Alert archive / Texas / Areal Flood Warnings in 2021

Areal Flood Warning 29, NWS Houston/Galveston, TX

September 14, 2021Brazoria County, Galveston County, Harris County, Texas

NWS Houston/Galveston, TX issued this areal flood warning at Sep 14, 2021, 8:11 AM CDT for Brazoria County, Galveston County, Harris 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: Sep 14, 2021, 8:11 AM CDT (13:11 UTC)
Expired: Sep 14, 2021, 11:15 AM CDT
In force: 3 hr
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon
Flood severity: None

Counties Brazoria County, TX, Galveston County, TX, Harris County, TX

The radar

The Houston radar (KHGX), 13 km from the middle of the area, began a volume at 13:13 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

Corpus Christi, TX (KCRP), launched 12:00Z, 1.2 hours before the alert went out and 282 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 762 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: -11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Houston/Galveston, TX wrote its last area forecast discussion before this areal flood warning went out at Sep 14, 6:42 AM CDT, 1 hour 29 minutes earlier.

Area forecast discussion, Sep 14, 6:42 AM CDT, 1 hour 29 minutes before

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In the hours before

Local storm report, Sep 14, 2:43 AM CDT, 5 hours 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
243 AM CDT TUE SEP 14 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0237 AM     STORM SURGE      2 S MORGAN'S POINT      29.65N 95.01W
09/14/2021                   HARRIS             TX   PUBLIC

            WATER IN THE PARKING LOT OF SYLVIAN BEACH
            PARK DUE TO STORM SURGE.

&&

CB

Local storm report, Sep 14, 7:36 AM CDT, 35 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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    </section>
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</body>
</html>

The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 13, 7:32 PM CDT	Flash Flood Warning	HGX	Brazoria, Jackson, Matagorda	3 hr
Sep 13, 9:46 PM CDT	Flash Flood Warning	HGX	Brazoria, Galveston, Matagorda	4 hr
Sep 13, 10:06 PM CDT	Hurricane Warning	HGX	Brazoria, Jackson, Matagorda	6 hr
Sep 13, 10:31 PM CDT	Flash Flood Warning	HGX	Matagorda	3 hr
Sep 14, 1:43 AM CDT	Flash Flood Warning	HGX	Brazoria, Galveston, Harris, Matagorda	4 hr
Sep 14, 3:33 AM CDT	Flash Flood Warning	HGX	Brazoria, Chambers, Galveston, Harris	4 hr
Sep 14, 3:57 AM CDT	Small Craft Advisory	HGX		18 hr
Sep 14, 4:04 AM CDT	Coastal Flood Advisory	HGX	Brazoria, Chambers, Galveston, Harris, Matagorda	14 hr
Sep 14, 4:42 AM CDT	River Flood Warning	HGX	Galveston, Harris	28 hr
Sep 14, 5:29 AM CDT	River Flood Warning	HGX	Galveston, Harris	21 days
Sep 14, 5:31 AM CDT	River Flood Warning	HGX	Galveston, Harris	21 days
Sep 14, 5:45 AM CDT	Flash Flood Warning	HGX	Brazoria, Chambers, Galveston, Harris	3 hr

Nearby

Areal Flood Warnings in Texas, 2021 Every areal flood warning 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.