Alert archive / Iowa / Mesoscale Discussions in 2005

Mesoscale Discussion 2224

September 18, 200536 counties in Iowa; 18 counties in Nebraska; 5 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 18, 2005, 5:38 PM CDT for 36 counties in Iowa; 18 counties in Nebraska; 5 counties in South Dakota. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Sep 18, 2005, 5:38 PM CDT (22:38 UTC)
Expired: Sep 18, 2005, 7:15 PM CDT
In force: 97 min
Issued by: the Storm Prediction Center

All 59 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Franklin County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Lyon County, IA, Madison County, IA, Monona County, IA, O'Brien County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Polk County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Story County, IA, Warren County, IA, Webster County, IA, Woodbury County, IA, Wright County, IA, Antelope County, NE, Boone County, NE, Burt County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Holt County, NE, Knox County, NE, Madison County, NE, Pierce County, NE, Platte County, NE, Stanton County, NE, Thurston County, NE, Wayne County, NE, Wheeler County, NE, Bon Homme County, SD, Clay County, SD, Lincoln County, SD, Union County, SD, Yankton County, SD

The radar

The Omaha radar (KOAX), 104 km from the middle of the area, began a volume at 22:40 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, 10.6 hours before the alert went out and 104 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: 1434 J/kg
Mixed-layer CIN: -240 J/kg
Mixed-layer LCL: 812 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 3 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
Sep 18, 3:40 PM CDT	Tornado Watch	SPC	Fremont, Harrison, Mills, Monona, Page, Plymouth and 2 more	7 hr
Sep 18, 1:50 PM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Blaine, Boone, Boyd, Brown and 37 more	2 hr
Sep 18, 3:20 PM CDT	Severe Thunderstorm Watch	SPC	Boyd, Keya Paha	8 hr
Sep 18, 4:08 PM CDT	Mesoscale Discussion	SPC	Pawnee, Richardson	2 hr
Sep 18, 5:59 PM CDT	Mesoscale Discussion	SPC	Clark, Codington, Day, Faulk, Hand, Hughes and 7 more	91 min

Nearby

Mesoscale Discussions in Iowa, 2005 Mesoscale Discussions in Nebraska, 2005 Mesoscale Discussions in South Dakota, 2005 Every 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.