Alert archive / Montana / Mesoscale Discussions in 2015

Mesoscale Discussion 853

May 31, 2015Idaho County, Lemhi County, Idaho; 20 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at May 31, 2015, 3:23 PM PDT for Idaho County, Lemhi County, Idaho; 20 counties in Montana. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
May 31, 2015, 3:23 PM PDT (22:23 UTC)
Expired
May 31, 2015, 5:00 PM PDT
In force
97 min
Issued by
the Storm Prediction Center
Chance of a watch
5%
All 22 counties

Idaho County, ID, Lemhi County, ID, Beaverhead County, MT, Broadwater County, MT, Carbon County, MT, Deer Lodge County, MT, Gallatin County, MT, Golden Valley County, MT, Granite County, MT, Jefferson County, MT, Judith Basin County, MT, Madison County, MT, Meagher County, MT, Musselshell County, MT, Park County, MT, Powell County, MT, Ravalli County, MT, Silver Bow County, MT, Stillwater County, MT, Sweet Grass County, MT, Wheatland County, MT, Yellowstone County, MT

The radar

The Missoula radar (KMSX), 195 km from the middle of the area, began a volume at 22:25 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

Boise Airport, ID (KBOI), launched 12:00Z, 10.4 hours before the alert went out and 371 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, Boise Airport, ID at 12:00Z on 2015-05-31Temperature 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, Boise Airport, ID at 12:00Z on 2015-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 square meters per square second.193958Sfc1 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
2117 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
47 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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Nearby

Mesoscale Discussions in Montana, 2015Mesoscale Discussions in Idaho, 2015Every mesoscale discussion in 2015

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.