Alert archive / Indiana / Mesoscale Discussions in 2012
Mesoscale Discussion 336
The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2012, 3:17 PM CDT for 15 counties in Illinois; 41 counties in Indiana; 7 counties in Kentucky. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- Mar 23, 2012, 3:17 PM CDT (20:17 UTC)
- Expired
- Mar 23, 2012, 4:15 PM CDT
- In force
- 58 min
- Issued by
- the Storm Prediction Center
All 63 counties
Champaign County, IL, Clark County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Ford County, IL, Iroquois County, IL, Jasper County, IL, Kankakee County, IL, Lawrence County, IL, Piatt County, IL, Richland County, IL, Vermilion County, IL, Bartholomew County, IN, Benton County, IN, Boone County, IN, Brown County, IN, Carroll County, IN, Clay County, IN, Clinton County, IN, Crawford County, IN, Daviess County, IN, Dubois County, IN, Fountain County, IN, Greene County, IN, Harrison County, IN, Hendricks County, IN, Jackson County, IN, Jasper County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Newton County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Perry County, IN, Pike County, IN, Pulaski County, IN, Putnam County, IN, Spencer County, IN, Sullivan County, IN, Tippecanoe County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, Warrick County, IN, Washington County, IN, White County, IN, Breckinridge County, KY, Daviess County, KY, Hancock County, KY, McLean County, KY, Meade County, KY, Muhlenberg County, KY, Ohio County, KY
The radar
The Indianapolis radar (KIND), 113 km from the middle of the area, began a volume at 20:16 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
Lincoln, IL (KILX), launched 12:00Z, 8.3 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 808 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
639
ACUS11 KWNS 232018
SWOMCD
SPC MCD 232017
INZ000-KYZ000-ILZ000-232115-
MESOSCALE DISCUSSION 0336
NWS STORM PREDICTION CENTER NORMAN OK
0317 PM CDT FRI MAR 23 2012
AREAS AFFECTED...CNTRL/ERN IL...SRN/WRN IND...WRN KY
CONCERNING...SEVERE THUNDERSTORM WATCH 101...
VALID 232017Z - 232115Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 101
CONTINUES.
A DOWNSTREAM WW ISSUANCE IS BEING CONSIDERED FOR PORTIONS OF ERN
IL...CNTRL/SRN IND.
AN ARC OF SEMI-DISCRETE/CLUSTERS OF TSTMS WITH EMBEDDED SUPERCELL
STRUCTURES HAD PERSISTED ACROSS PORTIONS OF SERN IL INTO SWRN IND AS
OF 20Z. AN APPARENT MCV HAS BEEN NOTED IN RADAR REFLECTIVITY WITHIN
THE REMNANT OF THE INITIAL LONG-LIVED SUPERCELL RESPONSIBLE FOR
NUMEROUS BRIEF TORNADO REPORTS EARLIER. REFLECTIVITY STRUCTURES
CONTINUE TO GRADUALLY WEAKEN INVOF MCV WITH BROADENING OF THE
STRATIFORM REGION AS WELL. AS SUCH...THE TORNADO THREAT SHOULD HAVE
PEAKED EARLIER AND BE IN THE PROCESS OF DIMINISHING.
FARTHER E...ARCING BAND OF SEMI-DISCRETE STORMS MAY CONTINUE TO
SHIFT NEWD. HAVING RECENTLY INTERCEPTED THE AXIS OF A DEEPER MIXED
AIR MASS /CHARACTERIZED BY LOWER TO MIDDLE 50S SURFACE DEW
POINTS/...LOCALIZED DAMAGING WIND POTENTIAL HAS INCREASED PER 47 KT
GUST MEASURED AT KEVV AT 1945Z. THE SRN EXTENT OF THE THREAT INTO KY
APPEARS LIMITED IN THE NEAR-TERM BY LARGE-SCALE SUBSIDENCE...BUT
SHOULD EVENTUALLY INCREASE TOWARDS EARLY EVENING AS IMPULSE OVER NRN
AR /EVIDENT IN WATER VAPOR IMAGERY/ ROTATES EWD.
..GRAMS.. 03/23/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LMK...IWX...IND...PAH...LOT...ILX...
LAT...LON 38708834 39308863 39998860 40548858 41078851 41328803
41408742 41258683 40618623 39428580 38368597 37838623
36948700 37058761 37558741 38068734 38588746 38708834SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 23, 9:46 AM CDT | Mesoscale Discussion | SPC | Alexander, Clay, Crawford, Edwards, Franklin, Gallatin and 20 more | 119 min |
| Mar 23, 11:44 AM CDT | Severe Thunderstorm Watch | SPC | Alexander, Bond, Champaign, Christian, Clark, Clay and 36 more | 7 hr |
| Mar 23, 1:28 PM CDT | Mesoscale Discussion | SPC | Clark, Clay, Coles, Crawford, Cumberland, Edwards and 10 more | 62 min |
| Mar 23, 1:58 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Fulton, Greene and 12 more | 2 hr |
| Mar 23, 3:39 PM CDT | Severe Thunderstorm Watch | SPC | Ford, Iroquois, Kankakee | 4 hr |
| Mar 23, 6:43 PM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 18 more | 32 min |
| Mar 23, 5:08 PM CDT | Mesoscale Discussion | SPC | Bartholomew, Brown, Clark, Crawford, Dearborn, Decatur and 25 more | 37 min |
| Mar 23, 5:25 PM CDT | Tornado Watch | SPC | Bartholomew, Boone, Brown, Carroll, Clark, Clinton and 39 more | 7 hr |
Nearby
Mesoscale Discussions in Indiana, 2012Mesoscale Discussions in Illinois, 2012Mesoscale Discussions in Kentucky, 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.