Alert archive / Illinois / Mesoscale Discussions in 2014

Mesoscale Discussion 1033

June 17, 201425 counties in Illinois; Clinton County, Jackson County, Scott County, Iowa; 4 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jun 17, 2014, 3:41 AM CDT for 25 counties in Illinois; Clinton County, Jackson County, Scott County, Iowa; 4 counties in Wisconsin. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
Jun 17, 2014, 3:41 AM CDT (08:41 UTC)
Expired
Jun 17, 2014, 4:45 AM CDT
In force
64 min
Issued by
the Storm Prediction Center
All 32 counties

Clinton County, IA, Jackson County, IA, Scott County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Henry County, IL, Jo Daviess County, IL, Kane County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Marshall County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Green County, WI, Kenosha County, WI, Rock County, WI, Walworth County, WI

The radar

The Quad Cities radar (KDVN), 104 km from the middle of the area, began a volume at 08:41 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, 8.7 hours before the alert went out and 97 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 2014-06-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2074 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 2014-06-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 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
2074 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
1135 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
122 m²/s²
Significant tornado parameter
0.8
Supercell composite
5.2

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
Jun 16, 9:01 PM CDTSevere Thunderstorm WatchSPCBureau, Carroll, Henderson, Henry, Jo Daviess, Mercer and 5 more8 hr
Jun 16, 9:24 PM CDTSevere Thunderstorm WatchSPCBoone, DeKalb, Kane, LaSalle, Lee, McHenry and 2 more6 hr
Jun 16, 11:40 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, Grundy, Henry and 12 more65 min
Jun 17, 1:29 AM CDTMesoscale DiscussionSPCBoone, Bureau, DeKalb, Henderson, Henry, Kane and 11 more91 min
Jun 17, 4:11 AM CDTTornado WatchSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 16 more3 hr
Jun 17, 4:58 AM CDTMesoscale DiscussionSPCBoone, Cook, DuPage, Kane, Lake, McHenry62 min
Jun 17, 1:58 PM CDTMesoscale DiscussionSPCBureau, Grundy, Henry, Iroquois, Kankakee, Kendall and 11 more92 min
Jun 16, 9:11 PM CDTMesoscale DiscussionSPCAudubon, Boone, Calhoun, Carroll, Cherokee, Crawford and 15 more64 min
Jun 16, 9:56 PM CDTSevere Thunderstorm WatchSPCAdair, Appanoose, Audubon, Boone, Buena Vista, Calhoun and 34 more5 hr
Jun 16, 11:11 PM CDTMesoscale DiscussionSPCAdair, Audubon, Boone, Buena Vista, Calhoun, Carroll and 23 more64 min
Jun 17, 5:12 PM CDTMesoscale DiscussionSPCBuena Vista, Cherokee, Clay, Lyon, O'Brien, Osceola and 2 more2 hr
Jun 17, 6:48 PM CDTTornado WatchSPCBuena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 6 more6 hr

Nearby

Mesoscale Discussions in Illinois, 2014Mesoscale Discussions in Wisconsin, 2014Mesoscale Discussions in Iowa, 2014Every mesoscale discussion in 2014

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.