Alert archive / Texas / Flash Flood Warnings in 2020

Flash Flood Warning 17, NWS Fort Worth, TX

June 21, 2020Cooke County, Montague County, Texas

NWS Fort Worth, TX issued this flash flood warning at Jun 21, 2020, 7:59 AM CDT for Cooke County, Montague County, Texas. It was in force for 3 hr. 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, 7:59 AM CDT (12:59 UTC)
Expired: Jun 21, 2020, 11:00 AM CDT
In force: 3 hr
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon
Flood severity: None

Counties Cooke County, TX, Montague County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 122 km from the middle of the area, began a volume at 13:02 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 12:00Z, 1.0 hours before the alert went out and 93 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: 1688 J/kg
Mixed-layer CIN: -153 J/kg
Mixed-layer LCL: 1058 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Jun 20, 6:17 PM CDT, 13 hours 42 minutes earlier.

Area forecast discussion, Jun 20, 6:17 PM CDT, 13 hours 42 minutes before

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Hazardous weather outlook, Jun 20, 6:25 PM CDT, 13 hours 34 minutes before

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<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.
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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, 6:04 AM CDT	Severe Thunderstorm Warning	FWD	Montague	56 min
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, 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

Flash Flood Warnings in Texas, 2020 Every flash flood 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.