Alert archive / Indiana / Mesoscale Discussions in 2004

Mesoscale Discussion 841

May 23, 200443 counties in Indiana; 12 counties in Michigan; 15 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at May 23, 2004, 9:45 AM EST for 43 counties in Indiana; 12 counties in Michigan; 15 counties in Ohio. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 23, 2004, 9:45 AM EST (14:45 UTC)
Expired
May 23, 2004, 11:45 AM EST
In force
2 hr
Issued by
the Storm Prediction Center
All 70 counties

Adams County, IN, Allen County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, DeKalb County, IN, Delaware County, IN, Elkhart 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, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Madison County, IN, Marshall County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Randolph County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Whitley County, IN, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Hillsdale County, MI, Jackson County, MI, Kalamazoo County, MI, Lenawee County, MI, Monroe County, MI, Saint Joseph County, MI, Washtenaw County, MI, Wayne County, MI, Allen County, OH, Auglaize County, OH, Defiance County, OH, Fulton County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Lucas County, OH, Mercer County, OH, Paulding County, OH, Putnam County, OH, Shelby County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH

The radar

The Northern Indiana radar (KIWX), 37 km from the middle of the area, began a volume at 14:49 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, 2.8 hours before the alert went out and 234 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 2004-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 957 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, Cncnati-Daytn, OH at 12:00Z on 2004-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 144 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
957 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
953 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
144 m²/s²
0-3 km storm-relative helicity
138 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.0

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
May 23, 10:10 AM ESTTornado WatchSPCAdams, Allen, Blackford, Carroll, Cass, Clinton and 21 more6 hr
May 23, 10:45 AM ESTTornado WatchSPCBartholomew, Brown, Clark, Clay, Crawford, Daviess and 35 more5 hr
May 23, 12:35 PM ESTMesoscale DiscussionSPCAdams, Allen, Blackford, Carroll, Cass, Clinton and 19 more115 min
May 23, 12:45 PM ESTMesoscale DiscussionSPCBartholomew, Brown, Clark, Clay, Crawford, Daviess and 33 more2 hr
May 23, 2:53 PM ESTMesoscale DiscussionSPCAdams, Allen, Benton, Blackford, Carroll, Cass and 29 more67 min
May 23, 3:50 PM ESTTornado WatchSPCAllen, Benton, Carroll, Cass, DeKalb, Elkhart and 21 more6 hr
May 23, 5:30 PM ESTTornado WatchSPCAdams, Bartholomew, Blackford, Boone, Brown, Clay and 41 more6 hr
May 23, 6:30 PM ESTMesoscale DiscussionSPCAllen, Benton, Carroll, Cass, DeKalb, Elkhart and 21 more2 hr

Nearby

Mesoscale Discussions in Indiana, 2004Mesoscale Discussions in Ohio, 2004Mesoscale Discussions in Michigan, 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.