Alert archive / Iowa / Mesoscale Discussions in 2019

Mesoscale Discussion 646

May 16, 20194 states

The Storm Prediction Center issued this mesoscale discussion at May 16, 2019, 11:12 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 16, 2019, 11:12 PM CDT (04:12 UTC)
Expired
May 17, 2019, 1:15 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 65 counties

Adair County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Carroll County, IA, Cass County, IA, Cedar County, IA, Clinton County, IA, Crawford County, IA, Dallas County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Harrison County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monona County, IA, Muscatine County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Scott County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Warren County, IA, Washington County, IA, Bureau County, IL, Carroll County, IL, DeKalb County, IL, Ford County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, Mercer County, IL, Ogle County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Whiteside County, IL, Will County, IL, Benton County, IN, Burt County, NE, Cuming County, NE, Dodge County, NE, Washington County, NE

The radar

The Quad Cities radar (KDVN), 25 km from the middle of the area, began a volume at 04:13 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

Davenport, (KDVN), launched 00:00Z, 4.2 hours before the alert went out and 31 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 2019-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2335 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 2019-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 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
2335 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
1972 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
64 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
May 16, 7:14 PM CDTMesoscale DiscussionSPCBureau, Carroll, DeKalb, Ford, Grundy, Henry and 12 more2 hr
May 16, 7:57 PM CDTSevere Thunderstorm WatchSPCBureau, Carroll, Cook, DeKalb, DuPage, Ford and 18 more6 hr
May 16, 8:57 PM CDTMesoscale DiscussionSPCAdams, Allen, Blackford, DeKalb, Delaware, Jay and 3 more2 hr
May 17, 12:56 AM CDTMesoscale DiscussionSPCDearborn, Franklin, Ohio, Randolph, Union, Wayne3 hr
May 17, 2:17 PM CDTMesoscale DiscussionSPCBlackford, Dearborn, Decatur, Delaware, Fayette, Franklin and 12 more88 min
May 17, 3:43 PM CDTSevere Thunderstorm WatchSPCDearborn, Franklin, Ohio, Ripley, Switzerland6 hr
May 16, 8:06 PM CDTMesoscale DiscussionSPCAntelope, Arthur, Blaine, Boone, Brown, Buffalo and 28 more114 min
May 17, 1:14 PM CDTMesoscale DiscussionSPCBanner, Cheyenne, Kimball, Scotts Bluff2 hr
May 17, 1:54 PM CDTSevere Thunderstorm WatchSPCBanner, Cheyenne, Kimball, Morrill, Scotts Bluff6 hr
May 17, 1:55 PM CDTMesoscale DiscussionSPCArthur, Blaine, Chase, Custer, Dawson, Dundy and 13 more2 hr
May 17, 2:59 PM CDTTornado WatchSPCArthur, Blaine, Buffalo, Chase, Custer, Dawson and 27 more9 hr
May 17, 4:38 PM CDTSevere Thunderstorm WatchSPCBoyd, Brown, Cherry, Keya Paha, Sheridan7 hr
May 17, 5:07 PM CDTMesoscale DiscussionSPCBanner, Cheyenne, Kimball, Morrill, Scotts Bluff113 min
May 17, 5:45 PM CDTMesoscale DiscussionSPCArthur, Blaine, Buffalo, Chase, Custer, Dawson and 27 more2 hr

Nearby

Mesoscale Discussions in Iowa, 2019Mesoscale Discussions in Illinois, 2019Mesoscale Discussions in Nebraska, 2019Every mesoscale discussion in 2019

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.