Alert archive / Iowa / Mesoscale Discussions in 2017

Mesoscale Discussion 1174

June 28, 20174 states

The Storm Prediction Center issued this mesoscale discussion at Jun 28, 2017, 5:29 PM CDT for 4 states. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
Jun 28, 2017, 5:29 PM CDT (22:29 UTC)
Expired
Jun 28, 2017, 7:00 PM CDT
In force
91 min
Issued by
the Storm Prediction Center
All 71 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cass County, IA, Cedar County, IA, Clarke County, IA, Clayton County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Franklin County, IA, Fremont County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Webster County, IA, Wright County, IA, Adair County, MO, Atchison County, MO, Gentry County, MO, Harrison County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Sullivan County, MO, Worth County, MO, Nemaha County, NE, Grant County, WI, Lafayette County, WI

The radar

The Des Moines radar (KDMX), 51 km from the middle of the area, began a volume at 22:30 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 nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.5 hours before the alert went out and 213 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, Omaha, NE at 12:00Z on 2017-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 742 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, Omaha, NE at 12:00Z on 2017-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 721 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
742 J/kg
Mixed-layer CIN
-297 J/kg
Mixed-layer LCL
831 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
721 m²/s²
0-3 km storm-relative helicity
852 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.8

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
Jun 27, 7:35 PM CDTSevere Thunderstorm WatchSPCCherokee, Lyon, O'Brien, Osceola, Plymouth, Sioux and 1 more5 hr
Jun 27, 11:33 PM CDTMesoscale DiscussionSPCCrawford, Fremont, Harrison, Mills, Monona, Pottawattamie and 1 more57 min
Jun 28, 2:14 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Benton, Black Hawk and 51 more2 hr
Jun 28, 2:53 PM CDTTornado WatchSPCAdair, Adams, Appanoose, Audubon, Benton, Black Hawk and 66 more9 hr
Jun 27, 8:12 PM CDTMesoscale DiscussionSPCAntelope, Blaine, Boone, Boyd, Brown, Buffalo and 27 more93 min
Jun 27, 8:56 PM CDTSevere Thunderstorm WatchSPCAdams, Antelope, Boone, Boyd, Buffalo, Butler and 37 more5 hr
Jun 28, 4:07 PM CDTMesoscale DiscussionSPCBanner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more113 min
Jun 28, 5:46 PM CDTMesoscale DiscussionSPCGage, Jefferson, Johnson, Pawnee, Richardson, Thayer89 min
Jun 28, 2:49 PM CDTMesoscale DiscussionSPCBarron, Buffalo, Chippewa, Clark, Dunn, Eau Claire and 13 more116 min
Jun 28, 4:09 PM CDTTornado WatchSPCBarron, Buffalo, Burnett, Chippewa, Clark, Dunn and 15 more6 hr
Jun 28, 5:00 PM CDTMesoscale DiscussionSPCColumbia, Dane, Dodge, Green, Iowa, Jefferson and 3 more30 min
Jun 28, 5:14 PM CDTTornado WatchSPCColumbia, Dane, Dodge, Green, Iowa, Jefferson and 10 more4 hr

Nearby

Mesoscale Discussions in Iowa, 2017Mesoscale Discussions in Missouri, 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.