Alert archive / Mississippi / Mesoscale Discussions in 2012
Mesoscale Discussion 1132
The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2012, 10:51 PM CDT for 5 counties in Alabama; 7 parishes in Louisiana; 28 counties in Mississippi. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- Jun 11, 2012, 10:51 PM CDT (03:51 UTC)
- Expired
- Jun 11, 2012, 11:45 PM CDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
All 40 counties
Choctaw County, AL, Clarke County, AL, Marengo County, AL, Sumter County, AL, Washington County, AL, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Saint Helena Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Greene County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Newton County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Rankin County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Wayne County, MS, Wilkinson County, MS
The radar
The Jackson/Brandon,MS radar (KDGX), 72 km from the middle of the area, began a volume at 03:54 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
Jackson, MS (KJAN), launched 00:00Z, 3.9 hours before the alert went out and 77 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.
712 ACUS11 KWNS 120352 SWOMCD SPC MCD 120351 ALZ000-MSZ000-LAZ000-120445- MESOSCALE DISCUSSION 1132 NWS STORM PREDICTION CENTER NORMAN OK 1051 PM CDT MON JUN 11 2012 AREAS AFFECTED...ERN LA...SRN MS...SRN AL CONCERNING...SEVERE THUNDERSTORM WATCH 376... VALID 120351Z - 120445Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 376 CONTINUES. SUMMARY...MCS WILL SPREAD ACROSS THE REMAINDER OF WATCH WITH A THREAT OF STRONG/ISOLATED SEVERE WIND GUSTS. DISCUSSION...LONG-LIVED MCS HAS YET TO WEAKEN APPRECIABLY AS IT SPREADS SWD AT ROUGHLY 30KT...THOUGH INTENSITIES ALONG LEADING EDGE OF STRONGEST UPDRAFTS MAY BE TRENDING DOWN SOME. IN ALL LIKELIHOOD THIS COMPLEX OF STORMS SHOULD PROGRESS ACROSS THE REMAINDER OF WW376 AND APPROACH THE CNTRL GULF COAST AROUND 07Z. UPSTREAM...WEAK WARM ADVECTION ALONG BACK SIDE OF MCS COULD GENERATE ELEVATED CONVECTION ACROSS PARTS OF SRN AR/NRN LA LATER TONIGHT BUT IT/S NOT ENTIRELY CLEAR HOW SEVERE THESE UPDRAFTS WOULD BE. ..DARROW.. 06/12/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...BMX...MOB...JAN...LIX... LAT...LON 31949151 32768771 31178772 30369151 31949151
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 7:33 PM CDT | Mesoscale Discussion | SPC | Fayette, Greene, Hale, Lamar, Marion, Pickens and 4 more | 57 min |
| Jun 11, 8:37 PM CDT | Severe Thunderstorm Watch | SPC | Baldwin, Choctaw, Clarke, Mobile, Washington, Wilcox | 4 hr |
| Jun 11, 11:52 PM CDT | Severe Thunderstorm Watch | SPC | Bossier, Caddo, Claiborne, Union, Webster | 6 hr |
| Jun 12, 2:54 AM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 15 more | 96 min |
| Jun 12, 3:21 AM CDT | Severe Thunderstorm Watch | SPC | Bienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 20 more | 8 hr |
| Jun 12, 6:08 AM CDT | Mesoscale Discussion | SPC | Bienville, Caldwell, Catahoula, Concordia, De Soto, East Carroll and 16 more | 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 Louisiana, 2012Mesoscale Discussions in Alabama, 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.