Alert archive / North Dakota / Mesoscale Discussions in 2014

Mesoscale Discussion 1673

September 3, 20145 counties in Montana; 23 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 3, 2014, 7:54 PM MDT for 5 counties in Montana; 23 counties in North Dakota. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Sep 3, 2014, 7:54 PM MDT (01:54 UTC)
Expired: Sep 3, 2014, 9:30 PM MDT
In force: 96 min
Issued by: the Storm Prediction Center

All 28 counties

Dawson County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Wibaux County, MT, Billings County, ND, Bottineau County, ND, Burke County, ND, Burleigh County, ND, Divide County, ND, Dunn County, ND, Golden Valley County, ND, Kidder County, ND, McHenry County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Oliver County, ND, Pierce County, ND, Renville County, ND, Rolette County, ND, Sheridan County, ND, Stark County, ND, Ward County, ND, Wells County, ND, Williams County, ND

The radar

The Bismarck radar (KBIS), 158 km from the middle of the area, began a volume at 01:56 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, 1.9 hours before the alert went out and 162 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: 1433 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1425 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 155 m²/s²
0-3 km storm-relative helicity: 474 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 8.3

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 3, 6:01 PM MDT	Severe Thunderstorm Watch	SPC	Dawson, Richland, Roosevelt, Sheridan, Wibaux	7 hr
Sep 4, 12:17 AM MDT	Mesoscale Discussion	SPC	Barnes, Burleigh, Cass, Eddy, Foster, Griggs and 10 more	88 min
Sep 4, 12:48 AM MDT	Severe Thunderstorm Watch	SPC	Barnes, Burleigh, Cass, Foster, Griggs, Kidder and 8 more	5 hr
Sep 4, 3:43 AM MDT	Mesoscale Discussion	SPC	Barnes, Cass, Ransom, Richland	2 hr

Nearby

Mesoscale Discussions in North Dakota, 2014 Mesoscale Discussions in Montana, 2014 Every mesoscale discussion in 2014

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.