Alert archive / Tennessee / Mesoscale Discussions in 2012
Mesoscale Discussion 1124
The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2012, 3:29 PM CDT for 6 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 11, 2012, 3:29 PM CDT (20:29 UTC)
- Expired
- Jun 11, 2012, 5:30 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 98 counties
Colbert County, AL, Franklin County, AL, Lauderdale County, AL, Arkansas County, AR, Cleveland County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Jefferson County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Monroe County, AR, Perry County, AR, Phillips County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, St. Francis County, AR, Woodruff County, AR, Hardin County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Union County, IL, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Todd County, KY, Trigg County, KY, Alcorn County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, Coahoma County, MS, DeSoto County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Monroe County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Yalobusha 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, McNairy County, TN, Montgomery County, TN, Obion County, TN, Perry County, TN, Shelby County, TN, Stewart County, TN, Tipton County, TN, Wayne County, TN, Weakley County, TN
The radar
The Memphis radar (KNQA), 46 km from the middle of the area, began a volume at 20:30 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, 8.5 hours before the alert went out and 81 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
- 2451 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 786 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 86 m²/s²
- 0-3 km storm-relative helicity
- 120 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 4.9
The text
As transmitted, in the capitals the NWS used until 2016.
186
ACUS11 KWNS 112030
SWOMCD
SPC MCD 112029
TNZ000-KYZ000-ALZ000-ILZ000-MSZ000-MOZ000-ARZ000-112230-
MESOSCALE DISCUSSION 1124
NWS STORM PREDICTION CENTER NORMAN OK
0329 PM CDT MON JUN 11 2012
AREAS AFFECTED...AR...MO...IL...KY...TN...MS...AL
CONCERNING...SEVERE THUNDERSTORM WATCH 373...
VALID 112029Z - 112230Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 373
CONTINUES.
SUMMARY...DAMAGING WINDS AND HAIL WILL ACCOMPANY QLCS SPREADING SEWD
INTO WRN TN/KY...ERN AR....NRN MS...AND NWRN AL OVER THE NEXT FEW
HOURS.
DISCUSSION...VIGOROUS DEEP CONVECTION COMPRISES MATURE LARGE SCALE
BOWING SQUALL LINE FROM THE CONFLUENCE OF THE OH/MS RIVERS SWD INTO
WRN TN AND THEN WWD ACROSS ERN/CNTRL AR LATE THIS AFTERNOON.
DAMAGING WINDS OF 60-70 MPH HAVE OCCURRED NEAR THE APEX OF THIS
SQUALL LINE...FROM NERN AR TO THE MO BOOTHEEL OVER THE PAST HOUR.
EXPECT THESE CONDITIONS MAY ACCOMPANY THE STORMS NOW MOVING ACROSS
THE MEMPHIS AREA.
BASED ON THE LONGER-TERM LARGE SCALE MOTION OF THE SQUALL LINE AT
ABOUT 40 KT...WITH A SMALL ADJUSTMENT MADE FOR POSSIBLE ACCELERATION
NEAR THE APEX OF THE BOW...THE LINE WILL MOVE INTO NRN MS WITHIN THE
NEXT HOUR AND TO THE EDGE OF THE WATCH IN TN/KY BY ABOUT 22Z OR 500
PM CDT. ALSO EXPECT NWRN AL TO EXPERIENCE THE AFFECTS OF THIS SQUALL
LINE BETWEEN 500-600 PM CDT.
..CARBIN.. 06/11/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LMK...OHX...BMX...HUN...PAH...MEG...JAN...LZK...
LAT...LON 33778823 33829024 33959049 34109079 34019142 33819162
33819288 34689355 34949367 35039264 35119169 35449115
35519006 36188929 36878913 37218936 37598941 37588807
37378782 37588735 37048728 37058705 36668694 35608722
35428719 34848720 34728724 34658743 34308750 34188812
33778823SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 12:22 PM CDT | Mesoscale Discussion | SPC | Geneva, Henry, Houston | 53 min |
| Jun 11, 1:12 PM CDT | Mesoscale Discussion | SPC | Colbert, Franklin, Lauderdale, Limestone | 93 min |
| Jun 11, 1:28 PM CDT | Severe Thunderstorm Watch | SPC | Colbert, Cullman, Franklin, Lauderdale, Lawrence | 7 hr |
| Jun 11, 5:05 PM CDT | Mesoscale Discussion | SPC | Colbert, Franklin, Lauderdale, Lawrence | 55 min |
| Jun 11, 5:17 PM CDT | Severe Thunderstorm Watch | SPC | Autauga, Bibb, Blount, Calhoun, Chambers, Chilton and 28 more | 6 hr |
| Jun 11, 9:31 AM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Clay, Cleburne and 16 more | 59 min |
| Jun 11, 9:45 AM CDT | Severe Thunderstorm Watch | SPC | Baxter, Benton, Boone, Carroll, Clay, Cleburne and 23 more | 6 hr |
| Jun 11, 3:59 PM CDT | Mesoscale Discussion | SPC | Crawford, Polk, Scott, Sebastian, Washington | 91 min |
| Jun 11, 11:23 AM CDT | Mesoscale Discussion | SPC | Alexander, Clay, Effingham, Franklin, Gallatin, Hamilton and 15 more | 97 min |
Nearby
Mesoscale Discussions in Tennessee, 2012Mesoscale Discussions in Mississippi, 2012Mesoscale Discussions in Arkansas, 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.