Alert archive / Nebraska / Mesoscale Discussions in 2017

Mesoscale Discussion 494

April 14, 20175 counties in Kansas; 37 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2017, 9:17 PM CDT for 5 counties in Kansas; 37 counties in Nebraska. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Apr 14, 2017, 9:17 PM CDT (02:17 UTC)
Expired: Apr 14, 2017, 10:45 PM CDT
In force: 88 min
Issued by: the Storm Prediction Center

All 42 counties

Jewell County, KS, Norton County, KS, Phillips County, KS, Republic County, KS, Smith County, KS, Adams County, NE, Boone County, NE, Buffalo County, NE, Butler County, NE, Clay County, NE, Colfax County, NE, Custer County, NE, Dawson County, NE, Fillmore County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Jefferson County, NE, Kearney County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Phelps County, NE, Platte County, NE, Polk County, NE, Saline County, NE, Seward County, NE, Sherman County, NE, Thayer County, NE, Valley County, NE, Webster County, NE, Wheeler County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 61 km from the middle of the area, began a volume at 02:19 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.3 hours before the alert went out and 160 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: 484 J/kg
Mixed-layer CIN: -151 J/kg
Mixed-layer LCL: 2217 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 271 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.3

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 15, 3:32 PM CDT	Mesoscale Discussion	SPC	Clark, Comanche, Kiowa	88 min
Apr 15, 4:00 PM CDT	Severe Thunderstorm Watch	SPC	Barber, Clark, Comanche, Edwards, Ford, Hodgeman and 4 more	7 hr
Apr 15, 4:30 PM CDT	Mesoscale Discussion	SPC	Atchison, Barton, Clay, Dickinson, Ellsworth, Geary and 14 more	90 min
Apr 15, 5:05 PM CDT	Severe Thunderstorm Watch	SPC	Atchison, Brown, Clay, Dickinson, Doniphan, Geary and 10 more	7 hr
Apr 14, 8:37 PM CDT	Mesoscale Discussion	SPC	Arthur, Banner, Cheyenne, Deuel, Garden, Keith and 3 more	113 min
Apr 15, 4:01 PM CDT	Mesoscale Discussion	SPC	Burt, Cass, Cedar, Cuming, Dakota, Dixon and 16 more	119 min
Apr 15, 6:22 PM CDT	Mesoscale Discussion	SPC	Burt, Cedar, Colfax, Cuming, Dakota, Dixon and 8 more	83 min

Nearby

Mesoscale Discussions in Nebraska, 2017 Mesoscale Discussions in Kansas, 2017 Every mesoscale discussion in 2017

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.