Alert archive / Minnesota / Mesoscale Discussions in 2005

Mesoscale Discussion 2248

September 21, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Sep 21, 2005, 3:24 PM CDT for 4 states. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Sep 21, 2005, 3:24 PM CDT (20:24 UTC)
Expired: Sep 21, 2005, 5:00 PM CDT
In force: 96 min
Issued by: the Storm Prediction Center

All 57 counties

Lyon County, IA, Anoka County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Chisago County, MN, Cottonwood County, MN, Dakota County, MN, Goodhue County, MN, Hennepin County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, Lincoln County, MN, Lyon County, MN, McLeod County, MN, Meeker County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Pipestone County, MN, Ramsey County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Rock County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Washington County, MN, Watonwan County, MN, Wright County, MN, Yellow Medicine County, MN, Brookings County, SD, Deuel County, SD, Lincoln County, SD, Minnehaha County, SD, Moody County, SD, Barron County, WI, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Menominee County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Price County, WI, Rusk County, WI, Saint Croix County, WI, Shawano County, WI, Taylor County, WI

The radar

The Minneapolis radar (KMPX), 47 km from the middle of the area, began a volume at 20:29 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.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 8.4 hours before the alert went out and 49 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: 15 J/kg
Mixed-layer CIN: -441 J/kg
Mixed-layer LCL: 1544 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 60 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

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 21, 5:30 PM CDT	Severe Thunderstorm Watch	SPC	Dickinson, Emmet, Lyon, Osceola, Sioux	5 hr
Sep 21, 4:00 PM CDT	Severe Thunderstorm Watch	SPC	Anoka, Chisago, Dakota, Dodge, Goodhue, Hennepin and 10 more	6 hr

Nearby

Mesoscale Discussions in Minnesota, 2005 Mesoscale Discussions in Wisconsin, 2005 Mesoscale Discussions in South Dakota, 2005 Every mesoscale discussion in 2005

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.