Alert archive / North Dakota / Mesoscale Discussions in 2007

Mesoscale Discussion 917

May 29, 20075 counties in North Dakota; Campbell County, Walworth County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 29, 2007, 1:14 AM CDT for 5 counties in North Dakota; Campbell County, Walworth County, South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 29, 2007, 1:14 AM CDT (06:14 UTC)
Expired: May 29, 2007, 3:15 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Emmons County, ND, Kidder County, ND, Logan County, ND, McIntosh County, ND, Stutsman County, ND, Campbell County, SD, Walworth County, SD

The radar

The Bismarck radar (KBIS), 87 km from the middle of the area, began a volume at 06:15 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 00:00Z, 6.2 hours before the alert went out and 83 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: 151 J/kg
Mixed-layer CIN: -422 J/kg
Mixed-layer LCL: 1213 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 105 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
May 28, 7:40 PM CDT	Mesoscale Discussion	SPC	Burleigh, Dickey, Emmons, Foster, Grant, Kidder and 6 more	2 hr
May 28, 8:02 PM CDT	Mesoscale Discussion	SPC	Barnes, Cass, Grand Forks, Griggs, Nelson, Pembina and 3 more	88 min
May 28, 10:47 PM CDT	Mesoscale Discussion	SPC	Dickey, LaMoure, Logan, McIntosh, Stutsman	88 min

Nearby

Mesoscale Discussions in North Dakota, 2007 Mesoscale Discussions in South Dakota, 2007 Every mesoscale discussion in 2007

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.