Alert archive / Alabama / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 87, NWS Huntsville, AL

April 30, 2009Colbert County, Lauderdale County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Apr 30, 2009, 9:03 PM CDT for Colbert County, Lauderdale County, Alabama. It was in force for 42 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 30, 2009, 9:03 PM CDT (02:03 UTC)
Expired: Apr 30, 2009, 9:45 PM CDT
In force: 42 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon

Counties Colbert County, AL, Lauderdale County, AL

The radar

The Columbus AFB radar (KGWX), 115 km from the middle of the area, began a volume at 02:03 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

Nashville Metro, TN (KBNA), launched 00:00Z, 2.1 hours before the alert went out and 180 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: 1 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 1584 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 198 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Huntsville, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 30, 6:40 PM CDT, 2 hours 23 minutes earlier.

Area forecast discussion, Apr 30, 6:40 PM CDT, 2 hours 23 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>

Hazardous weather outlook, Apr 30, 4:22 PM CDT, 4 hours 41 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>

In the hours before

Special weather statement, Apr 30, 8:46 PM CDT, 17 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>

Special weather statement, Apr 30, 8:48 PM CDT, 15 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 Huntsville, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 1, 4:45 AM CDT	Severe Thunderstorm Warning	HUN	Lauderdale, Lawrence, Limestone	30 min
May 1, 11:47 AM CDT	Areal Flood Warning	HUN	Madison	6 hr
May 1, 2:47 PM CDT	Severe Thunderstorm Warning	HUN	Lauderdale	43 min
May 1, 3:42 PM CDT	Severe Thunderstorm Warning	HUN	Lauderdale, Limestone	48 min
May 1, 3:59 PM CDT	Tornado Warning	HUN	Lauderdale	31 min
May 1, 4:11 PM CDT	Flash Flood Watch	HUN	Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more	8 hr
May 1, 4:13 PM CDT	Severe Thunderstorm Warning	HUN	Lauderdale	32 min
May 1, 4:18 PM CDT	Severe Thunderstorm Warning	HUN	Jackson, Madison	42 min
May 1, 4:20 PM CDT	Severe Thunderstorm Warning	HUN	Lauderdale, Lawrence, Limestone	40 min
May 1, 4:40 PM CDT	Tornado Warning	HUN	Lauderdale, Lawrence, Limestone	17 min
May 1, 4:42 PM CDT	Severe Thunderstorm Warning	HUN	Madison	48 min
May 1, 4:53 PM CDT	Flash Flood Warning	HUN	Colbert, Lauderdale, Lawrence, Limestone, Morgan	6 hr
May 1, 4:58 PM CDT	Severe Thunderstorm Warning	HUN	Jackson, Madison	32 min
May 1, 5:18 PM CDT	Severe Thunderstorm Warning	HUN	Jackson, Marshall	42 min
May 1, 5:31 PM CDT	Flash Flood Warning	HUN	Jackson, Madison, Marshall, Morgan	6 hr
May 1, 5:35 PM CDT	Severe Thunderstorm Warning	HUN	Madison, Marshall, Morgan	40 min
May 1, 5:45 PM CDT	Tornado Warning	HUN	Jackson	15 min
May 1, 5:57 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Jackson	48 min
May 1, 6:15 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Marshall, Morgan	45 min
May 1, 6:23 PM CDT	Flash Flood Warning	HUN	Cullman, DeKalb, Jackson, Marshall, Morgan	6 hr
May 1, 3:27 PM CDT	Severe Thunderstorm Warning	HUN	Lincoln, Moore	48 min
May 1, 3:44 PM CDT	Tornado Warning	HUN	Lincoln	46 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2009 Every severe thunderstorm warning in 2009

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.