Alert archive / Texas / Areal Flood Advisories in 2021

Areal Flood Advisory 45, NWS Austin/San Antonio, TX

May 16, 2021Frio County, Zavala County, Texas

NWS Austin/San Antonio, TX issued this areal flood advisory at May 16, 2021, 5:39 AM CDT for Frio County, Zavala County, Texas. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: May 16, 2021, 5:39 AM CDT (10:39 UTC)
Expired: May 16, 2021, 8:45 AM CDT
In force: 3 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

Counties Frio County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 94 km from the middle of the area, began a volume at 10:41 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

Del Rio, TX (KDRT), launched 00:00Z, 10.7 hours before the alert went out and 148 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: 1227 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 858 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 149 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Austin/San Antonio, TX wrote its last area forecast discussion before this areal flood advisory went out at May 16, 4:19 AM CDT, 1 hour 20 minutes earlier.

Area forecast discussion, May 16, 4:19 AM CDT, 1 hour 20 minutes before

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Hazardous weather outlook, May 16, 3:58 AM CDT, 1 hour 41 minutes before

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</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.
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        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 Austin/San Antonio, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 15, 8:53 PM CDT	Special Weather Statement	EWX	Val Verde	37 min
May 15, 9:01 PM CDT	Severe Thunderstorm Warning	EWX	Val Verde	17 min
May 15, 9:22 PM CDT	Severe Thunderstorm Warning	EWX	Val Verde	38 min
May 16, 8:27 AM CDT	Areal Flood Advisory	EWX	Karnes	3 hr
May 16, 11:09 AM CDT	Areal Flood Advisory	EWX	Hays, Travis	3 hr

Nearby

Areal Flood Advisories in Texas, 2021 Every areal flood advisory in 2021

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.