Alert archive / Kansas / Mesoscale Discussions in 2011

Mesoscale Discussion 2077

August 28, 2011Cheyenne County, Kit Carson County, Colorado; 12 counties in Kansas

The Storm Prediction Center issued this mesoscale discussion at Aug 28, 2011, 2:25 PM MDT for Cheyenne County, Kit Carson County, Colorado; 12 counties in Kansas. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Aug 28, 2011, 2:25 PM MDT (20:25 UTC)
Expired: Aug 28, 2011, 3:30 PM MDT
In force: 65 min
Issued by: the Storm Prediction Center

Counties Cheyenne County, CO, Kit Carson County, CO, Cheyenne County, KS, Decatur County, KS, Gove County, KS, Graham County, KS, Greeley County, KS, Logan County, KS, Rawlins County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Wichita County, KS

The radar

The Goodland radar (KGLD), 22 km from the middle of the area, began a volume at 20:28 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 815Aug 28, 2:40 PM MDT

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 8.4 hours before the alert went out and 152 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2882 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 29 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Aug 28, 2:47 PM MDT	Severe Thunderstorm Watch	SPC	Cheyenne, Kit Carson	4 hr
Aug 28, 3:56 PM MDT	Mesoscale Discussion	SPC	Finney, Grant, Hamilton, Haskell, Kearny, Lane and 3 more	94 min

Nearby

Mesoscale Discussions in Kansas, 2011 Mesoscale Discussions in Colorado, 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.