Alert archive / Arkansas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 428, NWS Little Rock, AR

September 6, 20124 counties in Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Sep 6, 2012, 7:43 PM CDT for 4 counties in Arkansas. It was in force for 47 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: Sep 6, 2012, 7:43 PM CDT (00:43 UTC)
Expired: Sep 6, 2012, 8:30 PM CDT
In force: 47 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon

Counties Boone County, AR, Marion County, AR, Newton County, AR, Searcy County, AR

The radar

The Springfield radar (KSGF), 133 km from the middle of the area, began a volume at 00:47 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

Springfield, MO (KSGF), launched 00:00Z, 0.7 hours before the alert went out and 118 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: 348 J/kg
Mixed-layer CIN: -236 J/kg
Mixed-layer LCL: 2009 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 208 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.5

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 Little Rock, AR wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 6, 7:12 PM CDT, 31 minutes earlier.

Area forecast discussion, Sep 6, 7:12 PM CDT, 31 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, Sep 6, 5:15 PM CDT, 2 hours 28 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, Sep 6, 4:52 PM CDT, 2 hours 51 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, Sep 6, 5:42 PM CDT, 2 hours 1 minute 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, Sep 6, 6:44 PM CDT, 59 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, Sep 6, 7:18 PM CDT, 25 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 Little Rock, AR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 6, 7:18 PM CDT	Special Weather Statement	LZK	Pope	47 min
Sep 6, 7:49 PM CDT	Special Weather Statement	LZK	Polk	46 min
Sep 6, 8:02 PM CDT	Special Weather Statement	LZK	Pope	48 min
Sep 6, 8:02 PM CDT	Severe Thunderstorm Warning	LZK	Montgomery, Polk, Scott	28 min
Sep 6, 8:13 PM CDT	Special Weather Statement	LZK	Marion	47 min
Sep 6, 8:23 PM CDT	Severe Thunderstorm Warning	LZK	Newton, Pope, Searcy	13 min
Sep 6, 8:35 PM CDT	Special Weather Statement	LZK	Boone	45 min
Sep 6, 8:45 PM CDT	Special Weather Statement	LZK	Searcy	45 min
Sep 6, 9:32 PM CDT	Special Weather Statement	LZK	Marion, Searcy	48 min
Sep 7, 2:15 PM CDT	Special Weather Statement	LZK	Baxter	30 min
Sep 7, 2:32 PM CDT	Severe Thunderstorm Warning	LZK	Baxter, Fulton, Marion	43 min
Sep 7, 3:02 PM CDT	Special Weather Statement	LZK	Fulton	43 min
Sep 7, 3:11 PM CDT	Severe Thunderstorm Warning	LZK	Baxter, Fulton, Izard	49 min
Sep 7, 3:14 PM CDT	Severe Thunderstorm Warning	LZK	Fulton, Sharp	46 min
Sep 7, 3:22 PM CDT	Flash Flood Warning	LZK	Baxter, Marion	3 hr
Sep 7, 3:33 PM CDT	Severe Thunderstorm Warning	LZK	Fulton	17 min
Sep 7, 3:56 PM CDT	Severe Thunderstorm Warning	LZK	Baxter	49 min
Sep 7, 4:03 PM CDT	Special Weather Statement	LZK	Sharp	47 min
Sep 7, 4:10 PM CDT	Severe Thunderstorm Warning	LZK	Fulton, Izard, Sharp	50 min
Sep 7, 4:40 PM CDT	Severe Thunderstorm Warning	LZK	Sharp	50 min
Sep 7, 5:19 PM CDT	Special Weather Statement	LZK	Johnson	31 min
Sep 7, 5:50 PM CDT	Special Weather Statement	LZK	Boone, Marion	45 min
Sep 7, 5:52 PM CDT	Severe Thunderstorm Warning	LZK	Cleburne, Independence, Jackson, White	23 min
Sep 7, 6:00 PM CDT	Severe Thunderstorm Warning	LZK	Boone, Johnson, Marion, Newton, Searcy	45 min
Sep 7, 6:06 PM CDT	Severe Thunderstorm Warning	LZK	Johnson, Pope	39 min
Sep 7, 6:23 PM CDT	Severe Thunderstorm Warning	LZK	Pope, Searcy, Van Buren	26 min
Sep 7, 6:32 PM CDT	Severe Thunderstorm Warning	LZK	Johnson, Logan, Montgomery, Polk, Scott, Yell	43 min
Sep 7, 6:37 PM CDT	Severe Thunderstorm Warning	LZK	Conway, Pope, Van Buren	38 min
Sep 7, 6:37 PM CDT	Severe Thunderstorm Warning	LZK	Baxter, Boone, Johnson, Logan, Marion, Newton and 4 more	38 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2012 Every severe thunderstorm warning 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.