Alert archive / Colorado / Mesoscale Discussions in 2015

Mesoscale Discussion 301

April 15, 20157 counties in Colorado; 6 counties in Kansas; 4 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2015, 1:41 PM MDT for 7 counties in Colorado; 6 counties in Kansas; 4 counties in Nebraska. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Apr 15, 2015, 1:41 PM MDT (19:41 UTC)
Expired: Apr 15, 2015, 4:15 PM MDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Cheyenne County, CO, Kit Carson County, CO, Logan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Yuma County, CO, Cheyenne County, KS, Greeley County, KS, Logan County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Chase County, NE, Cheyenne County, NE, Dundy County, NE, Kimball County, NE

The radar

The Goodland radar (KGLD), 126 km from the middle of the area, began a volume at 19:41 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 nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 7.7 hours before the alert went out and 50 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: 2567 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -37 m²/s²
0-3 km storm-relative helicity: -8 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
Apr 15, 3:37 PM MDT	Mesoscale Discussion	SPC	Morgan, Weld	83 min
Apr 15, 4:49 PM MDT	Mesoscale Discussion	SPC	Phillips, Sedgwick	2 hr

Nearby

Mesoscale Discussions in Colorado, 2015 Mesoscale Discussions in Kansas, 2015 Mesoscale Discussions in Nebraska, 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.