Alert archive / Utah / Mesoscale Discussions in 2017

Mesoscale Discussion 658

May 6, 20175 states

The Storm Prediction Center issued this mesoscale discussion at May 6, 2017, 2:30 PM MST for 5 states. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
May 6, 2017, 2:30 PM MST (21:30 UTC)
Expired
May 6, 2017, 3:30 PM MST
In force
60 min
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 27 counties

Apache County, AZ, Dolores County, CO, Montezuma County, CO, Cibola County, NM, McKinley County, NM, San Juan County, NM, Elko County, NV, Eureka County, NV, White Pine County, NV, Carbon County, UT, Davis County, UT, Duchesne County, UT, Emery County, UT, Grand County, UT, Juab County, UT, Millard County, UT, Morgan County, UT, Salt Lake County, UT, San Juan County, UT, Sanpete County, UT, Sevier County, UT, Summit County, UT, Tooele County, UT, Utah County, UT, Wasatch County, UT, Wayne County, UT, Weber County, UT

The radar

The Cedar City radar (KICX), 142 km from the middle of the area, began a volume at 21:31 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, 9.5 hours before the alert went out and 233 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-pSkew-T log-p diagram, Salt Lake City I, UT at 12:00Z on 2017-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salt Lake City I, UT at 12:00Z on 2017-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 118 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
3713 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
118 m²/s²
0-3 km storm-relative helicity
141 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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Nearby

Mesoscale Discussions in Utah, 2017Mesoscale Discussions in Nevada, 2017Mesoscale Discussions in New Mexico, 2017Every mesoscale discussion in 2017

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.