Alert archive / Michigan / Mesoscale Discussions in 2003

Mesoscale Discussion 2045

August 1, 2003LaGrange County, Steuben County, Indiana; 7 counties in Michigan; Fulton County, Williams County, Ohio

The Storm Prediction Center issued this mesoscale discussion at Aug 1, 2003, 1:45 PM EST for LaGrange County, Steuben County, Indiana; 7 counties in Michigan; Fulton County, Williams County, Ohio. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Aug 1, 2003, 1:45 PM EST (18:45 UTC)
Expired: Aug 1, 2003, 2:45 PM EST
In force: 60 min
Issued by: the Storm Prediction Center

Counties LaGrange County, IN, Steuben County, IN, Branch County, MI, Hillsdale County, MI, Lenawee County, MI, Monroe County, MI, Oakland County, MI, Saint Joseph County, MI, Washtenaw County, MI, Fulton County, OH, Williams County, OH

The radar

The Detroit radar (KDTX), 76 km from the middle of the area, began a volume at 18:49 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.

Severe Thunderstorm Watch 826Aug 1, 2:45 PM EST

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 6.8 hours before the alert went out and 80 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 212 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 1092 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 24 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.

Issued	Product	Office	Counties	Lasted
Aug 1, 9:45 AM EST	Severe Thunderstorm Watch	SPC	DeKalb, Elkhart, LaGrange, LaPorte, Marshall, Noble and 2 more	5 hr
Aug 1, 2:45 PM EST	Severe Thunderstorm Watch	SPC	Adams, Allen, Carroll, Cass, DeKalb, Elkhart and 18 more	6 hr
Aug 1, 6:34 PM EST	Mesoscale Discussion	SPC	Adams, Allen, Carroll, Cass, DeKalb, Elkhart and 18 more	86 min
Aug 1, 11:22 AM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Genesee, Hillsdale, Ingham, Jackson and 7 more	113 min

Nearby

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