Alert archive / Indiana / Mesoscale Discussions in 2009

Mesoscale Discussion 841

May 15, 20095 states

The Storm Prediction Center issued this mesoscale discussion at May 15, 2009, 8:14 PM CDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 15, 2009, 8:14 PM CDT (01:14 UTC)
Expired: May 15, 2009, 10:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 124 counties

Bond County, IL, Champaign 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, Jasper County, IL, Jefferson County, IL, Lawrence County, IL, Madison County, IL, Marion County, IL, Montgomery County, IL, Moultrie County, IL, Piatt County, IL, Richland County, IL, Shelby County, IL, Vermilion County, IL, Wabash County, IL, Wayne County, IL, White 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, Clark County, IN, Clay County, IN, Clinton County, IN, Crawford County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Delaware County, IN, Dubois County, IN, Fayette County, IN, Floyd County, IN, Fountain County, IN, Franklin County, IN, Fulton County, IN, Gibson County, IN, Grant County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Harrison County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jackson County, IN, Jay County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Knox 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, Ohio County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Pike County, IN, Posey County, IN, Putnam County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Sullivan County, IN, Switzerland County, IN, Tippecanoe County, IN, Tipton County, IN, Union County, IN, Vanderburgh County, IN, Vermillion County, IN, Vigo County, IN, Wabash County, IN, Warren County, IN, Warrick County, IN, Washington County, IN, Wayne County, IN, Wells County, IN, White County, IN, Whitley County, IN, Boone County, KY, Carroll County, KY, Trimble County, KY, City of Saint Louis, MO, Saint Louis County, MO, Allen County, OH, Auglaize County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Darke County, OH, Greene County, OH, Hamilton County, OH, Hardin County, OH, Logan County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Preble County, OH, Shelby County, OH, Van Wert County, OH, Warren County, OH

The radar

The Indianapolis radar (KIND), 45 km from the middle of the area, began a volume at 01:17 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

Cncnati-Daytn, OH (KILN), launched 00:00Z, 1.2 hours before the alert went out and 236 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 850 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 1230 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 15, 10:28 PM CDT	Mesoscale Discussion	SPC	Adams, Bartholomew, Blackford, Boone, Brown, Clay and 31 more	2 hr
May 16, 1:46 PM CDT	Mesoscale Discussion	SPC	Adair, Boyd, Breathitt, Carter, Casey, Clay and 35 more	59 min
May 15, 10:39 PM CDT	Mesoscale Discussion	SPC	Crawford, Dade, Dent, Iron, Laclede, Madison and 6 more	2 hr
May 15, 10:55 PM CDT	Mesoscale Discussion	SPC	Barry, Christian, Greene, Lawrence, McDonald, Newton and 1 more	2 hr
May 16, 11:05 AM CDT	Mesoscale Discussion	SPC	Belmont, Jefferson, Monroe, Washington	55 min
May 16, 12:00 PM CDT	Severe Thunderstorm Watch	SPC	Belmont, Monroe	7 hr

Nearby

Mesoscale Discussions in Indiana, 2009 Mesoscale Discussions in Illinois, 2009 Mesoscale Discussions in Ohio, 2009 Every mesoscale discussion in 2009

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.