Alert archive / Iowa / Mesoscale Discussions in 2017

Mesoscale Discussion 1273

July 10, 201711 counties in Illinois; 32 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2017, 1:49 AM CDT for 11 counties in Illinois; 32 counties in Iowa. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued
Jul 10, 2017, 1:49 AM CDT (06:49 UTC)
Expired
Jul 10, 2017, 3:45 AM CDT
In force
116 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 43 counties

Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Davis County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Scott County, IA, Story County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Bureau County, IL, Carroll County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, Mercer County, IL, Rock Island County, IL, Stark County, IL, Warren County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 104 km from the middle of the area, began a volume at 06:53 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, 6.8 hours before the alert went out and 110 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 2017-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 475 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 2017-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 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
475 J/kg
Mixed-layer CIN
-89 J/kg
Mixed-layer LCL
1980 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
157 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Jul 10, 6:46 AM CDTMesoscale DiscussionSPCChampaign, Coles, DeWitt, Douglas, Edgar, Ford and 17 more119 min
Jul 10, 2:48 PM CDTMesoscale DiscussionSPCBureau, Ford, Grundy, Iroquois, Kankakee, LaSalle and 8 more117 min
Jul 10, 3:58 PM CDTSevere Thunderstorm WatchSPCBureau, Carroll, Champaign, Cook, DeKalb, DeWitt and 29 more7 hr
Jul 10, 6:18 PM CDTMesoscale DiscussionSPCBureau, Champaign, DeWitt, Ford, Fulton, Grundy and 21 more87 min
Jul 9, 9:10 PM CDTMesoscale DiscussionSPCAllamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 16 more65 min
Jul 9, 9:40 PM CDTSevere Thunderstorm WatchSPCAllamakee, Black Hawk, Bremer, Butler, Cerro Gordo, Chickasaw and 22 more5 hr
Jul 9, 11:45 PM CDTMesoscale DiscussionSPCAllamakee, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 23 more60 min
Jul 10, 2:43 AM CDTMesoscale DiscussionSPCButler, Franklin, Grundy, Hamilton, Hardin, Jasper and 7 more2 hr
Jul 10, 6:34 PM CDTMesoscale DiscussionSPCAppanoose, Davis, Decatur, Van Buren, Wayne86 min

Nearby

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