Alert archive / Colorado / Mesoscale Discussions in 2020

Mesoscale Discussion 1408

August 5, 202015 counties in Colorado; 4 counties in Nebraska; 5 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Aug 5, 2020, 5:21 PM MDT for 15 counties in Colorado; 4 counties in Nebraska; 5 counties in Wyoming. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Aug 5, 2020, 5:21 PM MDT (23:21 UTC)
Expired: Aug 5, 2020, 6:45 PM MDT
In force: 84 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 419

All 24 counties

Adams County, CO, Arapahoe County, CO, Broomfield County, CO, Cheyenne County, CO, Crowley County, CO, Denver County, CO, Douglas County, CO, El Paso County, CO, Elbert County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Pueblo County, CO, Washington County, CO, Weld County, CO, Banner County, NE, Kimball County, NE, Scotts Bluff County, NE, Sioux County, NE, Converse County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 9 km from the middle of the area, began a volume at 23:21 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 (KDNR), launched 12:00Z, 11.4 hours before the alert went out and 195 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: 407 J/kg
Mixed-layer CIN: -325 J/kg
Mixed-layer LCL: 1531 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Aug 4, 8:30 PM MDT	Mesoscale Discussion	SPC	Baca, Bent, Cheyenne, Crowley, Kiowa, Las Animas and 3 more	30 min
Aug 5, 12:27 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Boulder, Broomfield, Cheyenne, Clear Creek and 23 more	2 hr
Aug 5, 1:26 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Bent, Boulder, Broomfield, Cheyenne and 22 more	8 hr

Nearby

Mesoscale Discussions in Colorado, 2020 Mesoscale Discussions in Wyoming, 2020 Mesoscale Discussions in Nebraska, 2020 Every mesoscale discussion in 2020

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.