Alert archive / Indiana / Mesoscale Discussions in 2005

Mesoscale Discussion 606

April 20, 20056 counties in Illinois; 30 counties in Indiana; 15 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Apr 20, 2005, 12:21 PM CDT for 6 counties in Illinois; 30 counties in Indiana; 15 counties in Ohio. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
Apr 20, 2005, 12:21 PM CDT (17:21 UTC)
Expired
Apr 20, 2005, 2:15 PM CDT
In force
114 min
Issued by
the Storm Prediction Center
All 51 counties

Champaign County, IL, Douglas County, IL, Ford County, IL, Iroquois County, IL, Piatt County, IL, Vermilion County, IL, Adams County, IN, Allen County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Delaware County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Jay County, IN, Madison County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Pulaski County, IN, Randolph County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Allen County, OH, Auglaize County, OH, Crawford County, OH, Darke County, OH, Hancock County, OH, Hardin County, OH, Logan County, OH, Marion County, OH, Mercer County, OH, Paulding County, OH, Putnam County, OH, Seneca County, OH, Shelby County, OH, Van Wert County, OH, Wyandot County, OH

The radar

The Northern Indiana radar (KIWX), 72 km from the middle of the area, began a volume at 17:24 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

Cncnati-Daytn, OH (KILN), launched 12:00Z, 5.4 hours before the alert went out and 230 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, Cncnati-Daytn, OH at 12:00Z on 2005-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Cncnati-Daytn, OH at 12:00Z on 2005-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -29 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1989 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-29 m²/s²
0-3 km storm-relative helicity
12 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

IssuedProductOfficeCountiesLasted
Apr 20, 1:52 PM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Fulton, Greene and 13 more113 min
Apr 20, 5:07 PM CDTMesoscale DiscussionSPCClinton, Franklin, Jackson, Jefferson, Madison, Monroe and 5 more113 min
Apr 20, 12:50 PM CDTSevere Thunderstorm WatchSPCAdams, Allen, Benton, Blackford, Boone, Carroll and 26 more6 hr
Apr 20, 3:19 PM CDTMesoscale DiscussionSPCAdams, Blackford, Carroll, Cass, Grant, Howard and 7 more86 min
Apr 20, 5:37 PM CDTMesoscale DiscussionSPCAdams, Benton, Blackford, Boone, Carroll, Cass and 20 more83 min
Apr 20, 2:05 PM CDTMesoscale DiscussionSPCAshtabula, Carroll, Columbiana, Coshocton, Cuyahoga, Geauga and 11 more85 min
Apr 20, 2:35 PM CDTSevere Thunderstorm WatchSPCCarroll, Columbiana, Coshocton, Geauga, Harrison, Holmes and 9 more4 hr

Nearby

Mesoscale Discussions in Indiana, 2005Mesoscale Discussions in Ohio, 2005Mesoscale Discussions in Illinois, 2005Every 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.