Alert archive / Texas / Flash Flood Warnings in 2023

Flash Flood Warning 12, NWS Houston/Galveston, TX

May 16, 2023Galveston County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at May 16, 2023, 3:27 PM CDT for Galveston County, Texas. It was in force for 48 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
May 16, 2023, 3:27 PM CDT (20:27 UTC)
Expired
May 16, 2023, 4:15 PM CDT
In force
48 min
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Flood severity
None

County Galveston County, TX

The radar

The Houston radar (KHGX), 32 km from the middle of the area, began a volume at 20:26 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, 8.5 hours before the alert went out and 180 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-pSkew-T log-p diagram, Lake Charles Mun, LA at 12:00Z on 2023-05-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 260 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 12:00Z on 2023-05-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -35 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
260 J/kg
Mixed-layer CIN
-152 J/kg
Mixed-layer LCL
1384 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
-35 m²/s²
0-3 km storm-relative helicity
-22 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 flash 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 flash flood warning went out at May 16, 12:42 PM CDT, 2 hours 45 minutes earlier.

Area forecast discussion, May 16, 12:42 PM CDT, 2 hours 45 minutes before
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In the hours before

Special weather statement, May 16, 1:30 PM CDT, 1 hour 57 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>
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</body>
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Special weather statement, May 16, 3:01 PM CDT, 26 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>

The office that day

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

IssuedProductOfficeCountiesLasted
May 15, 10:34 PM CDTAreal Flood WarningHGXMontgomery10 hr
May 16, 1:24 PM CDTAreal Flood AdvisoryHGXMatagorda97 min
May 16, 1:30 PM CDTSpecial Weather StatementHGXMatagorda30 min
May 16, 2:49 PM CDTAreal Flood AdvisoryHGXGalveston, Harris116 min
May 16, 3:01 PM CDTSpecial Weather StatementHGXGalveston29 min
May 16, 3:08 PM CDTSevere Thunderstorm WarningHGXGalveston, Harris37 min
May 16, 3:46 PM CDTSpecial Marine WarningHGX29 min
May 16, 4:14 PM CDTSpecial Weather StatementHGXHarris31 min
May 16, 4:27 PM CDTSpecial Weather StatementHGXAustin33 min
May 16, 4:31 PM CDTSpecial Marine WarningHGX36 min
May 16, 4:40 PM CDTAreal Flood AdvisoryHGXHarris2 hr
May 16, 4:56 PM CDTSpecial Weather StatementHGXHarris34 min
May 16, 5:02 PM CDTSpecial Weather StatementHGXFort Bend28 min
May 16, 5:17 PM CDTRiver Flood WarningHGXBrazoria5 days
May 16, 5:38 PM CDTAreal Flood AdvisoryHGXHarris112 min
May 16, 5:50 PM CDTAreal Flood AdvisoryHGXAustin, Fort Bend, Harris, Waller, Wharton115 min
May 16, 6:06 PM CDTFlash Flood WarningHGXHarris84 min
May 16, 6:07 PM CDTSpecial Weather StatementHGXHarris38 min
May 16, 6:32 PM CDTSpecial Weather StatementHGXColorado58 min

Nearby

Flash Flood Warnings in Texas, 2023Every flash flood warning in 2023

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.