Alert archive / Nebraska / Mesoscale Discussions in 2005

Mesoscale Discussion 591

April 18, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2005, 11:22 PM CDT for 4 states. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Apr 18, 2005, 11:22 PM CDT (04:22 UTC)
Expired: Apr 19, 2005, 12:45 AM CDT
In force: 83 min
Issued by: the Storm Prediction Center

All 44 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Cass County, IA, Fremont County, IA, Guthrie County, IA, Harrison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Shelby County, IA, Brown County, KS, Clay County, KS, Cloud County, KS, Geary County, KS, Jackson County, KS, Lincoln County, KS, Marshall County, KS, Nemaha County, KS, Ottawa County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Wabaunsee County, KS, Washington County, KS, Atchison County, MO, Holt County, MO, Cass County, NE, Dodge County, NE, Douglas 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, Thayer County, NE, Washington County, NE

The radar

The Topeka radar (KTWX), 117 km from the middle of the area, began a volume at 04:26 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, 4.4 hours before the alert went out and 127 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: 560 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1430 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

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
Apr 18, 8:27 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Cass, Dallas, Fremont and 7 more	63 min
Apr 18, 8:45 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Audubon, Cass, Fremont, Guthrie and 6 more	5 hr
Apr 19, 1:45 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Boone, Carroll, Cass and 17 more	30 min
Apr 19, 10:48 AM CDT	Mesoscale Discussion	SPC	Appanoose, Benton, Black Hawk, Bremer, Buchanan, Butler and 27 more	57 min
Apr 19, 5:49 PM CDT	Mesoscale Discussion	SPC	Clark, Comanche, Edwards, Ford, Gove, Graham and 13 more	116 min
Apr 19, 2:04 PM CDT	Mesoscale Discussion	SPC	Banner, Cheyenne, Kimball	86 min
Apr 19, 3:30 PM CDT	Severe Thunderstorm Watch	SPC	Arthur, Brown, Chase, Cherry, Cheyenne, Deuel and 11 more	7 hr

Nearby

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