Alert archive / Michigan / Mesoscale Discussions in 2003

Mesoscale Discussion 1914

July 20, 2003Steuben County, Indiana; 27 counties in Michigan; 7 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2003, 3:37 PM EST for Steuben County, Indiana; 27 counties in Michigan; 7 counties in Ohio. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
Jul 20, 2003, 3:37 PM EST (20:37 UTC)
Expired
Jul 20, 2003, 5:30 PM EST
In force
113 min
Issued by
the Storm Prediction Center
All 35 counties

Steuben County, IN, Alcona County, MI, Alpena County, MI, Arenac County, MI, Bay County, MI, Crawford County, MI, Genesee County, MI, Gladwin County, MI, Hillsdale County, MI, Huron County, MI, Ingham County, MI, Iosco County, MI, Jackson County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Midland County, MI, Monroe County, MI, Montmorency County, MI, Oakland County, MI, Ogemaw County, MI, Oscoda County, MI, Roscommon County, MI, Saginaw County, MI, Shiawassee County, MI, Tuscola County, MI, Washtenaw County, MI, Wayne County, MI, Defiance County, OH, Fulton County, OH, Henry County, OH, Lucas County, OH, Sandusky County, OH, Williams County, OH, Wood County, OH

The radar

The Detroit radar (KDTX), 82 km from the middle of the area, began a volume at 20:39 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, 8.6 hours before the alert went out and 82 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 2003-07-20Temperature 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 2003-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 92 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1593 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
92 m²/s²
0-3 km storm-relative helicity
118 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, 12:41 PM ESTMesoscale DiscussionSPCSteuben64 min
Jul 20, 1:20 PM ESTSevere Thunderstorm WatchSPCDeKalb, Steuben6 hr
Jul 20, 4:25 PM ESTSevere Thunderstorm WatchSPCJasper, Lake, Newton, Porter5 hr
Jul 20, 6:23 PM ESTMesoscale DiscussionSPCElkhart, Fulton, Jasper, Kosciusko, LaGrange, Lake and 10 more97 min
Jul 20, 6:45 PM ESTSevere Thunderstorm WatchSPCDeKalb, Elkhart, Kosciusko, LaGrange, LaPorte, Marshall and 5 more5 hr
Jul 20, 1:16 PM ESTMesoscale DiscussionSPCAlger, Baraga, Dickinson, Gogebic, Houghton, Iron and 3 more119 min
Jul 20, 1:55 PM ESTSevere Thunderstorm WatchSPCAlger, Baraga, Delta, Dickinson, Gogebic, Houghton and 4 more7 hr
Jul 20, 3:27 PM ESTMesoscale DiscussionSPCAlger, Baraga, Delta, Dickinson, Gogebic, Houghton and 4 more63 min
Jul 20, 6:47 PM ESTMesoscale DiscussionSPCBaraga, Delta, Dickinson, Gogebic, Houghton, Iron and 3 more88 min

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.