Alert archive / Illinois / Mesoscale Discussions in 2014

Mesoscale Discussion 1217

June 30, 20146 states

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2014, 3:25 PM CDT for 6 states. It was in force for 35 min.

The area

The outline as issued.

The facts

Issued
Jun 30, 2014, 3:25 PM CDT (20:25 UTC)
Expired
Jun 30, 2014, 4:00 PM CDT
In force
35 min
Issued by
the Storm Prediction Center
All 103 counties

Allamakee County, IA, Benton County, IA, Buchanan County, IA, Cedar County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McHenry County, IL, McLean County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Schuyler County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Newton County, IN, Porter County, IN, Starke County, IN, Berrien County, MI, Van Buren County, MI, Clark County, MO, Scotland County, MO, Calumet County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Manitowoc County, WI, Marquette County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Sheboygan County, WI, Vernon County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI, Winnebago County, WI

The radar

The Quad Cities radar (KDVN), 78 km from the middle of the area, began a volume at 20:28 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 12:00Z, 8.4 hours before the alert went out and 72 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 12:00Z on 2014-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1426 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 12:00Z on 2014-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 253 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
1426 J/kg
Mixed-layer CIN
-49 J/kg
Mixed-layer LCL
544 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
253 m²/s²
0-3 km storm-relative helicity
262 m²/s²
Significant tornado parameter
2.3
Supercell composite
15.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 29, 8:15 PM CDTSevere Thunderstorm WatchSPCCarroll, Jo Daviess, Rock Island, Stephenson, Whiteside7 hr
Jun 29, 9:43 PM CDTMesoscale DiscussionSPCCarroll, Jo Daviess, Stephenson92 min
Jun 29, 10:54 PM CDTTornado WatchSPCBoone, Carroll, DeKalb, Jo Daviess, Kane, Lee and 5 more5 hr
Jun 30, 1:41 AM CDTMesoscale DiscussionSPCBureau, Cook, DeKalb, DuPage, Grundy, Kane and 11 more64 min
Jun 30, 10:18 AM CDTMesoscale DiscussionSPCChristian, Logan, Macon, Mason, Menard, Montgomery and 5 more87 min
Jun 30, 1:27 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Champaign, DeKalb, DeWitt and 36 more93 min
Jun 30, 2:03 PM CDTTornado WatchSPCBoone, Bureau, Carroll, DeKalb, Fulton, Hancock and 22 more5 hr
Jun 30, 3:33 PM CDTSevere Thunderstorm Watch PDSSPCCook, DuPage, Ford, Grundy, Iroquois, Kane and 6 more7 hr
Jun 30, 4:33 PM CDTMesoscale DiscussionSPCBoone, Cook, DeKalb, DuPage, Kane, Kendall and 6 more117 min
Jun 30, 5:29 PM CDTTornado WatchSPCAdams, Brown, Pike6 hr
Jun 30, 6:08 PM CDTMesoscale DiscussionSPCDeWitt, LaSalle, McLean, Marshall, Peoria, Putnam and 3 more67 min
Jun 30, 6:28 PM CDTMesoscale DiscussionSPCJo Daviess, Rock Island92 min
Jun 29, 7:50 PM CDTMesoscale DiscussionSPCBuchanan, Clayton, Delaware, Dubuque, Fayette, Jackson and 2 more85 min
Jun 29, 10:10 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Clarke, Dallas, Decatur and 16 more65 min
Jun 30, 3:32 AM CDTMesoscale DiscussionSPCAudubon, Boone, Calhoun, Carroll, Cherokee, Crawford and 15 more58 min
Jun 30, 4:06 AM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Boone, Calhoun and 42 more10 hr
Jun 30, 7:16 AM CDTMesoscale DiscussionSPCAudubon, Benton, Black Hawk, Boone, Bremer, Buchanan and 36 more89 min
Jun 30, 9:08 AM CDTMesoscale DiscussionSPCAdair, Adams, Cass, Harrison, Mills, Montgomery and 2 more67 min
Jun 30, 9:38 AM CDTTornado WatchSPCAdair, Adams, Appanoose, Audubon, Black Hawk, Boone and 46 more10 hr
Jun 30, 10:48 AM CDTMesoscale DiscussionSPCAudubon, Calhoun, Carroll, Crawford, Greene, Guthrie and 7 more87 min
Jun 30, 3:17 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Boone, Carroll and 28 more58 min
Jun 29, 7:48 PM CDTMesoscale DiscussionSPCBaraga, Gogebic, Houghton, Iron, Marquette, Ontonagon87 min
Jun 30, 6:47 PM CDTMesoscale DiscussionSPCAllegan, Barry, Clare, Clinton, Crawford, Gladwin and 21 more88 min
Jun 29, 9:02 PM CDTMesoscale DiscussionSPCAndrew, Buchanan, Caldwell, Carroll, Cass, Chariton and 19 more88 min
Jun 29, 11:36 PM CDTMesoscale DiscussionSPCBuchanan, Caldwell, Carroll, Chariton, Clay, Clinton and 11 more54 min
Jun 30, 12:06 PM CDTMesoscale DiscussionSPCAndrew, Buchanan, Clay, Clinton, DeKalb, Holt and 2 more54 min
Jun 30, 3:52 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Clay, Clinton, Daviess and 7 more113 min
Jun 30, 5:12 PM CDTMesoscale DiscussionSPCAdair, Andrew, Buchanan, Caldwell, Clark, Clinton and 20 more63 min

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.