Alert archive / Mississippi / Mesoscale Discussions in 2012
Mesoscale Discussion 1129
The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2012, 7:33 PM CDT for 4 states. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- Jun 11, 2012, 7:33 PM CDT (00:33 UTC)
- Expired
- Jun 11, 2012, 8:30 PM CDT
- In force
- 57 min
- Issued by
- the Storm Prediction Center
All 51 counties
Fayette County, AL, Greene County, AL, Hale County, AL, Lamar County, AL, Marion County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Ashley County, AR, Chicot County, AR, Drew County, AR, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Kemper County, MS, Leake County, MS, Leflore County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS
The radar
The Jackson/Brandon,MS radar (KDGX), 71 km from the middle of the area, began a volume at 00:34 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
Jackson, MS (KJAN), launched 00:00Z, 0.6 hours before the alert went out and 68 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
- 2745 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 1430 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 124 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.0
The text
As transmitted, in the capitals the NWS used until 2016.
392 ACUS11 KWNS 120033 SWOMCD SPC MCD 120033 ALZ000-MSZ000-ARZ000-LAZ000-120130- MESOSCALE DISCUSSION 1129 NWS STORM PREDICTION CENTER NORMAN OK 0733 PM CDT MON JUN 11 2012 AREAS AFFECTED...AL...MS...LA...AR CONCERNING...SEVERE THUNDERSTORM WATCH 375... VALID 120033Z - 120130Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 375 CONTINUES. SUMMARY...STRONG WINDS WILL CONTINUE ALONG LEADING EDGE OF MCS AS IT SPREADS SOUTH THIS EVENING. DISCUSSION...LONG-LIVED MCS CONTINUES ITS FORWARD MOTION AT ROUGHLY 30-35KT AS IT PROGRESSES INTO THE MIDDLE PORTIONS OF WW 375. STRONG OUTFLOW...WITH ISOLATED SEVERE WIND GUSTS IN EXCESS OF 50KT...WILL BE COMMON ALONG THE LEADING EDGE OF THIS COMPLEX OF STORMS. WHILE 00Z SOUNDINGS FROM SHV/JAN EXHIBIT MINOR INHIBITION...BMX HAS NO APPARENT CAP AND THIS ENTIRE REGION ALONG THE I-20 CORRIDOR IS QUITE UNSTABLE WITH STEEP LAPSE RATES. FOR THIS REASON IT APPEARS THE MCS WILL PERSIST FOR SOME TIME AND WILL LIKELY APPROACH THE SRN EDGE OF THE WATCH AROUND 0200-0230Z. ..DARROW.. 06/12/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...BMX...HUN...MEG...JAN...LZK... LAT...LON 31889182 33619184 34498712 32748713 31889182
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 8:37 PM CDT | Severe Thunderstorm Watch | SPC | Baldwin, Choctaw, Clarke, Mobile, Washington, Wilcox | 4 hr |
| Jun 11, 10:51 PM CDT | Mesoscale Discussion | SPC | Choctaw, Clarke, Marengo, Sumter, Washington | 54 min |
| Jun 11, 9:25 PM CDT | Severe Thunderstorm Watch | SPC | Sebastian | 7 hr |
| Jun 11, 11:52 PM CDT | Severe Thunderstorm Watch | SPC | Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 15 more | 6 hr |
| Jun 12, 2:54 AM CDT | Mesoscale Discussion | SPC | Calhoun, Clark, Columbia, Dallas, Hempstead, Howard and 8 more | 96 min |
| Jun 12, 3:21 AM CDT | Severe Thunderstorm Watch | SPC | Ashley, Chicot, Columbia, Hempstead, Lafayette, Little River and 3 more | 8 hr |
| Jun 12, 6:08 AM CDT | Mesoscale Discussion | SPC | Ashley, Chicot | 2 hr |
| Jun 12, 7:11 AM CDT | Severe Thunderstorm Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 32 more | 8 hr |
| Jun 12, 9:23 AM CDT | Mesoscale Discussion | SPC | Grant, LaSalle, Natchitoches, Sabine | 67 min |
| Jun 12, 12:12 PM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Beauregard, Calcasieu, Cameron, Iberia and 5 more | 63 min |
Nearby
Mesoscale Discussions in Mississippi, 2012Mesoscale Discussions in Alabama, 2012Mesoscale Discussions in Louisiana, 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.