Alert archive / North Dakota / Mesoscale Discussions in 2007

Mesoscale Discussion 1253

June 22, 20075 counties in Montana; 19 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 22, 2007, 2:25 PM MDT for 5 counties in Montana; 19 counties in North Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 22, 2007, 2:25 PM MDT (20:25 UTC)
Expired: Jun 22, 2007, 4:30 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 24 counties

Custer County, MT, Dawson County, MT, Fallon County, MT, Prairie County, MT, Wibaux County, MT, Billings County, ND, Bottineau County, ND, Bowman County, ND, Dunn County, ND, Golden Valley County, ND, Hettinger 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, Sheridan County, ND, Slope County, ND, Stark County, ND, Ward County, ND

The radar

The Bismarck radar (KBIS), 210 km from the middle of the area, began a volume at 20:28 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 watches that followed

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

Severe Thunderstorm Watch 445Jun 22, 3:35 PM MDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 8.4 hours before the alert went out and 214 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: 788 J/kg
Mixed-layer CIN: -132 J/kg
Mixed-layer LCL: 745 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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
Jun 22, 3:34 PM MDT	Severe Thunderstorm Watch	SPC	Dawson, Fallon, Prairie, Wibaux	6 hr

Nearby

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