Alert archive / North Dakota / Mesoscale Discussions in 2011

Mesoscale Discussion 1701

July 22, 201127 counties in North Dakota; 9 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 22, 2011, 7:56 PM MDT for 27 counties in North Dakota; 9 counties in South Dakota. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jul 22, 2011, 7:56 PM MDT (01:56 UTC)
Expired: Jul 22, 2011, 9:30 PM MDT
In force: 94 min
Issued by: the Storm Prediction Center

All 36 counties

Adams County, ND, Billings County, ND, Bowman County, ND, Burke County, ND, Burleigh County, ND, Divide County, ND, Dunn County, ND, Emmons County, ND, Golden Valley County, ND, Grant County, ND, Hettinger County, ND, Kidder County, ND, Logan County, ND, McIntosh County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Oliver County, ND, Renville County, ND, Sheridan County, ND, Sioux County, ND, Slope County, ND, Stark County, ND, Ward County, ND, Williams County, ND, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Harding County, SD, McPherson County, SD, Perkins County, SD, Walworth County, SD, Ziebach County, SD

The radar

The Bismarck radar (KBIS), 43 km from the middle of the area, began a volume at 01:56 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 675Jul 22, 9:10 PM MDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 1.9 hours before the alert went out and 44 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: 1986 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1048 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 219 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 7.2

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 22, 9:11 PM MDT	Mesoscale Discussion	SPC	Barnes, Benson, Cass, Eddy, Foster, Grand Forks and 15 more	64 min
Jul 22, 9:15 PM MDT	Severe Thunderstorm Watch	SPC	Barnes, Benson, Bottineau, Cass, Eddy, Foster and 12 more	7 hr
Jul 23, 12:25 AM MDT	Mesoscale Discussion	SPC	Barnes, Cass, Dickey, Eddy, Foster, Griggs and 9 more	35 min
Jul 23, 12:41 AM MDT	Severe Thunderstorm Watch	SPC	Ransom, Richland, Sargent	5 hr
Jul 23, 3:38 AM MDT	Mesoscale Discussion	SPC	Clark, Codington, Day, Deuel, Grant, Roberts and 1 more	67 min
Jul 23, 12:52 PM MDT	Mesoscale Discussion	SPC	Brookings, Deuel, Minnehaha, Moody	83 min

Nearby

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