Alert archive / Illinois / Mesoscale Discussions in 2017

Mesoscale Discussion 224

February 28, 20176 states

The Storm Prediction Center issued this mesoscale discussion at Feb 28, 2017, 7:46 PM CST for 6 states. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Feb 28, 2017, 7:46 PM CST (01:46 UTC)
Expired: Feb 28, 2017, 9:45 PM CST
In force: 119 min
Issued by: the Storm Prediction Center

All 113 counties

Baxter County, AR, Clay County, AR, Cleburne County, AR, Craighead County, AR, Cross County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Alexander County, IL, Clay County, IL, Crawford County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Johnson County, IL, Lawrence County, IL, Marion County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Richland County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Brown County, IN, Crawford County, IN, Daviess County, IN, Dubois County, IN, Gibson County, IN, Greene County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Monroe County, IN, Orange County, IN, Owen County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Sullivan County, IN, Vanderburgh County, IN, Warrick County, IN, Washington County, IN, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Fulton County, KY, Graves County, KY, Hancock 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, Dunklin County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Pemiscot County, MO, Perry County, MO, Ripley County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO, Crockett County, TN, Dyer County, TN, Gibson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Tipton County, TN, Weakley County, TN

The radar

The Paducah radar (KPAH), 41 km from the middle of the area, began a volume at 01:50 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 00:00Z, 1.8 hours before the alert went out and 258 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 66 J/kg
Mixed-layer CIN: -155 J/kg
Mixed-layer LCL: 832 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 411 m²/s²
0-3 km storm-relative helicity: 386 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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.

Issued	Product	Office	Counties	Lasted
Feb 28, 8:29 PM CST	Tornado Watch	SPC	Clay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 1 more	12 hr
Feb 28, 9:04 PM CST	Tornado Watch	SPC	Benton, Carroll, Madison, Washington	7 hr
Feb 28, 10:46 PM CST	Mesoscale Discussion	SPC	Boone, Carroll, Conway, Crawford, Franklin, Garland and 20 more	119 min
Feb 28, 11:35 PM CST	Tornado Watch	SPC	Baxter, Boone, Cleburne, Conway, Crawford, Faulkner and 24 more	5 hr
Mar 1, 2:09 AM CST	Mesoscale Discussion	SPC	Arkansas, Clark, Clay, Cleburne, Cleveland, Conway and 38 more	2 hr
Mar 1, 3:03 AM CST	Tornado Watch	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 4 more	5 hr
Mar 1, 4:19 AM CST	Mesoscale Discussion	SPC	Crittenden	56 min
Feb 28, 8:06 PM CST	Mesoscale Discussion	SPC	Adams, Brown, Bureau, Cass, Champaign, Christian and 37 more	84 min
Feb 28, 9:51 PM CST	Tornado Watch	SPC	Cass, Champaign, Christian, Clark, Clay, Coles and 37 more	6 hr
Feb 28, 10:09 PM CST	Mesoscale Discussion	SPC	Edwards, Franklin, Gallatin, Hamilton, Jackson, Johnson and 5 more	66 min
Feb 28, 11:52 PM CST	Mesoscale Discussion	SPC	Champaign, Ford, Iroquois, Vermilion	53 min
Feb 28, 6:00 PM CST	Mesoscale Discussion	SPC	Adams, Allen, Cass, DeKalb, Elkhart, Fulton and 14 more	90 min
Feb 28, 6:37 PM CST	Severe Thunderstorm Watch	SPC	Allen, DeKalb, Elkhart, Fulton, Kosciusko, LaGrange and 8 more	8 hr
Feb 28, 8:41 PM CST	Mesoscale Discussion	SPC	Allen, DeKalb, Elkhart, Fulton, Kosciusko, LaGrange and 9 more	94 min
Feb 28, 10:03 PM CST	Mesoscale Discussion	SPC	Adams, Allen, Bartholomew, Blackford, Boone, Carroll and 48 more	117 min
Feb 28, 10:29 PM CST	Tornado Watch	SPC	Adams, Allen, Blackford, Boone, Carroll, Cass and 41 more	8 hr
Mar 1, 12:44 AM CST	Mesoscale Discussion	SPC	Adams, Allen, Blackford, Boone, Carroll, Cass and 28 more	61 min
Mar 1, 1:32 AM CST	Mesoscale Discussion	SPC	Clark, Crawford, Dearborn, Dubois, Floyd, Harrison and 11 more	88 min
Mar 1, 4:57 AM CST	Tornado Watch	SPC	Clark, Crawford, Dearborn, Dubois, Floyd, Franklin and 9 more	5 hr
Mar 1, 5:28 AM CST	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Bath, Bell and 88 more	2 hr
Mar 1, 5:48 AM CST	Severe Thunderstorm Watch	SPC	Boyd, Carter, Greenup	5 hr
Mar 1, 6:47 AM CST	Severe Thunderstorm Watch	SPC	Bath, Bell, Breathitt, Clay, Elliott, Estill and 28 more	5 hr
Mar 1, 7:28 AM CST	Mesoscale Discussion	SPC	Bell, Boyd, Breathitt, Carter, Clay, Clinton and 32 more	92 min
Mar 1, 2:56 PM CST	Mesoscale Discussion	SPC	Boyd, Breathitt, Carter, Elliott, Floyd, Greenup and 8 more	2 hr
Feb 28, 6:05 PM CST	Mesoscale Discussion	SPC	Adair, Audrain, Barton, Bates, Benton, Boone and 39 more	115 min
Feb 28, 6:23 PM CST	Tornado Watch	SPC	Adair, Bates, Carroll, Cass, Chariton, Cooper and 15 more	5 hr
Feb 28, 10:01 PM CST	Mesoscale Discussion	SPC	Barry, Barton, Bates, Benton, Camden, Cedar and 14 more	119 min
Mar 1, 12:16 AM CST	Mesoscale Discussion	SPC	Barton, Camden, Cedar, Christian, Cole, Crawford and 28 more	89 min
Mar 1, 10:08 AM CST	Mesoscale Discussion	SPC	Bedford, Bradley, Coffee, Franklin, Giles, Grundy and 11 more	2 hr
Mar 1, 11:48 AM CST	Tornado Watch	SPC	Bledsoe, Blount, Bradley, Franklin, Hamilton, Knox and 12 more	6 hr
Mar 1, 2:11 PM CST	Mesoscale Discussion	SPC	Bradley, McMinn, Polk	2 hr

Nearby

Mesoscale Discussions in Illinois, 2017 Mesoscale Discussions in Kentucky, 2017 Mesoscale Discussions in Arkansas, 2017 Every 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.