Alert archive / Idaho / Mesoscale Discussions in 2014

Mesoscale Discussion 1417

July 21, 201418 counties in Idaho; 10 counties in Montana; Big Horn County, Park County, Teton County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2014, 12:25 PM MDT for 18 counties in Idaho; 10 counties in Montana; Big Horn County, Park County, Teton County, Wyoming. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jul 21, 2014, 12:25 PM MDT (18:25 UTC)
Expired: Jul 21, 2014, 3:00 PM MDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 5%

All 31 counties

Bannock County, ID, Bingham County, ID, Blaine County, ID, Bonneville County, ID, Butte County, ID, Caribou County, ID, Cassia County, ID, Clark County, ID, Franklin County, ID, Fremont County, ID, Jefferson County, ID, Jerome County, ID, Lincoln County, ID, Madison County, ID, Minidoka County, ID, Power County, ID, Teton County, ID, Twin Falls County, ID, Beaverhead County, MT, Carbon County, MT, Gallatin County, MT, Golden Valley County, MT, Madison County, MT, Park County, MT, Stillwater County, MT, Sweet Grass County, MT, Wheatland County, MT, Yellowstone County, MT, Big Horn County, WY, Park County, WY, Teton County, WY

The radar

The Pocatello radar (KSFX), 179 km from the middle of the area, began a volume at 18:27 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 6.4 hours before the alert went out and 375 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: 3238 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 181 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 Idaho, 2014 Mesoscale Discussions in Montana, 2014 Mesoscale Discussions in Wyoming, 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.