Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 153, NWS Shreveport, LA

May 9, 2009Red River County, Texas

NWS Shreveport, LA issued this severe thunderstorm warning at May 9, 2009, 2:33 AM CDT for Red River County, Texas. 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
May 9, 2009, 2:33 AM CDT (07:33 UTC)
Expired
May 9, 2009, 3:15 AM CDT
In force
42 min
Issued by
NWS Shreveport, LA
Area
Storm-based polygon

County Red River County, TX

The radar

The Shreveport radar (KSHV), 172 km from the middle of the area, began a volume at 07:35 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.

IssuedProductOfficeLasted
May 8, 11:48 PM CDTTornado WatchSPC5 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 7.6 hours before the alert went out and 226 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-pSkew-T log-p diagram, Fort Worth, TX at 00:00Z on 2009-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4727 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 00:00Z on 2009-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 139 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
4727 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
993 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
139 m²/s²
0-3 km storm-relative helicity
189 m²/s²
Significant tornado parameter
3.5
Supercell composite
16.7

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 Shreveport, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at May 9, 1:53 AM CDT, 40 minutes earlier.

Area forecast discussion, May 9, 1:53 AM CDT, 40 minutes before
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Hazardous weather outlook, May 8, 8:00 PM CDT, 6 hours 33 minutes before
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  <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.
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In the hours before

Special weather statement, May 9, 1:52 AM CDT, 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>

The office that day

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

IssuedProductOfficeCountiesLasted
May 9, 8:44 AM CDTRiver Flood WarningSHVGregg, Harrison, Panola, Rusk5 days
May 9, 12:51 PM CDTSevere Thunderstorm WarningSHVRed River24 min
May 9, 1:15 PM CDTSevere Thunderstorm WarningSHVRed River45 min
May 9, 1:43 PM CDTSevere Thunderstorm WarningSHVBowie62 min
May 9, 2:05 PM CDTSevere Thunderstorm WarningSHVBowie55 min
May 9, 2:09 PM CDTTornado WarningSHVBowie66 min
May 9, 2:24 PM CDTSevere Thunderstorm WarningSHVBowie, Cass, Morris66 min
May 9, 3:24 PM CDTFlash Flood WarningSHVBowie, Red River3 hr
May 9, 4:06 PM CDTFlash Flood WatchSHVBowie, Camp, Cass, Franklin, Marion, Morris and 4 more3 days
May 9, 4:50 PM CDTSevere Thunderstorm WarningSHVBowie, Cass55 min
May 9, 6:19 PM CDTFlash Flood WarningSHVBowie, Red River4 hr
May 9, 4:05 PM CDTSevere Thunderstorm WarningSHVUnion55 min
May 9, 1:31 PM CDTSevere Thunderstorm WarningSHVSevier59 min
May 9, 1:34 PM CDTSevere Thunderstorm WarningSHVLittle River, Sevier56 min
May 9, 3:03 PM CDTSevere Thunderstorm WarningSHVColumbia, Hempstead, Lafayette, Miller, Nevada42 min
May 9, 4:07 PM CDTFlash Flood WarningSHVHempstead3 hr
May 9, 6:56 PM CDTFlash Flood WarningSHVHempstead, Nevada4 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2009Every 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.