Alert archive / Illinois / Mesoscale Discussions in 2014

Mesoscale Discussion 1867

October 13, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Oct 13, 2014, 8:05 AM CDT for 4 states. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
Oct 13, 2014, 8:05 AM CDT (13:05 UTC)
Expired
Oct 13, 2014, 10:00 AM CDT
In force
115 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 60 counties

Alexander County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saline County, IL, Union County, IL, Washington County, IL, White County, IL, Williamson County, IL, Gibson County, IN, Posey County, IN, Vanderburgh County, IN, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Henderson County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Trigg County, KY, Union County, KY, Webster County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Howell County, MO, Iron County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Wayne County, MO

The radar

The Paducah radar (KPAH), 54 km from the middle of the area, began a volume at 13:08 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

Nashville Metro, TN (KBNA), launched 12:00Z, 1.1 hours before the alert went out and 272 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, Nashville Metro, TN at 12:00Z on 2014-10-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Nashville Metro, TN at 12:00Z on 2014-10-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 305 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
830 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
305 m²/s²
0-3 km storm-relative helicity
400 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Oct 13, 10:29 AM CDTTornado WatchSPCAlexander, Bond, Clinton, Edwards, Fayette, Franklin and 26 more8 hr
Oct 13, 1:08 PM CDTMesoscale DiscussionSPCChampaign, Clark, Coles, Crawford, Cumberland, DeWitt and 12 more2 hr
Oct 13, 1:33 PM CDTMesoscale DiscussionSPCAlexander, Bond, Clinton, Jackson, Perry, Pulaski and 3 more57 min
Oct 13, 2:24 PM CDTTornado WatchSPCChampaign, Christian, Clark, Clay, Coles, Crawford and 22 more7 hr
Oct 13, 3:19 PM CDTMesoscale DiscussionSPCBond, Clay, Clinton, Fayette, Franklin, Gallatin and 16 more86 min
Oct 13, 3:42 PM CDTMesoscale DiscussionSPCBond, Champaign, Christian, Clark, Coles, Crawford and 21 more93 min
Oct 13, 5:47 PM CDTMesoscale DiscussionSPCClark, Crawford, Edgar, Edwards, Lawrence, Wabash88 min
Oct 13, 2:54 PM CDTMesoscale DiscussionSPCBartholomew, Brown, Clark, Clay, Crawford, Daviess and 23 more2 hr
Oct 13, 3:54 PM CDTTornado WatchSPCBartholomew, Boone, Brown, Carroll, Clark, Clay and 47 more8 hr
Oct 13, 12:00 AM CDTMesoscale DiscussionSPCMcDonald, Newton90 min
Oct 13, 12:55 AM CDTSevere Thunderstorm WatchSPCBarry, Christian, Douglas, Lawrence, McDonald, Newton and 3 more7 hr
Oct 13, 1:59 AM CDTMesoscale DiscussionSPCBarry, Christian, Douglas, Lawrence, McDonald, Newton and 3 more91 min
Oct 13, 6:34 AM CDTMesoscale DiscussionSPCDunklin, Pemiscot86 min
Oct 13, 6:56 AM CDTMesoscale DiscussionSPCChristian, Douglas, Ozark, Stone, Taney64 min
Oct 13, 7:08 AM CDTTornado WatchSPCDunklin, Pemiscot7 hr
Oct 13, 10:20 AM CDTMesoscale DiscussionSPCDunklin, Pemiscot115 min
Oct 13, 11:52 AM CDTMesoscale DiscussionSPCDunklin, Pemiscot113 min
Oct 13, 11:59 AM CDTMesoscale DiscussionSPCBollinger, Butler, Madison, Perry, Sainte Genevieve, Saint Francois and 2 more61 min
Oct 13, 12:57 PM CDTTornado WatchSPCDunklin, Pemiscot7 hr

Nearby

Mesoscale Discussions in Illinois, 2014Mesoscale Discussions in Kentucky, 2014Mesoscale Discussions in Missouri, 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.