Alert archive / Nebraska / Mesoscale Discussions in 2016

Mesoscale Discussion 1360

July 22, 20164 counties in Nebraska; Custer County, Fall River County, South Dakota; Niobrara County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 22, 2016, 1:45 PM MDT for 4 counties in Nebraska; Custer County, Fall River County, South Dakota; Niobrara County, Wyoming. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jul 22, 2016, 1:45 PM MDT (19:45 UTC)
Expired: Jul 22, 2016, 2:45 PM MDT
In force: 60 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Box Butte County, NE, Dawes County, NE, Sheridan County, NE, Sioux County, NE, Custer County, SD, Fall River County, SD, Niobrara County, WY

The radar

The Rapid City radar (KUDX), 128 km from the middle of the area, began a volume at 19:48 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

Rapid City, SD (KRAP), launched 12:00Z, 7.8 hours before the alert went out and 121 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: 41 J/kg
Mixed-layer CIN: -371 J/kg
Mixed-layer LCL: 3370 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 36 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
Jul 22, 11:28 AM MDT	Mesoscale Discussion	SPC	Brown, Campbell, Day, Edmunds, McPherson, Marshall	2 hr
Jul 22, 1:16 PM MDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Brookings, Brown, Buffalo, Clark and 23 more	8 hr
Jul 22, 1:17 PM MDT	Mesoscale Discussion	SPC	Campbell, Corson, Dewey, Harding, Perkins, Ziebach	2 hr
Jul 22, 2:41 PM MDT	Mesoscale Discussion	SPC	Beadle, Brookings, Buffalo, Clark, Codington, Day and 16 more	94 min
Jul 22, 3:06 PM MDT	Severe Thunderstorm Watch	SPC	Campbell, Corson, Dewey, Harding, Perkins	9 hr
Jul 22, 5:35 PM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Buffalo, Campbell, Corson, Dewey and 13 more	55 min

Nearby

Mesoscale Discussions in Nebraska, 2016 Mesoscale Discussions in South Dakota, 2016 Mesoscale Discussions in Wyoming, 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.