Alert archive / Iowa / Mesoscale Discussions in 2007

Mesoscale Discussion 1672

August 7, 20075 states

The Storm Prediction Center issued this mesoscale discussion at Aug 7, 2007, 1:58 PM CDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 7, 2007, 1:58 PM CDT (18:58 UTC)
Expired: Aug 7, 2007, 4:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 84 counties

Adams County, IA, Appanoose County, IA, Cedar County, IA, Clarke County, IA, Clinton County, IA, Davis County, IA, Decatur County, IA, Des Moines County, IA, Fremont County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Muscatine County, IA, Page County, IA, Poweshiek County, IA, Ringgold County, IA, Scott County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Bureau County, IL, Carroll County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Knox County, IL, Lee County, IL, Marshall County, IL, McDonough County, IL, Mercer County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Warren County, IL, Whiteside County, IL, Brown County, KS, Doniphan County, KS, Nemaha County, KS, Adair County, MO, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Caldwell County, MO, Clark County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Sullivan County, MO, Worth County, MO, Johnson County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE

The radar

The Des Moines radar (KDMX), 147 km from the middle of the area, began a volume at 19:02 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 567Aug 7, 4:45 PM CDT

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 7.0 hours before the alert went out and 201 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: 679 J/kg
Mixed-layer CIN: -226 J/kg
Mixed-layer LCL: 1226 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 175 m²/s²
0-3 km storm-relative helicity: 281 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.2

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 7, 4:45 PM CDT	Severe Thunderstorm Watch	SPC	Hancock, Henderson	6 hr
Aug 6, 7:24 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 42 more	96 min
Aug 6, 10:28 PM CDT	Mesoscale Discussion	SPC	Adair, Audubon, Carroll, Cass, Crawford, Fremont and 10 more	3 hr
Aug 7, 5:02 PM CDT	Mesoscale Discussion	SPC	Barton, Chase, Clay, Dickinson, Douglas, Ellsworth and 18 more	88 min
Aug 7, 1:46 AM CDT	Mesoscale Discussion	SPC	Adams, Buffalo, Clay, Franklin, Hall, Harlan and 3 more	89 min
Aug 7, 2:24 PM CDT	Mesoscale Discussion	SPC	Dawes, Sioux	2 hr

Nearby

Mesoscale Discussions in Iowa, 2007 Mesoscale Discussions in Missouri, 2007 Mesoscale Discussions in Illinois, 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.