Alert archive / Colorado / Mesoscale Discussions in 2011

Mesoscale Discussion 1527

July 6, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jul 6, 2011, 2:38 PM MDT for 4 states. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Jul 6, 2011, 2:38 PM MDT (20:38 UTC)
Expired: Jul 6, 2011, 3:45 PM MDT
In force: 67 min
Issued by: the Storm Prediction Center

All 41 counties

Adams County, CO, Arapahoe County, CO, Bent County, CO, Boulder County, CO, Broomfield County, CO, Cheyenne County, CO, Crowley County, CO, Denver County, CO, Douglas County, CO, El Paso County, CO, Elbert County, CO, Jefferson County, CO, Kiowa County, CO, Kit Carson County, CO, Las Animas 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, Teller County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Cheyenne County, KS, Greeley County, KS, Sherman County, KS, Wallace County, KS, Banner County, NE, Chase County, NE, Cheyenne County, NE, Deuel County, NE, Dundy County, NE, Garden County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Laramie County, WY

The radar

The Denver radar (KFTG), 79 km from the middle of the area, began a volume at 20:38 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.

Severe Thunderstorm Watch 606Jul 6, 3:00 PM MDT

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 8.6 hours before the alert went out and 34 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: 161 J/kg
Mixed-layer CIN: -159 J/kg
Mixed-layer LCL: 1212 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 90 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, 2:56 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Bent, Cheyenne, Crowley, Elbert and 14 more	8 hr
Jul 6, 5:16 PM MDT	Mesoscale Discussion	SPC	Bent, Cheyenne, Crowley, Elbert, El Paso, Kiowa and 11 more	119 min
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
Jul 6, 2:19 PM MDT	Mesoscale Discussion	SPC	Big Horn, Campbell, Crook, Johnson, Sheridan	2 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.