Alert archive / Utah / Mesoscale Discussions in 2011

Mesoscale Discussion 1605

July 13, 2011Mesa County, Moffat County, Rio Blanco County, Colorado; 10 counties in Utah; Sweetwater County, Uinta County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2011, 1:47 PM MDT for Mesa County, Moffat County, Rio Blanco County, Colorado; 10 counties in Utah; Sweetwater County, Uinta County, Wyoming. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Jul 13, 2011, 1:47 PM MDT (19:47 UTC)
Expired: Jul 13, 2011, 3:15 PM MDT
In force: 88 min
Issued by: the Storm Prediction Center

Counties Mesa County, CO, Moffat County, CO, Rio Blanco County, CO, Carbon County, UT, Daggett County, UT, Duchesne County, UT, Emery County, UT, Grand County, UT, San Juan County, UT, Summit County, UT, Uintah County, UT, Wasatch County, UT, Wayne County, UT, Sweetwater County, WY, Uinta County, WY

The radar

The Grand Junction radar (KGJX), 166 km from the middle of the area, began a volume at 19:46 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 7.8 hours before the alert went out and 207 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: 132 J/kg
Mixed-layer CIN: -208 J/kg
Mixed-layer LCL: 2281 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 161 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 13, 2:23 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Broomfield, Cheyenne, Crowley, Denver and 9 more	2 hr
Jul 13, 3:41 PM MDT	Tornado Watch	SPC	Cheyenne, Elbert, Kit Carson, Lincoln	6 hr
Jul 13, 5:13 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Boulder, Broomfield, Clear Creek, Denver and 7 more	6 hr

Nearby

Mesoscale Discussions in Utah, 2011 Mesoscale Discussions in Colorado, 2011 Mesoscale Discussions in Wyoming, 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.