Alert archive / Indiana / Mesoscale Discussions in 2005

Mesoscale Discussion 1820

July 21, 20055 counties in Illinois; 51 counties in Indiana; Darke County, Mercer County, Preble County, Ohio

The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2005, 7:32 PM CDT for 5 counties in Illinois; 51 counties in Indiana; Darke County, Mercer County, Preble County, Ohio. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Jul 21, 2005, 7:32 PM CDT (00:32 UTC)
Expired: Jul 21, 2005, 9:30 PM CDT
In force: 118 min
Issued by: the Storm Prediction Center

All 59 counties

Champaign County, IL, Edgar County, IL, Ford County, IL, Iroquois County, IL, Vermilion County, IL, Adams 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, Decatur County, IN, Delaware County, IN, Fayette County, IN, Fountain County, IN, Franklin County, IN, Fulton County, IN, Grant 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, Johnson County, IN, Kosciusko County, IN, Madison County, IN, Marion County, IN, Miami County, IN, Montgomery County, IN, Morgan County, IN, Newton County, IN, Owen County, IN, Parke County, IN, Pulaski County, IN, Putnam County, IN, Randolph County, IN, Rush County, IN, Shelby 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, Darke County, OH, Mercer County, OH, Preble County, OH

The radar

The Indianapolis radar (KIND), 66 km from the middle of the area, began a volume at 00:34 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, 0.5 hours before the alert went out and 194 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: 3002 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1539 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 143 m²/s²
0-3 km storm-relative helicity: 257 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 20.1

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
Jul 21, 9:25 PM CDT	Severe Thunderstorm Watch	SPC	Clark, Coles, Crawford, Cumberland, Douglas, Edgar and 3 more	5 hr
Jul 21, 10:07 PM CDT	Mesoscale Discussion	SPC	Clark, Coles, Crawford, Cumberland, Douglas, Edgar and 5 more	83 min
Jul 21, 10:55 PM CDT	Severe Thunderstorm Watch	SPC	Clark, Dearborn, Decatur, Fayette, Floyd, Franklin and 10 more	4 hr
Jul 22, 1:20 AM CDT	Mesoscale Discussion	SPC	Brown, Clermont, Clinton, Greene, Highland, Montgomery and 1 more	85 min

Nearby

Mesoscale Discussions in Indiana, 2005 Mesoscale Discussions in Illinois, 2005 Mesoscale Discussions in Ohio, 2005 Every mesoscale discussion in 2005

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.