Alert archive / Indiana / Mesoscale Discussions in 2004

Mesoscale Discussion 1878

August 4, 200434 counties in Indiana; 20 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Aug 4, 2004, 5:44 AM EST for 34 counties in Indiana; 20 counties in Ohio. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Aug 4, 2004, 5:44 AM EST (10:44 UTC)
Expired
Aug 4, 2004, 7:45 AM EST
In force
2 hr
Issued by
the Storm Prediction Center
All 54 counties

Adams County, IN, Allen County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Clay County, IN, Clinton County, IN, Delaware County, IN, Fayette County, IN, Fountain County, IN, Grant County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jay County, IN, Johnson County, IN, Madison County, IN, Marion County, IN, Montgomery County, IN, Morgan County, IN, Parke County, IN, Putnam County, IN, Randolph County, IN, Rush County, IN, Shelby County, IN, Tippecanoe County, IN, Tipton County, IN, Union County, IN, Warren County, IN, Wayne County, IN, Wells County, IN, Allen County, OH, Auglaize County, OH, Champaign County, OH, Clark County, OH, Crawford County, OH, Darke County, OH, Hancock County, OH, Hardin County, OH, Logan County, OH, Marion County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Paulding County, OH, Preble County, OH, Putnam County, OH, Shelby County, OH, Union County, OH, Van Wert County, OH, Wyandot County, OH

The radar

The Indianapolis radar (KIND), 114 km from the middle of the area, began a volume at 10:48 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, 10.7 hours before the alert went out and 287 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 2004-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4276 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 2004-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 square meters per square second.193958Sfc1 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
4276 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
860 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
138 m²/s²
Significant tornado parameter
2.0
Supercell composite
11.6

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
Aug 3, 7:38 PM ESTMesoscale DiscussionSPCBenton, Boone, Carroll, Cass, Clinton, Fountain and 22 more67 min
Aug 3, 7:55 PM ESTSevere Thunderstorm WatchSPCJasper, Lake, Newton, Porter5 hr
Aug 3, 10:35 PM ESTSevere Thunderstorm WatchSPCAdams, Allen, Benton, Blackford, Carroll, Cass and 26 more5 hr
Aug 3, 11:47 PM ESTMesoscale DiscussionSPCBenton, Carroll, Cass, Elkhart, Fulton, Kosciusko and 9 more58 min
Aug 4, 1:15 AM ESTMesoscale DiscussionSPCAdams, Allen, Benton, Blackford, Carroll, Cass and 26 more90 min
Aug 4, 1:01 PM ESTMesoscale DiscussionSPCClark, Crawford, Dubois, Floyd, Harrison, Jefferson and 7 more89 min
Aug 4, 1:30 PM ESTSevere Thunderstorm WatchSPCClark, Crawford, Floyd, Harrison, Perry6 hr
Aug 4, 3:39 PM ESTMesoscale DiscussionSPCClark, Crawford, Dubois, Floyd, Harrison, Perry and 3 more96 min
Aug 4, 9:39 AM ESTMesoscale DiscussionSPCAdams, Ashland, Athens, Belmont, Brown, Carroll and 43 more2 hr
Aug 4, 10:55 AM ESTSevere Thunderstorm WatchSPCAdams, Athens, Belmont, Carroll, Columbiana, Coshocton and 24 more5 hr
Aug 4, 1:31 PM ESTMesoscale DiscussionSPCAdams, Gallia, Jackson, Lawrence, Meigs, Scioto119 min

Nearby

Mesoscale Discussions in Indiana, 2004Mesoscale Discussions in Ohio, 2004Every mesoscale discussion in 2004

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.