Alert archive / Wisconsin / Mesoscale Discussions in 2015

Mesoscale Discussion 1384

July 12, 20154 counties in Iowa; Fillmore County, Houston County, Winona County, Minnesota; 20 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 12, 2015, 9:03 PM CDT for 4 counties in Iowa; Fillmore County, Houston County, Winona County, Minnesota; 20 counties in Wisconsin. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
Jul 12, 2015, 9:03 PM CDT (02:03 UTC)
Expired
Jul 12, 2015, 11:00 PM CDT
In force
117 min
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 27 counties

Allamakee County, IA, Chickasaw County, IA, Howard County, IA, Winneshiek County, IA, Fillmore County, MN, Houston County, MN, Winona County, MN, Ashland County, WI, Bayfield County, WI, Chippewa County, WI, Clark County, WI, Crawford County, WI, Douglas County, WI, Eau Claire County, WI, Iron County, WI, Jackson County, WI, La Crosse County, WI, Monroe County, WI, Price County, WI, Richland County, WI, Rusk County, WI, Sawyer County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Washburn County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 111 km from the middle of the area, began a volume at 02:04 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, 2.1 hours before the alert went out and 176 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 2015-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3598 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 2015-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 124 square meters per square second.19395878Sfc1 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
3598 J/kg
Mixed-layer CIN
-75 J/kg
Mixed-layer LCL
1040 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
124 m²/s²
0-3 km storm-relative helicity
116 m²/s²
Significant tornado parameter
1.4
Supercell composite
12.7

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.

IssuedProductOfficeCountiesLasted
Jul 12, 7:51 PM CDTMesoscale DiscussionSPCDickinson, Emmet, Kossuth, Winnebago114 min
Jul 12, 9:41 PM CDTMesoscale DiscussionSPCBremer, Butler, Cerro Gordo, Chickasaw, Floyd, Hancock and 4 more94 min
Jul 12, 9:59 PM CDTSevere Thunderstorm WatchSPCAllamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 7 more6 hr
Jul 12, 11:55 PM CDTMesoscale DiscussionSPCAllamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 7 more95 min
Jul 13, 2:00 AM CDTMesoscale DiscussionSPCAllamakee, Clayton, Fayette, Winneshiek2 hr
Jul 13, 3:11 PM CDTSevere Thunderstorm WatchSPCAllamakee6 hr
Jul 13, 3:21 PM CDTMesoscale DiscussionSPCClinton84 min
Jul 13, 4:01 PM CDTTornado WatchSPCCedar, Clinton, Des Moines, Dubuque, Jackson, Jones and 3 more7 hr
Jul 13, 6:59 PM CDTMesoscale DiscussionSPCCedar, Clinton, Des Moines, Dubuque, Jackson, Jones and 4 more91 min
Jul 12, 8:16 PM CDTMesoscale DiscussionSPCBecker, Beltrami, Clay, Clearwater, Douglas, Grant and 13 more59 min
Jul 13, 1:51 PM CDTMesoscale DiscussionSPCAnoka, Chisago, Dakota, Goodhue, Ramsey, Wabasha and 2 more84 min
Jul 13, 6:09 PM CDTMesoscale DiscussionSPCHouston, Wabasha, Winona66 min
Jul 13, 3:49 AM CDTMesoscale DiscussionSPCKenosha, Rock, Walworth116 min
Jul 13, 4:14 AM CDTSevere Thunderstorm WatchSPCGreen, Jefferson, Kenosha, Lafayette, Milwaukee, Ozaukee and 5 more6 hr

Nearby

Mesoscale Discussions in Wisconsin, 2015Mesoscale Discussions in Iowa, 2015Mesoscale Discussions in Minnesota, 2015Every mesoscale discussion in 2015

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.