Alert archive / Utah / Mesoscale Discussions in 2016

Mesoscale Discussion 1490

August 7, 20164 states

The Storm Prediction Center issued this mesoscale discussion at Aug 7, 2016, 11:39 AM MDT for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Aug 7, 2016, 11:39 AM MDT (17:39 UTC)
Expired: Aug 7, 2016, 2:15 PM MDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 5%

All 27 counties

Bannock County, ID, Bear Lake County, ID, Bonneville County, ID, Caribou County, ID, Franklin County, ID, Teton County, ID, Carbon County, MT, Stillwater County, MT, Cache County, UT, Carbon County, UT, Daggett County, UT, Davis County, UT, Duchesne County, UT, Morgan County, UT, Rich County, UT, Salt Lake County, UT, Sanpete County, UT, Summit County, UT, Utah County, UT, Wasatch County, UT, Weber County, UT, Hot Springs County, WY, Lincoln County, WY, Park County, WY, Sublette County, WY, Teton County, WY, Uinta County, WY

The radar

The Riverton/Lander radar (KRIW), 121 km from the middle of the area, began a volume at 17:42 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

Riverton, WY (KRIW), launched 12:00Z, 5.7 hours before the alert went out and 127 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: 2103 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 7, 1:52 PM MDT	Mesoscale Discussion	SPC	Beaverhead, Broadwater, Cascade, Chouteau, Deer Lodge, Fergus and 23 more	2 hr
Aug 7, 5:26 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Fallon, Powder River, Wibaux	2 hr
Aug 7, 2:07 PM MDT	Mesoscale Discussion	SPC	Daggett, Uintah	2 hr

Nearby

Mesoscale Discussions in Utah, 2016 Mesoscale Discussions in Idaho, 2016 Mesoscale Discussions in Wyoming, 2016 Every mesoscale discussion in 2016

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.