Alert archive / North Dakota / Mesoscale Discussions in 2004

Mesoscale Discussion 2090

August 23, 200421 counties in North Dakota; 9 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 23, 2004, 5:02 PM MDT for 21 counties in North Dakota; 9 counties in South Dakota. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Aug 23, 2004, 5:02 PM MDT (23:02 UTC)
Expired: Aug 23, 2004, 6:30 PM MDT
In force: 88 min
Issued by: the Storm Prediction Center

All 30 counties

Adams County, ND, Billings County, ND, Burleigh County, ND, Dunn County, ND, Emmons County, ND, Golden Valley 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, 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, Faulk County, SD, Perkins County, SD, Potter County, SD, Walworth County, SD, Ziebach County, SD

The radar

The Bismarck radar (KBIS), 107 km from the middle of the area, began a volume at 23:02 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 778Aug 23, 7:35 PM MDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 11.0 hours before the alert went out and 111 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 890 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 169 m²/s²
0-3 km storm-relative helicity: 383 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
Aug 23, 12:59 PM MDT	Mesoscale Discussion	SPC	Billings, Bowman, Dunn, Golden Valley, McKenzie, Slope and 1 more	2 hr
Aug 23, 1:22 PM MDT	Mesoscale Discussion	SPC	Adams, Burleigh, Emmons, Grant, Hettinger, Kidder and 9 more	113 min
Aug 23, 2:25 PM MDT	Tornado Watch	SPC	Adams, Billings, Burleigh, Dunn, Emmons, Golden Valley and 15 more	6 hr
Aug 22, 6:32 PM MDT	Mesoscale Discussion	SPC	Bennett, Jackson, Mellette, Oglala Lakota, Pennington	118 min
Aug 23, 1:58 PM MDT	Mesoscale Discussion	SPC	Clay, Lincoln, McCook, Minnehaha, Turner, Union and 1 more	2 hr
Aug 23, 4:05 PM MDT	Severe Thunderstorm Watch	SPC	Bennett, Brule, Buffalo, Gregory, Haakon, Hand and 10 more	6 hr
Aug 23, 4:30 PM MDT	Mesoscale Discussion	SPC	Brookings, Clark, Codington, Day, Deuel, Grant and 6 more	2 hr

Nearby

Mesoscale Discussions in North Dakota, 2004 Mesoscale Discussions in South Dakota, 2004 Every mesoscale discussion in 2004

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.