Alert archive / Wyoming / Mesoscale Discussions in 2018

Mesoscale Discussion 389

May 11, 2018Larimer County, Weld County, Colorado; 4 counties in Nebraska; 6 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at May 11, 2018, 5:39 PM MDT for Larimer County, Weld County, Colorado; 4 counties in Nebraska; 6 counties in Wyoming. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: May 11, 2018, 5:39 PM MDT (23:39 UTC)
Expired: May 11, 2018, 7:15 PM MDT
In force: 96 min
Issued by: the Storm Prediction Center

Counties Larimer County, CO, Weld County, CO, Banner County, NE, Kimball County, NE, Scotts Bluff County, NE, Sioux County, NE, Albany County, WY, Converse County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 50 km from the middle of the area, began a volume at 23:42 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 nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 11.7 hours before the alert went out and 244 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: 1147 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -91 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 10, 6:06 PM MDT	Mesoscale Discussion	SPC	Cheyenne, Kit Carson, Lincoln, Washington, Yuma	114 min
May 10, 6:59 PM MDT	Severe Thunderstorm Watch	SPC	Yuma	9 hr
May 11, 12:00 PM MDT	Mesoscale Discussion	SPC	Boulder, Broomfield, Larimer, Weld	2 hr
May 11, 2:02 PM MDT	Severe Thunderstorm Watch	SPC	Larimer, Weld	7 hr
May 10, 6:39 PM MDT	Mesoscale Discussion	SPC	Adams, Arthur, Blaine, Buffalo, Chase, Custer and 25 more	2 hr
May 10, 10:16 PM MDT	Mesoscale Discussion	SPC	Adams, Antelope, Boone, Buffalo, Chase, Custer and 19 more	89 min
May 11, 12:13 AM MDT	Mesoscale Discussion	SPC	Butler, Cass, Douglas, Gage, Jefferson, Johnson and 7 more	92 min
May 11, 12:50 AM MDT	Severe Thunderstorm Watch	SPC	Butler, Cass, Gage, Jefferson, Johnson, Lancaster and 6 more	3 hr
May 11, 3:24 AM MDT	Mesoscale Discussion	SPC	Adams, Butler, Cass, Clay, Colfax, Douglas and 22 more	66 min

Nearby

Mesoscale Discussions in Wyoming, 2018 Mesoscale Discussions in Nebraska, 2018 Mesoscale Discussions in Colorado, 2018 Every mesoscale discussion in 2018

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.