Alert archive / Montana / Mesoscale Discussions in 2005

Mesoscale Discussion 1747

July 13, 20059 counties in Montana; 4 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2005, 9:55 PM MDT for 9 counties in Montana; 4 counties in North Dakota. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Jul 13, 2005, 9:55 PM MDT (03:55 UTC)
Expired: Jul 13, 2005, 11:00 PM MDT
In force: 65 min
Issued by: the Storm Prediction Center

Counties Daniels County, MT, Dawson County, MT, Garfield County, MT, McCone County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Wibaux County, MT, Burke County, ND, Divide County, ND, McKenzie County, ND, Williams County, ND

The radar

The Glasgow radar (KGGW), 97 km from the middle of the area, began a volume at 03:57 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, 3.9 hours before the alert went out and 97 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: 708 J/kg
Mixed-layer CIN: -288 J/kg
Mixed-layer LCL: 2696 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 90 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 13, 7:44 PM MDT	Mesoscale Discussion	SPC	Custer, Dawson, Fallon, Fergus, Gallatin, Garfield and 18 more	91 min
Jul 13, 7:55 PM MDT	Severe Thunderstorm Watch	SPC	Dawson, Prairie, Richland, Roosevelt, Sheridan, Wibaux	3 hr
Jul 14, 1:44 PM MDT	Mesoscale Discussion	SPC	Barnes, Benson, Burleigh, Cass, Cavalier, Dickey and 22 more	61 min
Jul 14, 2:40 PM MDT	Severe Thunderstorm Watch	SPC	Barnes, Cass, Eddy, Foster, Grand Forks, Griggs and 8 more	6 hr
Jul 14, 5:27 PM MDT	Mesoscale Discussion	SPC	Barnes, Cass, Eddy, Foster, Grand Forks, Griggs and 8 more	93 min

Nearby

Mesoscale Discussions in Montana, 2005 Mesoscale Discussions in North 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.