Alert archive / Colorado / Mesoscale Discussions in 2011

Mesoscale Discussion 1529

July 6, 201117 counties in Colorado; Cheyenne County, Sherman County, Kansas; 16 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 6, 2011, 5:16 PM MDT for 17 counties in Colorado; Cheyenne County, Sherman County, Kansas; 16 counties in Nebraska. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Jul 6, 2011, 5:16 PM MDT (23:16 UTC)
Expired: Jul 6, 2011, 7:15 PM MDT
In force: 119 min
Issued by: the Storm Prediction Center

All 35 counties

Bent County, CO, Cheyenne County, CO, Crowley County, CO, El Paso County, CO, Elbert County, CO, Kiowa County, CO, Kit Carson County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Otero County, CO, Phillips County, CO, Prowers County, CO, Pueblo County, CO, Sedgwick County, CO, Washington County, CO, Yuma County, CO, Cheyenne County, KS, Sherman County, KS, Arthur County, NE, Box Butte County, NE, Chase County, NE, Cherry County, NE, Cheyenne County, NE, Deuel County, NE, Dundy County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Sheridan County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 158 km from the middle of the area, began a volume at 23:19 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.3 hours before the alert went out and 117 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: 156 J/kg
Mixed-layer CIN: -274 J/kg
Mixed-layer LCL: 1327 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -42 m²/s²
0-3 km storm-relative helicity: 48 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 5, 6:01 PM MDT	Severe Thunderstorm Watch	SPC	Logan, Morgan, Phillips, Sedgwick, Washington	4 hr
Jul 5, 7:23 PM MDT	Mesoscale Discussion	SPC	Logan, Phillips, Sedgwick, Washington, Yuma	2 hr
Jul 5, 9:41 PM MDT	Mesoscale Discussion	SPC	Phillips, Yuma	2 hr
Jul 6, 2:38 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Bent, Boulder, Broomfield, Cheyenne and 21 more	67 min
Jul 6, 2:56 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Bent, Cheyenne, Crowley, Elbert and 14 more	8 hr
Jul 5, 6:07 PM MDT	Mesoscale Discussion	SPC	Atchison, Brown, Cheyenne, Clay, Cloud, Decatur and 26 more	113 min
Jul 5, 7:02 PM MDT	Severe Thunderstorm Watch	SPC	Allen, Anderson, Atchison, Butler, Chase, Clay and 28 more	7 hr

Nearby

Mesoscale Discussions in Colorado, 2011 Mesoscale Discussions in Nebraska, 2011 Mesoscale Discussions in Kansas, 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.