Alert archive / Indiana / Mesoscale Discussions in 2004

Mesoscale Discussion 717

May 17, 20044 states

The Storm Prediction Center issued this mesoscale discussion at May 17, 2004, 10:22 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 17, 2004, 10:22 AM CDT (15:22 UTC)
Expired
May 17, 2004, 12:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 70 counties

Cook County, IL, Ford County, IL, Iroquois County, IL, Kankakee County, IL, Will County, IL, Allen County, IN, Benton 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, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Noble County, IN, Porter 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, Allegan County, MI, Barry County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clare County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gladwin County, MI, Gratiot County, MI, Hillsdale County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Livingston County, MI, Mecosta County, MI, Midland County, MI, Missaukee County, MI, Montcalm County, MI, Newaygo County, MI, Osceola County, MI, Ottawa County, MI, Roscommon County, MI, Saginaw County, MI, Saint Joseph County, MI, Shiawassee County, MI, Van Buren County, MI, Williams County, OH

The radar

The Northern Indiana radar (KIWX), 86 km from the middle of the area, began a volume at 15:22 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

Detroit, MI (KDTX), launched 12:00Z, 3.4 hours before the alert went out and 257 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 12:00Z on 2004-05-17Temperature 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, Detroit, MI at 12:00Z on 2004-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 188 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
694 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
188 m²/s²
0-3 km storm-relative helicity
252 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
May 17, 12:41 PM CDTMesoscale DiscussionSPCJo Daviess, Stephenson, Winnebago3 hr
May 17, 6:44 PM CDTMesoscale DiscussionSPCBoone, Jo Daviess, McHenry, Stephenson, Winnebago61 min
May 17, 12:05 PM CDTSevere Thunderstorm WatchSPCDeKalb, Elkhart, LaGrange, Noble, Saint Joseph, Steuben7 hr
May 17, 1:09 PM CDTMesoscale DiscussionSPCAdams, Bartholomew, Blackford, Brown, Clark, Crawford and 44 more2 hr
May 17, 3:05 PM CDTMesoscale DiscussionSPCDeKalb, Elkhart, LaGrange, Saint Joseph, Steuben85 min
May 17, 4:46 PM CDTMesoscale DiscussionSPCArenac, Bay, Clinton, Genesee, Gladwin, Gratiot and 19 more89 min
May 17, 1:45 PM CDTSevere Thunderstorm WatchSPCAshland, Crawford, Cuyahoga, Erie, Geauga, Hancock and 12 more5 hr
May 17, 4:23 PM CDTMesoscale DiscussionSPCAshland, Crawford, Cuyahoga, Erie, Geauga, Hancock and 12 more2 hr
May 17, 5:50 PM CDTMesoscale DiscussionSPCAshtabula, Columbiana, Geauga, Mahoning, Medina, Portage and 4 more85 min

Nearby

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