Alert archive / Kentucky / Mesoscale Discussions in 2015

Mesoscale Discussion 146

March 25, 20155 states

The Storm Prediction Center issued this mesoscale discussion at Mar 25, 2015, 9:23 PM CDT for 5 states. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Mar 25, 2015, 9:23 PM CDT (02:23 UTC)
Expired: Mar 25, 2015, 11:00 PM CDT
In force: 97 min
Issued by: the Storm Prediction Center

All 37 counties

Clay County, AR, Greene County, AR, Alexander County, IL, Gallatin County, IL, Hardin County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, Ballard County, KY, Calloway County, KY, Carlisle County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO, Henry County, TN, Lake County, TN, Obion County, TN, Weakley County, TN

The radar

The Paducah radar (KPAH), 76 km from the middle of the area, began a volume at 02:24 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

Little Rock, AR (KBYH), launched 00:00Z, 2.4 hours before the alert went out and 227 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: 264 J/kg
Mixed-layer CIN: -213 J/kg
Mixed-layer LCL: 1469 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 165 m²/s²
0-3 km storm-relative helicity: 315 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.7

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.

Issued	Product	Office	Counties	Lasted
Mar 25, 7:02 PM CDT	Severe Thunderstorm Watch	SPC	Clay, Craighead, Greene, Lawrence, Mississippi, Randolph	7 hr
Mar 25, 7:54 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 19 more	66 min
Mar 25, 9:21 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Boone, Cleburne, Conway, Crawford, Faulkner and 33 more	8 hr
Mar 25, 11:39 PM CDT	Mesoscale Discussion	SPC	Cleburne, Conway, Faulkner, Franklin, Garland, Independence and 17 more	96 min
Mar 26, 1:35 AM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Greene	25 min
Mar 26, 2:17 AM CDT	Mesoscale Discussion	SPC	Clark, Garland, Grant, Hempstead, Hot Spring, Howard and 8 more	58 min

Nearby

Mesoscale Discussions in Kentucky, 2015 Mesoscale Discussions in Missouri, 2015 Mesoscale Discussions in Illinois, 2015 Every mesoscale discussion in 2015

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.