Alert archive / Minnesota / Mesoscale Discussions in 2018

Mesoscale Discussion 1044

July 12, 201837 counties in Minnesota; Moody County, South Dakota; 8 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 12, 2018, 4:47 PM CDT for 37 counties in Minnesota; Moody County, South Dakota; 8 counties in Wisconsin. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued
Jul 12, 2018, 4:47 PM CDT (21:47 UTC)
Expired
Jul 12, 2018, 6:15 PM CDT
In force
88 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 46 counties

Anoka County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Cottonwood County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Jackson County, MN, Le Sueur County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, McLeod County, MN, Mower County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Olmsted County, MN, Pipestone County, MN, Ramsey County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Rock County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Winona County, MN, Wright County, MN, Moody County, SD, Buffalo County, WI, Chippewa County, WI, Dunn County, WI, Eau Claire County, WI, Pepin County, WI, Pierce County, WI, Saint Croix County, WI, Trempealeau County, WI

The radar

The Minneapolis radar (KMPX), 28 km from the middle of the area, began a volume at 21:49 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 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, 9.8 hours before the alert went out and 28 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 12:00Z on 2018-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 745 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 12:00Z on 2018-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 387 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
745 J/kg
Mixed-layer CIN
-244 J/kg
Mixed-layer LCL
1291 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
387 m²/s²
0-3 km storm-relative helicity
437 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.3

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, 8:58 PM CDTMesoscale DiscussionSPCAitkin, Becker, Beltrami, Cass, Clay, Clearwater and 12 more2 hr
Jul 11, 11:42 PM CDTMesoscale DiscussionSPCAitkin, Becker, Carlton, Cass, Crow Wing, Hubbard and 10 more2 hr
Jul 12, 12:57 AM CDTSevere Thunderstorm WatchSPCAitkin, Carlton, Cass, Crow Wing, Itasca, Lake and 2 more6 hr
Jul 12, 5:04 PM CDTSevere Thunderstorm WatchSPCAnoka, Blue Earth, Brown, Carver, Chisago, Cottonwood and 30 more7 hr
Jul 12, 2:47 PM CDTMesoscale DiscussionSPCBon Homme, Charles Mix, Clay, Douglas, Gregory, Hanson and 9 more2 hr
Jul 12, 3:24 PM CDTSevere Thunderstorm WatchSPCAurora, Bon Homme, Brookings, Brule, Charles Mix, Clay and 17 more7 hr
Jul 12, 6:36 PM CDTMesoscale DiscussionSPCBon Homme, Charles Mix, Clay, Davison, Douglas, Gregory and 9 more84 min

Nearby

Mesoscale Discussions in Minnesota, 2018Mesoscale Discussions in Wisconsin, 2018Mesoscale Discussions in South Dakota, 2018Every mesoscale discussion in 2018

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.