Alert archive / Iowa / Mesoscale Discussions in 2011

Mesoscale Discussion 2037

August 22, 201129 counties in Iowa; 6 counties in Missouri; 16 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Aug 22, 2011, 1:42 AM CDT for 29 counties in Iowa; 6 counties in Missouri; 16 counties in Nebraska. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Aug 22, 2011, 1:42 AM CDT (06:42 UTC)
Expired: Aug 22, 2011, 4:15 AM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 51 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Decatur County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Ida County, IA, Lucas County, IA, Madison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Sac County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Wayne County, IA, Woodbury County, IA, Atchison County, MO, Gentry County, MO, Harrison County, MO, Mercer County, MO, Nodaway County, MO, Worth County, MO, Antelope County, NE, Burt County, NE, Cedar County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Knox County, NE, Madison County, NE, Pierce County, NE, Sarpy County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE

The radar

The Omaha radar (KOAX), 73 km from the middle of the area, began a volume at 06:44 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

Omaha, NE (KOAX), launched 00:00Z, 6.7 hours before the alert went out and 73 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: 522 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 1127 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 5.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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Nearby

Mesoscale Discussions in Iowa, 2011 Mesoscale Discussions in Nebraska, 2011 Mesoscale Discussions in Missouri, 2011 Every mesoscale discussion in 2011

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.