Alert archive / Wyoming / Mesoscale Discussions in 2012

Mesoscale Discussion 1450

July 11, 2012Teton County, Idaho; 9 counties in Montana; 12 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 11, 2012, 12:43 PM MDT for Teton County, Idaho; 9 counties in Montana; 12 counties in Wyoming. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Jul 11, 2012, 12:43 PM MDT (18:43 UTC)
Expired: Jul 11, 2012, 2:15 PM MDT
In force: 92 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 22 counties

Teton County, ID, Big Horn County, MT, Carbon County, MT, Park County, MT, Powder River County, MT, Rosebud County, MT, Stillwater County, MT, Sweet Grass County, MT, Treasure County, MT, Yellowstone County, MT, Big Horn County, WY, Campbell County, WY, Crook County, WY, Fremont County, WY, Hot Springs County, WY, Johnson County, WY, Natrona County, WY, Park County, WY, Sheridan County, WY, Sublette County, WY, Teton County, WY, Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 175 km from the middle of the area, began a volume at 18:42 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, 6.7 hours before the alert went out and 172 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: 3038 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 72 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 11, 4:36 PM MDT	Mesoscale Discussion	SPC	Daniels, Dawson, McCone, Richland, Roosevelt, Sheridan and 2 more	54 min

Nearby

Mesoscale Discussions in Wyoming, 2012 Mesoscale Discussions in Montana, 2012 Mesoscale Discussions in Idaho, 2012 Every mesoscale discussion in 2012

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.