Alert archive / Illinois / Mesoscale Discussions in 2013

Mesoscale Discussion 720

May 19, 20134 states

The Storm Prediction Center issued this mesoscale discussion at May 19, 2013, 10:58 PM CDT for 4 states. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
May 19, 2013, 10:58 PM CDT (03:58 UTC)
Expired
May 20, 2013, 12:00 AM CDT
In force
62 min
Issued by
the Storm Prediction Center
All 72 counties

Allamakee County, IA, Cedar County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Washington County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Kane County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Winnebago County, IL, Houston County, MN, Adams County, WI, Clark County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jackson County, WI, Jefferson County, WI, Juneau County, WI, La Crosse County, WI, Lafayette County, WI, Marquette County, WI, Monroe County, WI, Portage County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Trempealeau County, WI, Vernon County, WI, Walworth County, WI, Waushara County, WI, Wood County, WI

The radar

The Quad Cities radar (KDVN), 68 km from the middle of the area, began a volume at 04:00 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

Lincoln, IL (KILX), launched 00:00Z, 4.0 hours before the alert went out and 275 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, Lincoln, IL at 00:00Z on 2013-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2039 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, Lincoln, IL at 00:00Z on 2013-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 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
2039 J/kg
Mixed-layer CIN
-36 J/kg
Mixed-layer LCL
1598 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
149 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

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
May 19, 7:13 PM CDTMesoscale DiscussionSPCHancock, Henderson, Henry, Mercer, Rock Island, Warren62 min
May 19, 7:46 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Henry, Jo Daviess, Knox and 11 more59 min
May 19, 8:10 PM CDTTornado WatchSPCBoone, Bureau, Carroll, DeKalb, Fulton, Hancock and 25 more6 hr
May 19, 10:16 PM CDTMesoscale DiscussionSPCAdams, Brown, Pike59 min
May 20, 3:27 PM CDTMesoscale DiscussionSPCBrown, Calhoun, Cass, Champaign, Christian, DeWitt and 21 more63 min
May 20, 5:07 PM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Greene, Jersey and 9 more23 min
May 20, 5:24 PM CDTTornado WatchSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 31 more7 hr
May 20, 6:35 PM CDTSevere Thunderstorm WatchSPCHenderson, Mercer, Warren5 hr
May 19, 8:21 PM CDTMesoscale DiscussionSPCButler, Cerro Gordo, Emmet, Franklin, Grundy, Hamilton and 9 more54 min
May 19, 9:11 PM CDTMesoscale DiscussionSPCAppanoose, Davis, Decatur, Jasper, Lucas, Mahaska and 7 more64 min
May 20, 5:38 PM CDTMesoscale DiscussionSPCBoone, Butler, Clarke, Dallas, Decatur, Franklin and 14 more67 min
May 19, 9:38 PM CDTMesoscale DiscussionSPCChippewa, Iron, Price, Rusk67 min
May 20, 1:41 AM CDTMesoscale DiscussionSPCAdams, Columbia, Dane, Dodge, Fond du Lac, Green and 6 more79 min

Nearby

Mesoscale Discussions in Illinois, 2013Mesoscale Discussions in Wisconsin, 2013Mesoscale Discussions in Iowa, 2013Every mesoscale discussion in 2013

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.