Alert archive / Alabama / Flash Flood Warnings in 2023

Flash Flood Warning 23, NWS Huntsville, AL

August 4, 2023Cullman County, Alabama

NWS Huntsville, AL issued this flash flood warning at Aug 4, 2023, 4:33 AM CDT for Cullman County, Alabama. It was in force for 4 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: Aug 4, 2023, 4:33 AM CDT (09:33 UTC)
Expired: Aug 4, 2023, 8:19 AM CDT
In force: 4 hr
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Flood severity: None

County Cullman County, AL

The radar

The Birmingham radar (KBMX), 107 km from the middle of the area, began a volume at 09:31 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

Birmingham, AL (KBMX), launched 00:00Z, 9.6 hours before the alert went out and 106 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: 109 J/kg
Mixed-layer CIN: -268 J/kg
Mixed-layer LCL: 1450 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 131 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Huntsville, AL wrote its last area forecast discussion before this flash flood warning went out at Aug 4, 2:25 AM CDT, 2 hours 8 minutes earlier.

Area forecast discussion, Aug 4, 2:25 AM CDT, 2 hours 8 minutes before

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In the hours before

Special weather statement, Aug 4, 3:15 AM CDT, 1 hour 18 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.
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The office that day

Everything else NWS Huntsville, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 4, 3:15 AM CDT	Special Weather Statement	HUN	Colbert	45 min
Aug 4, 3:48 AM CDT	Flash Flood Warning	HUN	Morgan	3 hr
Aug 4, 4:26 AM CDT	Flash Flood Warning	HUN	Lauderdale, Limestone	2 hr
Aug 4, 6:31 AM CDT	Areal Flood Warning	HUN	Lauderdale, Limestone, Morgan	3 hr
Aug 4, 8:19 AM CDT	Areal Flood Warning	HUN	Cullman	101 min

Nearby

Flash Flood Warnings in Alabama, 2023 Every 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.