Alert archive / Illinois / Mesoscale Discussions in 2012
Mesoscale Discussion 202
The Storm Prediction Center issued this mesoscale discussion at Mar 2, 2012, 4:25 AM CST for 36 counties in Illinois; 10 counties in Indiana; 4 counties in Missouri. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Mar 2, 2012, 4:25 AM CST (10:25 UTC)
- Expired
- Mar 2, 2012, 6:00 AM CST
- In force
- 95 min
- Issued by
- the Storm Prediction Center
All 50 counties
Bond County, IL, Calhoun County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Greene County, IL, Hamilton County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Lawrence County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Moultrie County, IL, Perry County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Shelby County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Clay County, IN, Daviess County, IN, Gibson County, IN, Greene County, IN, Knox County, IN, Martin County, IN, Owen County, IN, Pike County, IN, Sullivan County, IN, Vigo County, IN, City of Saint Louis, MO, Jefferson County, MO, Saint Charles County, MO, Saint Louis County, MO
The radar
The Evansville,IN radar (KVWX), 127 km from the middle of the area, began a volume at 10:25 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 00:00Z, 10.4 hours before the alert went out and 142 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
- 2012 m above ground
- 0-6 km bulk shear
- 70 kt
- 0-1 km storm-relative helicity
- 130 m²/s²
- 0-3 km storm-relative helicity
- 380 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
864
ACUS11 KWNS 021025
SWOMCD
SPC MCD 021025
INZ000-ILZ000-MOZ000-021200-
MESOSCALE DISCUSSION 0202
NWS STORM PREDICTION CENTER NORMAN OK
0425 AM CST FRI MAR 02 2012
AREAS AFFECTED...ERN MO...SCNTRL IL AND SW IND
CONCERNING...SEVERE THUNDERSTORM WATCH 54...
VALID 021025Z - 021200Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 54
CONTINUES.
A THREAT FOR LARGE HAIL AND ISOLATED WIND DAMAGE WILL INCREASE
ACROSS THE ST LOUIS AREA ENEWD ACROSS SCNTRL IL AND SW IND. WW
ISSUANCE WILL LIKELY BE NEEDED EAST OF THE CURRENT WW 54 BEFORE 12Z.
A CLUSTER OF SEVERE THUNDERSTORMS IN CNTRL MO IS LOCATED ON A
WELL-DEFINED WARM FRONT EXTENDING EWD ACROSS CNTRL MO TO THE
NORTHEAST OF A 994 MB SFC LOW. THE STORMS ARE BEING SUPPORTED BY A
SUBTLE SHORTWAVE TROUGH EVIDENT IN WATER VAPOR IMAGERY MOVING
THROUGH SW MO. STRONG LIFT ASSOCIATED WITH THE SHORTWAVE TROUGH AND
ELEVATED INSTABILITY SHOULD SUPPORT STRONG CONVECTION ENEWD ACROSS
SCNTRL IL EARLY THIS MORNING. FORECAST SOUNDINGS AROUND ST LOUIS AND
IN MT VERNON IL SHOW MUCAPE VALUES AROUND 1000 J/KG WITH EFFECTIVE
SHEAR OF 40 TO 50 KT. THIS COMBINED WITH MID-LEVEL LAPSE RATES
AROUND 7.5 C/KM SHOULD BE FAVORABLE FOR LARGE HAIL WITH THE MORE
INTENSE CORES. A WIND DAMAGE THREAT MAY ALSO EXIST BUT SHOULD BE
KEPT ISOLATED DUE TO A COOL STABLE BOUNDARY LAYER.
..BROYLES.. 03/02/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LMK...IND...PAH...ILX...LSX...
LAT...LON 38929100 37959067 37928886 38268695 38948667 39678698
39938787 39599044 38929100SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 2, 1:46 AM CST | Mesoscale Discussion | SPC | Jackson, Monroe, Perry, Randolph, Saint Clair | 89 min |
| Mar 2, 2:07 AM CST | Severe Thunderstorm Watch | SPC | Calhoun, Jersey, Madison, Monroe, Randolph, Saint Clair | 5 hr |
| Mar 2, 5:52 AM CST | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Champaign, Christian, Clark, Clay and 29 more | 6 hr |
| Mar 2, 7:50 AM CST | Mesoscale Discussion | SPC | Clark, Clay, Coles, Crawford, Cumberland, Douglas and 12 more | 85 min |
| Mar 2, 9:22 AM CST | Mesoscale Discussion | SPC | Alexander, Crawford, Edwards, Franklin, Gallatin, Hamilton and 13 more | 113 min |
| Mar 2, 9:54 AM CST | Tornado Watch | SPC | Alexander, Bond, Champaign, Christian, Clark, Clay and 41 more | 6 hr |
| Mar 2, 10:02 AM CST | Mesoscale Discussion | SPC | Champaign, Clark, Coles, Crawford, Cumberland, Douglas and 3 more | 88 min |
| Mar 2, 11:06 AM CST | Mesoscale Discussion | SPC | Boone, Carroll, Hancock, Henderson, Henry, Jo Daviess and 9 more | 4 hr |
| Mar 2, 12:05 PM CST | Mesoscale Discussion | SPC | Gallatin, Hardin, Johnson, Massac, Pope, Saline and 2 more | 85 min |
| Mar 2, 3:40 AM CST | Mesoscale Discussion | SPC | Crawford, Dubois, Harrison, Perry, Pike, Spencer and 1 more | 65 min |
| Mar 2, 10:30 AM CST | Mesoscale Discussion | SPC | Adams, Blackford, Dearborn, Delaware, Fayette, Franklin and 7 more | 90 min |
| Mar 2, 12:02 PM CST | Tornado Watch | SPC | Bartholomew, Brown, Clark, Crawford, Dearborn, Decatur and 25 more | 8 hr |
| Mar 2, 2:35 PM CST | Mesoscale Discussion | SPC | Clark, Dearborn, Floyd, Franklin, Harrison, Jefferson and 4 more | 85 min |
| Mar 2, 10:28 AM CST | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 62 min |
Nearby
Mesoscale Discussions in Illinois, 2012Mesoscale Discussions in Indiana, 2012Mesoscale Discussions in Missouri, 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.