Alert archive / Montana / Mesoscale Discussions in 2005

Mesoscale Discussion 1422

June 21, 200515 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2005, 10:26 PM MDT for 15 counties in Montana. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Jun 21, 2005, 10:26 PM MDT (04:26 UTC)
Expired: Jun 21, 2005, 11:30 PM MDT
In force: 64 min
Issued by: the Storm Prediction Center

Counties Custer County, MT, Daniels County, MT, Dawson County, MT, Fallon County, MT, Garfield County, MT, McCone County, MT, Petroleum County, MT, Phillips County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Rosebud County, MT, Sheridan County, MT, Treasure County, MT, Valley County, MT

The radar

The Glasgow radar (KGGW), 99 km from the middle of the area, began a volume at 04:29 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

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 4.4 hours before the alert went out and 99 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 22, 1:15 AM MDT	Mesoscale Discussion	SPC	Carter, Custer, Daniels, Dawson, Fallon, Garfield and 14 more	60 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 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.