Alert archive / Iowa / Mesoscale Discussions in 2007

Mesoscale Discussion 1375

July 3, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Jul 3, 2007, 10:24 PM CDT for 4 states. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Jul 3, 2007, 10:24 PM CDT (03:24 UTC)
Expired: Jul 4, 2007, 12:00 AM CDT
In force: 96 min
Issued by: the Storm Prediction Center

All 52 counties

Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Chickasaw County, IA, Clayton County, IA, Crawford County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Hamilton County, IA, Hardin County, IA, Harrison County, IA, Ida County, IA, Jackson County, IA, Jones County, IA, Linn County, IA, Monona County, IA, Sac County, IA, Shelby County, IA, Webster County, IA, Wright County, IA, Carroll County, IL, Jo Daviess County, IL, Stephenson County, IL, Antelope County, NE, Boone County, NE, Burt County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Madison County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Grant County, WI, Green County, WI, Iowa County, WI, Lafayette County, WI, Rock County, WI

The radar

The Des Moines radar (KDMX), 59 km from the middle of the area, began a volume at 03:25 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, 3.4 hours before the alert went out and 236 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: 1400 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 1073 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 5.6

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 4, 12:59 AM CDT	Mesoscale Discussion	SPC	Henry, Knox, Marshall, Mercer, Peoria, Rock Island and 2 more	3 hr
Jul 4, 12:27 PM CDT	Mesoscale Discussion	SPC	Bond, Clay, Clinton, Edwards, Fayette, Franklin and 24 more	63 min
Jul 4, 2:00 PM CDT	Severe Thunderstorm Watch	SPC	Alexander, Bond, Brown, Calhoun, Christian, Clark and 45 more	7 hr
Jul 4, 5:14 PM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Clay, Clinton, Crawford, Cumberland and 29 more	91 min
Jul 3, 7:30 PM CDT	Mesoscale Discussion	SPC	Chase, Dundy, Hitchcock, Perkins	90 min
Jul 3, 10:58 PM CDT	Mesoscale Discussion	SPC	Chase, Dundy, Frontier, Hayes, Hitchcock, Red Willow	92 min
Jul 3, 7:57 PM CDT	Mesoscale Discussion	SPC	Brown, Calumet, Fond du Lac, Green Lake, Kewaunee, Manitowoc and 11 more	63 min

Nearby

Mesoscale Discussions in Iowa, 2007 Mesoscale Discussions in Nebraska, 2007 Mesoscale Discussions in Wisconsin, 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.