Alert archive / Iowa / Mesoscale Discussions in 2005

Mesoscale Discussion 2228

September 18, 200516 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at Sep 18, 2005, 11:44 PM CDT for 16 counties in Iowa. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Sep 18, 2005, 11:44 PM CDT (04:44 UTC)
Expired: Sep 19, 2005, 1:15 AM CDT
In force: 91 min
Issued by: the Storm Prediction Center

Counties Adair County, IA, Audubon County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Greene County, IA, Guthrie County, IA, Madison County, IA, Polk County, IA, Shelby County, IA, Union County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 64 km from the middle of the area, began a volume at 04:44 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, 4.7 hours before the alert went out and 164 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: 2068 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1326 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 205 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 8.9

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, 8:13 PM CDT	Mesoscale Discussion	SPC	Adair, Appanoose, Audubon, Benton, Black Hawk, Boone and 73 more	62 min
Sep 18, 10:00 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Benton, Boone and 62 more	60 min
Sep 18, 10:05 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Appanoose, Audubon, Boone, Buena Vista and 52 more	5 hr
Sep 19, 1:34 AM CDT	Mesoscale Discussion	SPC	Benton, Black Hawk, Bremer, Buchanan, Cedar, Chickasaw and 16 more	86 min
Sep 19, 11:49 AM CDT	Mesoscale Discussion	SPC	Appanoose, Davis, Decatur, Des Moines, Henry, Jefferson and 11 more	86 min
Sep 19, 1:00 PM CDT	Severe Thunderstorm Watch	SPC	Des Moines, Lee, Van Buren	5 hr
Sep 19, 3:48 PM CDT	Mesoscale Discussion	SPC	Des Moines, Lee, Van Buren	87 min

Nearby

Mesoscale Discussions in Iowa, 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.