Alert archive / Kansas / Mesoscale Discussions in 2012

Mesoscale Discussion 1656

July 30, 20126 counties in Colorado; 8 counties in Kansas; 4 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 30, 2012, 6:24 PM MDT for 6 counties in Colorado; 8 counties in Kansas; 4 counties in Nebraska. It was in force for 36 min.

The area

The outline as issued.

The facts

Issued: Jul 30, 2012, 6:24 PM MDT (00:24 UTC)
Expired: Jul 30, 2012, 7:00 PM MDT
In force: 36 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

Counties Cheyenne County, CO, Kit Carson County, CO, Logan County, CO, Phillips County, CO, Washington County, CO, Yuma County, CO, Cheyenne County, KS, Greeley County, KS, Logan County, KS, Rawlins 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), 43 km from the middle of the area, began a volume at 00:27 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 541Jul 30, 6:30 PM MDT

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.4 hours before the alert went out and 103 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: 144 J/kg
Mixed-layer CIN: -163 J/kg
Mixed-layer LCL: 1672 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.4

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 30, 6:53 PM MDT	Severe Thunderstorm Watch	SPC	Cheyenne, Kit Carson, Yuma	4 hr
Jul 31, 2:05 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Broomfield, Costilla, Crowley, Custer and 13 more	55 min

Nearby

Mesoscale Discussions in Kansas, 2012 Mesoscale Discussions in Colorado, 2012 Mesoscale Discussions in Nebraska, 2012 Every mesoscale discussion in 2012

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.