Alert archive / Montana / Mesoscale Discussions in 2011

Mesoscale Discussion 1744

July 25, 2011Dawson County, McCone County, Prairie County, Montana

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2011, 9:07 PM MDT for Dawson County, McCone County, Prairie County, Montana. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Jul 25, 2011, 9:07 PM MDT (03:07 UTC)
Expired: Jul 25, 2011, 10:30 PM MDT
In force: 83 min
Issued by: the Storm Prediction Center

Counties Dawson County, MT, McCone County, MT, Prairie County, MT

The radar

The Glasgow radar (KGGW), 113 km from the middle of the area, began a volume at 03:11 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, 3.1 hours before the alert went out and 113 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: 623 J/kg
Mixed-layer CIN: -251 J/kg
Mixed-layer LCL: 2277 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 197 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 26, 9:45 AM MDT	Mesoscale Discussion	SPC	Roosevelt, Sheridan	60 min
Jul 26, 1:07 PM MDT	Mesoscale Discussion	SPC	Daniels, Dawson, Fallon, Garfield, McCone, Petroleum and 7 more	53 min
Jul 26, 2:43 PM MDT	Severe Thunderstorm Watch	SPC	Daniels, Dawson, Garfield, McCone, Petroleum, Prairie and 5 more	5 hr

Nearby

Mesoscale Discussions in Montana, 2011 Every mesoscale discussion in 2011

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.