Alert archive / Indiana / Mesoscale Discussions in 2012
Mesoscale Discussion 50
The Storm Prediction Center issued this mesoscale discussion at Jan 22, 2012, 8:25 PM CST for 27 counties in Illinois; 41 counties in Indiana. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jan 22, 2012, 8:25 PM CST (02:25 UTC)
- Expired
- Jan 22, 2012, 10:30 PM CST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 68 counties
Bond County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Ford County, IL, Iroquois County, IL, Jasper County, IL, Kankakee County, IL, Lawrence County, IL, Macon County, IL, Marion County, IL, McLean County, IL, Montgomery County, IL, Moultrie County, IL, Piatt County, IL, Richland County, IL, Shelby County, IL, Vermilion County, IL, Bartholomew County, IN, Benton County, IN, Boone County, IN, Brown County, IN, Carroll County, IN, Cass County, IN, Clay County, IN, Clinton County, IN, Daviess County, IN, Fountain County, IN, Grant County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Howard County, IN, Jasper County, IN, Johnson County, IN, Knox County, IN, Lake County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Miami County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Newton County, IN, Owen County, IN, Parke County, IN, Pulaski County, IN, Putnam County, IN, Shelby County, IN, Sullivan County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, White County, IN
The radar
The Indianapolis radar (KIND), 97 km from the middle of the area, began a volume at 02:26 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, 2.4 hours before the alert went out and 110 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
- 3 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 378 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 494 m²/s²
- 0-3 km storm-relative helicity
- 471 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
601
ACUS11 KWNS 230225
SWOMCD
SPC MCD 230225
INZ000-ILZ000-230430-
MESOSCALE DISCUSSION 0050
NWS STORM PREDICTION CENTER NORMAN OK
0825 PM CST SUN JAN 22 2012
AREAS AFFECTED...CNTRL/ERN IL AND WRN/CNTRL IND
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 230225Z - 230430Z
THUNDERSTORMS WILL INCREASE IN COVERAGE ACROSS CNTRL/ERN IL AND
WRN/CNTRL IND TONIGHT. MARGINAL SVR WEATHER THREAT WILL EXIST WITH
THIS ACTIVITY...ENVIRONMENTAL TRENDS WILL CONTINUE TO BE MONITORED
FOR A WW.
AT 02Z...A 996 MB SURFACE LOW WAS MOVING FROM ERN KS INTO WRN
MO...AND IS FORECAST TO TRACK NEWD INTO NRN IL DURING THE OVERNIGHT
HOURS. STRONG SLY LOW-LEVEL FLOW AHEAD OF THE CYCLONE WILL CONTINUE
TO AID IN THE NWD ADVECTION OF MOISTURE /AROUND 8-10 C AT 850 MB/
ABOVE A COOL STABLE SURFACE AIRMASS /TEMPERATURES RANGING FROM NEAR
40F OVER NRN IND TO AROUND 60F OVER SRN IL AND SRN IND/. AS STRONG
FORCING FOR ASCENT CONTINUES TO OVERSPREAD THE REGION THROUGH
06Z...HI-RES MODEL GUIDANCE SUGGESTS STORMS WILL EXPAND IN COVERAGE
NWD OUT OF SRN IL INTO PORTIONS OF CNTRL/ERN IL...AND THEN MOVE EWD
INTO WRN/CNTRL IND. IT IS QUESTIONABLE WHETHER ROBUST BOUNDARY LAYER
DESTABILIZATION WILL OCCUR OVER IL/IND...WHICH WOULD BE PROBLEMATIC
FOR AN APPRECIABLE SVR WEATHER RISK. HOWEVER...GIVEN THE
STRONG/DYNAMIC NATURE OF THE EJECTING CYCLONE...OBSERVATIONAL TRENDS
WILL BE MONITORED CLOSELY DURING THE NIGHT FOR SIGNS OF GREATER THAN
ANTICIPATED DESTABILIZATION.
..GARNER.. 01/23/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...IWX...IND...PAH...LOT...ILX...LSX...
LAT...LON 40548549 39078586 38478717 38478912 39098966 40428917
41538734 40548549SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 22, 7:28 PM CST | Tornado Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 5 hr |
| Jan 22, 8:37 PM CST | Mesoscale Discussion | SPC | Alexander, Franklin, Hamilton, Jackson, Jefferson, Johnson and 9 more | 83 min |
| Jan 22, 10:49 PM CST | Mesoscale Discussion | SPC | Clark, Crawford, Edwards, Gallatin, Hardin, Lawrence and 2 more | 86 min |
| Jan 22, 11:34 PM CST | Severe Thunderstorm Watch | SPC | Bartholomew, Brown, Clark, Clay, Crawford, Daviess and 15 more | 3 hr |
| Jan 23, 12:52 AM CST | Mesoscale Discussion | SPC | Bartholomew, Brown, Clark, Dearborn, Decatur, Fayette and 16 more | 113 min |
| Jan 23, 1:14 AM CST | Severe Thunderstorm Watch | SPC | Dearborn, Franklin, Ohio, Ripley, Switzerland | 5 hr |
Nearby
Mesoscale Discussions in Indiana, 2012Mesoscale Discussions in Illinois, 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.