Francis County, AR, Fulton County, KY, Caldwell Parish, LA, Catahoula Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Dunklin County, MO, New Madrid County, MO, Pemiscot County, MO, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Claiborne County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Lafayette County, MS, Leflore County, MS, Marshall County, MS, Montgomery County, MS, Panola County, MS, Quitman County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Union County, MS, Warren County, MS, Washington County, MS, Yalobusha County, MS, Yazoo County, MS, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood 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), 169 km from the middle of the area, began a volume at 18:41 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, 6.6 hours before the alert went out and 115 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 815 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 218 m²/s²
- 0-3 km storm-relative helicity
- 264 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 |
|---|---|---|---|---|
| Dec 22, 2:38 PM CST | Tornado Watch | SPC | Ashley, Chicot | 5 hr |
| Dec 22, 3:51 PM CST | Mesoscale Discussion | SPC | Chicot | 54 min |
| Dec 22, 9:30 AM CST | Mesoscale Discussion | SPC | Andrew, Buchanan, Caldwell, Clay, Clinton, Daviess and 14 more | 3 hr |
| Dec 22, 12:16 PM CST | Mesoscale Discussion | SPC | Adair, Andrew, Barton, Bates, Benton, Buchanan and 36 more | 4 hr |
Nearby
Mesoscale Discussions in Mississippi, 2007Mesoscale Discussions in Arkansas, 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.