Alert archive / Mississippi / Mesoscale Discussions in 2019

Mesoscale Discussion 441

April 25, 2019Chicot County, Arkansas; 8 parishes in Louisiana; 18 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2019, 5:02 AM CDT for Chicot County, Arkansas; 8 parishes in Louisiana; 18 counties in Mississippi. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Apr 25, 2019, 5:02 AM CDT (10:02 UTC)
Expired: Apr 25, 2019, 6:00 AM CDT
In force: 58 min
Issued by: the Storm Prediction Center

All 27 counties

Chicot County, AR, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Adams County, MS, Bolivar County, MS, Carroll County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Leflore County, MS, Sharkey County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 113 km from the middle of the area, began a volume at 10:06 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.

Tornado Watch 102Apr 25, 8:10 AM CDT

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 10.0 hours before the alert went out and 104 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: 3 J/kg
Mixed-layer CIN: -196 J/kg
Mixed-layer LCL: 1500 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Apr 25, 2:43 AM CDT	Severe Thunderstorm Watch	SPC	Ashley, Chicot	6 hr
Apr 24, 7:35 PM CDT	Mesoscale Discussion	SPC	Vernon	85 min
Apr 24, 11:19 PM CDT	Mesoscale Discussion	SPC	Beauregard, Natchitoches, Sabine, Vernon	86 min
Apr 24, 11:52 PM CDT	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 19 more	8 hr
Apr 24, 11:57 PM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Claiborne, De Soto, Natchitoches, Red River and 2 more	63 min
Apr 25, 2:08 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Bienville, Bossier and 24 more	67 min
Apr 25, 5:24 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Beauregard, Calcasieu, Evangeline, Grant and 7 more	66 min
Apr 25, 7:10 AM CDT	Mesoscale Discussion	SPC	Acadia, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia and 22 more	2 hr
Apr 25, 8:06 AM CDT	Tornado Watch	SPC	Acadia, Ascension, Assumption, Avoyelles, East Baton Rouge, East Feliciana and 26 more	8 hr
Apr 25, 11:48 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 17 more	117 min
Apr 25, 3:14 PM CDT	Mesoscale Discussion	SPC	Jefferson, Plaquemines, Saint Bernard	2 hr

Nearby

Mesoscale Discussions in Mississippi, 2019 Mesoscale Discussions in Louisiana, 2019 Mesoscale Discussions in Arkansas, 2019 Every mesoscale discussion in 2019

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.