Alert archive / North Dakota / Mesoscale Discussions in 2009

Mesoscale Discussion 1998

September 8, 200912 counties in North Dakota; Corson County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 8, 2009, 12:44 AM MDT for 12 counties in North Dakota; Corson County, South Dakota. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Sep 8, 2009, 12:44 AM MDT (06:44 UTC)
Expired: Sep 8, 2009, 2:15 AM MDT
In force: 91 min
Issued by: the Storm Prediction Center

Counties Adams County, ND, Dunn County, ND, Grant County, ND, Hettinger County, ND, McHenry County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Oliver County, ND, Sioux County, ND, Stark County, ND, Ward County, ND, Corson County, SD

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 6.7 hours before the alert went out and 117 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: 1321 J/kg
Mixed-layer CIN: -99 J/kg
Mixed-layer LCL: 1460 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 73 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
Sep 8, 1:32 PM MDT	Mesoscale Discussion	SPC	Beadle, Bennett, Brown, Brule, Buffalo, Edmunds and 14 more	88 min
Sep 8, 1:53 PM MDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Brown, Brule, Buffalo, Charles Mix and 26 more	8 hr

Nearby

Mesoscale Discussions in North Dakota, 2009 Mesoscale Discussions in South 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.