Alert archive / Colorado / Mesoscale Discussions in 2005

Mesoscale Discussion 1640

July 4, 200513 counties in Colorado; 8 counties in Nebraska; Goshen County, Laramie County, Platte County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2005, 11:24 AM MDT for 13 counties in Colorado; 8 counties in Nebraska; Goshen County, Laramie County, Platte County, Wyoming. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 4, 2005, 11:24 AM MDT (17:24 UTC)
Expired: Jul 4, 2005, 1:30 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 24 counties

Adams County, CO, Arapahoe County, CO, Cheyenne County, CO, Elbert County, CO, Kit Carson County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Deuel County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sioux County, NE, Goshen County, WY, Laramie County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 87 km from the middle of the area, began a volume at 17:24 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.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 5.4 hours before the alert went out and 118 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: 15 J/kg
Mixed-layer CIN: -333 J/kg
Mixed-layer LCL: 2102 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 4, 2:00 AM MDT	Mesoscale Discussion	SPC	Kit Carson, Phillips, Sedgwick, Yuma	2 hr
Jul 4, 1:20 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Elbert, Kit Carson, Logan, Morgan and 4 more	8 hr
Jul 4, 2:35 PM MDT	Severe Thunderstorm Watch	SPC	Baca, Bent, Cheyenne, Crowley, El Paso, Kiowa and 5 more	6 hr
Jul 4, 4:21 PM MDT	Mesoscale Discussion	SPC	Baca, Bent, Cheyenne, Crowley, El Paso, Kiowa and 5 more	84 min
Jul 4, 5:44 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Denver, Elbert, Kit Carson, Logan and 6 more	91 min
Jul 3, 7:56 PM MDT	Mesoscale Discussion	SPC	Nemaha, Richardson	64 min
Jul 4, 3:42 PM MDT	Mesoscale Discussion	SPC	Chase, Dawson, Dundy, Frontier, Furnas, Gosper and 7 more	63 min
Jul 4, 4:00 PM MDT	Severe Thunderstorm Watch	SPC	Chase, Dundy, Frontier, Furnas, Hayes, Hitchcock and 2 more	7 hr

Nearby

Mesoscale Discussions in Colorado, 2005 Mesoscale Discussions in Nebraska, 2005 Mesoscale Discussions in Wyoming, 2005 Every mesoscale discussion in 2005

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.