Alert archive / Indiana / Mesoscale Discussions in 2007

Mesoscale Discussion 1843

August 22, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Aug 22, 2007, 4:53 AM CDT for 4 states. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Aug 22, 2007, 4:53 AM CDT (09:53 UTC)
Expired: Aug 22, 2007, 6:00 AM CDT
In force: 67 min
Issued by: the Storm Prediction Center

All 53 counties

Kankakee County, IL, Will County, IL, Adams County, IN, Allen County, IN, Blackford County, IN, Carroll County, IN, Cass County, IN, DeKalb County, IN, Elkhart 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, Tipton County, IN, Wabash County, IN, Wells County, IN, White 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, Hillsdale County, MI, Ingham County, MI, Ionia County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Ottawa County, MI, Saint Joseph County, MI, Van Buren County, MI, Defiance County, OH, Paulding County, OH, Van Wert County, OH, Williams County, OH

The radar

The Northern Indiana radar (KIWX), 68 km from the middle of the area, began a volume at 09:53 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 nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 9.9 hours before the alert went out and 269 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 733 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 102 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.

Issued	Product	Office	Counties	Lasted
Aug 21, 10:49 PM CDT	Mesoscale Discussion	SPC	Carroll, Jo Daviess, Stephenson, Whiteside	86 min
Aug 22, 2:13 AM CDT	Mesoscale Discussion	SPC	Boone, Jo Daviess, Lake, McHenry, Stephenson, Winnebago	62 min
Aug 22, 3:17 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, DeKalb, DuPage, Ford and 28 more	2 hr
Aug 22, 2:04 PM CDT	Mesoscale Discussion	SPC	Adams, Allen, Bartholomew, Blackford, Boone, Brown and 53 more	2 hr
Aug 22, 6:51 PM CDT	Mesoscale Discussion	SPC	Allegan, Barry, Bay, Calhoun, Clinton, Eaton and 19 more	114 min

Nearby

Mesoscale Discussions in Indiana, 2007 Mesoscale Discussions in Michigan, 2007 Mesoscale Discussions in Ohio, 2007 Every mesoscale discussion in 2007

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.