Alert archive / Kansas / Mesoscale Discussions in 2015

Mesoscale Discussion 1606

August 4, 2015Phillips County, Sedgwick County, Colorado; 23 counties in Kansas; 16 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Aug 4, 2015, 10:58 AM MDT for Phillips County, Sedgwick County, Colorado; 23 counties in Kansas; 16 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 4, 2015, 10:58 AM MDT (16:58 UTC)
Expired: Aug 4, 2015, 1:00 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 41 counties

Phillips County, CO, Sedgwick County, CO, Barton County, KS, Cheyenne County, KS, Decatur County, KS, Ellis County, KS, Gove County, KS, Graham County, KS, Hodgeman County, KS, Lane County, KS, Logan County, KS, Ness County, KS, Norton County, KS, Osborne County, KS, Pawnee County, KS, Phillips County, KS, Rawlins County, KS, Rooks County, KS, Rush County, KS, Russell County, KS, Scott County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Trego County, KS, Arthur County, NE, Chase County, NE, Dawson County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Furnas County, NE, Gosper County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Keith County, NE, Lincoln County, NE, McPherson County, NE, Perkins County, NE, Red Willow County, NE

The radar

The Goodland radar (KGLD), 85 km from the middle of the area, began a volume at 16:58 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 470Aug 4, 12:30 PM MDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 5.0 hours before the alert went out and 157 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: 983 J/kg
Mixed-layer CIN: -213 J/kg
Mixed-layer LCL: 899 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 29 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
Aug 4, 12:34 PM MDT	Severe Thunderstorm Watch	SPC	Cheyenne, Decatur, Ellis, Gove, Graham, Jewell and 14 more	7 hr
Aug 4, 2:29 PM MDT	Mesoscale Discussion	SPC	Barton, Cheyenne, Clay, Cloud, Decatur, Ellis and 23 more	2 hr
Aug 4, 4:09 PM MDT	Mesoscale Discussion	SPC	Barton, Clark, Edwards, Ellsworth, Finney, Ford and 11 more	66 min
Aug 4, 4:16 PM MDT	Severe Thunderstorm Watch	SPC	Barber, Barton, Clark, Comanche, Edwards, Finney and 12 more	4 hr

Nearby

Mesoscale Discussions in Kansas, 2015 Mesoscale Discussions in Nebraska, 2015 Mesoscale Discussions in Colorado, 2015 Every mesoscale discussion in 2015

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.