Alert archive / Montana / Mesoscale Discussions in 2014

Mesoscale Discussion 1389

July 15, 2014Fremont County, Teton County, Idaho; 6 counties in Montana; 4 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 15, 2014, 11:49 AM MDT for Fremont County, Teton County, Idaho; 6 counties in Montana; 4 counties in Wyoming. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 15, 2014, 11:49 AM MDT (17:49 UTC)
Expired: Jul 15, 2014, 2:15 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Fremont County, ID, Teton County, ID, Carbon County, MT, Gallatin County, MT, Madison County, MT, Park County, MT, Stillwater County, MT, Sweet Grass County, MT, Big Horn County, WY, Hot Springs County, WY, Park County, WY, Teton County, WY

The radar

The Billings radar (KBLX), 169 km from the middle of the area, began a volume at 17:49 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, 5.8 hours before the alert went out and 208 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: 1771 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 102 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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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 14, 8:16 PM MDT	Mesoscale Discussion	SPC	Bonneville, Butte, Clark, Custer, Fremont, Jefferson and 3 more	59 min
Jul 15, 1:29 PM MDT	Mesoscale Discussion	SPC	Albany, Laramie, Platte	3 hr

Nearby

Mesoscale Discussions in Montana, 2014 Mesoscale Discussions in Wyoming, 2014 Mesoscale Discussions in Idaho, 2014 Every mesoscale discussion in 2014

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.