Alert archive / Illinois / Mesoscale Discussions in 2017

Mesoscale Discussion 1071

June 17, 20175 states

The Storm Prediction Center issued this mesoscale discussion at Jun 17, 2017, 2:44 PM CDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jun 17, 2017, 2:44 PM CDT (19:44 UTC)
Expired
Jun 17, 2017, 4:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 67 counties

Appanoose County, IA, Cedar County, IA, Clinton County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Adams County, IL, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry 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, McDonough County, IL, McHenry 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, Lake County, IN, LaPorte County, IN, Porter County, IN, Adair County, MO, Clark County, MO, Knox County, MO, Lewis County, MO, Schuyler County, MO, Scotland County, MO, Kenosha County, WI, Walworth County, WI

The radar

The Quad Cities radar (KDVN), 67 km from the middle of the area, began a volume at 19:47 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, 7.7 hours before the alert went out and 63 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 2017-06-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 613 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 2017-06-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 122 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
613 J/kg
Mixed-layer CIN
-75 J/kg
Mixed-layer LCL
726 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
122 m²/s²
0-3 km storm-relative helicity
159 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.2

Open this sounding in Storm Lab

The text

As transmitted.

<!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 16, 10:25 PM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, DeKalb, Henry, Jo Daviess and 9 more5 hr
Jun 17, 1:35 AM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, Henry, Jo Daviess and 15 more115 min
Jun 17, 5:39 PM CDTSevere Thunderstorm WatchSPCAdams, Boone, Brown, Bureau, Cass, Champaign and 45 more7 hr
Jun 16, 7:52 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Boone, Cass and 23 more9 hr
Jun 16, 9:27 PM CDTMesoscale DiscussionSPCAdams, Fremont, Mills, Montgomery, Page, Ringgold and 1 more2 hr
Jun 16, 11:14 PM CDTMesoscale DiscussionSPCAdair, Audrain, Bates, Benton, Boone, Buchanan and 37 more91 min
Jun 16, 11:36 PM CDTSevere Thunderstorm WatchSPCAudrain, Boone, Callaway, Cole, Gasconade, Knox and 11 more3 hr
Jun 17, 12:09 AM CDTSevere Thunderstorm WatchSPCBarry, Barton, Benton, Camden, Cedar, Dade and 18 more9 hr
Jun 17, 2:58 AM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Camden, Cedar, Christian and 25 more2 hr
Jun 17, 5:31 AM CDTMesoscale DiscussionSPCBarry, Barton, Cedar, Christian, Dade, Greene and 7 more89 min
Jun 17, 3:45 PM CDTMesoscale DiscussionSPCAndrew, Bates, Buchanan, Caldwell, Carroll, Cass and 11 more3 hr
Jun 17, 6:12 PM CDTSevere Thunderstorm WatchSPCBates, Buchanan, Caldwell, Carroll, Cass, Chariton and 20 more7 hr

Nearby

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