Alert archive / Iowa / Mesoscale Discussions in 2014

Mesoscale Discussion 119

February 20, 201437 counties in Iowa; 13 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Feb 20, 2014, 10:20 AM CST for 37 counties in Iowa; 13 counties in Missouri. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
Feb 20, 2014, 10:20 AM CST (16:20 UTC)
Expired
Feb 20, 2014, 11:45 AM CST
In force
85 min
Issued by
the Storm Prediction Center
Chance of a watch
5%
All 50 counties

Appanoose County, IA, Benton County, IA, Buchanan County, IA, Cedar County, IA, Clarke County, IA, Clinton County, IA, Davis County, IA, Decatur County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Muscatine County, IA, Poweshiek County, IA, Ringgold County, IA, Scott County, IA, Tama County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Adair County, MO, Clark County, MO, Daviess County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Knox County, MO, Mercer County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Sullivan County, MO, Worth County, MO

The radar

The Des Moines radar (KDMX), 113 km from the middle of the area, began a volume at 16:20 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

Davenport, (KDVN), launched 12:00Z, 4.3 hours before the alert went out and 181 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 2014-02-20Temperature 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, Davenport, at 12:00Z on 2014-02-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 258 square meters per square second.1939587897117Sfc1 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
442 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
258 m²/s²
0-3 km storm-relative helicity
263 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
Feb 20, 4:24 AM CSTMesoscale DiscussionSPCDecatur, Ringgold2 hr
Feb 20, 5:28 AM CSTMesoscale DiscussionSPCCherokee, Harrison, Lyon, Monona, O'Brien, Osceola and 3 more5 hr
Feb 20, 11:20 AM CSTMesoscale DiscussionSPCAdair, Audubon, Black Hawk, Boone, Bremer, Buena Vista and 39 more6 hr
Feb 20, 2:43 AM CSTMesoscale DiscussionSPCBenton, Camden, Cedar, Cole, Crawford, Dade and 29 more3 hr
Feb 20, 11:34 AM CSTMesoscale DiscussionSPCAudrain, Boone, Callaway, Camden, Chariton, Cole and 25 more116 min
Feb 20, 1:36 PM CSTSevere Thunderstorm WatchSPCCrawford, Franklin, Gasconade, Iron, Jefferson, Lincoln and 12 more4 hr
Feb 20, 1:45 PM CSTMesoscale DiscussionSPCDunklin, Mississippi, New Madrid, Pemiscot, Scott, Stoddard2 hr
Feb 20, 2:23 PM CSTTornado WatchSPCBollinger, Butler, Cape Girardeau, Carter, Dunklin, Mississippi and 7 more7 hr
Feb 20, 3:23 PM CSTMesoscale DiscussionSPCJefferson, Saint Charles, Saint Louis, City of Saint Louis97 min
Feb 20, 5:29 PM CSTMesoscale DiscussionSPCBollinger, Cape Girardeau, Dunklin, Mississippi, New Madrid, Pemiscot and 3 more46 min

Nearby

Mesoscale Discussions in Iowa, 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.