Alert archive / South Dakota / Mesoscale Discussions in 2012

Mesoscale Discussion 1478

July 16, 2012Carter County, Fallon County, Montana; 7 counties in North Dakota; 9 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 16, 2012, 5:53 PM MDT for Carter County, Fallon County, Montana; 7 counties in North Dakota; 9 counties in South Dakota. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Jul 16, 2012, 5:53 PM MDT (23:53 UTC)
Expired: Jul 16, 2012, 7:00 PM MDT
In force: 67 min
Issued by: the Storm Prediction Center

Counties Carter County, MT, Fallon County, MT, Adams County, ND, Bowman County, ND, Emmons County, ND, Grant County, ND, Hettinger County, ND, Sioux County, ND, Slope County, ND, Butte County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Harding County, SD, Perkins County, SD, Potter County, SD, Walworth County, SD, Ziebach County, SD

The radar

The Bismarck radar (KBIS), 182 km from the middle of the area, began a volume at 23:55 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

Bismarck Municip, ND (KBIS), launched 12:00Z, 11.9 hours before the alert went out and 186 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: 890 J/kg
Mixed-layer CIN: -267 J/kg
Mixed-layer LCL: 1649 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -125 m²/s²
0-3 km storm-relative helicity: -101 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.7

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 16, 2:07 PM MDT	Mesoscale Discussion	SPC	Carter	113 min
Jul 16, 2:53 PM MDT	Severe Thunderstorm Watch	SPC	Carter	7 hr
Jul 15, 6:49 PM MDT	Mesoscale Discussion	SPC	Benson, Bottineau, Burke, Cavalier, Eddy, McHenry and 10 more	56 min
Jul 15, 9:54 PM MDT	Mesoscale Discussion	SPC	Benson, Bottineau, Burke, Cavalier, Eddy, McHenry and 10 more	66 min

Nearby

Mesoscale Discussions in South Dakota, 2012 Mesoscale Discussions in North Dakota, 2012 Mesoscale Discussions in Montana, 2012 Every mesoscale discussion in 2012

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.