Alert archive / Texas / Areal Flood Warnings in 2021

Areal Flood Warning 12, NWS Houston/Galveston, TX

May 19, 2021Jackson County, Matagorda County, Texas

NWS Houston/Galveston, TX issued this areal flood warning at May 19, 2021, 1:13 PM CDT for Jackson County, Matagorda County, Texas. It was in force for 6 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: May 19, 2021, 1:13 PM CDT (18:13 UTC)
Expired: May 19, 2021, 7:30 PM CDT
In force: 6 hr
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon
Flood severity: None

Counties Jackson County, TX, Matagorda County, TX

The radar

The Houston radar (KHGX), 135 km from the middle of the area, began a volume at 18:13 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 6.2 hours before the alert went out and 330 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: 1270 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: -339 m²/s²
0-3 km storm-relative helicity: -173 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 May 19, 12:32 PM CDT, 41 minutes earlier.

Area forecast discussion, May 19, 12:32 PM CDT, 41 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>

In the hours before

Local storm report, May 19, 12:43 PM CDT, 30 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>

Local storm report, May 19, 12:49 PM CDT, 24 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>

Local storm report, May 19, 12:52 PM CDT, 21 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>

Local storm report, May 19, 12:57 PM CDT, 16 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>

Local storm report, May 19, 1:06 PM CDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
106 PM CDT WED MAY 19 2021

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

1228 AM     FLASH FLOOD      4 NE KATY               29.85N 95.77W
05/19/2021                   HARRIS             TX   LAW ENFORCEMENT

            HARRIS COUNTY SHERRIFF OFFICE REPORTS A
            FLOODED ROADWAY AT 12:28AM CDT NEAR PEEK
            ROAD AND STOCKDICK SCHOOL ROAD.

&&

Local storm report, May 19, 1:10 PM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
110 PM CDT WED MAY 19 2021

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

1228 AM     FLASH FLOOD      5 WSW JERSEY VILLAGE    29.85N 95.65W
05/19/2021                   HARRIS             TX   LAW ENFORCEMENT

            HARRIS COUNTY SHERRIFF OFFICE REPORTS HIGH
            WATER NEAR KIETH HARROW BLVD AND HIGHWAY 6
            AT APPROXIMATELY 12:28 AM CDT.

