Alert archive / Tennessee / Mesoscale Discussions in 2012
Mesoscale Discussion 460
The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2012, 2:22 PM CDT for 20 counties in Mississippi; Pemiscot County, Missouri; 22 counties in Tennessee. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- Apr 5, 2012, 2:22 PM CDT (19:22 UTC)
- Expired
- Apr 5, 2012, 3:15 PM CDT
- In force
- 53 min
- Issued by
- the Storm Prediction Center
All 43 counties
Pemiscot County, MO, Alcorn County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, DeSoto County, MS, Itawamba 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, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Shelby County, TN, Stewart County, TN, Tipton County, TN, Weakley County, TN
The radar
The Memphis radar (KNQA), 56 km from the middle of the area, began a volume at 19:23 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, 7.4 hours before the alert went out and 94 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
- 42 J/kg
- Mixed-layer CIN
- -132 J/kg
- Mixed-layer LCL
- 1448 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- -41 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.2
The text
As transmitted, in the capitals the NWS used until 2016.
446 ACUS11 KWNS 051922 SWOMCD SPC MCD 051922 ALZ000-TNZ000-KYZ000-MSZ000-MOZ000-ARZ000-052015- MESOSCALE DISCUSSION 0460 NWS STORM PREDICTION CENTER NORMAN OK 0222 PM CDT THU APR 05 2012 AREAS AFFECTED...NRN MS...WRN TN...FAR NERN AR...MO BOOTHEEL CONCERNING...SEVERE THUNDERSTORM WATCH 145... VALID 051922Z - 052015Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 145 CONTINUES. SURFACE ANALYSIS AT 18-19Z SHOWS A LOW PRESSURE CENTER OVER NWRN TN...WITH A COLD FRONT ARCING SEWD INTO AL...AND A STATIONARY FRONT EXTENDING EWD INTO MIDDLE AND ERN TN. SHORT-LIVED TORNADOES HAVE OCCURRED OVER THE MO BOOTHEEL DURING THE PAST 1-2 HRS NEAR THE SURFACE LOW AND MIDLEVEL VORTICITY MAX. HOWEVER...GIVEN THE INCREASE IN STORM MERGERS AND RAIN COOLED SURFACE AIRMASS...THIS THREAT MAY END FAIRLY SOON. OTHERWISE...LOW-LEVEL MOIST AXIS WITH SURFACE DEWPOINTS IN THE MID TO UPR 50S EXTENDS NWWD FROM THE TN VALLEY INTO SERN MO. GIVEN COLD MIDLEVEL TEMPERATURES ABOVE THIS MOISTURE...MODERATELY STEEP LAPSE RATES AND MLCAPE VALUES FROM 500-1000 J/KG WILL CONTINUE TO SUPPORT A RISK FOR LARGE HAIL. ..GARNER.. 04/05/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...OHX...HUN...PAH...MEG...JAN... LAT...LON 36508983 36508768 33928846 33939059 36508983
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 5, 1:35 AM CDT | Mesoscale Discussion | SPC | Adams, Amite, Claiborne, Copiah, Franklin, Hinds and 8 more | 85 min |
| Apr 5, 1:53 AM CDT | Tornado Watch | SPC | Adams, Amite, Attala, Bolivar, Carroll, Choctaw and 45 more | 9 hr |
| Apr 5, 3:30 AM CDT | Mesoscale Discussion | SPC | Adams, Amite, Attala, Carroll, Claiborne, Copiah and 39 more | 2 hr |
| Apr 5, 3:56 AM CDT | Tornado Watch | SPC | Amite, Hancock, Harrison, Jackson, Pearl River, Pike and 2 more | 6 hr |
| Apr 5, 7:36 AM CDT | Mesoscale Discussion | SPC | Adams, Attala, Carroll, Choctaw, Claiborne, Clarke and 44 more | 54 min |
| Apr 5, 9:14 AM CDT | Severe Thunderstorm Watch | SPC | Greene, Perry, Wayne | 8 hr |
| Apr 5, 10:41 AM CDT | Mesoscale Discussion | SPC | Greene, Wayne | 94 min |
| Apr 5, 10:43 AM CDT | Severe Thunderstorm Watch | SPC | Clarke, Covington, Forrest, Franklin, Jasper, Jefferson Davis and 7 more | 4 hr |
| Apr 5, 12:09 PM CDT | Mesoscale Discussion | SPC | Alcorn, Benton, DeSoto, Itawamba, Lafayette, Lee and 8 more | 96 min |
| Apr 5, 12:18 PM CDT | Severe Thunderstorm Watch | SPC | Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more | 5 hr |
| Apr 5, 12:54 PM CDT | Mesoscale Discussion | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 23 more | 96 min |
| Apr 5, 1:21 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bedford, Benton, Bledsoe, Blount, Bradley and 61 more | 8 hr |
| Apr 5, 3:06 PM CDT | Mesoscale Discussion | SPC | Anderson, Bedford, Bledsoe, Blount, Bradley, Campbell and 60 more | 54 min |
Nearby
Mesoscale Discussions in Tennessee, 2012Mesoscale Discussions in Mississippi, 2012Mesoscale Discussions in Missouri, 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.