Alert archive / North Dakota / Mesoscale Discussions in 2008

Mesoscale Discussion 1949

July 28, 200811 counties in North Dakota; Corson County, Harding County, Perkins County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 28, 2008, 2:38 PM MDT for 11 counties in North Dakota; Corson County, Harding County, Perkins County, South Dakota. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Jul 28, 2008, 2:38 PM MDT (20:38 UTC)
Expired: Jul 28, 2008, 3:45 PM MDT
In force: 67 min
Issued by: the Storm Prediction Center

Counties Adams County, ND, Billings County, ND, Bowman County, ND, Dunn County, ND, Golden Valley County, ND, Grant County, ND, Hettinger County, ND, Morton County, ND, Sioux County, ND, Slope County, ND, Stark County, ND, Corson County, SD, Harding County, SD, Perkins County, SD

The radar

The Bismarck radar (KBIS), 152 km from the middle of the area, began a volume at 20:42 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.

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 8.6 hours before the alert went out and 241 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: 2193 J/kg
Mixed-layer CIN: -358 J/kg
Mixed-layer LCL: 1455 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 179 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 28, 2:02 AM MDT	Mesoscale Discussion	SPC	Billings, Golden Valley, McKenzie, Slope, Williams	88 min
Jul 28, 5:14 AM MDT	Severe Thunderstorm Watch	SPC	Billings, Burke, Burleigh, Divide, Dunn, Golden Valley and 13 more	8 hr
Jul 28, 6:50 AM MDT	Mesoscale Discussion	SPC	Billings, Burleigh, Dunn, Hettinger, Kidder, McHenry and 11 more	85 min
Jul 28, 11:17 AM MDT	Mesoscale Discussion	SPC	Burke, Burleigh, Dunn, Grant, McLean, Mercer and 6 more	58 min
Jul 28, 5:20 PM MDT	Tornado Watch	SPC	Buffalo, Campbell, Corson, Dewey, Haakon, Hughes and 7 more	4 hr

Nearby

Mesoscale Discussions in North Dakota, 2008 Mesoscale Discussions in South Dakota, 2008 Every mesoscale discussion in 2008

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.