Alert archive / Arkansas / Mesoscale Discussions in 2012

Mesoscale Discussion 51

January 22, 20126 states

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.

Skew-T log-pSkew-T log-p diagram, Little Rock, AR at 00:00Z on 2012-01-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 998 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Little Rock, AR at 00:00Z on 2012-01-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 475 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

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
            35228948

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 22, 6:07 PM CSTMesoscale DiscussionSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 10 more53 min
Jan 22, 6:48 PM CSTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Cleveland, Craighead, Cross and 19 more57 min
Jan 22, 7:59 PM CSTMesoscale DiscussionSPCBradley, Calhoun, Columbia, Ouachita, Union91 min
Jan 22, 9:47 PM CSTMesoscale DiscussionSPCAshley, Chicot, Crittenden, Desha, Phillips58 min
Jan 22, 10:59 PM CSTTornado WatchSPCAshley, Chicot7 hr
Jan 22, 7:28 PM CSTTornado WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more5 hr
Jan 22, 8:25 PM CSTMesoscale DiscussionSPCBond, Champaign, Christian, Clark, Clay, Coles and 21 more2 hr
Jan 22, 10:49 PM CSTMesoscale DiscussionSPCClark, Crawford, Edwards, Gallatin, Hardin, Lawrence and 2 more86 min
Jan 22, 11:34 PM CSTSevere Thunderstorm WatchSPCAllen, Barren, Breckinridge, Bullitt, Butler, Edmonson and 17 more3 hr
Jan 23, 12:52 AM CSTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Boone and 65 more113 min
Jan 23, 1:14 AM CSTSevere Thunderstorm WatchSPCAdair, Anderson, Bath, Bell, Boone, Bourbon and 59 more5 hr
Jan 23, 4:11 AM CSTMesoscale DiscussionSPCBath, Bell, Breathitt, Carter, Clay, Elliott and 19 more64 min
Jan 23, 10:46 AM CSTMesoscale DiscussionSPCBath, Boone, Bourbon, Bracken, Campbell, Clark and 18 more89 min
Jan 23, 1:25 AM CSTMesoscale DiscussionSPCAttala, Calhoun, Carroll, Chickasaw, Choctaw, Claiborne and 35 more2 hr
Jan 23, 2:44 AM CSTTornado WatchSPCGreene, Perry, Wayne9 hr
Jan 23, 4:02 AM CSTMesoscale DiscussionSPCClarke, Covington, Forrest, George, Greene, Hancock and 10 more118 min
Jan 23, 6:38 AM CSTMesoscale DiscussionSPCForrest, George, Greene, Hancock, Harrison, Jackson and 3 more97 min
Jan 23, 1:54 AM CSTSevere Thunderstorm WatchSPCAnderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 25 more3 hr
Jan 23, 4:28 AM CSTMesoscale DiscussionSPCAnderson, Blount, Bradley, Campbell, Claiborne, Grainger and 14 more62 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.