Alert archive / Nebraska / Mesoscale Discussions in 2017

Mesoscale Discussion 674

May 9, 201710 counties in Kansas; 12 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 9, 2017, 7:15 PM CDT for 10 counties in Kansas; 12 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 9, 2017, 7:15 PM CDT (00:15 UTC)
Expired: May 9, 2017, 9:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 5%

All 22 counties

Cloud County, KS, Jewell County, KS, Marshall County, KS, Mitchell County, KS, Osborne County, KS, Phillips County, KS, Republic County, KS, Rooks County, KS, Smith County, KS, Washington County, KS, Clay County, NE, Fillmore County, NE, Franklin County, NE, Gage County, NE, Harlan County, NE, Jefferson County, NE, Johnson County, NE, Nuckolls County, NE, Pawnee County, NE, Saline County, NE, Thayer County, NE, Webster County, NE

The radar

The Grand Island radar (KUEX), 68 km from the middle of the area, began a volume at 00:17 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, 0.3 hours before the alert went out and 268 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1700 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 178 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

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
May 9, 9:32 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Finney, Gove, Graham, Grant and 16 more	58 min
May 10, 1:29 AM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Ellis, Gove, Graham, Jewell and 12 more	61 min
May 10, 6:04 AM CDT	Mesoscale Discussion	SPC	Barber, Comanche, Harper, Kingman	116 min
May 10, 12:39 PM CDT	Mesoscale Discussion	SPC	Bourbon, Franklin, Johnson, Leavenworth, Linn, Miami and 1 more	3 hr
May 10, 3:11 PM CDT	Mesoscale Discussion	SPC	Grant, Haskell, Morton, Seward, Stevens	94 min
May 10, 3:37 PM CDT	Mesoscale Discussion	SPC	Allen, Bourbon, Butler, Chautauqua, Cherokee, Cowley and 10 more	113 min
May 10, 6:30 PM CDT	Severe Thunderstorm Watch	SPC	Bourbon, Cherokee, Crawford	2 hr

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.