Alert archive / Michigan / Mesoscale Discussions in 2003

Mesoscale Discussion 1603

July 4, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2003, 9:28 AM EST for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 4, 2003, 9:28 AM EST (14:28 UTC)
Expired
Jul 4, 2003, 11:30 AM EST
In force
2 hr
Issued by
the Storm Prediction Center
All 51 counties

DeKalb County, IN, Elkhart County, IN, Kosciusko County, IN, LaGrange County, IN, Noble County, IN, Steuben County, IN, Barry County, MI, Branch County, MI, Calhoun County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gratiot County, MI, Hillsdale County, MI, Huron County, MI, Ingham County, MI, Ionia County, MI, Jackson 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, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI, Washtenaw County, MI, Wayne County, MI, Ashtabula County, OH, Cuyahoga County, OH, Defiance County, OH, Erie County, OH, Fulton County, OH, Geauga County, OH, Henry County, OH, Huron County, OH, Lake County, OH, Lorain County, OH, Lucas County, OH, Medina County, OH, Ottawa County, OH, Paulding County, OH, Sandusky County, OH, Seneca County, OH, Williams County, OH, Wood County, OH, Erie County, PA

The radar

The Detroit radar (KDTX), 40 km from the middle of the area, began a volume at 14:31 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, 2.5 hours before the alert went out and 43 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 2003-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 849 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 2003-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 64 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
849 J/kg
Mixed-layer CIN
-66 J/kg
Mixed-layer LCL
1097 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
64 m²/s²
0-3 km storm-relative helicity
78 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 4, 7:50 AM ESTSevere Thunderstorm WatchSPCElkhart, LaGrange, LaPorte, Saint Joseph, Steuben3 hr
Jul 4, 12:04 PM ESTMesoscale DiscussionSPCAllen, DeKalb, Elkhart, Kosciusko, LaGrange, LaPorte and 7 more116 min
Jul 4, 12:48 PM ESTMesoscale DiscussionSPCCarroll, Cass, Elkhart, Fulton, Grant, Jasper and 15 more117 min
Jul 4, 1:45 PM ESTMesoscale DiscussionSPCAdams, Allen, DeKalb, Whitley60 min
Jul 4, 2:20 PM ESTSevere Thunderstorm WatchSPCAdams, Allen, Benton, Blackford, Boone, Carroll and 36 more6 hr
Jul 4, 3:29 PM ESTMesoscale DiscussionSPCAdams, Allen, Benton, Blackford, Boone, Carroll and 28 more2 hr
Jul 4, 5:07 PM ESTMesoscale DiscussionSPCBartholomew, Brown, Clark, Clay, Crawford, Daviess and 37 more53 min
Jul 4, 5:50 PM ESTSevere Thunderstorm WatchSPCBartholomew, Brown, Clay, Daviess, Dearborn, Decatur and 29 more5 hr
Jul 4, 6:29 PM ESTMesoscale DiscussionSPCAdams, Allen, Benton, Blackford, Boone, Carroll and 45 more61 min
Jul 4, 7:25 AM ESTMesoscale DiscussionSPCAllegan, Barry, Benzie, Cass, Kalamazoo, Kent and 12 more95 min
Jul 4, 9:45 AM ESTSevere Thunderstorm WatchSPCClinton, Genesee, Gratiot, Hillsdale, Ingham, Jackson and 11 more5 hr
Jul 4, 2:05 PM ESTSevere Thunderstorm WatchSPCAllen, Ashland, Auglaize, Carroll, Champaign, Clark and 47 more6 hr

Nearby

Mesoscale Discussions in Michigan, 2003Mesoscale Discussions in Ohio, 2003Mesoscale Discussions in Indiana, 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.