Alert archive / Minnesota / Mesoscale Discussions in 2003

Mesoscale Discussion 2257

August 25, 2003Gogebic County, Michigan; Itasca County, Lake County, Saint Louis County, Minnesota; Ashland County, Bayfield County, Iron County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 25, 2003, 10:02 PM CDT for Gogebic County, Michigan; Itasca County, Lake County, Saint Louis County, Minnesota; Ashland County, Bayfield County, Iron County, Wisconsin. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Aug 25, 2003, 10:02 PM CDT (03:02 UTC)
Expired: Aug 25, 2003, 11:00 PM CDT
In force: 58 min
Issued by: the Storm Prediction Center

Counties Gogebic County, MI, Itasca County, MN, Lake County, MN, Saint Louis County, MN, Ashland County, WI, Bayfield County, WI, Iron County, WI

The radar

The Duluth radar (KDLH), 69 km from the middle of the area, began a volume at 03:03 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.

Tornado Watch 889Aug 25, 11:10 PM CDT

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 3.0 hours before the alert went out and 143 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: 1016 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 1579 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 171 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 7.3

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
Aug 25, 11:27 PM CDT	Mesoscale Discussion	SPC	Monroe, Wayne	63 min
Aug 26, 1:35 AM CDT	Mesoscale Discussion	SPC	Clare, Gladwin, Isabella, Lake, Mecosta, Midland and 3 more	85 min
Aug 26, 2:49 AM CDT	Mesoscale Discussion	SPC	Allegan, Barry, Branch, Calhoun, Cass, Clinton and 12 more	116 min
Aug 26, 4:41 AM CDT	Mesoscale Discussion	SPC	Antrim, Cheboygan, Crawford, Emmet, Montmorency, Oscoda and 1 more	94 min
Aug 26, 5:00 AM CDT	Severe Thunderstorm Watch	SPC	Alpena, Antrim, Charlevoix, Cheboygan, Crawford, Emmet and 7 more	4 hr
Aug 26, 6:47 AM CDT	Mesoscale Discussion	SPC	Alpena, Crawford, Montmorency, Oscoda, Presque Isle	58 min
Aug 26, 8:10 AM CDT	Severe Thunderstorm Watch	SPC	Monroe	5 hr
Aug 26, 1:15 PM CDT	Severe Thunderstorm Watch	SPC	Berrien, Branch, Cass, Saint Joseph	4 hr
Aug 25, 7:04 PM CDT	Mesoscale Discussion	SPC	Beltrami, Clearwater, Itasca, Kittson, Koochiching, Marshall and 4 more	56 min
Aug 25, 7:38 PM CDT	Mesoscale Discussion	SPC	Fillmore, Houston, Mower	67 min
Aug 25, 8:05 PM CDT	Tornado Watch	SPC	Itasca, Koochiching, Saint Louis	6 hr
Aug 25, 11:10 PM CDT	Tornado Watch	SPC	Aitkin, Carlton, Kanabec, Mille Lacs, Pine	6 hr
Aug 26, 12:21 AM CDT	Mesoscale Discussion	SPC	Dane, Green, Iowa, Jefferson, Lafayette, Rock and 2 more	84 min

Nearby

Mesoscale Discussions in Minnesota, 2003 Mesoscale Discussions in Wisconsin, 2003 Mesoscale Discussions in Michigan, 2003 Every mesoscale discussion in 2003

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.