Alert archive / Montana / Mesoscale Discussions in 2013

Mesoscale Discussion 1306

June 29, 20139 counties in Idaho; 18 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jun 29, 2013, 1:34 PM MDT for 9 counties in Idaho; 18 counties in Montana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jun 29, 2013, 1:34 PM MDT (19:34 UTC)
Expired
Jun 29, 2013, 4:00 PM MDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 27 counties

Butte County, ID, Clark County, ID, Clearwater County, ID, Custer County, ID, Fremont County, ID, Idaho County, ID, Jefferson County, ID, Lemhi County, ID, Valley County, ID, Beaverhead County, MT, Broadwater County, MT, Cascade County, MT, Deer Lodge County, MT, Gallatin County, MT, Granite County, MT, Jefferson County, MT, Judith Basin County, MT, Lewis and Clark County, MT, Madison County, MT, Meagher County, MT, Missoula County, MT, Park County, MT, Powell County, MT, Ravalli County, MT, Silver Bow County, MT, Sweet Grass County, MT, Teton County, MT

The radar

The Missoula radar (KMSX), 146 km from the middle of the area, began a volume at 19:36 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

Great_falls, MT (KTFX), launched 12:00Z, 7.6 hours before the alert went out and 260 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, Great_falls, MT at 12:00Z on 2013-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 27 joules per kilogram.LCLLFCEL10008507005003002001001 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, Great_falls, MT at 12:00Z on 2013-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -36 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
27 J/kg
Mixed-layer CIN
-303 J/kg
Mixed-layer LCL
1583 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
-36 m²/s²
0-3 km storm-relative helicity
10 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, 2013Mesoscale Discussions in Idaho, 2013Every mesoscale discussion in 2013

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.