Alert archive / North Dakota / Mesoscale Discussions in 2009

Mesoscale Discussion 79

February 9, 200917 counties in North Dakota; Perkins County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Feb 9, 2009, 4:52 PM MST for 17 counties in North Dakota; Perkins County, South Dakota. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Feb 9, 2009, 4:52 PM MST (23:52 UTC)
Expired: Feb 9, 2009, 8:45 PM MST
In force: 4 hr
Issued by: the Storm Prediction Center

Counties Adams County, ND, Billings County, ND, Burke County, ND, Dunn County, ND, Grant County, ND, Hettinger County, ND, McHenry County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Oliver County, ND, Renville County, ND, Slope County, ND, Stark County, ND, Ward County, ND, Perkins County, SD

The radar

The Bismarck radar (KBIS), 87 km from the middle of the area, began a volume at 23:53 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 91 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: 3 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 468 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 215 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Feb 8, 11:12 PM MST	Mesoscale Discussion	SPC	Bottineau, Burke, Cavalier, Grand Forks, McHenry, Mountrail and 8 more	3 hr

Nearby

Mesoscale Discussions in North Dakota, 2009 Mesoscale Discussions in South Dakota, 2009 Every mesoscale discussion in 2009

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.