Alert archive / Arkansas / Mesoscale Discussions in 2017

Mesoscale Discussion 1733

October 22, 20174 states

The Storm Prediction Center issued this mesoscale discussion at Oct 22, 2017, 4:57 AM CDT for 4 states. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Oct 22, 2017, 4:57 AM CDT (09:57 UTC)
Expired
Oct 22, 2017, 6:30 AM CDT
In force
93 min
Issued by
the Storm Prediction Center
All 62 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Clay County, AR, Cleveland County, AR, Columbia County, AR, Craighead County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Greene County, AR, Independence County, AR, Jackson County, AR, Jefferson County, AR, Lafayette County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Ouachita County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Sharp County, AR, St. Francis County, AR, Union County, AR, White County, AR, Woodruff County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Red River Parish, LA, Union Parish, LA, Webster Parish, LA, Butler County, MO, Carter County, MO, Dent County, MO, Dunklin County, MO, Iron County, MO, Madison County, MO, Oregon County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Shannon County, MO, Stoddard County, MO, Wayne County, MO, Harrison County, TX, Panola County, TX, Rusk County, TX, Shelby County, TX

The radar

The Little Rock radar (KLZK), 51 km from the middle of the area, began a volume at 09:57 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

Springfield, MO (KSGF), launched 00:00Z, 10.0 hours before the alert went out and 307 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, Springfield, MO at 00:00Z on 2017-10-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 700 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, Springfield, MO at 00:00Z on 2017-10-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 157 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
700 J/kg
Mixed-layer CIN
-128 J/kg
Mixed-layer LCL
1064 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
157 m²/s²
0-3 km storm-relative helicity
169 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.4

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
Oct 21, 8:34 PM CDTMesoscale DiscussionSPCBenton, Washington86 min
Oct 21, 10:42 PM CDTMesoscale DiscussionSPCBenton, Crawford, Franklin, Howard, Little River, Logan and 6 more93 min
Oct 21, 11:56 PM CDTSevere Thunderstorm WatchSPCArkansas, Baxter, Benton, Boone, Bradley, Calhoun and 54 more7 hr
Oct 22, 1:44 AM CDTMesoscale DiscussionSPCBaxter, Boone, Carroll, Clark, Conway, Franklin and 24 more91 min
Oct 22, 5:41 AM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 17 more2 hr
Oct 21, 8:10 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Caldwell, Camden and 40 more95 min
Oct 21, 10:06 PM CDTSevere Thunderstorm WatchSPCBarry, Barton, Cedar, Christian, Dade, Dallas and 12 more5 hr
Oct 21, 7:53 PM CDTSevere Thunderstorm WatchSPCBrown, Callahan, Coleman, Collin, Comanche, Cooke and 28 more6 hr
Oct 21, 10:09 PM CDTMesoscale DiscussionSPCCallahan, Collin, Cooke, Dallas, Denton, Eastland and 14 more96 min

Nearby

Mesoscale Discussions in Arkansas, 2017Mesoscale Discussions in Missouri, 2017Mesoscale Discussions in Louisiana, 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.