Alert archive / Wisconsin / Mesoscale Discussions in 2015

Mesoscale Discussion 1391

July 13, 20158 counties in Minnesota; 27 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2015, 1:51 PM CDT for 8 counties in Minnesota; 27 counties in Wisconsin. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Jul 13, 2015, 1:51 PM CDT (18:51 UTC)
Expired
Jul 13, 2015, 3:15 PM CDT
In force
84 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 35 counties

Anoka County, MN, Chisago County, MN, Dakota County, MN, Goodhue County, MN, Ramsey County, MN, Wabasha County, MN, Washington County, MN, Winona County, MN, Adams County, WI, Barron County, WI, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Columbia County, WI, Dane County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Marquette County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Portage County, WI, Richland County, WI, Rusk County, WI, Saint Croix County, WI, Sauk County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Waushara County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 57 km from the middle of the area, began a volume at 18:52 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, 6.9 hours before the alert went out and 205 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 2015-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1389 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 2015-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 230 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
1389 J/kg
Mixed-layer CIN
-176 J/kg
Mixed-layer LCL
836 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
230 m²/s²
0-3 km storm-relative helicity
247 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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 DiscussionSPCAnoka, Benton, Blue Earth, Brown, Carver, Chippewa and 45 more114 min
Jul 12, 8:16 PM CDTMesoscale DiscussionSPCBecker, Beltrami, Clay, Clearwater, Douglas, Grant and 13 more59 min
Jul 12, 9:03 PM CDTMesoscale DiscussionSPCFillmore, Houston, Winona117 min
Jul 12, 9:41 PM CDTMesoscale DiscussionSPCAnoka, Benton, Blue Earth, Brown, Carver, Chisago and 32 more94 min
Jul 12, 9:59 PM CDTSevere Thunderstorm WatchSPCAnoka, Blue Earth, Carver, Chisago, Dakota, Dodge and 26 more6 hr
Jul 12, 11:55 PM CDTMesoscale DiscussionSPCAnoka, Benton, Blue Earth, Brown, Carver, Chisago and 30 more95 min
Jul 13, 2:00 AM CDTMesoscale DiscussionSPCHouston2 hr
Jul 13, 3:11 PM CDTSevere Thunderstorm WatchSPCDodge, Fillmore, Goodhue, Houston, Olmsted, Wabasha and 1 more6 hr
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
Jul 13, 3:21 PM CDTMesoscale DiscussionSPCGreen, Lafayette, Rock, Walworth84 min

Nearby

Mesoscale Discussions in Wisconsin, 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.