Alert archive / Iowa / Mesoscale Discussions in 2005

Mesoscale Discussion 1876

July 25, 200512 counties in Iowa; Atchison County, Missouri; Nemaha County, Pawnee County, Richardson County, Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2005, 9:20 PM CDT for 12 counties in Iowa; Atchison County, Missouri; Nemaha County, Pawnee County, Richardson County, Nebraska. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Jul 25, 2005, 9:20 PM CDT (02:20 UTC)
Expired: Jul 25, 2005, 10:15 PM CDT
In force: 55 min
Issued by: the Storm Prediction Center

Counties Adair County, IA, Adams County, IA, Boone County, IA, Cass County, IA, Dallas County, IA, Fremont County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Montgomery County, IA, Page County, IA, Story County, IA, Atchison County, MO, Nemaha County, NE, Pawnee County, NE, Richardson County, NE

The radar

The Omaha radar (KOAX), 122 km from the middle of the area, began a volume at 02:23 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, 2.3 hours before the alert went out and 122 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: 2018 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 1135 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -77 m²/s²
0-3 km storm-relative helicity: 194 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 10.3

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
Jul 25, 7:10 PM CDT	Mesoscale Discussion	SPC	Audubon, Carroll, Greene, Mills, Pottawattamie, Shelby and 1 more	65 min
Jul 25, 9:09 PM CDT	Mesoscale Discussion	SPC	Allamakee, Bremer, Buchanan, Clayton, Delaware, Dubuque and 1 more	2 hr
Jul 26, 3:29 PM CDT	Mesoscale Discussion	SPC	Barry, Barton, Bates, Benton, Boone, Callaway and 38 more	2 hr

Nearby

Mesoscale Discussions in Iowa, 2005 Mesoscale Discussions in Nebraska, 2005 Mesoscale Discussions in Missouri, 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.