Alert archive / Indiana / Mesoscale Discussions in 2011

Mesoscale Discussion 405

April 11, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2011, 12:48 AM CDT for 4 states. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Apr 11, 2011, 12:48 AM CDT (05:48 UTC)
Expired
Apr 11, 2011, 2:15 AM CDT
In force
87 min
Issued by
the Storm Prediction Center
All 57 counties

Bond 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, Effingham County, IL, Fayette County, IL, Jasper County, IL, Marion County, IL, Moultrie County, IL, Shelby County, IL, Vermilion County, IL, Allen County, IN, Benton County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clay County, IN, Clinton County, IN, DeKalb County, IN, Elkhart County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Hendricks County, IN, Howard County, IN, Huntington County, IN, Kosciusko County, IN, LaGrange County, IN, Marshall County, IN, Miami County, IN, Montgomery County, IN, Noble County, IN, Parke County, IN, Pulaski County, IN, Putnam County, IN, Steuben County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Vigo County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Whitley County, IN, Branch County, MI, Hillsdale County, MI, Lenawee County, MI, Saint Joseph County, MI, Defiance County, OH, Williams County, OH

The radar

The Indianapolis radar (KIND), 67 km from the middle of the area, began a volume at 05:50 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 nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 5.8 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.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2011-04-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1523 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2011-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 207 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1523 J/kg
Mixed-layer CIN
-79 J/kg
Mixed-layer LCL
1493 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
207 m²/s²
0-3 km storm-relative helicity
237 m²/s²
Significant tornado parameter
1.0
Supercell composite
6.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

590 
ACUS11 KWNS 110548
SWOMCD
SPC MCD 110548 
MIZ000-OHZ000-INZ000-ILZ000-110715-

MESOSCALE DISCUSSION 0405
NWS STORM PREDICTION CENTER NORMAN OK
1248 AM CDT MON APR 11 2011

AREAS AFFECTED...SCNTRL/SERN LOWER MI...NRN/CNTRL IND...ECNTRL IL

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 

VALID 110548Z - 110715Z

...SPORADIC DMGG WIND GUSTS AND HAIL POSSIBLE THROUGH 09Z...

AN ADDITIONAL WW DOWNSTREAM INTO LOWER MI...IND OR ECNTRL IL IS
UNLIKELY...LESS THAN 20 PERCENT...UNLESS THERE IS AN APPRECIABLE
UPTICK IN ACTIVITY.

TSTMS THAT MOVED OFF THE COLD FRONT CONTINUE TO TRANSLATE EWD INTO
AN ENVIRONMENT CHARACTERIZED BY DECREASING BUOYANCY AND VEERING
LOW-LEVEL WIND FLOW.  REGION IS LOCATED WITHIN ENTRANCE REGION OF A
MID-LEVEL JET WITH PRIMARY LARGE-SCALE SUPPORT PASSING THROUGH THE
CNTRL GREAT LAKES ATTM.  NONETHELESS...A DEEP UNIDIRECTIONAL AND
MODEST WSWLY FLOW REGIME AND SOMEWHAT DRY SUB-CLOUD LAYERS MAY YIELD
BRIEF INSTANCES OF BOWING LINE SEGMENTS GIVING SPORADIC DMGG WIND
GUSTS AND HAIL.  THIS ESPECIALLY WILL BE THE CASE ACROSS NRN IND
CLOSER TO THE UPPER SUPPORT.

..RACY.. 04/11/2011

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...DTX...IWX...GRR...IND...PAH...LOT...ILX...LSX...

LAT...LON   38579016 42268525 42108395 41328438 40498534 39628650
            38948784 38478886 38579016

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 10, 11:03 PM CDTMesoscale DiscussionSPCBond, Champaign, Christian, Coles, Cook, Cumberland and 18 more87 min
Apr 10, 8:17 PM CDTTornado WatchSPCAlger, Baraga, Chippewa, Delta, Dickinson, Luce and 4 more4 hr
Apr 10, 8:55 PM CDTMesoscale DiscussionSPCAlger, Alpena, Antrim, Benzie, Charlevoix, Cheboygan and 26 more95 min
Apr 11, 11:24 AM CDTMesoscale DiscussionSPCGallia, Lawrence, Meigs, Monroe, Washington36 min
Apr 11, 11:47 AM CDTTornado WatchSPCAthens, Gallia, Lawrence, Meigs, Washington6 hr
Apr 11, 2:44 PM CDTMesoscale DiscussionSPCAthens, Gallia, Lawrence, Meigs, Washington61 min

Nearby

Mesoscale Discussions in Indiana, 2011Mesoscale Discussions in Illinois, 2011Mesoscale Discussions in Michigan, 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.