Alert archive / Nebraska / Mesoscale Discussions in 2013

Mesoscale Discussion 413

April 9, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2013, 5:46 PM MDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Apr 9, 2013, 5:46 PM MDT (23:46 UTC)
Expired: Apr 9, 2013, 10:45 PM MDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 51 counties

Sedgwick County, CO, Arthur County, NE, Banner County, NE, Blaine County, NE, Box Butte County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Kimball County, NE, Logan County, NE, McPherson County, NE, Morrill County, NE, Rock County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Thomas County, NE, Aurora County, SD, Bennett County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Custer County, SD, Douglas County, SD, Fall River County, SD, Gregory County, SD, Haakon County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jerauld County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Goshen County, WY, Niobrara County, WY

The radar

The North Platte radar (KLNX), 119 km from the middle of the area, began a volume at 23:49 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 12:00Z, 11.8 hours before the alert went out and 196 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: 5 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 512 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 724 m²/s²
0-3 km storm-relative helicity: 977 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 8, 7:43 PM MDT	Mesoscale Discussion	SPC	Logan, Morgan, Phillips, Sedgwick, Washington, Yuma	62 min
Apr 8, 10:15 PM MDT	Mesoscale Discussion	SPC	Phillips, Sedgwick, Washington, Yuma	90 min
Apr 9, 4:12 AM MDT	Mesoscale Discussion	SPC	Burt, Dodge, Douglas, Saunders, Thurston, Washington	93 min
Apr 9, 11:30 AM MDT	Mesoscale Discussion	SPC	Antelope, Boone, Buffalo, Custer, Dawson, Franklin and 21 more	4 hr
Apr 9, 4:45 PM MDT	Severe Thunderstorm Watch	SPC	Cass, Gage, Jefferson, Johnson, Lancaster, Nemaha and 5 more	7 hr
Apr 9, 3:22 AM MDT	Mesoscale Discussion	SPC	Aurora, Brookings, Charles Mix, Davison, Douglas, Hanson and 8 more	5 hr

Nearby

Mesoscale Discussions in Nebraska, 2013 Mesoscale Discussions in South Dakota, 2013 Mesoscale Discussions in Wyoming, 2013 Every mesoscale discussion in 2013

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.