Alert archive / Iowa / Mesoscale Discussions in 2017

Mesoscale Discussion 722

May 15, 201711 counties in Illinois; 32 counties in Iowa; 10 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 15, 2017, 7:19 PM CDT for 11 counties in Illinois; 32 counties in Iowa; 10 counties in Wisconsin. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued
May 15, 2017, 7:19 PM CDT (00:19 UTC)
Expired
May 15, 2017, 8:15 PM CDT
In force
56 min
Issued by
the Storm Prediction Center
All 53 counties

Allamakee County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Emmet County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Humboldt County, IA, Jackson County, IA, Jones County, IA, Kossuth County, IA, Mitchell County, IA, Palo Alto County, IA, Pocahontas County, IA, Webster County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Boone County, IL, Carroll County, IL, DeKalb County, IL, Jo Daviess County, IL, Kane County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Stephenson County, IL, Whiteside County, IL, Winnebago County, IL, Crawford County, WI, Dane County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Lafayette County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 142 km from the middle of the area, began a volume at 00:19 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

Davenport, (KDVN), launched 00:00Z, 0.3 hours before the alert went out and 165 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, Davenport, at 00:00Z on 2017-05-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 865 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, Davenport, at 00:00Z on 2017-05-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 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
865 J/kg
Mixed-layer CIN
-169 J/kg
Mixed-layer LCL
1965 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
148 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.2

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
May 15, 7:52 PM CDTSevere Thunderstorm WatchSPCBoone, DeKalb, Jo Daviess, Kane, McHenry, Ogle and 2 more3 hr
May 15, 10:14 PM CDTMesoscale DiscussionSPCBoone, DeKalb, DuPage, Kane, Kendall, Lake and 2 more61 min
May 15, 8:50 PM CDTMesoscale DiscussionSPCClay, Dickinson, Emmet, Kossuth, Mitchell, Osceola and 3 more115 min
May 15, 9:48 PM CDTSevere Thunderstorm WatchSPCAllamakee, Howard, Mitchell, Winneshiek5 hr
May 15, 11:54 PM CDTSevere Thunderstorm WatchSPCCherokee, Clay, Dickinson, Lyon, O'Brien, Osceola and 3 more3 hr
May 16, 2:13 AM CDTMesoscale DiscussionSPCBuena Vista, Cherokee, Clay, Dickinson, Emmet, Hancock and 12 more92 min
May 16, 3:58 PM CDTMesoscale DiscussionSPCAdams, Audubon, Buena Vista, Calhoun, Carroll, Cass and 23 more2 hr
May 16, 4:57 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Buena Vista, Calhoun, Carroll and 23 more7 hr
May 16, 12:57 PM CDTMesoscale DiscussionSPCBuffalo, Clark, Eau Claire, Jackson, Marathon, Menominee and 7 more2 hr
May 16, 3:32 PM CDTMesoscale DiscussionSPCAdams, Barron, Buffalo, Burnett, Calumet, Chippewa and 33 more88 min
May 16, 4:02 PM CDTTornado WatchSPCAshland, Barron, Bayfield, Buffalo, Burnett, Chippewa and 24 more6 hr
May 16, 6:25 PM CDTMesoscale DiscussionSPCAshland, Barron, Bayfield, Brown, Buffalo, Burnett and 32 more65 min

Nearby

Mesoscale Discussions in Iowa, 2017Mesoscale Discussions in Illinois, 2017Mesoscale Discussions in Wisconsin, 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.