Alert archive / Minnesota / Mesoscale Discussions in 2017

Mesoscale Discussion 470

April 9, 201710 counties in Iowa; 17 counties in Minnesota; 14 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2017, 8:06 PM CDT for 10 counties in Iowa; 17 counties in Minnesota; 14 counties in Wisconsin. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued
Apr 9, 2017, 8:06 PM CDT (01:06 UTC)
Expired
Apr 9, 2017, 9:00 PM CDT
In force
54 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 41 counties

Cerro Gordo County, IA, Chickasaw County, IA, Floyd County, IA, Franklin County, IA, Hancock County, IA, Howard County, IA, Mitchell County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA, Dakota County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Le Sueur County, MN, Mower County, MN, Olmsted County, MN, Ramsey County, MN, Rice County, MN, Scott County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Washington County, MN, Winona County, MN, Barron County, WI, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, Pepin County, WI, Pierce County, WI, Price County, WI, Rusk County, WI, Saint Croix County, WI, Taylor County, WI, Trempealeau County, WI

The radar

The La Crosse radar (KARX), 86 km from the middle of the area, began a volume at 01:08 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 00:00Z, 1.1 hours before the alert went out and 142 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-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 2017-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2017-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 173 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
1596 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
173 m²/s²
0-3 km storm-relative helicity
450 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 9, 9:01 PM CDTSevere Thunderstorm WatchSPCButler, Cerro Gordo, Chickasaw, Floyd, Franklin, Hancock and 5 more4 hr
Apr 9, 10:28 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Clarke, Decatur, Lucas and 9 more2 hr
Apr 9, 11:28 PM CDTSevere Thunderstorm WatchSPCAppanoose, Clarke, Davis, Decatur, Lucas, Mahaska and 7 more4 hr
Apr 10, 1:53 AM CDTMesoscale DiscussionSPCAppanoose, Cedar, Clinton, Davis, Des Moines, Henry and 15 more2 hr
Apr 9, 11:32 PM CDTMesoscale DiscussionSPCDodge, Fillmore, Houston, Mower, Olmsted, Wabasha and 1 more58 min
Apr 10, 12:01 AM CDTSevere Thunderstorm WatchSPCFlorence, Forest, Langlade, Lincoln, Marathon, Oneida and 3 more3 hr
Apr 10, 2:16 AM CDTMesoscale DiscussionSPCAdams, Brown, Calumet, Columbia, Crawford, Dane and 26 more119 min
Apr 10, 11:57 AM CDTMesoscale DiscussionSPCKenosha, Milwaukee, Racine, Walworth3 hr
Apr 10, 1:48 PM CDTSevere Thunderstorm WatchSPCDane, Dodge, Green, Jefferson, Kenosha, Lafayette and 7 more8 hr
Apr 10, 3:25 PM CDTMesoscale DiscussionSPCJefferson, Kenosha, Milwaukee, Racine, Rock, Walworth and 1 more2 hr
Apr 10, 6:22 PM CDTMesoscale DiscussionSPCKenosha, Racine53 min

Nearby

Mesoscale Discussions in Minnesota, 2017Mesoscale Discussions in Wisconsin, 2017Mesoscale Discussions in Iowa, 2017Every mesoscale discussion in 2017

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.