Alert archive / Montana / Mesoscale Discussions in 2004

Mesoscale Discussion 1909

August 6, 2004Rosebud County, Treasure County, Montana

The Storm Prediction Center issued this mesoscale discussion at Aug 6, 2004, 8:36 PM MDT for Rosebud County, Treasure County, Montana. It was in force for 24 min.

The area

The outline as issued.

The facts

Issued
Aug 6, 2004, 8:36 PM MDT (02:36 UTC)
Expired
Aug 6, 2004, 9:00 PM MDT
In force
24 min
Issued by
the Storm Prediction Center

Counties Rosebud County, MT, Treasure County, MT

The radar

The Billings radar (KBLX), 113 km from the middle of the area, began a volume at 02:35 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 00:00Z, 2.6 hours before the alert went out and 296 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-pSkew-T log-p diagram, Great_falls, MT at 00:00Z on 2004-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Great_falls, MT at 00:00Z on 2004-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
4495 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
32 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.

IssuedProductOfficeCountiesLasted
Aug 6, 7:22 PM MDTMesoscale DiscussionSPCBig Horn, Musselshell, Rosebud, Treasure, Yellowstone53 min
Aug 7, 1:28 AM MDTMesoscale DiscussionSPCFlathead, Lake, Lincoln, Mineral, Sanders92 min

Nearby

Mesoscale Discussions in Montana, 2004Every 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.