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 7:19 PM CDT	Special Weather Statement	HGX	Washington	41 min
May 18, 7:33 PM CDT	Tornado Warning	HGX	Colorado	27 min
May 18, 8:01 PM CDT	Special Weather Statement	HGX	Austin, Colorado	59 min
May 18, 8:21 PM CDT	Areal Flood Advisory	HGX	Austin, Colorado, Fort Bend, Washington, Wharton	114 min
May 18, 8:24 PM CDT	Tornado Warning	HGX	Austin, Colorado, Fort Bend, Waller, Wharton	36 min
May 18, 8:28 PM CDT	Special Weather Statement	HGX	Jackson	47 min
May 18, 8:40 PM CDT	Areal Flood Advisory	HGX	Austin, Brazos, Burleson, Grimes, Harris, Houston and 5 more	3 hr
May 18, 8:41 PM CDT	Severe Thunderstorm Warning	HGX	Austin, Colorado, Fort Bend, Waller, Wharton	49 min
May 18, 8:52 PM CDT	Flash Flood Warning	HGX	Austin, Burleson, Colorado, Waller, Washington, Wharton	113 min
May 18, 9:10 PM CDT	Severe Thunderstorm Warning	HGX	Fort Bend, Harris, Waller	35 min
May 18, 9:12 PM CDT	Tornado Warning	HGX	Fort Bend, Harris, Waller	33 min
May 18, 9:25 PM CDT	Areal Flood Advisory	HGX	Brazoria, Colorado, Fort Bend, Jackson, Matagorda, Wharton	3 hr
May 18, 9:25 PM CDT	Severe Thunderstorm Warning	HGX	Grimes, Harris, Montgomery, Waller	35 min
May 18, 9:28 PM CDT	Areal Flood Advisory	HGX	Austin, Brazoria, Fort Bend, Harris, Montgomery, Waller	3 hr
May 18, 9:43 PM CDT	Flash Flood Warning	HGX	Austin, Brazoria, Fort Bend, Galveston, Harris, Montgomery and 2 more	3 hr
May 18, 9:44 PM CDT	Severe Thunderstorm Warning	HGX	Harris, Montgomery	31 min
May 18, 9:44 PM CDT	Tornado Warning	HGX	Fort Bend, Harris	31 min
May 18, 9:51 PM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Fort Bend, Galveston, Harris	39 min
May 18, 10:01 PM CDT	Special Marine Warning	HGX		29 min
May 18, 10:11 PM CDT	Special Weather Statement	HGX	Liberty, Montgomery	49 min
May 18, 10:22 PM CDT	Special Marine Warning	HGX		83 min
May 18, 10:31 PM CDT	Tornado Warning	HGX	Chambers, Harris, Liberty	29 min
May 18, 10:37 PM CDT	Special Weather Statement	HGX	Brazoria, Matagorda	53 min
May 18, 10:43 PM CDT	Areal Flood Warning	HGX	Austin, Brazos, Burleson, Colorado, Grimes, Waller and 2 more	2 hr
May 18, 11:12 PM CDT	Flash Flood Warning	HGX	Brazoria, Jackson, Matagorda, Wharton	3 hr
May 18, 11:25 PM CDT	Areal Flood Advisory	HGX	Chambers, Liberty, Polk	3 hr
May 18, 11:30 PM CDT	Areal Flood Advisory	HGX	Brazoria, Galveston, Harris	3 hr
May 18, 11:42 PM CDT	Areal Flood Advisory	HGX	Montgomery, San Jacinto	3 hr
May 18, 11:43 PM CDT	Special Marine Warning	HGX		77 min
May 18, 11:55 PM CDT	Special Marine Warning	HGX		65 min
May 18, 11:57 PM CDT	River Flood Warning	HGX	Jackson, Wharton	45 hr
May 19, 12:03 AM CDT	River Flood Warning	HGX	Brazoria	21 days
May 19, 12:04 AM CDT	Special Weather Statement	HGX	Polk	41 min
May 19, 12:18 AM CDT	Areal Flood Warning	HGX	Jackson, Wharton	3 hr
May 19, 12:21 AM CDT	Flash Flood Warning	HGX	Jackson, Matagorda	3 hr
May 19, 12:25 AM CDT	Special Marine Warning	HGX		65 min
May 19, 12:33 AM CDT	Areal Flood Warning	HGX	Austin, Brazoria, Fort Bend, Galveston, Harris, Montgomery and 2 more	12 min
May 19, 12:33 AM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Matagorda	27 min
May 19, 12:38 AM CDT	River Flood Warning	HGX	Polk, San Jacinto, Trinity, Walker	32 days
May 19, 12:44 AM CDT	Special Weather Statement	HGX	Jackson	46 min
May 19, 12:56 AM CDT	Special Marine Warning	HGX		64 min
May 19, 12:58 AM CDT	Areal Flood Advisory	HGX	Brazoria, Galveston	3 hr
May 19, 12:58 AM CDT	Special Marine Warning	HGX		32 min
May 19, 1:07 AM CDT	Areal Flood Warning	HGX	Montgomery, Waller	3 hr
May 19, 1:26 AM CDT	Special Marine Warning	HGX		34 min
May 19, 1:53 AM CDT	Special Marine Warning	HGX		52 min
May 19, 2:10 AM CDT	River Flood Warning	HGX	Lavaca	43 hr
May 19, 2:10 AM CDT	River Flood Warning	HGX	Jackson	21 days
May 19, 2:10 AM CDT	River Flood Warning	HGX	Jackson, Lavaca	4 days
May 19, 2:39 AM CDT	River Flood Warning	HGX	Colorado, Jackson, Wharton	4 days
May 19, 2:40 AM CDT	River Flood Warning	HGX	Harris, Liberty, Montgomery	21 days
May 19, 2:57 AM CDT	River Flood Warning	HGX	Jackson	9 days
May 19, 2:57 AM CDT	River Flood Warning	HGX	Jackson, Wharton	68 hr
May 19, 3:12 AM CDT	Areal Flood Warning	HGX	Waller	15 hr
May 19, 3:19 AM CDT	Special Marine Warning	HGX		116 min
May 19, 3:25 AM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Colorado, Fort Bend, Jackson, Matagorda, Wharton	50 min
May 19, 3:26 AM CDT	Flash Flood Warning	HGX	Jackson, Matagorda	10 hr
May 19, 3:27 AM CDT	Small Craft Advisory	HGX		33 min
May 19, 3:38 AM CDT	Areal Flood Advisory	HGX	Brazoria, Matagorda	14 hr
May 19, 4:13 AM CDT	Areal Flood Warning	HGX	Montgomery, Waller	12 hr
May 19, 6:06 AM CDT	River Flood Warning	HGX	Polk, San Jacinto	9 hr
May 19, 9:58 AM CDT	River Flood Warning	HGX	Jackson, Lavaca	4 days
May 19, 1:15 PM CDT	Areal Flood Advisory	HGX	Jackson, Matagorda	6 hr
May 19, 4:04 PM CDT	River Flood Warning	HGX	Harris	21 days
May 19, 4:16 PM CDT	Areal Flood Warning	HGX	Montgomery, Waller	5 hr
May 19, 6:16 PM CDT	Areal Flood Warning	HGX	Waller	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.