Alert archive / Kansas / Mesoscale Discussions in 2011

Mesoscale Discussion 1478

July 2, 201115 counties in Colorado; 16 counties in Kansas; 4 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 2, 2011, 7:40 PM MDT for 15 counties in Colorado; 16 counties in Kansas; 4 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 2, 2011, 7:40 PM MDT (01:40 UTC)
Expired: Jul 2, 2011, 9:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 35 counties

Adams County, CO, Arapahoe County, CO, Cheyenne County, CO, Crowley County, CO, Elbert County, CO, Kiowa County, CO, Kit Carson County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Finney County, KS, Gove County, KS, Graham County, KS, Greeley County, KS, Hamilton County, KS, Lane County, KS, Logan County, KS, Rawlins County, KS, Scott County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Wichita County, KS, Chase County, NE, Dundy County, NE, Hayes County, NE, Hitchcock County, NE

The radar

The Goodland radar (KGLD), 70 km from the middle of the area, began a volume at 01:42 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 587Jul 2, 10:00 PM MDT

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 1.7 hours before the alert went out and 79 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: 920 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 2294 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: -51 m²/s²
0-3 km storm-relative helicity: -12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.0

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
Jul 2, 9:46 PM MDT	Mesoscale Discussion	SPC	Barton, Clay, Cloud, Dickinson, Ellis, Ellsworth and 27 more	29 min
Jul 2, 9:56 PM MDT	Severe Thunderstorm Watch	SPC	Barton, Butler, Chase, Clay, Cloud, Dickinson and 38 more	6 hr
Jul 3, 12:49 AM MDT	Mesoscale Discussion	SPC	Chase, Clay, Cloud, Dickinson, Ellsworth, Geary and 19 more	86 min
Jul 3, 2:00 PM MDT	Mesoscale Discussion	SPC	Barber, Butler, Chase, Clark, Comanche, Cowley and 14 more	60 min
Jul 2, 6:48 PM MDT	Mesoscale Discussion	SPC	Banner, Box Butte, Dawes, Garden, Morrill, Scotts Bluff and 2 more	117 min

Nearby

Mesoscale Discussions in Kansas, 2011 Mesoscale Discussions in Colorado, 2011 Mesoscale Discussions in Nebraska, 2011 Every mesoscale discussion in 2011

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.