Alert archive / Colorado / Mesoscale Discussions in 2017

Mesoscale Discussion 850

May 26, 201714 counties in Colorado; Banner County, Cheyenne County, Kimball County, Nebraska; Laramie County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at May 26, 2017, 7:15 PM MDT for 14 counties in Colorado; Banner County, Cheyenne County, Kimball County, Nebraska; Laramie County, Wyoming. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: May 26, 2017, 7:15 PM MDT (01:15 UTC)
Expired: May 26, 2017, 8:15 PM MDT
In force: 60 min
Issued by: the Storm Prediction Center

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, Washington County, CO, Weld County, CO, Yuma County, CO, Banner County, NE, Cheyenne County, NE, Kimball County, NE, Laramie County, WY

The radar

The Denver radar (KFTG), 92 km from the middle of the area, began a volume at 01:17 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 00:00Z, 1.3 hours before the alert went out and 29 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: 1044 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 1740 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 267 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 9.5

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 26, 9:03 PM MDT	Mesoscale Discussion	SPC	Cheyenne, Kit Carson, Phillips, Yuma	117 min
May 27, 1:45 PM MDT	Mesoscale Discussion	SPC	Baca, Bent, Crowley, Kiowa, Las Animas, Otero and 1 more	2 hr
May 27, 4:27 PM MDT	Severe Thunderstorm Watch	SPC	Baca, Bent, Las Animas, Otero, Prowers	6 hr
May 26, 6:38 PM MDT	Severe Thunderstorm Watch	SPC	Chase, Dundy, Hayes, Hitchcock	7 hr

Nearby

Mesoscale Discussions in Colorado, 2017 Mesoscale Discussions in Nebraska, 2017 Mesoscale Discussions in Wyoming, 2017 Every mesoscale discussion in 2017

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.