Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 64, NWS San Angelo, TX

April 27, 2009Sutton County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Apr 27, 2009, 10:27 AM CDT for Sutton County, Texas. It was in force for 48 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 27, 2009, 10:27 AM CDT (15:27 UTC)
Expired: Apr 27, 2009, 11:15 AM CDT
In force: 48 min
Issued by: NWS San Angelo, TX
Area: Storm-based polygon

County Sutton County, TX

The radar

The San Angelo radar (KSJT), 97 km from the middle of the area, began a volume at 15:27 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

Del Rio, TX (KDRT), launched 12:00Z, 3.5 hours before the alert went out and 129 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: 2567 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 669 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 160 m²/s²
0-3 km storm-relative helicity: 224 m²/s²
Significant tornado parameter: 2.8
Supercell composite: 10.9

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 San Angelo, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 27, 10:19 AM CDT, 8 minutes earlier.

Area forecast discussion, Apr 27, 10:19 AM CDT, 8 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 27, 5:51 AM CDT, 4 hours 36 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 27, 5:29 AM CDT, 4 hours 58 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>

Local storm report, Apr 27, 6:49 AM CDT, 3 hours 38 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 27, 6:59 AM CDT, 3 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>

Special weather statement, Apr 27, 7:50 AM CDT, 2 hours 37 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>

Local storm report, Apr 27, 8:49 AM CDT, 1 hour 38 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 27, 9:52 AM CDT, 35 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 San Angelo, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 26, 7:06 PM CDT	Tornado Warning	SJT	Crockett, Sutton	39 min
Apr 26, 7:15 PM CDT	Severe Thunderstorm Warning	SJT	Crockett, Schleicher, Sutton	60 min
Apr 26, 7:37 PM CDT	Severe Thunderstorm Warning	SJT	Crockett, Sutton	38 min
Apr 26, 7:49 PM CDT	Tornado Warning	SJT	Crockett, Sutton	41 min
Apr 26, 7:49 PM CDT	Tornado Warning	SJT	Sutton	41 min
Apr 26, 8:13 PM CDT	Severe Thunderstorm Warning	SJT	Crockett, Schleicher, Sutton	47 min
Apr 26, 8:30 PM CDT	Tornado Warning	SJT	Sutton	45 min
Apr 26, 8:49 PM CDT	Severe Thunderstorm Warning	SJT	Kimble, Menard, Schleicher, Sutton	56 min
Apr 26, 9:12 PM CDT	Tornado Warning	SJT	Kimble, Sutton	48 min
Apr 26, 9:18 PM CDT	Severe Thunderstorm Warning	SJT	Crockett	57 min
Apr 26, 9:39 PM CDT	Severe Thunderstorm Warning	SJT	Kimble, Mason, Sutton	51 min
Apr 26, 9:43 PM CDT	Severe Thunderstorm Warning	SJT	Crockett	32 min
Apr 26, 9:58 PM CDT	Tornado Warning	SJT	Kimble, Sutton	32 min
Apr 26, 10:28 PM CDT	Severe Thunderstorm Warning	SJT	Kimble, Sutton	47 min
Apr 26, 10:34 PM CDT	Tornado Warning	SJT	Kimble	41 min
Apr 26, 11:17 PM CDT	Severe Thunderstorm Warning	SJT	Kimble, Mason	58 min
Apr 26, 11:27 PM CDT	Flash Flood Warning	SJT	Kimble	4 hr
Apr 27, 12:14 AM CDT	Severe Thunderstorm Warning	SJT	Irion, Sterling, Tom Green	46 min
Apr 27, 12:15 AM CDT	Severe Thunderstorm Warning	SJT	Kimble, Mason	60 min
Apr 27, 12:46 AM CDT	Severe Thunderstorm Warning	SJT	Tom Green	44 min
Apr 27, 12:58 AM CDT	Areal Flood Advisory	SJT	Tom Green	3 hr
Apr 27, 1:04 AM CDT	Severe Thunderstorm Warning	SJT	Irion, Sterling, Tom Green	41 min
Apr 27, 1:27 AM CDT	Severe Thunderstorm Warning	SJT	Tom Green	48 min
Apr 27, 1:51 AM CDT	Severe Thunderstorm Warning	SJT	Coke, Sterling, Tom Green	39 min
Apr 27, 2:29 AM CDT	Severe Thunderstorm Warning	SJT	Coke, Sterling, Tom Green	46 min
Apr 27, 2:42 AM CDT	Flash Flood Warning	SJT	Coke, Sterling, Tom Green	4 hr
Apr 27, 3:32 AM CDT	Severe Thunderstorm Warning	SJT	McCulloch, San Saba	43 min
Apr 27, 3:51 AM CDT	Areal Flood Advisory	SJT	Concho, McCulloch	4 hr
Apr 27, 4:26 AM CDT	Flash Flood Watch	SJT	Brown, Coke, Coleman, Concho, Crockett, Irion and 10 more	9 hr
Apr 27, 4:46 AM CDT	Flash Flood Warning	SJT	Concho, McCulloch, San Saba	6 hr
Apr 27, 5:13 AM CDT	Flash Flood Warning	SJT	Coke, Irion, Sterling, Tom Green	4 hr
Apr 27, 6:12 AM CDT	Severe Thunderstorm Warning	SJT	Crockett, Irion, Schleicher, Sterling, Tom Green	48 min
Apr 27, 6:44 AM CDT	Severe Thunderstorm Warning	SJT	McCulloch, San Saba	26 min
Apr 27, 6:51 AM CDT	Severe Thunderstorm Warning	SJT	San Saba	24 min
Apr 27, 6:55 AM CDT	Areal Flood Advisory	SJT	Crockett, Irion, Schleicher, Tom Green	6 hr
Apr 27, 7:28 AM CDT	Severe Thunderstorm Warning	SJT	Schleicher, Sutton	47 min
Apr 27, 8:07 AM CDT	Areal Flood Advisory	SJT	McCulloch, Mason, Menard, San Saba	6 hr
Apr 27, 8:54 AM CDT	Flash Flood Warning	SJT	Crockett, Schleicher, Sutton	6 hr
Apr 27, 9:43 AM CDT	Flash Flood Warning	SJT	Kimble, Mason	5 hr
Apr 27, 11:05 AM CDT	Areal Flood Advisory	SJT	McCulloch, San Saba	4 hr

Nearby

Severe Thunderstorm Warnings in Texas, 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.