Alert archive / Mississippi / Mesoscale Discussions in 2012
Mesoscale Discussion 2070
The Storm Prediction Center issued this mesoscale discussion at Oct 17, 2012, 9:28 PM CDT for 5 states. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Oct 17, 2012, 9:28 PM CDT (02:28 UTC)
- Expired
- Oct 17, 2012, 11:00 PM CDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
All 88 counties
Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, Lincoln County, AR, Phillips County, AR, Union County, AR, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Alcorn County, MS, Attala County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Clay County, MS, Coahoma County, MS, Copiah County, MS, DeSoto County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Lafayette County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Madison County, MS, Marshall County, MS, Monroe County, MS, Montgomery County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Union County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS, Fayette County, TN, Hardeman County, TN, Shelby County, TN, Sabine County, TX, San Augustine County, TX, Shelby County, TX
The radar
The Jackson/Brandon,MS radar (KDGX), 172 km from the middle of the area, began a volume at 02:31 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 00:00Z, 2.5 hours before the alert went out and 139 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
- 947 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 1045 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 228 m²/s²
- 0-3 km storm-relative helicity
- 236 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 4.8
The text
As transmitted, in the capitals the NWS used until 2016.
243
ACUS11 KWNS 180229
SWOMCD
SPC MCD 180228
TNZ000-MSZ000-ARZ000-LAZ000-TXZ000-180400-
MESOSCALE DISCUSSION 2070
NWS STORM PREDICTION CENTER NORMAN OK
0928 PM CDT WED OCT 17 2012
AREAS AFFECTED...SERN AR/SWRN TN/NRN AND WRN MS/NRN LA
CONCERNING...TORNADO WATCH 667...668...670...
VALID 180228Z - 180400Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH
667...668...670...CONTINUES.
SUMMARY...THREAT FOR A FEW TORNADOES ALONG WITH LOCALLY DAMAGING
WINDS AND HAIL CONTINUES...
DISCUSSION...LATEST RADAR LOOP REVEALS CONTINUED EWD PROGRESSION OF
A BAND OF STORMS ALONG AND AHEAD OF THE ADVANCING COLD FRONT...WITH
SEVERAL STORMS CONTINUING TO EXHIBIT LOW-LEVEL ROTATION. WHILE
STORMS MOVING EWD ACROSS WRN TN HAVE SHOWN A TENDENCY TO WEAKEN A
BIT...ISOLATED SEVERE/TORNADO POTENTIAL REMAINS. FARTHER S...WHERE
A MORE FAVORABLY MOIST/UNSTABLE ENVIRONMENT EXISTS...GREATER TORNADO
POTENTIAL PERSISTS -- AND WILL LIKELY CONTINUE OVER THE NEXT COUPLE
OF HOURS.
..GOSS/CORFIDI.. 10/18/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MEG...JAN...LZK...LCH...SHV...
LAT...LON 35468905 34948828 33658852 31628993 31199457 31899446
33809232 35488965 35468905SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 17, 7:01 PM CDT | Tornado Watch | SPC | Ashley, Chicot, Columbia, Hempstead, Howard, Lafayette and 5 more | 8 hr |
| Oct 17, 7:35 PM CDT | Mesoscale Discussion | SPC | Arkansas, Clark, Clay, Cleburne, Cleveland, Conway and 37 more | 85 min |
| Oct 17, 11:49 PM CDT | Mesoscale Discussion | SPC | Caldwell, Catahoula, East Carroll, Franklin, Grant, LaSalle and 6 more | 86 min |
| Oct 18, 1:16 AM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Calcasieu, East Baton Rouge and 12 more | 59 min |
| Oct 18, 2:40 AM CDT | Mesoscale Discussion | SPC | Ascension, East Baton Rouge, East Feliciana, Iberville, Livingston, Pointe Coupee and 8 more | 65 min |
| Oct 17, 8:07 PM CDT | Mesoscale Discussion | SPC | Alcorn | 53 min |
| Oct 17, 8:23 PM CDT | Tornado Watch | SPC | Alcorn, Benton, Calhoun, Chickasaw, Itawamba, Lafayette and 8 more | 5 hr |
| Oct 18, 1:09 AM CDT | Mesoscale Discussion | SPC | George, Greene, Perry, Stone | 96 min |
| Oct 17, 8:43 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Carroll, Cheatham, Chester, Decatur, Dickson and 14 more | 4 hr |
| Oct 18, 3:27 PM CDT | Mesoscale Discussion | SPC | Cameron, Hidalgo, Willacy | 93 min |
Nearby
Mesoscale Discussions in Mississippi, 2012Mesoscale Discussions in Louisiana, 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.