Alert archive / Wisconsin / Mesoscale Discussions in 2015

Mesoscale Discussion 1459

July 18, 20154 counties in Iowa; 7 counties in Minnesota; 17 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2015, 2:05 AM CDT for 4 counties in Iowa; 7 counties in Minnesota; 17 counties in Wisconsin. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
Jul 18, 2015, 2:05 AM CDT (07:05 UTC)
Expired
Jul 18, 2015, 3:30 AM CDT
In force
85 min
Issued by
the Storm Prediction Center
All 28 counties

Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Worth County, IA, Dodge County, MN, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Adams County, WI, Buffalo 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, Marathon County, WI, Monroe County, WI, Pepin County, WI, Portage County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 62 km from the middle of the area, began a volume at 07:05 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, 7.1 hours before the alert went out and 169 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 2015-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 888 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 2015-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 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
888 J/kg
Mixed-layer CIN
-162 J/kg
Mixed-layer LCL
1752 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
104 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

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 17, 8:55 PM CDTSevere Thunderstorm WatchSPCBuena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more5 hr
Jul 17, 8:57 PM CDTMesoscale DiscussionSPCAudubon, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 15 more3 hr
Jul 17, 11:26 PM CDTMesoscale DiscussionSPCBuena Vista, Cherokee, Clay, Dickinson, Emmet, Ida and 12 more2 hr
Jul 18, 3:06 AM CDTMesoscale DiscussionSPCAllamakee, Winneshiek84 min
Jul 18, 12:31 PM CDTMesoscale DiscussionSPCAllamakee, Benton, Black Hawk, Buchanan, Cedar, Clayton and 21 more119 min
Jul 18, 1:31 PM CDTTornado WatchSPCClinton, Dubuque, Jackson, Scott5 hr
Jul 17, 7:18 PM CDTMesoscale DiscussionSPCBenton, Brown, Carver, Chippewa, Cottonwood, Douglas and 29 more117 min
Jul 17, 8:39 PM CDTSevere Thunderstorm WatchSPCAnoka, Blue Earth, Brown, Carver, Chippewa, Dakota and 27 more5 hr
Jul 17, 9:55 PM CDTMesoscale DiscussionSPCBig Stone, Grant, Traverse65 min
Jul 18, 12:23 AM CDTMesoscale DiscussionSPCAnoka, Dakota, Dodge, Goodhue, Hennepin, Houston and 7 more67 min
Jul 18, 12:41 AM CDTSevere Thunderstorm WatchSPCDodge, Fillmore, Houston, Mower, Olmsted, Wabasha and 1 more5 hr
Jul 18, 3:56 AM CDTSevere Thunderstorm WatchSPCBrown, Calumet, Columbia, Dane, Dodge, Fond du Lac and 16 more4 hr
Jul 18, 5:24 AM CDTMesoscale DiscussionSPCBrown, Calumet, Dodge, Fond du Lac, Manitowoc, Outagamie and 5 more96 min

Nearby

Mesoscale Discussions in Wisconsin, 2015Mesoscale Discussions in Minnesota, 2015Mesoscale Discussions in Iowa, 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.