Alert archive / North Dakota / Mesoscale Discussions in 2011

Mesoscale Discussion 1633

July 16, 201113 counties in North Dakota; 10 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 16, 2011, 3:53 PM CDT for 13 counties in North Dakota; 10 counties in South Dakota. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Jul 16, 2011, 3:53 PM CDT (20:53 UTC)
Expired: Jul 16, 2011, 5:30 PM CDT
In force: 97 min
Issued by: the Storm Prediction Center

All 23 counties

Burleigh County, ND, Dickey County, ND, Emmons County, ND, Grant County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Morton County, ND, Oliver County, ND, Sheridan County, ND, Sioux County, ND, Stutsman County, ND, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Hyde County, SD, McPherson County, SD, Potter County, SD, Sully County, SD, Walworth County, SD

The radar

The Bismarck radar (KBIS), 89 km from the middle of the area, began a volume at 20:54 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.

Tornado Watch 649Jul 16, 5:00 PM CDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 8.9 hours before the alert went out and 87 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: 894 J/kg
Mixed-layer CIN: -182 J/kg
Mixed-layer LCL: 764 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 261 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 13.2

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 16, 7:52 AM CDT	Mesoscale Discussion	SPC	Benson, Burleigh, Eddy, Foster, Griggs, Nelson and 4 more	113 min
Jul 16, 10:00 AM CDT	Mesoscale Discussion	SPC	Barnes, Cavalier, Eddy, Foster, Grand Forks, Griggs and 8 more	90 min
Jul 16, 4:57 PM CDT	Tornado Watch	SPC	Barnes, Benson, Burleigh, Cass, Cavalier, Dickey and 29 more	7 hr

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.