Alert archive / Montana / Mesoscale Discussions in 2011

Mesoscale Discussion 1608

July 13, 2011Lemhi County, Idaho; 27 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2011, 5:13 PM MDT for Lemhi County, Idaho; 27 counties in Montana. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Jul 13, 2011, 5:13 PM MDT (23:13 UTC)
Expired: Jul 13, 2011, 6:15 PM MDT
In force: 62 min
Issued by: the Storm Prediction Center

All 28 counties

Lemhi County, ID, Beaverhead County, MT, Blaine County, MT, Broadwater County, MT, Cascade County, MT, Chouteau County, MT, Deer Lodge County, MT, Flathead County, MT, Glacier County, MT, Granite County, MT, Hill County, MT, Jefferson County, MT, Judith Basin County, MT, Lake County, MT, Lewis and Clark County, MT, Liberty County, MT, Madison County, MT, Meagher County, MT, Missoula County, MT, Pondera County, MT, Powell County, MT, Ravalli County, MT, Silver Bow County, MT, Stillwater County, MT, Sweet Grass County, MT, Teton County, MT, Toole County, MT, Wheatland County, MT

The radar

The Great Falls radar (KTFX), 109 km from the middle of the area, began a volume at 23:13 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, 11.2 hours before the alert went out and 131 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: 6 J/kg
Mixed-layer CIN: -325 J/kg
Mixed-layer LCL: 1669 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 16 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 13, 12:36 PM MDT	Mesoscale Discussion	SPC	Custer, Lemhi	114 min
Jul 13, 1:45 PM MDT	Severe Thunderstorm Watch	SPC	Lemhi	7 hr
Jul 12, 7:17 PM MDT	Mesoscale Discussion	SPC	Blaine, Cascade, Chouteau, Fergus, Granite, Hill and 8 more	58 min

Nearby

Mesoscale Discussions in Montana, 2011 Mesoscale Discussions in Idaho, 2011 Every mesoscale discussion in 2011

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.