Alert archive / Nebraska / Mesoscale Discussions in 2016

Mesoscale Discussion 1287

July 15, 201624 counties in Nebraska; Bennett County, Oglala Lakota County, Todd County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 15, 2016, 2:11 AM MDT for 24 counties in Nebraska; Bennett County, Oglala Lakota County, Todd County, South Dakota. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jul 15, 2016, 2:11 AM MDT (08:11 UTC)
Expired: Jul 15, 2016, 4:45 AM MDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 27 counties

Arthur County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Custer County, NE, Dawson County, NE, Garfield County, NE, Grant County, NE, Greeley County, NE, Holt County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Rock County, NE, Sheridan County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE, Bennett County, SD, Oglala Lakota County, SD, Todd County, SD

The radar

The North Platte radar (KLNX), 27 km from the middle of the area, began a volume at 08:12 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, 8.2 hours before the alert went out and 112 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: 30 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 2559 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -56 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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
Jul 15, 1:12 PM MDT	Severe Thunderstorm Watch	SPC	Dundy	7 hr

Nearby

Mesoscale Discussions in Nebraska, 2016 Mesoscale Discussions in South Dakota, 2016 Every mesoscale discussion in 2016

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.