Alert archive / Iowa / Mesoscale Discussions in 2009

Mesoscale Discussion 243

March 23, 20095 states

The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2009, 6:04 PM CDT for 5 states. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Mar 23, 2009, 6:04 PM CDT (23:04 UTC)
Expired: Mar 23, 2009, 8:00 PM CDT
In force: 116 min
Issued by: the Storm Prediction Center

All 62 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Buena Vista County, IA, Carroll County, IA, Cass County, IA, Cherokee 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, Lyon County, IA, Madison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, O'Brien County, IA, Page County, IA, Plymouth County, IA, Pottawattamie County, IA, Ringgold County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Taylor County, IA, Union County, IA, Woodbury County, IA, Rock County, MN, Atchison County, MO, Gentry County, MO, Harrison County, MO, Mercer County, MO, Nodaway County, MO, Worth County, MO, Cass County, NE, Douglas County, NE, Nemaha County, NE, Otoe County, NE, Richardson County, NE, Sarpy County, NE, Washington County, NE, Beadle County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hyde County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD, Union County, SD

The radar

The Sioux Falls radar (KFSD), 95 km from the middle of the area, began a volume at 23:04 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 12:00Z, 11.1 hours before the alert went out and 161 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: 1023 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 504 m²/s²
0-3 km storm-relative helicity: 539 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
Mar 22, 11:28 PM CDT	Mesoscale Discussion	SPC	Cerro Gordo, Dickinson, Emmet, Franklin, Hamilton, Hancock and 8 more	3 hr
Mar 23, 3:11 PM CDT	Mesoscale Discussion	SPC	Crawford, Fremont, Harrison, Mills, Monona, Plymouth and 3 more	94 min
Mar 23, 3:50 PM CDT	Tornado Watch	SPC	Adams, Audubon, Cass, Crawford, Fremont, Harrison and 11 more	6 hr
Mar 23, 5:08 PM CDT	Mesoscale Discussion	SPC	Buchanan, Clay, Clinton, DeKalb, Platte	97 min
Mar 23, 10:13 AM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Blaine, Boone, Boyd, Brown and 43 more	2 hr
Mar 23, 12:16 PM CDT	Tornado Watch	SPC	Adams, Antelope, Blaine, Boone, Boyd, Brown and 46 more	4 hr
Mar 23, 4:59 AM CDT	Mesoscale Discussion	SPC	Butte, Custer, Harding, Lawrence	6 hr
Mar 23, 12:06 PM CDT	Mesoscale Discussion	SPC	Butte, Harding, Lawrence, Meade, Pennington, Perkins	5 hr
Mar 23, 6:56 PM CDT	Mesoscale Discussion	SPC	Butte, Campbell, Corson, Custer, Dewey, Haakon and 13 more	3 hr

Nearby

Mesoscale Discussions in Iowa, 2009 Mesoscale Discussions in South Dakota, 2009 Mesoscale Discussions in Nebraska, 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.