Alert archive / Alabama / Mesoscale Discussions in 2012

Mesoscale Discussion 329

March 22, 20126 counties in Alabama; Escambia County, Florida

The Storm Prediction Center issued this mesoscale discussion at Mar 22, 2012, 3:30 PM CDT for 6 counties in Alabama; Escambia County, Florida. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Mar 22, 2012, 3:30 PM CDT (20:30 UTC)
Expired: Mar 22, 2012, 4:30 PM CDT
In force: 60 min
Issued by: the Storm Prediction Center

Counties Baldwin County, AL, Conecuh County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Wilcox County, AL, Escambia County, FL

The radar

The Mobile radar (KMOB), 62 km from the middle of the area, began a volume at 20:34 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.5 hours before the alert went out and 210 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: 2 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 438 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 377 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.3

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 22, 2:28 AM CDT	Mesoscale Discussion	SPC	Mobile, Washington	2 hr
Mar 22, 6:49 AM CDT	Mesoscale Discussion	SPC	Mobile	116 min
Mar 22, 9:53 AM CDT	Mesoscale Discussion	SPC	Baldwin, Clarke, Mobile, Washington	67 min
Mar 22, 10:55 AM CDT	Tornado Watch	SPC	Baldwin, Clarke, Mobile, Monroe, Washington, Wilcox	6 hr
Mar 22, 1:00 PM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Bibb, Butler, Chilton, Conecuh and 10 more	60 min

Nearby

Mesoscale Discussions in Alabama, 2012 Mesoscale Discussions in Florida, 2012 Every mesoscale discussion in 2012

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.