Alert archive / Idaho / Mesoscale Discussions in 2018

Mesoscale Discussion 588

May 31, 201829 counties in Idaho; 11 counties in Montana; Teton County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at May 31, 2018, 12:33 PM MDT for 29 counties in Idaho; 11 counties in Montana; Teton County, Wyoming. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: May 31, 2018, 12:33 PM MDT (18:33 UTC)
Expired: May 31, 2018, 2:30 PM MDT
In force: 117 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 41 counties

Ada County, ID, Bannock County, ID, Bingham County, ID, Blaine County, ID, Boise County, ID, Bonneville County, ID, Butte County, ID, Camas County, ID, Caribou County, ID, Cassia County, ID, Clark County, ID, Custer County, ID, Elmore County, ID, Fremont County, ID, Gem County, ID, Gooding County, ID, Idaho County, ID, Jefferson County, ID, Jerome County, ID, Lemhi County, ID, Lincoln County, ID, Madison County, ID, Minidoka County, ID, Oneida County, ID, Owyhee County, ID, Power County, ID, Teton County, ID, Twin Falls County, ID, Valley County, ID, Beaverhead County, MT, Broadwater County, MT, Deer Lodge County, MT, Gallatin County, MT, Granite County, MT, Jefferson County, MT, Madison County, MT, Park County, MT, Powell County, MT, Ravalli County, MT, Silver Bow County, MT, Teton County, WY

The radar

The Pocatello radar (KSFX), 177 km from the middle of the area, began a volume at 18:33 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Boise Airport, ID (KBOI), launched 12:00Z, 6.6 hours before the alert went out and 257 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: 15 J/kg
Mixed-layer CIN: -332 J/kg
Mixed-layer LCL: 1253 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 169 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, 1:10 PM MDT	Severe Thunderstorm Watch	SPC	Bannock, Bear Lake, Bingham, Blaine, Bonneville, Butte and 14 more	7 hr
May 31, 4:35 PM MDT	Mesoscale Discussion	SPC	Bannock, Bear Lake, Bingham, Bonneville, Caribou, Cassia and 9 more	85 min
May 31, 1:47 PM MDT	Mesoscale Discussion	SPC	Carter, Dawson, Fallon, Wibaux	118 min
May 31, 1:50 PM MDT	Severe Thunderstorm Watch	SPC	Beaverhead, Big Horn, Broadwater, Carbon, Carter, Cascade and 25 more	8 hr
May 31, 5:27 PM MDT	Mesoscale Discussion	SPC	Big Horn, Carbon, Custer, Gallatin, Golden Valley, Madison and 10 more	93 min
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 Montana, 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.