Alert archive / Illinois / Mesoscale Discussions in 2012
Mesoscale Discussion 332
The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2012, 9:46 AM CDT for 4 states. It was in force for 119 min.
The area
The outline as issued.
The facts
- Issued
- Mar 23, 2012, 9:46 AM CDT (14:46 UTC)
- Expired
- Mar 23, 2012, 11:45 AM CDT
- In force
- 119 min
- Issued by
- the Storm Prediction Center
All 60 counties
Alexander County, IL, Clay County, IL, Crawford County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Johnson County, IL, Lawrence County, IL, Marion County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Richland County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Daviess County, IN, Dubois County, IN, Gibson County, IN, Greene County, IN, Knox County, IN, Martin County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Sullivan County, IN, Vanderburgh County, IN, Warrick County, IN, Ballard County, KY, Caldwell County, KY, Carlisle County, KY, Crittenden County, KY, Daviess County, KY, Fulton County, KY, Henderson County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Union County, KY, Webster County, KY, Cape Girardeau County, MO, Mississippi County, MO, New Madrid County, MO, Perry County, MO, Scott County, MO, Stoddard County, MO
The radar
The Evansville,IN radar (KVWX), 88 km from the middle of the area, began a volume at 15:02 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, 2.8 hours before the alert went out and 256 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.
713
ACUS11 KWNS 231447
SWOMCD
SPC MCD 231446
INZ000-KYZ000-ILZ000-TNZ000-MOZ000-231645-
MESOSCALE DISCUSSION 0332
NWS STORM PREDICTION CENTER NORMAN OK
0946 AM CDT FRI MAR 23 2012
AREAS AFFECTED...PARTS OF THE LOWER OH VALLEY
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 231446Z - 231645Z
TSTMS DEVELOPING ALONG THE MO/IL BORDER MAY INTENSIFY AND INCREASE
IN COVERAGE ACROSS PARTS OF THE LOWER OH VALLEY INTO THIS AFTERNOON.
PRIMARY RISK SHOULD BE LARGE HAIL. THE PROBABILITY OF A WW ISSUANCE
BY 1645Z IS 60 PERCENT.
A FEW TSTMS HAVE INTENSIFIED DURING THE PAST HALF HOUR INVOF SERN
MO/FAR SRN IL BORDER IMMEDIATELY AHEAD OF AN UPPER-LEVEL IMPULSE
OVER NRN AR /EVIDENT IN WATER VAPOR IMAGERY/. BREAKS IN THE CLOUD
COVERAGE DOWNSTREAM OF THIS ACTIVITY SHOULD AID IN BOOSTING MLCAPE
TO BETWEEN 500-1000 J/KG BY MIDDAY. ALTHOUGH WIND PROFILES WILL
LIKELY EXHIBIT SOME BACKING BETWEEN 850-700 MB...STRONG DEEP-LAYER
SPEED SHEAR /AS SAMPLED BY THE PAH VWP/ SHOULD SUPPORT EFFECTIVE
SHEAR AROUND 40-45 KT. WITH STEEP MID-LEVEL LAPSE RATES OF AROUND 8
DEG C/KM PER 12Z SGF/LZK RAOBS...LARGE HAIL WILL BE THE PRIMARY
THREAT INITIALLY.
..GRAMS.. 03/23/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LMK...IND...PAH...ILX...MEG...LSX...
LAT...LON 36939003 37668992 38538929 38888862 39238806 39318742
39148686 38768658 37948686 37248742 36518924 36408988
36438999 36939003SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 3:17 PM CDT | Mesoscale Discussion | SPC | Champaign, Clark, Coles, Crawford, Cumberland, Douglas and 9 more | 58 min |
| 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 Illinois, 2012Mesoscale Discussions in Kentucky, 2012Mesoscale Discussions in Indiana, 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.