Alert archive / Montana / Mesoscale Discussions in 2005

Mesoscale Discussion 1741

July 13, 200510 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2005, 12:37 PM MDT for 10 counties in Montana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 13, 2005, 12:37 PM MDT (18:37 UTC)
Expired: Jul 13, 2005, 3:00 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Daniels County, MT, Dawson County, MT, Garfield County, MT, McCone County, MT, Petroleum County, MT, Phillips County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Valley County, MT

The radar

The Glasgow radar (KGGW), 44 km from the middle of the area, began a volume at 18:40 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 636Jul 13, 2:30 PM MDT

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 6.6 hours before the alert went out and 265 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2565 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: -67 m²/s²
0-3 km storm-relative helicity: 143 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, 1:40 PM MDT	Mesoscale Discussion	SPC	Beaverhead, Broadwater, Cascade, Deer Lodge, Fergus, Gallatin and 10 more	3 hr
Jul 13, 2:30 PM MDT	Severe Thunderstorm Watch	SPC	Carbon, Daniels, Fergus, Gallatin, Garfield, Golden Valley and 12 more	9 hr
Jul 13, 5:21 PM MDT	Mesoscale Discussion	SPC	Carbon, Fergus, Gallatin, Garfield, Golden Valley, Judith Basin and 10 more	84 min

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.