Alert archive / Iowa / Mesoscale Discussions in 2008

Mesoscale Discussion 1769

July 12, 20086 states

The Storm Prediction Center issued this mesoscale discussion at Jul 12, 2008, 1:52 AM CDT for 6 states. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Jul 12, 2008, 1:52 AM CDT (06:52 UTC)
Expired: Jul 12, 2008, 2:45 AM CDT
In force: 53 min
Issued by: the Storm Prediction Center

All 129 counties

Adair County, IA, Adams County, IA, Allamakee County, IA, Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Cass County, IA, Cedar County, IA, Clarke County, IA, Clayton County, IA, Clinton County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Fremont County, IA, Grundy County, IA, Hardin County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Monroe County, IA, Montgomery County, IA, Muscatine County, IA, Page County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Scott County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cass County, IL, Christian County, IL, DeKalb County, IL, DeWitt County, IL, Fulton County, IL, Grundy County, IL, Henry County, IL, Jo Daviess County, IL, Kane County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McHenry County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Ogle County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Rock Island County, IL, Sangamon County, IL, Shelby County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Whiteside County, IL, Winnebago County, IL, Woodford County, IL, Brown County, KS, Doniphan County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Sullivan County, MO, Worth County, MO, Cass County, NE, Johnson County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Crawford County, WI, Dane County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Lafayette County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Vernon County, WI, Walworth County, WI

The radar

The Quad Cities radar (KDVN), 124 km from the middle of the area, began a volume at 06:51 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

Davenport, (KDVN), launched 00:00Z, 6.9 hours before the alert went out and 130 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: 331 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 1485 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 160 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
Jul 12, 3:37 PM CDT	Mesoscale Discussion	SPC	Bond, Champaign, Christian, Clark, Clay, Coles and 16 more	83 min
Jul 12, 4:28 PM CDT	Severe Thunderstorm Watch	SPC	Alexander, Bond, Champaign, Clark, Clay, Clinton and 39 more	5 hr
Jul 11, 8:29 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Calhoun, Carroll, Cherokee, Clay, Crawford and 18 more	91 min
Jul 11, 10:31 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Carroll, Cass, Clarke and 15 more	89 min
Jul 11, 10:40 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Allamakee, Audubon, Benton, Black Hawk and 48 more	5 hr
Jul 12, 3:26 AM CDT	Mesoscale Discussion	SPC	Audubon, Boone, Buena Vista, Butler, Calhoun, Carroll and 22 more	64 min
Jul 12, 2:58 PM CDT	Mesoscale Discussion	SPC	Barry, Butler, Carter, Christian, Douglas, Dunklin and 12 more	92 min
Jul 11, 9:15 PM CDT	Severe Thunderstorm Watch	SPC	Buffalo, Clark, Forest, Jackson, La Crosse, Langlade and 9 more	4 hr
Jul 11, 11:51 PM CDT	Mesoscale Discussion	SPC	Buffalo, Clark, Forest, Jackson, La Crosse, Langlade and 9 more	84 min

Nearby

Mesoscale Discussions in Iowa, 2008 Mesoscale Discussions in Illinois, 2008 Mesoscale Discussions in Missouri, 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; radar from the NEXRAD Level II archive.