Alert archive / Nebraska / Mesoscale Discussions in 2015

Mesoscale Discussion 182

April 1, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Apr 1, 2015, 11:36 PM CDT for 4 states. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Apr 1, 2015, 11:36 PM CDT (04:36 UTC)
Expired: Apr 2, 2015, 12:30 AM CDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Cloud County, KS, Marshall County, KS, Republic County, KS, Washington County, KS, Atchison County, MO, Cass County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Thayer County, NE

The radar

The Omaha radar (KOAX), 109 km from the middle of the area, began a volume at 04:37 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, 4.6 hours before the alert went out and 109 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: 278 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 2661 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 269 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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 1, 8:25 PM CDT	Mesoscale Discussion	SPC	Audubon, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 11 more	95 min
Apr 1, 7:26 PM CDT	Mesoscale Discussion	SPC	Harper	64 min
Apr 2, 1:37 AM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Douglas, Geary, Jackson and 9 more	113 min
Apr 2, 5:22 AM CDT	Mesoscale Discussion	SPC	Bourbon, Cherokee, Crawford, Linn, Miami	113 min
Apr 2, 4:47 PM CDT	Mesoscale Discussion	SPC	Chautauqua, Cherokee, Cowley, Crawford, Elk, Labette and 3 more	88 min
Apr 2, 11:50 AM CDT	Mesoscale Discussion	SPC	Bollinger, Butler, Cape Girardeau, Dunklin, Mississippi, New Madrid and 6 more	85 min
Apr 2, 2:46 PM CDT	Mesoscale Discussion	SPC	Camden, Crawford, Dallas, Dent, Douglas, Franklin and 22 more	89 min

Nearby

Mesoscale Discussions in Nebraska, 2015 Mesoscale Discussions in Iowa, 2015 Mesoscale Discussions in Kansas, 2015 Every mesoscale discussion in 2015

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.