Alert archive / North Dakota / Mesoscale Discussions in 2009

Mesoscale Discussion 1963

August 24, 200912 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 24, 2009, 1:27 AM CDT for 12 counties in North Dakota. It was in force for 33 min.

The area

The outline as issued.

The facts

Issued: Aug 24, 2009, 1:27 AM CDT (06:27 UTC)
Expired: Aug 24, 2009, 2:00 AM CDT
In force: 33 min
Issued by: the Storm Prediction Center

Counties Bottineau County, ND, Burke County, ND, Divide County, ND, McHenry County, ND, McKenzie County, ND, McLean County, ND, Mountrail County, ND, Pierce County, ND, Renville County, ND, Rolette County, ND, Ward County, ND, Williams County, ND

The watches that followed

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

Severe Thunderstorm Watch 734Aug 24, 1:45 AM CDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 6.5 hours before the alert went out and 204 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: 941 J/kg
Mixed-layer CIN: -310 J/kg
Mixed-layer LCL: 1679 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 125 m²/s²
0-3 km storm-relative helicity: 185 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

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, 8:02 PM CDT	Mesoscale Discussion	SPC	Billings, Bowman, Burke, Divide, Dunn, Golden Valley and 10 more	88 min
Aug 23, 8:55 PM CDT	Tornado Watch	SPC	Adams, Billings, Bowman, Burke, Divide, Dunn and 15 more	5 hr
Aug 23, 11:12 PM CDT	Mesoscale Discussion	SPC	Burke, Divide, McKenzie, Mountrail, Renville, Ward and 1 more	93 min
Aug 24, 1:48 AM CDT	Severe Thunderstorm Watch	SPC	Bottineau, Burke, Dunn, McHenry, McLean, Mercer and 6 more	4 hr
Aug 24, 4:32 AM CDT	Mesoscale Discussion	SPC	Bottineau, McHenry, Pierce, Renville, Rolette	58 min

Nearby

Mesoscale Discussions in North 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.