Alert archive / Texas / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 159, NWS Fort Worth, TX

June 21, 2020Montague County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Jun 21, 2020, 6:04 AM CDT for Montague County, Texas. It was in force for 56 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: Jun 21, 2020, 6:04 AM CDT (11:04 UTC)
Expired: Jun 21, 2020, 7:00 AM CDT
In force: 56 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Montague County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 129 km from the middle of the area, began a volume at 11:07 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.

Issued	Product	Office	Lasted
Jun 21, 1:21 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 11.1 hours before the alert went out and 102 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: 1508 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 1465 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.0

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 Jun 20, 6:17 PM CDT, 11 hours 47 minutes earlier.

Area forecast discussion, Jun 20, 6:17 PM CDT, 11 hours 47 minutes before

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Hazardous weather outlook, Jun 20, 6:25 PM CDT, 11 hours 39 minutes before

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  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
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  <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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The office that day

Everything else NWS Fort Worth, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 21, 3:47 AM CDT	Special Weather Statement	FWD	Grayson	58 min
Jun 21, 4:27 AM CDT	Special Weather Statement	FWD	Grayson	33 min
Jun 21, 4:46 AM CDT	Special Weather Statement	FWD	Montague	59 min
Jun 21, 5:42 AM CDT	Areal Flood Advisory	FWD	Montague	2 hr
Jun 21, 6:26 AM CDT	Areal Flood Advisory	FWD	Cooke	3 hr
Jun 21, 6:31 AM CDT	Special Weather Statement	FWD	Cooke	59 min
Jun 21, 7:01 AM CDT	Special Weather Statement	FWD	Denton, Montague, Wise	44 min
Jun 21, 7:21 AM CDT	Severe Thunderstorm Warning	FWD	Cooke, Denton, Wise	54 min
Jun 21, 7:42 AM CDT	Special Weather Statement	FWD	Grayson	48 min
Jun 21, 7:59 AM CDT	Flash Flood Warning	FWD	Cooke, Montague	3 hr
Jun 21, 8:04 AM CDT	Special Weather Statement	FWD	Montague	26 min
Jun 21, 8:18 AM CDT	Special Weather Statement	FWD	Denton	57 min
Jun 21, 8:30 AM CDT	Special Weather Statement	FWD	Grayson	45 min
Jun 21, 8:43 AM CDT	Special Weather Statement	FWD	Jack, Wise	47 min
Jun 21, 10:58 AM CDT	Areal Flood Advisory	FWD	Cooke, Montague	3 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2020 Every 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.