Alert archive / North Dakota / Mesoscale Discussions in 2011

Mesoscale Discussion 1644

July 17, 2011Big Stone County, Traverse County, Minnesota; 5 counties in North Dakota; 5 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 17, 2011, 6:34 PM CDT for Big Stone County, Traverse County, Minnesota; 5 counties in North Dakota; 5 counties in South Dakota. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: Jul 17, 2011, 6:34 PM CDT (23:34 UTC)
Expired: Jul 17, 2011, 7:30 PM CDT
In force: 56 min
Issued by: the Storm Prediction Center

Counties Big Stone County, MN, Traverse County, MN, Dickey County, ND, LaMoure County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Brown County, SD, Day County, SD, Grant County, SD, Marshall County, SD, Roberts County, SD

The radar

The Aberdeen radar (KABR), 72 km from the middle of the area, began a volume at 23:35 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, 11.6 hours before the alert went out and 247 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: 4227 J/kg
Mixed-layer CIN: -184 J/kg
Mixed-layer LCL: 1037 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 276 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 37.4

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, 9:25 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Clay, Clearwater, Kittson, Lake of the Woods and 7 more	95 min
Jul 16, 11:37 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Clay, Clearwater, Hubbard, Kittson and 9 more	23 min
Jul 17, 9:15 AM CDT	Mesoscale Discussion	SPC	Becker, Clay, Clearwater, Kittson, Mahnomen, Marshall and 4 more	2 hr
Jul 17, 9:58 AM CDT	Severe Thunderstorm Watch	SPC	Becker, Beltrami, Clay, Clearwater, Hubbard, Kittson and 8 more	7 hr
Jul 17, 10:24 AM CDT	Mesoscale Discussion	SPC	Becker, Clay, Clearwater, Hubbard, Mahnomen, Norman and 5 more	66 min
Jul 17, 12:49 PM CDT	Tornado Watch	SPC	Becker, Clay, Clearwater, Hubbard, Mahnomen, Norman and 3 more	3 hr
Jul 17, 1:42 PM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Beltrami, Benton, Cass, Clay and 18 more	93 min
Jul 17, 3:37 PM CDT	Tornado Watch	SPC	Becker, Clay, Grant, Otter Tail, Wadena, Wilkin	6 hr
Jul 17, 4:34 PM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Benton, Carlton, Cass, Chippewa, Cook and 19 more	7 hr
Jul 17, 11:01 AM CDT	Mesoscale Discussion	SPC	Benson, Eddy, Foster, Grand Forks, Nelson, Ramsey	89 min

Nearby

Mesoscale Discussions in North Dakota, 2011 Mesoscale Discussions in South Dakota, 2011 Mesoscale Discussions in Minnesota, 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.