Alert archive / Michigan / Mesoscale Discussions in 2003

Mesoscale Discussion 1945

July 21, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2003, 3:26 PM CDT for 4 states. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
Jul 21, 2003, 3:26 PM CDT (20:26 UTC)
Expired
Jul 21, 2003, 5:00 PM CDT
In force
94 min
Issued by
the Storm Prediction Center
All 50 counties

Cook County, IL, Allen County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Whitley County, IN, Allegan County, MI, Barry County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Hillsdale County, MI, Ingham County, MI, Ionia County, MI, Jackson County, MI, Kalamazoo County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Oakland County, MI, Saginaw County, MI, Saint Clair County, MI, Saint Joseph County, MI, Shiawassee County, MI, Tuscola County, MI, Van Buren County, MI, Washtenaw County, MI, Wayne County, MI, Defiance County, OH, Fulton County, OH, Williams County, OH

The radar

The Grand Rapids radar (KGRR), 82 km from the middle of the area, began a volume at 20:28 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 12:00Z, 8.4 hours before the alert went out and 142 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 2003-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 140 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 12:00Z on 2003-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 11 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
140 J/kg
Mixed-layer CIN
-101 J/kg
Mixed-layer LCL
1071 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
11 m²/s²
0-3 km storm-relative helicity
44 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
Jul 20, 8:08 PM CDTMesoscale DiscussionSPCBureau, Carroll, Fulton, Hancock, Henderson, Henry and 15 more2 hr
Jul 20, 8:30 PM CDTTornado WatchSPCCarroll, Henry, Jo Daviess, Mercer, Rock Island, Whiteside6 hr
Jul 20, 9:48 PM CDTMesoscale DiscussionSPCBoone, Bureau, Cook, DeKalb, DuPage, Grundy and 12 more117 min
Jul 20, 10:15 PM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Cook, DeKalb, DuPage, Grundy and 12 more7 hr
Jul 20, 11:14 PM CDTMesoscale DiscussionSPCAdams, Brown, Cass, Champaign, DeWitt, Ford and 29 more2 hr
Jul 20, 11:30 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Cass, Champaign, DeWitt, Douglas and 21 more6 hr
Jul 21, 1:56 AM CDTMesoscale DiscussionSPCChampaign, Douglas, Edgar, Ford, Iroquois, Macon and 2 more2 hr
Jul 21, 4:12 AM CDTMesoscale DiscussionSPCClay, Crawford, Edwards, Effingham, Franklin, Hamilton and 7 more2 hr
Jul 20, 9:39 PM CDTMesoscale DiscussionSPCElkhart, Kosciusko, LaGrange, LaPorte, Marshall, Noble and 3 more66 min
Jul 20, 11:45 PM CDTSevere Thunderstorm WatchSPCAllen, DeKalb, Elkhart, Fulton, Huntington, Kosciusko and 11 more5 hr
Jul 21, 3:15 AM CDTSevere Thunderstorm WatchSPCAdams, Allen, Benton, Blackford, Boone, Carroll and 47 more6 hr
Jul 21, 5:03 AM CDTMesoscale DiscussionSPCBartholomew, Brown, Clark, Crawford, Daviess, Dearborn and 17 more117 min
Jul 21, 5:10 AM CDTSevere Thunderstorm WatchSPCDearborn, Decatur, Fayette, Franklin, Jay, Jefferson and 9 more6 hr
Jul 21, 10:27 AM CDTMesoscale DiscussionSPCBartholomew, Brown, Clark, Crawford, Daviess, Dearborn and 29 more2 hr
Jul 21, 9:59 AM CDTMesoscale DiscussionSPCAllegan, Barry, Bay, Clare, Clinton, Eaton and 21 more2 hr
Jul 21, 1:11 AM CDTMesoscale DiscussionSPCAllen, Ashland, Crawford, Cuyahoga, Erie, Geauga and 24 more2 hr
Jul 21, 6:39 AM CDTMesoscale DiscussionSPCAdams, Athens, Brown, Carroll, Coshocton, Delaware and 29 more96 min
Jul 21, 7:40 AM CDTSevere Thunderstorm WatchSPCAthens, Belmont, Carroll, Columbiana, Gallia, Guernsey and 17 more5 hr

Nearby

Mesoscale Discussions in Michigan, 2003Mesoscale Discussions in Indiana, 2003Mesoscale Discussions in Ohio, 2003Every mesoscale discussion in 2003

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.