Alert archive / Louisiana / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 24, NWS Lake Charles, LA

April 25, 20157 parishes in Louisiana

NWS Lake Charles, LA issued this severe thunderstorm warning at Apr 25, 2015, 10:42 AM CDT for 7 parishes in Louisiana. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 25, 2015, 10:42 AM CDT (15:42 UTC)
Expired: Apr 25, 2015, 11:33 AM CDT
In force: 51 min
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon

Counties Acadia Parish, LA, Iberia Parish, LA, Lafayette Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Vermilion Parish, LA

The radar

The Lake Charles radar (KLCH), 122 km from the middle of the area, began a volume at 15:44 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 25, 7:12 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.7 hours before the alert went out and 219 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: 1826 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 565 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 4.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Lake Charles, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 24, 6:46 PM CDT, 15 hours 56 minutes earlier.

Area forecast discussion, Apr 24, 6:46 PM CDT, 15 hours 56 minutes before

<!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>

The office that day

Everything else NWS Lake Charles, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 25, 8:33 AM CDT	Special Marine Warning	LCH		87 min
Apr 25, 8:44 AM CDT	Special Weather Statement	LCH	Cameron	91 min
Apr 25, 9:10 AM CDT	Special Weather Statement	LCH	Rapides	80 min
Apr 25, 9:34 AM CDT	Areal Flood Advisory	LCH	Calcasieu, Cameron	3 hr
Apr 25, 9:53 AM CDT	Special Weather Statement	LCH	Acadia, Cameron, Jefferson Davis	97 min
Apr 25, 9:59 AM CDT	Severe Thunderstorm Warning	LCH	Acadia, Jefferson Davis, Lafayette, Saint Landry, Saint Martin, Vermilion	46 min
Apr 25, 10:00 AM CDT	Special Marine Warning	LCH		90 min
Apr 25, 10:05 AM CDT	Severe Thunderstorm Warning	LCH	Acadia, Calcasieu, Cameron, Jefferson Davis, Vermilion	40 min
Apr 25, 10:26 AM CDT	Severe Thunderstorm Warning	LCH	Cameron, Vermilion	34 min
Apr 25, 10:34 AM CDT	Special Weather Statement	LCH	Lafayette, Vermilion	71 min
Apr 25, 10:39 AM CDT	Areal Flood Advisory	LCH	Acadia, Lafayette, Saint Landry, Saint Martin, Vermilion	3 hr
Apr 25, 10:48 AM CDT	Special Marine Warning	LCH		117 min
Apr 25, 10:56 AM CDT	Special Marine Warning	LCH		2 hr
Apr 25, 11:01 AM CDT	Severe Thunderstorm Warning	LCH	Cameron, Iberia, St. Mary, Vermilion	44 min
Apr 25, 11:27 AM CDT	Severe Thunderstorm Warning	LCH	Iberia, Lafayette, Saint Landry, Saint Martin, St. Mary, Vermilion	33 min
Apr 25, 11:43 AM CDT	Special Marine Warning	LCH		2 hr
Apr 25, 11:56 AM CDT	Severe Thunderstorm Warning	LCH	Iberia, Saint Martin, St. Mary, Vermilion	79 min
Apr 25, 12:50 PM CDT	Special Marine Warning	LCH		85 min
Apr 25, 2:54 PM CDT	Special Marine Warning	LCH		96 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2015 Every severe thunderstorm warning 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.