Alert archive / Texas / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 105, NWS Shreveport, LA

April 21, 1997Cass County, Texas

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 21, 1997, 12:48 AM CDT for Cass County, Texas. It was in force for 57 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 21, 1997, 12:48 AM CDT (05:48 UTC)
Expired: Apr 21, 1997, 1:45 AM CDT
In force: 57 min
Issued by: NWS Shreveport, LA
Area: Whole counties

County Cass County, TX

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 5.8 hours before the alert went out and 87 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: 1276 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 1596 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 Apr 20, 9:08 PM CDT, 3 hours 40 minutes earlier.

Area forecast discussion, Apr 20, 9:08 PM CDT, 3 hours 40 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
900 PM CDT SUN APR  20 1997

BROKEN LINE OF TSTMS ALONG FRONT MAY MAKE IT INTO SOUTHWEST AR AND
NORTH LA LATE...SO WILL ONLY MAKE MINOR CHANGES TO FORECAST.

IV

In the hours before

Local storm report, Apr 21, 12:11 AM CDT, 37 minutes before

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Local storm report, Apr 21, 12:12 AM CDT, 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>

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 10:52 PM CDT	Severe Thunderstorm Warning	SHV	Red River	68 min
Apr 20, 11:22 PM CDT	Severe Thunderstorm Warning	SHV	Franklin	53 min
Apr 20, 11:47 PM CDT	Severe Thunderstorm Warning	SHV	Titus	28 min
Apr 21, 12:14 AM CDT	Severe Thunderstorm Warning	SHV	Morris	31 min
Apr 21, 2:15 AM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	30 min

Nearby

Severe Thunderstorm Warnings in Texas, 1997 Every severe thunderstorm warning in 1997

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.