Alert archive / Utah / Mesoscale Discussions in 2011

Mesoscale Discussion 1442

June 29, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jun 29, 2011, 1:41 PM MDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 29, 2011, 1:41 PM MDT (19:41 UTC)
Expired: Jun 29, 2011, 3:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 30 counties

Moffat County, CO, Bear Lake County, ID, Caribou County, ID, Franklin County, ID, Cache County, UT, Carbon County, UT, Daggett County, UT, Davis County, UT, Duchesne County, UT, Emery County, UT, Garfield County, UT, Grand County, UT, Juab County, UT, Morgan County, UT, Piute County, UT, Rich County, UT, Salt Lake County, UT, Sanpete County, UT, Sevier County, UT, Summit County, UT, Uintah County, UT, Utah County, UT, Wasatch County, UT, Wayne County, UT, Weber County, UT, Fremont County, WY, Lincoln County, WY, Sublette County, WY, Sweetwater County, WY, Uinta County, WY

The radar

The Salt Lake City radar (KMTX), 172 km from the middle of the area, began a volume at 19:44 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, 7.7 hours before the alert went out and 106 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: 4031 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 225 m²/s²
0-3 km storm-relative helicity: 258 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
Jun 29, 2:41 PM MDT	Mesoscale Discussion	SPC	Montezuma	2 hr
Jun 29, 12:35 PM MDT	Mesoscale Discussion	SPC	Clearwater, Idaho, Lemhi, Valley	115 min

Nearby

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