Alert archive / Indiana / Mesoscale Discussions in 2011
Mesoscale Discussion 587
The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2011, 12:26 PM CDT for 4 states. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- Apr 26, 2011, 12:26 PM CDT (17:26 UTC)
- Expired
- Apr 26, 2011, 2:00 PM CDT
- In force
- 94 min
- Issued by
- the Storm Prediction Center
All 110 counties
Champaign County, IL, Clark County, IL, Douglas County, IL, Edgar County, IL, Ford County, IL, Iroquois County, IL, Vermilion County, IL, Adams County, IN, Allen County, IN, Bartholomew County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Brown County, IN, Carroll County, IN, Cass County, IN, Clay County, IN, Clinton County, IN, Dearborn County, IN, Decatur County, IN, DeKalb County, IN, Delaware County, IN, Elkhart County, IN, Fayette County, IN, Fountain County, IN, Franklin County, IN, Fulton County, IN, Grant County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Jay County, IN, Jennings County, IN, Johnson County, IN, Kosciusko County, IN, LaGrange County, IN, LaPorte County, IN, Madison County, IN, Marion County, IN, Marshall County, IN, Miami County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Newton County, IN, Noble County, IN, Owen County, IN, Parke County, IN, Pulaski County, IN, Putnam County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Saint Joseph County, IN, Shelby County, IN, Starke County, IN, Steuben County, IN, Sullivan County, IN, Tippecanoe County, IN, Tipton County, IN, Union County, IN, Vermillion County, IN, Vigo County, IN, Wabash County, IN, Warren County, IN, Wayne County, IN, Wells County, IN, White County, IN, Whitley County, IN, Barry County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clinton County, MI, Eaton County, MI, Hillsdale County, MI, Ingham County, MI, Ionia County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lenawee County, MI, Livingston County, MI, Monroe County, MI, Oakland County, MI, Saint Joseph County, MI, Shiawassee County, MI, Washtenaw County, MI, Allen County, OH, Auglaize County, OH, Darke County, OH, Defiance County, OH, Fulton County, OH, Hancock County, OH, Henry County, OH, Lucas County, OH, Mercer County, OH, Miami County, OH, Paulding County, OH, Preble County, OH, Putnam County, OH, Shelby County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH
The radar
The Northern Indiana radar (KIWX), 51 km from the middle of the area, began a volume at 17:30 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, 5.4 hours before the alert went out and 233 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
- 615 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 123 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
334
ACUS11 KWNS 261727
SWOMCD
SPC MCD 261726
OHZ000-MIZ000-KYZ000-INZ000-ILZ000-261900-
MESOSCALE DISCUSSION 0587
NWS STORM PREDICTION CENTER NORMAN OK
1226 PM CDT TUE APR 26 2011
AREAS AFFECTED...EASTERN IL INTO MUCH OF INDIANA/WESTERN OH AND
SOUTHERN LOWER MI
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 261726Z - 261900Z
THE SEVERE THREAT IS EXPECTED TO GRADUALLY INCREASE THROUGH THE
AFTERNOON FROM EASTERN IL INTO MUCH OF INDIANA/SOUTHERN LOWER MI AND
EVENTUALLY WESTERN OH. A WATCH MAY BE NEEDED FOR AT LEAST PORTIONS
OF THE REGION.
AS THE BRUNT OF A LEAD SHORTWAVE TROUGH CONTINUES TO PIVOT
NORTHEASTWARD TOWARD THE UPPER GREAT LAKES REGION...MIDDAY SURFACE
ANALYSIS REFLECTS A SURFACE LOW OVER THE UPPER MS VALLEY...WITH AN
ASSOCIATED COLD FRONT EXTENDING SOUTH-SOUTHWESTWARD INTO THE MIDDLE
MS VALLEY. ALONG/EAST OF A COLD FRONT AMID A REGION OF LOW LEVEL
CONFLUENCE...TSTMS ARE EXPECTED TO CONTINUE TO DEVELOP WITHIN AN
INCREASINGLY UNSTABLE/WEAKLY CAPPED BOUNDARY FROM EASTERN IL INTO
MUCH OF INDIANA/WESTERN OH AND SOUTHERN LOWER MI...WHERE MODEST
CLOUD BREAKS ARE OCCURRING COINCIDENT WITH UPPER 50S F SURFACE
DEWPOINTS. AS STORMS MATURE...STRONG LOW-MID TROPOSPHERIC
SOUTHWESTERLY FLOW WILL YIELD FAST NORTHEASTWARD-MOVING
TSTMS...INCLUDING A FEW SUPERCELLS/ORGANIZED LINE SEGMENTS...CAPABLE
OF DAMAGING WINDS/SEVERE HAIL AND PERHAPS A TORNADO. CONVECTIVE
TRENDS WILL CONTINUE TO BE MONITORED FOR THE POSSIBILITY OF A WATCH.
..GUYER.. 04/26/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CLE...ILN...DTX...IWX...GRR...IND...LOT...ILX...
LAT...LON 39028813 40498840 41428708 42508592 43338535 42958335
41298337 38988492 39028813SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 7:34 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hardin, Jackson, Johnson and 7 more | 116 min |
| Apr 25, 11:05 PM CDT | Mesoscale Discussion | SPC | Gallatin, Hardin, Massac, Pope, Saline, White | 115 min |
| Apr 26, 2:02 PM CDT | Tornado Watch | SPC | Champaign, Clark, Coles, Cumberland, Douglas, Edgar and 2 more | 7 hr |
| Apr 26, 2:41 PM CDT | Mesoscale Discussion | SPC | Massac | 94 min |
| Apr 26, 3:02 PM CDT | Tornado Watch | SPC | Hardin, Massac, Pope | 7 hr |
| Apr 26, 4:38 PM CDT | Mesoscale Discussion | SPC | Clark, Crawford, Edwards, Gallatin, Hamilton, Jasper and 5 more | 37 min |
| Apr 26, 4:50 PM CDT | Tornado Watch | SPC | Gallatin, Saline, Wabash, White | 5 hr |
| Apr 26, 6:17 PM CDT | Mesoscale Discussion | SPC | Alexander, Hardin, Johnson, Massac, Pope, Pulaski and 1 more | 118 min |
| Apr 26, 3:53 PM CDT | Mesoscale Discussion | SPC | Carroll, Cass, Elkhart, Fulton, Howard, Jasper and 13 more | 67 min |
Nearby
Mesoscale Discussions in Indiana, 2011Mesoscale Discussions in Michigan, 2011Mesoscale Discussions in Ohio, 2011Every mesoscale discussion in 2011
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.