Alert archive / Iowa / Mesoscale Discussions in 2009

Mesoscale Discussion 2267

December 23, 20094 states

The Storm Prediction Center issued this mesoscale discussion at Dec 23, 2009, 6:44 AM CST for 4 states. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Dec 23, 2009, 6:44 AM CST (12:44 UTC)
Expired: Dec 23, 2009, 10:45 AM CST
In force: 4 hr
Issued by: the Storm Prediction Center

All 56 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Cass County, IA, Cedar County, IA, Clinton County, IA, Dallas County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Iowa County, IA, Jasper County, IA, Johnson County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Montgomery County, IA, Muscatine County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Scott County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Union County, IA, Warren County, IA, Bureau County, IL, LaSalle County, IL, Lee County, IL, Rock Island County, IL, Whiteside County, IL, Republic County, KS, Washington County, KS, Butler County, NE, Cass County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nuckolls County, NE, Otoe County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Washington County, NE, York County, NE

The radar

The Des Moines radar (KDMX), 64 km from the middle of the area, began a volume at 12:49 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

Topeka, KS (KTOP), launched 12:00Z, 0.7 hours before the alert went out and 295 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 420 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 267 m²/s²
0-3 km storm-relative helicity: 294 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
Dec 23, 12:21 PM CST	Mesoscale Discussion	SPC	Boone, Carroll, DeKalb, Jo Daviess, Kane, Lee and 5 more	4 hr
Dec 22, 11:32 PM CST	Mesoscale Discussion	SPC	Barton, Clark, Edwards, Ford, Hodgeman, Jewell and 7 more	4 hr
Dec 23, 10:31 AM CST	Mesoscale Discussion	SPC	Allen, Anderson, Bourbon, Cherokee, Coffey, Crawford and 15 more	89 min

Nearby

Mesoscale Discussions in Iowa, 2009 Mesoscale Discussions in Nebraska, 2009 Mesoscale Discussions in Illinois, 2009 Every mesoscale discussion in 2009

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.