Alert archive / Arkansas / Mesoscale Discussions in 2012
Mesoscale Discussion 51
The Storm Prediction Center issued this mesoscale discussion at Jan 22, 2012, 8:37 PM CST for 6 states. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Jan 22, 2012, 8:37 PM CST (02:37 UTC)
- Expired
- Jan 22, 2012, 10:00 PM CST
- In force
- 83 min
- Issued by
- the Storm Prediction Center
All 63 counties
Arkansas County, AR, Bradley 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, Jefferson County, AR, Lee County, AR, Lincoln County, AR, Mississippi County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, St. Francis County, AR, Woodruff County, AR, Alexander County, IL, Franklin County, IL, Hamilton County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Ballard County, KY, Carlisle County, KY, Fulton County, KY, Hickman County, KY, McCracken County, KY, Cape Girardeau County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Scott County, MO, Stoddard 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, Washington County, MS, Dyer County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN
The radar
The Memphis radar (KNQA), 80 km from the middle of the area, began a volume at 02:39 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, 2.6 hours before the alert went out and 138 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.
531
ACUS11 KWNS 230237
SWOMCD
SPC MCD 230237
ILZ000-KYZ000-TNZ000-MOZ000-MSZ000-ARZ000-230400-
MESOSCALE DISCUSSION 0051
NWS STORM PREDICTION CENTER NORMAN OK
0837 PM CST SUN JAN 22 2012
AREAS AFFECTED...PORTIONS OF THE LOWER/MID-MS VALLEY
CONCERNING...TORNADO WATCH 5...6...
VALID 230237Z - 230400Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 5...6...CONTINUES.
NRN/CNTRL PORTIONS OF QLCS FROM SWRN IL INTO NERN AR SHOULD
ACCELERATE E/NEWD WITH PRIMARY THREAT OF DAMAGING WINDS. GREATER
TORNADO THREAT SHOULD PERSIST ALONG THE BROKEN SRN PORTION OF THE
LINE ACROSS E-CNTRL/SERN AR EVOLVING ACROSS THE MS RIVER.
AS OF 0230Z...A 450-MI LONG QLCS EXTENDED FROM SWRN IL INTO S-CNTRL
AR. GREATEST RELATIVE SEVERE THREAT EXISTS ALONG THE SRN PORTION OF
THIS LINE WITH A FEW LONG-TRACKED SUPERCELLS NOW PROGRESSING INTO
PARTS OF E-CNTRL/SERN AR. EFFECTIVE SRH WILL REMAIN EXTREME AOA 500
M2/S2 AND WITHIN THE BROADEST WARM SECTOR CHARACTERIZED BY 62-64 F
SURFACE DEW POINTS...POTENTIAL FOR SIGNIFICANT TORNADOES REMAINS
HIGH AS ACTIVITY APPROACHES SWRN TN/NWRN MS.
THE SOLID LINEAR STRUCTURE FARTHER N WITHIN A COMPARATIVELY NARROW
SURFACE-BASED WARM SECTOR SHOULD PREDOMINATELY FAVOR DAMAGING WINDS.
ALTHOUGH OBSERVED METAR GUSTS HAVE REMAINED IN THE 35-40 KT RANGE
THUS FAR IN SERN MO/NERN AR...THE ORGANIZED STRUCTURE OF THE LINE
AMIDST STRONG MID-LEVEL DCVA MAY AID IN FURTHER INTENSIFICATION AS
IT CROSSES THE MS RIVER TOWARDS THE LOWER OH VALLEY. FOR ADDITIONAL
INFORMATION FARTHER N OF WW 6...PLEASE SEE MCD 50.
..GRAMS.. 01/23/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PAH...MEG...JAN...LSX...LZK...
LAT...LON 35228948 33519037 33139115 33259203 33399251 36279063
37708980 38198946 38458862 38528812 38278806 37738827
35228948SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 9:47 PM CST | Mesoscale Discussion | SPC | Ashley, Chicot, Crittenden, Desha, Phillips | 58 min |
| Jan 22, 10:59 PM CST | Tornado Watch | SPC | Ashley, Chicot | 7 hr |
| Jan 22, 7:28 PM CST | Tornado Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 5 hr |
| Jan 22, 8:25 PM CST | Mesoscale Discussion | SPC | Bond, Champaign, Christian, Clark, Clay, Coles and 21 more | 2 hr |
| Jan 22, 10:49 PM CST | Mesoscale Discussion | SPC | Clark, Crawford, Edwards, Gallatin, Hardin, Lawrence and 2 more | 86 min |
| Jan 22, 11:34 PM CST | Severe Thunderstorm Watch | SPC | Allen, Barren, Breckinridge, Bullitt, Butler, Edmonson and 17 more | 3 hr |
| Jan 23, 12:52 AM CST | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Barren, Bath, Boone and 65 more | 113 min |
| Jan 23, 1:14 AM CST | Severe Thunderstorm Watch | SPC | Adair, Anderson, Bath, Bell, Boone, Bourbon and 59 more | 5 hr |
| Jan 23, 4:11 AM CST | Mesoscale Discussion | SPC | Bath, Bell, Breathitt, Carter, Clay, Elliott and 19 more | 64 min |
| Jan 23, 10:46 AM CST | Mesoscale Discussion | SPC | Bath, Boone, Bourbon, Bracken, Campbell, Clark and 18 more | 89 min |
| Jan 23, 1:25 AM CST | Mesoscale Discussion | SPC | Attala, Calhoun, Carroll, Chickasaw, Choctaw, Claiborne and 35 more | 2 hr |
| Jan 23, 2:44 AM CST | Tornado Watch | SPC | Greene, Perry, Wayne | 9 hr |
| Jan 23, 4:02 AM CST | Mesoscale Discussion | SPC | Clarke, Covington, Forrest, George, Greene, Hancock and 10 more | 118 min |
| Jan 23, 6:38 AM CST | Mesoscale Discussion | SPC | Forrest, George, Greene, Hancock, Harrison, Jackson and 3 more | 97 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 Arkansas, 2012Mesoscale Discussions in Illinois, 2012Mesoscale Discussions in Mississippi, 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.