Alert archive / Nebraska / Mesoscale Discussions in 2018

Mesoscale Discussion 1198

July 29, 201811 counties in Kansas; 18 counties in Nebraska; 7 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 29, 2018, 5:07 PM CDT for 11 counties in Kansas; 18 counties in Nebraska; 7 counties in South Dakota. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Jul 29, 2018, 5:07 PM CDT (22:07 UTC)
Expired: Jul 29, 2018, 6:00 PM CDT
In force: 53 min
Issued by: the Storm Prediction Center

All 36 counties

Cheyenne County, KS, Decatur County, KS, Gove County, KS, Lane County, KS, Logan County, KS, Rawlins County, KS, Scott County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Wichita County, KS, Arthur County, NE, Chase County, NE, Cherry County, NE, Dundy County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Red Willow County, NE, Sheridan County, NE, Thomas County, NE, Bennett County, SD, Custer County, SD, Fall River County, SD, Jackson County, SD, Oglala Lakota County, SD, Pennington County, SD, Todd County, SD

The radar

The North Platte radar (KLNX), 110 km from the middle of the area, began a volume at 22:06 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 324Jul 29, 8:00 PM CDT

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 10.1 hours before the alert went out and 225 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: 181 J/kg
Mixed-layer CIN: -407 J/kg
Mixed-layer LCL: 1180 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 208 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 28, 10:46 PM CDT	Mesoscale Discussion	SPC	Decatur, Gove, Graham, Logan, Norton, Rawlins and 2 more	89 min
Jul 28, 11:10 PM CDT	Mesoscale Discussion	SPC	Barber, Barton, Clark, Comanche, Edwards, Finney and 12 more	2 hr
Jul 29, 1:59 AM CDT	Severe Thunderstorm Watch	SPC	Barber, Barton, Butler, Chase, Chautauqua, Cowley and 15 more	5 hr
Jul 29, 4:00 AM CDT	Mesoscale Discussion	SPC	Butler, Chautauqua, Cowley, Harper, Harvey, Sedgwick and 1 more	2 hr
Jul 29, 1:46 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Rawlins, Sherman	59 min
Jul 29, 2:07 PM CDT	Tornado Watch	SPC	Greeley, Sherman, Wallace	8 hr
Jul 29, 2:34 PM CDT	Severe Thunderstorm Watch	SPC	Cheyenne, Gove, Logan, Rawlins, Sheridan, Thomas and 1 more	7 hr
Jul 29, 6:23 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Greeley, Sherman, Wallace	67 min
Jul 28, 7:38 PM CDT	Mesoscale Discussion	SPC	Banner, Box Butte, Dawes, Kimball, Morrill, Scotts Bluff and 1 more	97 min
Jul 29, 2:12 PM CDT	Mesoscale Discussion	SPC	Butte, Lawrence	2 hr

Nearby

Mesoscale Discussions in Nebraska, 2018 Mesoscale Discussions in Kansas, 2018 Mesoscale Discussions in South Dakota, 2018 Every mesoscale discussion in 2018

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.