Alert archive / Minnesota / Mesoscale Discussions in 2004

Mesoscale Discussion 363

April 18, 200421 counties in Minnesota; Roberts County, South Dakota; 13 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2004, 4:43 AM CDT for 21 counties in Minnesota; Roberts County, South Dakota; 13 counties in Wisconsin. It was in force for 32 min.

The area

The outline as issued.

The facts

Issued: Apr 18, 2004, 4:43 AM CDT (09:43 UTC)
Expired: Apr 18, 2004, 5:15 AM CDT
In force: 32 min
Issued by: the Storm Prediction Center

All 35 counties

Aitkin County, MN, Benton County, MN, Carlton County, MN, Cass County, MN, Chisago County, MN, Crow Wing County, MN, Douglas County, MN, Grant County, MN, Isanti County, MN, Kanabec County, MN, Mille Lacs County, MN, Morrison County, MN, Otter Tail County, MN, Pine County, MN, Pope County, MN, Sherburne County, MN, Stearns County, MN, Stevens County, MN, Todd County, MN, Traverse County, MN, Wadena County, MN, Roberts County, SD, Ashland County, WI, Barron County, WI, Bayfield County, WI, Burnett County, WI, Douglas County, WI, Iron County, WI, Lincoln County, WI, Polk County, WI, Price County, WI, Rusk County, WI, Sawyer County, WI, Taylor County, WI, Washburn County, WI

The radar

The Minneapolis radar (KMPX), 120 km from the middle of the area, began a volume at 09:42 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

Minneapolis, MN (KMPX), launched 00:00Z, 9.7 hours before the alert went out and 120 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2026 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 489 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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
Apr 17, 7:45 PM CDT	Severe Thunderstorm Watch	SPC	Blue Earth, Dodge, Faribault, Fillmore, Freeborn, Houston and 7 more	5 hr
Apr 17, 9:31 PM CDT	Mesoscale Discussion	SPC	Blue Earth, Dodge, Faribault, Fillmore, Freeborn, Houston and 7 more	119 min
Apr 17, 10:05 PM CDT	Tornado Watch	SPC	Blue Earth, Dodge, Faribault, Fillmore, Freeborn, Houston and 7 more	5 hr
Apr 17, 11:10 PM CDT	Mesoscale Discussion	SPC	Big Stone, Chippewa, Cottonwood, Grant, Jackson, Kandiyohi and 14 more	95 min
Apr 17, 11:35 PM CDT	Severe Thunderstorm Watch	SPC	Big Stone, Brown, Chippewa, Cottonwood, Jackson, Kandiyohi and 16 more	5 hr
Apr 17, 11:50 PM CDT	Mesoscale Discussion	SPC	Blue Earth, Dodge, Faribault, Fillmore, Freeborn, Houston and 7 more	85 min
Apr 18, 12:30 AM CDT	Severe Thunderstorm Watch	SPC	Anoka, Carver, Chisago, Dakota, Goodhue, Hennepin and 11 more	5 hr
Apr 18, 2:37 AM CDT	Mesoscale Discussion	SPC	Aitkin, Anoka, Benton, Big Stone, Brown, Carlton and 40 more	53 min
Apr 18, 8:04 AM CDT	Mesoscale Discussion	SPC	Aitkin, Benton, Carlton, Cass, Crow Wing, Douglas and 6 more	86 min
Apr 18, 12:39 PM CDT	Mesoscale Discussion	SPC	Aitkin, Anoka, Benton, Big Stone, Carlton, Carver and 32 more	2 hr
Apr 18, 1:40 PM CDT	Tornado Watch	SPC	Aitkin, Anoka, Benton, Carlton, Carver, Chippewa and 32 more	6 hr
Apr 18, 2:20 PM CDT	Severe Thunderstorm Watch	SPC	Lincoln, Lyon, Pipestone, Rock	6 hr
Apr 18, 3:33 PM CDT	Mesoscale Discussion	SPC	Aitkin, Anoka, Benton, Carlton, Chisago, Crow Wing and 12 more	117 min
Apr 18, 4:15 PM CDT	Mesoscale Discussion	SPC	Blue Earth, Brown, Cottonwood, Dodge, Faribault, Fillmore and 15 more	60 min
Apr 18, 4:40 PM CDT	Tornado Watch	SPC	Blue Earth, Cottonwood, Dodge, Faribault, Freeborn, Jackson and 6 more	5 hr
Apr 18, 5:23 PM CDT	Mesoscale Discussion	SPC	Lincoln, Lyon, Pipestone, Rock	2 hr
Apr 18, 6:35 PM CDT	Tornado Watch	SPC	Brown, Carver, Dakota, Goodhue, Hennepin, Le Sueur and 7 more	5 hr
Apr 18, 1:42 PM CDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bennett, Brule, Buffalo, Charles Mix and 20 more	3 hr
Apr 18, 1:49 AM CDT	Mesoscale Discussion	SPC	Calumet, Columbia, Dane, Dodge, Fond du Lac, Green and 11 more	56 min

Nearby

Mesoscale Discussions in Minnesota, 2004 Mesoscale Discussions in Wisconsin, 2004 Mesoscale Discussions in South Dakota, 2004 Every mesoscale discussion in 2004

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.