Alert archive / Montana / Mesoscale Discussions in 2005

Mesoscale Discussion 1423

June 22, 200520 counties in Montana; 9 counties in North Dakota; Butte County, Harding County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 22, 2005, 1:15 AM MDT for 20 counties in Montana; 9 counties in North Dakota; Butte County, Harding County, South Dakota. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jun 22, 2005, 1:15 AM MDT (07:15 UTC)
Expired: Jun 22, 2005, 2:15 AM MDT
In force: 60 min
Issued by: the Storm Prediction Center

All 31 counties

Carter County, MT, Custer County, MT, Daniels County, MT, Dawson County, MT, Fallon County, MT, Garfield County, MT, McCone County, MT, Musselshell County, MT, Petroleum County, MT, Phillips County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Rosebud County, MT, Sheridan County, MT, Treasure County, MT, Valley County, MT, Wibaux County, MT, Yellowstone County, MT, Billings County, ND, Bowman County, ND, Burke County, ND, Divide County, ND, Dunn County, ND, Golden Valley County, ND, McKenzie County, ND, Slope County, ND, Williams County, ND, Butte County, SD, Harding County, SD

The radar

The Glasgow radar (KGGW), 80 km from the middle of the area, began a volume at 07:16 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

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 7.3 hours before the alert went out and 81 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: 3645 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 1501 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 106 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 8.8

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 21, 6:32 PM MDT	Mesoscale Discussion	SPC	Custer, Garfield, McCone, Petroleum, Phillips, Prairie and 2 more	88 min
Jun 21, 7:00 PM MDT	Severe Thunderstorm Watch	SPC	Custer, Daniels, Dawson, Fallon, Garfield, McCone and 11 more	7 hr
Jun 21, 9:32 PM MDT	Mesoscale Discussion	SPC	Cascade, Chouteau, Hill, Lewis and Clark, Liberty, Pondera and 3 more	58 min
Jun 21, 10:26 PM MDT	Mesoscale Discussion	SPC	Custer, Daniels, Dawson, Fallon, Garfield, McCone and 9 more	64 min
Jun 22, 2:50 PM MDT	Mesoscale Discussion	SPC	Blaine, Broadwater, Cascade, Chouteau, Fergus, Gallatin and 15 more	115 min
Jun 22, 3:50 PM MDT	Severe Thunderstorm Watch	SPC	Blaine, Broadwater, Cascade, Chouteau, Daniels, Fergus and 20 more	7 hr

Nearby

Mesoscale Discussions in Montana, 2005 Mesoscale Discussions in North Dakota, 2005 Mesoscale Discussions in South Dakota, 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.