Alert archive / Idaho / Mesoscale Discussions in 2018

Mesoscale Discussion 364

May 6, 20184 states

The Storm Prediction Center issued this mesoscale discussion at May 6, 2018, 2:50 PM MDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 6, 2018, 2:50 PM MDT (20:50 UTC)
Expired
May 6, 2018, 5:15 PM MDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
5%
All 27 counties

Adams County, ID, Boise County, ID, Canyon County, ID, Clearwater County, ID, Custer County, ID, Gem County, ID, Idaho County, ID, Latah County, ID, Lemhi County, ID, Lewis County, ID, Nez Perce County, ID, Payette County, ID, Valley County, ID, Washington County, ID, Beaverhead County, MT, Deer Lodge County, MT, Granite County, MT, Mineral County, MT, Ravalli County, MT, Silver Bow County, MT, Baker County, OR, Grant County, OR, Union County, OR, Wallowa County, OR, Asotin County, WA, Columbia County, WA, Garfield County, WA

The radar

The Boise radar (KCBX), 185 km from the middle of the area, began a volume at 20:50 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

Spokane, WA (KOTX), launched 12:00Z, 8.8 hours before the alert went out and 293 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, Spokane, WA at 12:00Z on 2018-05-06Temperature 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, Spokane, WA at 12:00Z on 2018-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 square meters per square second.1939Sfc1 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
1989 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
48 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 Idaho, 2018Mesoscale Discussions in Montana, 2018Mesoscale Discussions in Oregon, 2018Every 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.