Alert archive / Wisconsin / Mesoscale Discussions in 2017

Mesoscale Discussion 1292

July 12, 201727 counties in Minnesota; 29 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 12, 2017, 1:49 AM CDT for 27 counties in Minnesota; 29 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 12, 2017, 1:49 AM CDT (06:49 UTC)
Expired
Jul 12, 2017, 4:00 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 410
All 56 counties

Anoka County, MN, Benton County, MN, Carver County, MN, Cass County, MN, Chisago County, MN, Crow Wing County, MN, Dakota County, MN, Goodhue County, MN, Hennepin County, MN, Isanti County, MN, Kanabec County, MN, Le Sueur County, MN, McLeod County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Nicollet County, MN, Pine County, MN, Ramsey County, MN, Rice County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Stearns County, MN, Wabasha County, MN, Washington County, MN, Wright County, MN, Adams County, WI, 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, Juneau County, WI, La Crosse County, WI, Lincoln County, WI, Marathon County, WI, Marquette County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Portage County, WI, Price County, WI, Rusk County, WI, Saint Croix County, WI, Sawyer County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Washburn County, WI, Waushara County, WI, Wood County, WI

The radar

The Minneapolis radar (KMPX), 98 km from the middle of the area, began a volume at 06:49 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, 6.8 hours before the alert went out and 100 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 2017-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 913 joules per kilogram.LCLLFCEL10008507005003002001001 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 2017-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 86 square meters per square second.193958Sfc1 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
913 J/kg
Mixed-layer CIN
-179 J/kg
Mixed-layer LCL
1279 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
86 m²/s²
0-3 km storm-relative helicity
202 m²/s²
Significant tornado parameter
0.1
Supercell composite
4.0

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
Jul 11, 7:09 PM CDTMesoscale DiscussionSPCClay, Norman, Polk2 hr
Jul 11, 10:00 PM CDTSevere Thunderstorm WatchSPCAnoka, Benton, Brown, Carver, Cass, Chippewa and 31 more6 hr
Jul 11, 9:49 PM CDTMesoscale DiscussionSPCCrawford, Dane, Grant, Green, Iowa, Lafayette and 5 more116 min
Jul 12, 3:56 AM CDTMesoscale DiscussionSPCChippewa, Clark, Eau Claire, Jackson, Langlade, Lincoln and 6 more3 hr
Jul 12, 2:53 PM CDTMesoscale DiscussionSPCAdams, Clark, Eau Claire, Forest, Jackson, Juneau and 16 more97 min
Jul 12, 3:33 PM CDTSevere Thunderstorm WatchSPCBrown, Calumet, Clark, Florence, Forest, Jackson and 18 more7 hr
Jul 12, 6:19 PM CDTMesoscale DiscussionSPCAdams, Crawford, Forest, Juneau, Langlade, Marathon and 11 more86 min

Nearby

Mesoscale Discussions in Wisconsin, 2017Mesoscale Discussions in Minnesota, 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.