Alert archive / Illinois / Mesoscale Discussions in 2008

Mesoscale Discussion 1748

July 10, 20085 states

The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2008, 12:55 PM CDT for 5 states. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Jul 10, 2008, 12:55 PM CDT (17:55 UTC)
Expired: Jul 10, 2008, 2:30 PM CDT
In force: 95 min
Issued by: the Storm Prediction Center

All 51 counties

Cedar County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Muscatine County, IA, Scott County, IA, Washington County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Henry County, IL, Jo Daviess County, IL, Kane County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Rock Island County, IL, Stephenson County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Lake County, IN, LaPorte County, IN, Porter County, IN, Saint Joseph County, IN, Allegan County, MI, Berrien County, MI, Cass County, MI, Van Buren County, MI, Grant County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Milwaukee County, WI, Racine County, WI, Rock County, WI, Walworth County, WI, Waukesha County, WI

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 677Jul 10, 1:20 PM CDT

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 5.9 hours before the alert went out and 149 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: 336 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1383 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

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
Jul 10, 9:36 AM CDT	Mesoscale Discussion	SPC	Carroll, Jo Daviess, Stephenson	84 min
Jul 10, 1:18 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 23 more	10 hr
Jul 10, 5:52 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 17 more	83 min
Jul 10, 12:06 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Clayton, Howard, Mitchell, Winneshiek	6 hr
Jul 10, 1:49 PM CDT	Mesoscale Discussion	SPC	Allamakee, Winneshiek	86 min
Jul 10, 3:38 PM CDT	Mesoscale Discussion	SPC	Allamakee, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 14 more	97 min

Nearby

Mesoscale Discussions in Illinois, 2008 Mesoscale Discussions in Iowa, 2008 Mesoscale Discussions in Wisconsin, 2008 Every mesoscale discussion in 2008

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.