Alert archive / Idaho / Mesoscale Discussions in 2018

Mesoscale Discussion 598

May 31, 201815 counties in Idaho; Park County, Teton County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at May 31, 2018, 4:35 PM MDT for 15 counties in Idaho; Park County, Teton County, Wyoming. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: May 31, 2018, 4:35 PM MDT (22:35 UTC)
Expired: May 31, 2018, 6:00 PM MDT
In force: 85 min
Issued by: the Storm Prediction Center

Counties Bannock County, ID, Bear Lake County, ID, Bingham County, ID, Bonneville County, ID, Caribou County, ID, Cassia County, ID, Clark County, ID, Franklin County, ID, Fremont County, ID, Jefferson County, ID, Madison County, ID, Minidoka County, ID, Oneida County, ID, Power County, ID, Teton County, ID, Park County, WY, Teton County, WY

The radar

The Pocatello radar (KSFX), 73 km from the middle of the area, began a volume at 22:35 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, 10.6 hours before the alert went out and 275 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: 1930 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 172 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
May 31, 12:33 PM MDT	Mesoscale Discussion	SPC	Ada, Bannock, Bingham, Blaine, Boise, Bonneville and 23 more	117 min
May 31, 1:10 PM MDT	Severe Thunderstorm Watch	SPC	Bannock, Bear Lake, Bingham, Blaine, Bonneville, Butte and 14 more	7 hr
May 31, 3:55 PM MDT	Mesoscale Discussion	SPC	Campbell, Converse, Crook, Niobrara, Weston	2 hr

Nearby

Mesoscale Discussions in Idaho, 2018 Mesoscale Discussions in Wyoming, 2018 Every mesoscale discussion in 2018

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.