Alert archive / Mississippi / Mesoscale Discussions in 2012
Mesoscale Discussion 52
The Storm Prediction Center issued this mesoscale discussion at Jan 22, 2012, 9:47 PM CST for 5 states. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- Jan 22, 2012, 9:47 PM CST (03:47 UTC)
- Expired
- Jan 22, 2012, 10:45 PM CST
- In force
- 58 min
- Issued by
- the Storm Prediction Center
All 110 counties
Colbert County, AL, Franklin County, AL, Lamar County, AL, Lauderdale County, AL, Marion County, AL, Ashley County, AR, Chicot County, AR, Crittenden County, AR, Desha County, AR, Phillips County, AR, Caldwell Parish, LA, Catahoula Parish, LA, Concordia 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, Adams County, MS, Alcorn County, MS, Amite County, MS, Attala County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Clay County, MS, Coahoma County, MS, Copiah County, MS, DeSoto County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Itawamba County, MS, Jefferson County, MS, Lafayette County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Marshall County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Wilkinson County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dickson 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, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lauderdale County, TN, Lawrence County, TN, Lewis County, TN, Madison County, TN, Maury County, TN, McNairy County, TN, Perry County, TN, Shelby County, TN, Stewart County, TN, Tipton County, TN, Wayne County, TN, Weakley County, TN
The radar
The Columbus AFB radar (KGWX), 159 km from the middle of the area, began a volume at 03:50 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 00:00Z, 3.8 hours before the alert went out and 111 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
- 998 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 455 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- 475 m²/s²
- 0-3 km storm-relative helicity
- 474 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 10.8
The text
As transmitted, in the capitals the NWS used until 2016.
497
ACUS11 KWNS 230347
SWOMCD
SPC MCD 230347
TNZ000-ALZ000-KYZ000-MSZ000-MOZ000-ARZ000-LAZ000-230445-
MESOSCALE DISCUSSION 0052
NWS STORM PREDICTION CENTER NORMAN OK
0947 PM CST SUN JAN 22 2012
AREAS AFFECTED...PORTIONS OF THE TN/LOWER MS VALLEYS
CONCERNING...TORNADO WATCH 5...
VALID 230347Z - 230445Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 5 CONTINUES.
PORTIONS OF WW 5 WILL LIKELY BE REPLACED PRIOR TO ITS SCHEDULED 06Z
EXPIRATION WITH A NEW TORNADO WATCH THAT WILL ENCOMPASS AREAS
FARTHER E/S IN WRN/MIDDLE TN...NRN/CNTRL MS...NWRN AL...AND PERHAPS
NERN LA.
BROKEN SQUALL LINE HAS ACCELERATED EWD ACROSS NERN AR ON APPROACH TO
THE MS RIVER...WITH A MORE GRADUAL EWD PROGRESSION OCCURRING IN SERN
AR. LONGER-LIVED MESOCYCLONES HAVE LARGELY WEAKENED IN AR...WITH A
TRANSITION TO PREDOMINATELY BOWING/LEWP STRUCTURES. THIS SUGGESTS
SIGNIFICANT TORNADO POTENTIAL IS EVOLVING INTO A COMPARATIVELY
GREATER DAMAGING WIND THREAT. FARTHER E/SE...A BAND OF SHOWERS HAS
SLOWLY DEEPENED FROM PORTIONS OF CNTRL LA INTO N-CNTRL MS. THESE
SHOWERS APPEAR TO BE OCCURRING WITHIN A LOW-LEVEL CONFLUENCE AXIS AS
03Z SURFACE ANALYSIS NOTED A MODEST PRESSURE RISE/FALL
COUPLET...WELL AHEAD OF PACIFIC COLD FRONT BACK IN NERN TX. GIVEN
THE VERY STRONGLY SHEARED ENVIRONMENT...IT APPEARS REASONABLE THAT A
COUPLE OF CELLS WOULD MATURE WITHIN THIS BAND OF SHOWERS AND DEEPEN
INTO DISCRETE SUPERCELLS IN THE NEXT FEW HOURS.
..GRAMS.. 01/23/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...OHX...BMX...HUN...PAH...MEG...JAN...LIX...LZK...
LCH...SHV...
LAT...LON 32979229 34509084 35489018 36028982 36458875 36548791
36448692 35818697 34208764 32798873 31199063 31049140
31179188 31459223 32369236 32979229SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 22, 10:59 PM CST | Tornado Watch | SPC | Blount, Colbert, Cullman, DeKalb, Fayette, Franklin and 17 more | 7 hr |
| Jan 23, 1:25 AM CST | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Calhoun, Cherokee, Chilton and 31 more | 2 hr |
| Jan 23, 2:44 AM CST | Tornado Watch | SPC | Autauga, Barbour, Bibb, Blount, Bullock, Butler and 37 more | 9 hr |
| Jan 23, 4:02 AM CST | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Butler, Calhoun, Chambers and 32 more | 118 min |
| Jan 23, 6:38 AM CST | Mesoscale Discussion | SPC | Autauga, Baldwin, Barbour, Bullock, Butler, Calhoun and 27 more | 97 min |
| Jan 23, 11:30 AM CST | Mesoscale Discussion | SPC | Barbour, Bullock, Coffee, Crenshaw, Pike, Russell | 2 hr |
| Jan 22, 6:07 PM CST | Mesoscale Discussion | SPC | Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 10 more | 53 min |
| Jan 22, 6:48 PM CST | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Cleveland, Craighead, Cross and 19 more | 57 min |
| Jan 22, 7:59 PM CST | Mesoscale Discussion | SPC | Bradley, Calhoun, Columbia, Ouachita, Union | 91 min |
| Jan 22, 8:37 PM CST | Mesoscale Discussion | SPC | Arkansas, Bradley, Chicot, Clay, Craighead, Crittenden and 14 more | 83 min |
| Jan 23, 1:54 AM CST | Severe Thunderstorm Watch | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 25 more | 3 hr |
| Jan 23, 4:28 AM CST | Mesoscale Discussion | SPC | Anderson, Blount, Bradley, Campbell, Claiborne, Grainger and 14 more | 62 min |
Nearby
Mesoscale Discussions in Mississippi, 2012Mesoscale Discussions in Tennessee, 2012Mesoscale Discussions in Louisiana, 2012Every mesoscale discussion in 2012
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.