Alert archive / Colorado / Mesoscale Discussions in 2011

Mesoscale Discussion 1457

June 30, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2011, 7:25 PM MDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 30, 2011, 7:25 PM MDT (01:25 UTC)
Expired: Jun 30, 2011, 9:30 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 55 counties

Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Chaffee County, CO, Clear Creek County, CO, Denver County, CO, Douglas County, CO, Eagle County, CO, El Paso County, CO, Elbert County, CO, Fremont County, CO, Gilpin County, CO, Grand County, CO, Jefferson County, CO, Lake County, CO, Larimer County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Park County, CO, Phillips County, CO, Sedgwick County, CO, Summit County, CO, Teller County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Arthur County, NE, Banner County, NE, Box Butte County, NE, Chase County, NE, Cherry County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hooker County, NE, Keith County, NE, Kimball County, NE, Lincoln County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Bennett County, SD, Fall River County, SD, Jackson County, SD, Oglala Lakota County, SD, Goshen County, WY, Laramie County, WY

The radar

The Cheyenne radar (KCYS), 86 km from the middle of the area, began a volume at 01:28 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 00:00Z, 1.4 hours before the alert went out and 109 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: 3175 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 121 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
Jul 1, 11:59 AM MDT	Mesoscale Discussion	SPC	Boyd, Cedar, Knox	61 min
Jul 1, 2:47 PM MDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Cheyenne, Deuel, Garden and 6 more	58 min
Jun 30, 8:58 PM MDT	Mesoscale Discussion	SPC	Beadle, Brule, Buffalo, Hughes, Jerauld, Jones and 4 more	32 min
Jun 30, 9:07 PM MDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Brule, Buffalo, Clark, Codington and 16 more	3 hr
Jul 1, 1:08 PM MDT	Severe Thunderstorm Watch	SPC	Brookings, Codington, Deuel, Grant, Hamlin, Kingsbury and 8 more	9 hr

Nearby

Mesoscale Discussions in Colorado, 2011 Mesoscale Discussions in Nebraska, 2011 Mesoscale Discussions in South Dakota, 2011 Every mesoscale discussion in 2011

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.