Alert archive / Colorado / Mesoscale Discussions in 2011

Mesoscale Discussion 1261

June 17, 20118 counties in Colorado

The Storm Prediction Center issued this mesoscale discussion at Jun 17, 2011, 12:17 PM MDT for 8 counties in Colorado. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Jun 17, 2011, 12:17 PM MDT (18:17 UTC)
Expired: Jun 17, 2011, 1:45 PM MDT
In force: 88 min
Issued by: the Storm Prediction Center

Counties Arapahoe 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

The radar

The Pueblo radar (KPUX), 83 km from the middle of the area, began a volume at 18:20 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 492Jun 17, 12:55 PM MDT

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 6.3 hours before the alert went out and 94 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: 5 J/kg
Mixed-layer CIN: -173 J/kg
Mixed-layer LCL: 1450 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

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
Jun 16, 7:26 PM MDT	Mesoscale Discussion	SPC	Logan, Morgan, Sedgwick, Weld	64 min
Jun 17, 12:58 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Bent, Cheyenne, Crowley, Denver and 11 more	9 hr
Jun 17, 4:59 PM MDT	Mesoscale Discussion	SPC	Cheyenne, Crowley, Elbert, El Paso, Kiowa, Kit Carson and 2 more	61 min
Jun 17, 5:23 PM MDT	Severe Thunderstorm Watch	SPC	Cheyenne, Kit Carson	8 hr

Nearby

Mesoscale Discussions in Colorado, 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.