Alert archive / Nebraska / Mesoscale Discussions in 2013

Mesoscale Discussion 410

April 9, 20137 counties in Kansas; 27 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2013, 12:30 PM CDT for 7 counties in Kansas; 27 counties in Nebraska. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Apr 9, 2013, 12:30 PM CDT (17:30 UTC)
Expired: Apr 9, 2013, 4:30 PM CDT
In force: 4 hr
Issued by: the Storm Prediction Center

All 34 counties

Decatur County, KS, Graham County, KS, Norton County, KS, Phillips County, KS, Rawlins County, KS, Sheridan County, KS, Thomas County, KS, Antelope County, NE, Boone County, NE, Buffalo County, NE, Custer County, NE, Dawson County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Howard County, NE, Kearney County, NE, Lincoln County, NE, Loup County, NE, Madison County, NE, Nance County, NE, Phelps County, NE, Pierce County, NE, Red Willow County, NE, Sherman County, NE, Valley County, NE, Wheeler County, NE

The radar

The Grand Island radar (KUEX), 127 km from the middle of the area, began a volume at 17:32 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, 5.5 hours before the alert went out and 91 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, 8:43 PM CDT	Mesoscale Discussion	SPC	Cheyenne	62 min
Apr 9, 3:00 PM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Atchison, Barber, Barton, Bourbon and 66 more	2 hr
Apr 9, 5:33 PM CDT	Severe Thunderstorm Watch	SPC	Barber, Barton, Butler, Chase, Comanche, Cowley and 18 more	7 hr
Apr 9, 5:45 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Clay, Cloud, Dickinson, Geary, Jackson and 11 more	7 hr
Apr 8, 11:15 PM CDT	Mesoscale Discussion	SPC	Boone, Buffalo, Burt, Butler, Chase, Colfax and 24 more	90 min
Apr 9, 5:12 AM CDT	Mesoscale Discussion	SPC	Burt, Dodge, Douglas, Saunders, Thurston, Washington	93 min
Apr 9, 6:46 PM CDT	Mesoscale Discussion	SPC	Arthur, Banner, Blaine, Box Butte, Boyd, Brown and 18 more	5 hr

Nearby

Mesoscale Discussions in Nebraska, 2013 Mesoscale Discussions in Kansas, 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.