Alert archive / Minnesota / Mesoscale Discussions in 2007

Mesoscale Discussion 339

March 25, 200716 counties in Iowa; 18 counties in Minnesota; 18 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Mar 25, 2007, 1:48 PM CDT for 16 counties in Iowa; 18 counties in Minnesota; 18 counties in Wisconsin. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Mar 25, 2007, 1:48 PM CDT (18:48 UTC)
Expired: Mar 25, 2007, 3:15 PM CDT
In force: 87 min
Issued by: the Storm Prediction Center

All 52 counties

Allamakee County, IA, Black Hawk County, IA, Bremer County, IA, Butler County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Hancock County, IA, Howard County, IA, Mitchell County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Anoka County, MN, Chisago County, MN, Dakota County, MN, Dodge County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Pine County, MN, Ramsey County, MN, Rice County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Washington County, MN, Winona County, MN, Barron County, WI, Buffalo County, WI, Burnett County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, La Crosse County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Rusk County, WI, Saint Croix County, WI, Sawyer County, WI, Taylor County, WI, Trempealeau County, WI, Washburn County, WI

The radar

The La Crosse radar (KARX), 107 km from the middle of the area, began a volume at 18:53 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 75Mar 25, 2:55 PM CDT

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 6.8 hours before the alert went out and 117 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: 33 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 645 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 232 m²/s²
0-3 km storm-relative helicity: 272 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
Mar 25, 2:54 PM CDT	Tornado Watch	SPC	Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 10 more	6 hr
Mar 25, 5:01 PM CDT	Mesoscale Discussion	SPC	Brown, Calumet, Florence, Fond du Lac, Forest, Green Lake and 15 more	59 min
Mar 25, 5:19 PM CDT	Tornado Watch	SPC	Brown, Calumet, Door, Florence, Forest, Kewaunee and 16 more	4 hr
Mar 25, 5:57 PM CDT	Mesoscale Discussion	SPC	Chippewa, Clark, Eau Claire, Jackson, Pepin, Taylor	63 min

Nearby

Mesoscale Discussions in Minnesota, 2007 Mesoscale Discussions in Wisconsin, 2007 Mesoscale Discussions in Iowa, 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.