Alert archive / Montana / Mesoscale Discussions in 2004

Mesoscale Discussion 1392

June 23, 200433 counties in Montana; Big Horn County, Park County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 23, 2004, 1:31 PM MDT for 33 counties in Montana; Big Horn County, Park County, Wyoming. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Jun 23, 2004, 1:31 PM MDT (19:31 UTC)
Expired: Jun 23, 2004, 3:00 PM MDT
In force: 89 min
Issued by: the Storm Prediction Center

All 35 counties

Big Horn County, MT, Broadwater County, MT, Carbon County, MT, Cascade County, MT, Chouteau County, MT, Fergus County, MT, Flathead County, MT, Gallatin County, MT, Glacier County, MT, Golden Valley County, MT, Hill County, MT, Jefferson County, MT, Judith Basin County, MT, Lake County, MT, Lewis and Clark County, MT, Liberty County, MT, Lincoln County, MT, Madison County, MT, Meagher County, MT, Musselshell County, MT, Park County, MT, Petroleum County, MT, Pondera County, MT, Powell County, MT, Rosebud County, MT, Silver Bow County, MT, Stillwater County, MT, Sweet Grass County, MT, Teton County, MT, Toole County, MT, Treasure County, MT, Wheatland County, MT, Yellowstone County, MT, Big Horn County, WY, Park County, WY

The radar

The Great Falls radar (KTFX), 111 km from the middle of the area, began a volume at 19:33 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, 7.5 hours before the alert went out and 71 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: 1732 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 140 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
Jun 23, 3:45 PM MDT	Mesoscale Discussion	SPC	Big Horn, Broadwater, Carbon, Cascade, Flathead, Glacier and 14 more	2 hr

Nearby

Mesoscale Discussions in Montana, 2004 Mesoscale Discussions in Wyoming, 2004 Every mesoscale discussion in 2004

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.