Alert archive / Nebraska / Mesoscale Discussions in 2005

Mesoscale Discussion 956

May 21, 20055 states

The Storm Prediction Center issued this mesoscale discussion at May 21, 2005, 7:26 PM CDT for 5 states. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: May 21, 2005, 7:26 PM CDT (00:26 UTC)
Expired: May 21, 2005, 9:00 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

All 58 counties

Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Fremont County, IA, Harrison County, IA, Ida County, IA, Mills County, IA, Monona County, IA, O'Brien County, IA, Plymouth County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Woodbury County, IA, Brown County, KS, Clay County, KS, Cloud County, KS, Jackson County, KS, Marshall County, KS, Nemaha County, KS, Ottawa County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Washington County, KS, Atchison County, MO, Burt County, NE, Butler County, NE, Cass County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thayer County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Clay County, SD, Union County, SD

The radar

The Omaha radar (KOAX), 67 km from the middle of the area, began a volume at 00:28 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 00:00Z, 0.4 hours before the alert went out and 198 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: 1681 J/kg
Mixed-layer CIN: -207 J/kg
Mixed-layer LCL: 1503 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 168 m²/s²
0-3 km storm-relative helicity: 344 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

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
May 21, 8:28 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Cass, Clarke and 16 more	2 hr
May 22, 12:56 AM CDT	Mesoscale Discussion	SPC	Adams, Appanoose, Clarke, Decatur, Lucas, Madison and 6 more	64 min
May 22, 2:13 PM CDT	Mesoscale Discussion	SPC	Barber, Chautauqua, Cherokee, Cowley, Crawford, Elk and 6 more	2 hr
May 22, 5:29 PM CDT	Mesoscale Discussion	SPC	Barber, Chautauqua, Comanche, Cowley, Harper, Montgomery and 1 more	91 min

Nearby

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