Alert archive / Indiana / Mesoscale Discussions in 2004

Mesoscale Discussion 1875

August 4, 200432 counties in Indiana; 10 counties in Michigan; Defiance County, Paulding County, Williams County, Ohio

The Storm Prediction Center issued this mesoscale discussion at Aug 4, 2004, 1:15 AM EST for 32 counties in Indiana; 10 counties in Michigan; Defiance County, Paulding County, Williams County, Ohio. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Aug 4, 2004, 1:15 AM EST (06:15 UTC)
Expired
Aug 4, 2004, 2:45 AM EST
In force
90 min
Issued by
the Storm Prediction Center
All 45 counties

Adams County, IN, Allen County, IN, Benton County, IN, Blackford County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Grant County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Jay County, IN, Kosciusko County, IN, LaGrange County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Noble County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Tippecanoe County, IN, Tipton County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Whitley County, IN, Branch County, MI, Calhoun County, MI, Cass County, MI, Hillsdale County, MI, Jackson County, MI, Kalamazoo County, MI, Lenawee County, MI, Saint Joseph County, MI, Van Buren County, MI, Washtenaw County, MI, Defiance County, OH, Paulding County, OH, Williams County, OH

The radar

The Northern Indiana radar (KIWX), 31 km from the middle of the area, began a volume at 06:18 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

Detroit, MI (KDTX), launched 00:00Z, 6.3 hours before the alert went out and 251 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, Detroit, MI at 00:00Z on 2004-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 137 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, Detroit, MI at 00:00Z on 2004-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 square meters per square second.19395878Sfc1 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
137 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
1253 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
89 m²/s²
0-3 km storm-relative helicity
155 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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, 5:44 AM ESTMesoscale DiscussionSPCAdams, Allen, Blackford, Boone, Carroll, Clay and 28 more2 hr
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 Michigan, 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.