Alert archive / Minnesota / Mesoscale Discussions in 2007

Mesoscale Discussion 1906

August 27, 200714 counties in Minnesota; Cass County, Richland County, North Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2007, 5:34 PM CDT for 14 counties in Minnesota; Cass County, Richland County, North Dakota. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Aug 27, 2007, 5:34 PM CDT (22:34 UTC)
Expired: Aug 27, 2007, 7:30 PM CDT
In force: 116 min
Issued by: the Storm Prediction Center

Counties Aitkin County, MN, Becker County, MN, Carlton County, MN, Cass County, MN, Clay County, MN, Clearwater County, MN, Crow Wing County, MN, Hubbard County, MN, Itasca County, MN, Mahnomen County, MN, Otter Tail County, MN, Saint Louis County, MN, Wadena County, MN, Wilkin County, MN, Cass County, ND, Richland County, ND

The radar

The Duluth radar (KDLH), 181 km from the middle of the area, began a volume at 22:36 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 656Aug 27, 6:20 PM CDT

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.6 hours before the alert went out and 224 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: 79 J/kg
Mixed-layer CIN: -574 J/kg
Mixed-layer LCL: 668 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 152 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.6

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
Aug 26, 8:04 PM CDT	Mesoscale Discussion	SPC	Kittson, Marshall, Pennington, Polk, Red Lake, Roseau	116 min
Aug 26, 10:25 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Clay, Clearwater, Koochiching, Mahnomen and 4 more	65 min
Aug 27, 1:43 AM CDT	Mesoscale Discussion	SPC	Anoka, Chisago, Dakota, Dodge, Fillmore, Goodhue and 12 more	92 min
Aug 27, 7:10 AM CDT	Mesoscale Discussion	SPC	Wilkin	95 min
Aug 27, 10:14 AM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Clay, Clearwater, Hubbard, Itasca and 8 more	91 min
Aug 27, 12:55 PM CDT	Mesoscale Discussion	SPC	Becker, Clay, Mahnomen, Norman, Otter Tail, Wilkin	65 min
Aug 27, 2:29 PM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Becker, Beltrami, Cass, Clay, Clearwater and 15 more	8 hr
Aug 27, 6:19 PM CDT	Severe Thunderstorm Watch	SPC	Carlton, Cook, Lake, Pine, Saint Louis	7 hr
Aug 26, 11:07 PM CDT	Mesoscale Discussion	SPC	Adams, Burleigh, Emmons, Grant, Hettinger, Kidder and 2 more	113 min
Aug 27, 3:02 AM CDT	Mesoscale Discussion	SPC	Dickey, Emmons, LaMoure, Logan, McIntosh, Ransom and 2 more	88 min
Aug 27, 3:14 AM CDT	Severe Thunderstorm Watch	SPC	Barnes, Burleigh, Cass, Dickey, Emmons, Griggs and 10 more	7 hr

Nearby

Mesoscale Discussions in Minnesota, 2007 Mesoscale Discussions in North 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.