Alert archive / Texas / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 36, NWS Fort Worth, TX

April 11, 2020Stephens County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Apr 11, 2020, 7:25 PM CDT for Stephens County, Texas. It was in force for 65 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 11, 2020, 7:25 PM CDT (00:25 UTC)
Expired
Apr 11, 2020, 8:30 PM CDT
In force
65 min
Issued by
NWS Fort Worth, TX
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Stephens County, TX

The radar

The Dyess AFB radar (KDYX), 45 km from the middle of the area, began a volume at 00:25 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

Fort Worth, TX (KFWD), launched 00:00Z, 0.4 hours before the alert went out and 145 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 2020-04-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 509 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 2020-04-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 323 square meters per square second.1939587897117Sfc1 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
509 J/kg
Mixed-layer CIN
-124 J/kg
Mixed-layer LCL
678 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
323 m²/s²
0-3 km storm-relative helicity
406 m²/s²
Significant tornado parameter
0.5
Supercell composite
10.7

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 Fort Worth, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 11, 3:57 PM CDT, 3 hours 28 minutes earlier.

Area forecast discussion, Apr 11, 3:57 PM 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>
Hazardous weather outlook, Apr 11, 6:13 PM CDT, 1 hour 12 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 Fort Worth, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 12, 1:55 AM CDTWind AdvisoryFWDBell, Bosque, Collin, Comanche, Cooke, Coryell and 32 more23 hr
Apr 12, 3:20 AM CDTSpecial Weather StatementFWDLampasas40 min
Apr 12, 3:36 AM CDTSevere Thunderstorm WarningFWDLampasas42 min
Apr 12, 3:41 AM CDTSpecial Weather StatementFWDCoryell34 min
Apr 12, 4:26 AM CDTSpecial Weather StatementFWDMcLennan34 min
Apr 12, 4:30 AM CDTSpecial Weather StatementFWDCoryell30 min
Apr 12, 4:51 AM CDTTornado WarningFWDHill, Limestone, McLennan39 min
Apr 12, 5:09 AM CDTSpecial Weather StatementFWDFalls, McLennan36 min
Apr 12, 5:20 AM CDTSpecial Weather StatementFWDBell25 min
Apr 12, 5:35 AM CDTSpecial Weather StatementFWDNavarro25 min
Apr 12, 5:39 AM CDTSpecial Weather StatementFWDLimestone36 min
Apr 12, 5:43 AM CDTSevere Thunderstorm WarningFWDFalls, Freestone, Hill, Limestone, McLennan, Navarro62 min
Apr 12, 5:45 AM CDTTornado WarningFWDFreestone, Limestone45 min
Apr 12, 6:01 AM CDTSpecial Weather StatementFWDNavarro29 min
Apr 12, 6:14 AM CDTTornado WarningFWDFreestone34 min
Apr 12, 6:30 AM CDTAreal Flood AdvisoryFWDNavarro3 hr
Apr 12, 6:31 AM CDTSpecial Weather StatementFWDHenderson29 min
Apr 12, 6:36 AM CDTSevere Thunderstorm WarningFWDHenderson39 min
Apr 12, 6:40 AM CDTAreal Flood AdvisoryFWDFalls, Limestone3 hr
Apr 12, 6:43 AM CDTSevere Thunderstorm WarningFWDAnderson, Henderson58 min
Apr 12, 7:01 AM CDTSpecial Weather StatementFWDRobertson59 min
Apr 12, 7:11 AM CDTSpecial Weather StatementFWDMilam49 min
Apr 12, 7:16 AM CDTSevere Thunderstorm WarningFWDAnderson, Freestone, Leon45 min
Apr 12, 7:45 AM CDTSpecial Weather StatementFWDLeon30 min
Apr 12, 8:00 AM CDTSpecial Weather StatementFWDLeon, Robertson45 min
Apr 12, 2:16 PM CDTRiver Flood WarningFWDHenderson, Navarro4 days
Apr 12, 2:16 PM CDTRiver Flood WarningFWDLeon, Robertson4 days
Apr 12, 3:17 PM CDTSevere Thunderstorm WarningFWDFannin, Lamar58 min
Apr 12, 4:10 PM CDTSevere Thunderstorm WarningFWDFannin, Lamar65 min
Apr 12, 4:27 PM CDTSpecial Weather StatementFWDDallas33 min
Apr 12, 5:02 PM CDTSpecial Weather StatementFWDDallas28 min
Apr 12, 5:28 PM CDTSpecial Weather StatementFWDKaufman32 min
Apr 12, 6:11 PM CDTSevere Thunderstorm WarningFWDRains, Van Zandt34 min

Nearby

Severe Thunderstorm Warnings in Texas, 2020Every severe thunderstorm warning in 2020

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.