Alert archive / Indiana / Mesoscale Discussions in 2004

Mesoscale Discussion 847

May 23, 20044 states

The Storm Prediction Center issued this mesoscale discussion at May 23, 2004, 2:53 PM CDT for 4 states. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
May 23, 2004, 2:53 PM CDT (19:53 UTC)
Expired
May 23, 2004, 4:00 PM CDT
In force
67 min
Issued by
the Storm Prediction Center
All 62 counties

Iroquois County, IL, Vermilion County, IL, 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, Fountain 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, Barry County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Eaton County, MI, Hillsdale County, MI, Ingham County, MI, Jackson County, MI, Kalamazoo County, MI, Lenawee County, MI, Livingston County, MI, Monroe County, MI, Saint Joseph County, MI, Washtenaw County, MI, Wayne County, MI, Defiance County, OH, Fulton County, OH, Henry County, OH, Lucas County, OH, Paulding County, OH, Putnam County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH

The radar

The Northern Indiana radar (KIWX), 28 km from the middle of the area, began a volume at 19:53 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

Lincoln, IL (KILX), launched 12:00Z, 7.9 hours before the alert went out and 252 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 12:00Z on 2004-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 435 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 12:00Z on 2004-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 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
435 J/kg
Mixed-layer CIN
-95 J/kg
Mixed-layer LCL
621 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
59 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 22, 8:58 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, DuPage, Grundy and 23 more92 min
May 23, 12:24 AM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 32 more66 min
May 23, 12:40 AM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 27 more5 hr
May 23, 1:21 AM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Greene, Jersey and 6 more24 min
May 23, 1:40 AM CDTSevere Thunderstorm WatchSPCAdams, Brown, Cass, Fulton, Hancock, Logan and 8 more4 hr
May 23, 4:30 AM CDTMesoscale DiscussionSPCAdams, Boone, Brown, Bureau, Carroll, Cass and 44 more60 min
May 23, 10:45 AM CDTTornado WatchSPCClark, Clay, Coles, Crawford, Cumberland, Edgar and 19 more5 hr
May 23, 12:25 PM CDTMesoscale DiscussionSPCAdams, Brown, Bureau, Calhoun, Carroll, Cass and 31 more95 min
May 23, 12:45 PM CDTMesoscale DiscussionSPCClark, Clay, Coles, Crawford, Cumberland, Edgar and 18 more2 hr
May 23, 1:15 PM CDTTornado WatchSPCAdams, Brown, Calhoun, Cass, Fulton, Greene and 16 more6 hr
May 23, 2:05 PM CDTTornado WatchSPCBoone, Bureau, Carroll, DeKalb, DuPage, Grundy and 18 more8 hr
May 23, 3:50 PM CDTTornado WatchSPCCook, DuPage, Iroquois, Kankakee, Vermilion, Will6 hr
May 23, 4:35 PM CDTSevere Thunderstorm WatchSPCMonroe5 hr
May 23, 5:00 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 28 more2 hr
May 23, 5:10 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, DuPage, Grundy and 17 more95 min
May 23, 5:30 PM CDTTornado WatchSPCBond, Calhoun, Christian, Clark, Clay, Clinton and 29 more6 hr
May 23, 6:30 PM CDTMesoscale DiscussionSPCCook, DuPage, Iroquois, Kankakee, Vermilion, Will2 hr
May 23, 9:45 AM CDTMesoscale DiscussionSPCAdams, Allen, Benton, Blackford, Boone, Carroll and 37 more2 hr
May 23, 10:10 AM CDTTornado WatchSPCAdams, Allen, Blackford, Carroll, Cass, Clinton and 21 more6 hr
May 23, 12:35 PM CDTMesoscale DiscussionSPCAdams, Allen, Blackford, Carroll, Cass, Clinton and 19 more115 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.