Alert archive / Iowa / Mesoscale Discussions in 2005

Mesoscale Discussion 1793

July 20, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2005, 5:55 AM CDT for 4 states. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Jul 20, 2005, 5:55 AM CDT (10:55 UTC)
Expired
Jul 20, 2005, 7:30 AM CDT
In force
95 min
Issued by
the Storm Prediction Center
All 77 counties

Allamakee County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Crawford County, IA, Dallas County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Harrison County, IA, Howard County, IA, Humboldt County, IA, Ida County, IA, Marshall County, IA, Mitchell County, IA, Monona County, IA, Pocahontas County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Webster County, IA, Winneshiek County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Dakota County, MN, Dodge County, MN, Fillmore County, MN, Goodhue County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Ramsey County, MN, Wabasha County, MN, Washington County, MN, Winona County, MN, Burt County, NE, Barron County, WI, Buffalo County, WI, Burnett County, WI, Chippewa County, WI, Clark County, WI, Crawford County, WI, Dunn County, WI, Eau Claire County, WI, Grant County, WI, Jackson County, WI, La Crosse County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Richland County, WI, Rusk County, WI, Saint Croix County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Washburn County, WI

The radar

The Des Moines radar (KDMX), 171 km from the middle of the area, began a volume at 10:57 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

Minneapolis, MN (KMPX), launched 00:00Z, 10.9 hours before the alert went out and 177 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-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 2005-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2127 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2005-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2127 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
1273 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
154 m²/s²
Significant tornado parameter
0.5
Supercell composite
7.0

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.

IssuedProductOfficeCountiesLasted
Jul 19, 11:18 PM CDTMesoscale DiscussionSPCLyon, Sioux87 min
Jul 20, 1:25 AM CDTSevere Thunderstorm WatchSPCBuena Vista, Calhoun, Cherokee, Clay, Dickinson, Emmet and 12 more6 hr
Jul 20, 3:23 AM CDTMesoscale DiscussionSPCAllamakee, Benton, Black Hawk, Bremer, Buchanan, Buena Vista and 35 more2 hr
Jul 20, 11:26 AM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Carroll, Cass and 26 more94 min
Jul 19, 10:43 PM CDTMesoscale DiscussionSPCMarshall, Norman, Pennington, Polk, Red Lake92 min
Jul 20, 1:28 AM CDTMesoscale DiscussionSPCBeltrami, Cook, Koochiching, Lake, Saint Louis32 min
Jul 19, 7:39 PM CDTMesoscale DiscussionSPCArthur, Cherry, Hooker, Keith, McPherson2 hr
Jul 20, 6:20 PM CDTSevere Thunderstorm WatchSPCCherry, Keya Paha5 hr

Nearby

Mesoscale Discussions in Iowa, 2005Mesoscale Discussions in Wisconsin, 2005Mesoscale Discussions in Minnesota, 2005Every mesoscale discussion in 2005

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.