Alert archive / Montana / Mesoscale Discussions in 2005

Mesoscale Discussion 1580

July 1, 200521 counties in Montana; Big Horn County, Johnson County, Sheridan County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 1, 2005, 4:50 PM MDT for 21 counties in Montana; Big Horn County, Johnson County, Sheridan County, Wyoming. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Jul 1, 2005, 4:50 PM MDT (22:50 UTC)
Expired: Jul 1, 2005, 6:15 PM MDT
In force: 85 min
Issued by: the Storm Prediction Center

All 24 counties

Big Horn County, MT, Broadwater County, MT, Carbon County, MT, Custer County, MT, Fergus County, MT, Gallatin County, MT, Garfield County, MT, Golden Valley County, MT, Judith Basin County, MT, Meagher County, MT, Musselshell County, MT, Park County, MT, Petroleum County, MT, Powder River County, MT, Prairie County, MT, Rosebud County, MT, Stillwater County, MT, Sweet Grass County, MT, Treasure County, MT, Wheatland County, MT, Yellowstone County, MT, Big Horn County, WY, Johnson County, WY, Sheridan County, WY

The radar

The Billings radar (KBLX), 38 km from the middle of the area, began a volume at 22:53 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, 10.8 hours before the alert went out and 210 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: 2442 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 185 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 1, 5:02 PM MDT	Mesoscale Discussion	SPC	Fallon, Richland, Sheridan, Wibaux	88 min

Nearby

Mesoscale Discussions in Montana, 2005 Mesoscale Discussions in Wyoming, 2005 Every mesoscale discussion in 2005

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.