Alert archive / Montana / Mesoscale Discussions in 2004

Mesoscale Discussion 1911

August 7, 2004Bonner County, Boundary County, Shoshone County, Idaho; 5 counties in Montana; Pend Oreille County, Stevens County, Washington

The Storm Prediction Center issued this mesoscale discussion at Aug 7, 2004, 12:28 AM PDT for Bonner County, Boundary County, Shoshone County, Idaho; 5 counties in Montana; Pend Oreille County, Stevens County, Washington. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Aug 7, 2004, 12:28 AM PDT (07:28 UTC)
Expired: Aug 7, 2004, 2:00 AM PDT
In force: 92 min
Issued by: the Storm Prediction Center

Counties Bonner County, ID, Boundary County, ID, Shoshone County, ID, Flathead County, MT, Lake County, MT, Lincoln County, MT, Mineral County, MT, Sanders County, MT, Pend Oreille County, WA, Stevens County, WA

The radar

The Spokane radar (KOTX), 154 km from the middle of the area, began a volume at 07:29 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

Spokane, WA (KOTX), launched 00:00Z, 7.5 hours before the alert went out and 70 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1321 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 86 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
Aug 6, 6:22 PM PDT	Mesoscale Discussion	SPC	Big Horn, Musselshell, Rosebud, Treasure, Yellowstone	53 min
Aug 6, 7:36 PM PDT	Mesoscale Discussion	SPC	Rosebud, Treasure	24 min

Nearby

Mesoscale Discussions in Montana, 2004 Mesoscale Discussions in Idaho, 2004 Mesoscale Discussions in Washington, 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.