Alert archive / North Dakota / Mesoscale Discussions in 2007

Mesoscale Discussion 833

May 18, 20079 counties in Minnesota; 35 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at May 18, 2007, 7:42 PM CDT for 9 counties in Minnesota; 35 counties in North Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 18, 2007, 7:42 PM CDT (00:42 UTC)
Expired: May 18, 2007, 9:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 44 counties

Clay County, MN, Kittson County, MN, Mahnomen County, MN, Marshall County, MN, Norman County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Roseau County, MN, Barnes County, ND, Benson County, ND, Bottineau County, ND, Burke County, ND, Burleigh County, ND, Cass County, ND, Cavalier County, ND, Divide County, ND, Dunn County, ND, Eddy County, ND, Foster County, ND, Grand Forks County, ND, Griggs County, ND, Kidder County, ND, McHenry County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Mountrail County, ND, Nelson County, ND, Oliver County, ND, Pembina County, ND, Pierce County, ND, Ramsey County, ND, Renville County, ND, Rolette County, ND, Sheridan County, ND, Steele County, ND, Stutsman County, ND, Towner County, ND, Traill County, ND, Walsh County, ND, Ward County, ND, Wells County, ND, Williams County, ND

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 0.7 hours before the alert went out and 131 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: 858 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 2820 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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 18, 10:02 PM CDT	Mesoscale Discussion	SPC	Becker, Clay, Grant, Kittson, Mahnomen, Marshall and 9 more	88 min

Nearby

Mesoscale Discussions in North Dakota, 2007 Mesoscale Discussions in Minnesota, 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.