Alert archive / Arkansas / Mesoscale Discussions in 2012
Mesoscale Discussion 1127
The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2012, 5:05 PM CDT for 4 states. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- Jun 11, 2012, 5:05 PM CDT (22:05 UTC)
- Expired
- Jun 11, 2012, 6:00 PM CDT
- In force
- 55 min
- Issued by
- the Storm Prediction Center
All 85 counties
Colbert County, AL, Franklin County, AL, Lauderdale County, AL, Lawrence County, AL, Arkansas County, AR, Calhoun County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Faulkner County, AR, Grant County, AR, Hot Spring County, AR, Independence County, AR, Jackson County, AR, Jefferson County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Poinsett County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, St. Francis County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Alcorn County, MS, Benton County, MS, Bolivar County, MS, Coahoma County, MS, DeSoto County, MS, Lafayette County, MS, Lee County, MS, Marshall 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, 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, Perry County, TN, Shelby County, TN, Stewart County, TN, Tipton County, TN, Wayne County, TN, Weakley County, TN
The radar
The Memphis radar (KNQA), 83 km from the middle of the area, began a volume at 22:06 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 nearest sounding before it
Little Rock, AR (KLZK), launched 12:00Z, 10.1 hours before the alert went out and 78 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.
333 ACUS11 KWNS 112206 SWOMCD SPC MCD 112205 TNZ000-ALZ000-KYZ000-MSZ000-MOZ000-ARZ000-112300- MESOSCALE DISCUSSION 1127 NWS STORM PREDICTION CENTER NORMAN OK 0505 PM CDT MON JUN 11 2012 AREAS AFFECTED...AR...MS...TN...KY...AL CONCERNING...SEVERE THUNDERSTORM WATCH 373... VALID 112205Z - 112300Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 373 CONTINUES. SUMMARY...NEW WW WILL LIKELY BE WARRANTED ACROSS PORTIONS OF NRN AL TO NERN LA BY 2230Z. DISCUSSION...LEADING EDGE OF MCS IS SPREADING SEWD AT ROUGHLY 30-35KT AND IS NOW APPROACHING THE ERN-SRN PORTIONS OF WW 373. AT THIS SPEED THE STRONGEST ECHOES WILL EXIT THE WATCH SOON. WW WILL BE WARRANTED DOWNSTREAM TO ACCOUNT FOR THIS EVOLUTION. ..DARROW.. 06/11/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...OHX...HUN...PAH...MEG...JAN...LZK...SHV... LAT...LON 35489311 36708717 34538717 33319312 35489311
SPC 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, 3:29 PM CDT | Mesoscale Discussion | SPC | Colbert, Franklin, Lauderdale | 2 hr |
| 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 |
Nearby
Mesoscale Discussions in Arkansas, 2012Mesoscale Discussions in Tennessee, 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.