Alert archive / North Dakota / Mesoscale Discussions in 2011

Mesoscale Discussion 2089

September 1, 201120 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 1, 2011, 12:02 AM CDT for 20 counties in North Dakota. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Sep 1, 2011, 12:02 AM CDT (05:02 UTC)
Expired: Sep 1, 2011, 1:00 AM CDT
In force: 58 min
Issued by: the Storm Prediction Center

Counties Benson County, ND, Bottineau County, ND, Burleigh County, ND, Eddy County, ND, Foster County, ND, Griggs County, ND, Kidder County, ND, McHenry County, ND, McLean County, ND, Nelson County, ND, Pierce County, ND, Ramsey County, ND, Renville County, ND, Rolette County, ND, Sheridan County, ND, Steele County, ND, Towner County, ND, Walsh County, ND, Ward County, ND, Wells County, ND

The watches that followed

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

Severe Thunderstorm Watch 820Sep 1, 12:50 AM CDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 5.0 hours before the alert went out and 142 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: 1855 J/kg
Mixed-layer CIN: -213 J/kg
Mixed-layer LCL: 1413 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 306 m²/s²
0-3 km storm-relative helicity: 486 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.4

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
Aug 31, 8:24 PM CDT	Mesoscale Discussion	SPC	Billings, Bottineau, Burke, Divide, Dunn, Golden Valley and 10 more	66 min
Aug 31, 8:53 PM CDT	Severe Thunderstorm Watch	SPC	Billings, Bottineau, Burke, Burleigh, Divide, Dunn and 19 more	7 hr
Aug 31, 10:54 PM CDT	Mesoscale Discussion	SPC	Bottineau, Burke, Burleigh, Hettinger, McHenry, McLean and 9 more	96 min
Sep 1, 12:48 AM CDT	Severe Thunderstorm Watch	SPC	Benson, Cavalier, Eddy, Grand Forks, Griggs, Nelson and 6 more	6 hr
Sep 1, 3:40 AM CDT	Mesoscale Discussion	SPC	Benson, Cavalier, Eddy, Foster, Grand Forks, Griggs and 6 more	65 min

Nearby

Mesoscale Discussions in North 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.