Alert archive / Missouri / Areal Flood Advisories in 2021

Areal Flood Advisory 16, NWS St. Louis, MO

June 29, 2021Callaway County, Missouri

NWS St. Louis, MO issued this areal flood advisory at Jun 29, 2021, 4:54 PM CDT for Callaway County, Missouri. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Jun 29, 2021, 4:54 PM CDT (21:54 UTC)
Expired: Jun 29, 2021, 7:45 PM CDT
In force: 3 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon

County Callaway County, MO

The radar

The St Louis radar (KLSX), 109 km from the middle of the area, began a volume at 21:55 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

Springfield, MO (KSGF), launched 12:00Z, 9.9 hours before the alert went out and 271 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: 736 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 905 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 44 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 advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS St. Louis, MO wrote its last area forecast discussion before this areal flood advisory went out at Jun 29, 2:54 PM CDT, 2 hours earlier.

Area forecast discussion, Jun 29, 2:54 PM CDT, 2 hours before

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Hazardous weather outlook, Jun 29, 2:57 PM CDT, 1 hour 57 minutes before

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In the hours before

Local storm report, Jun 29, 4:53 PM CDT, 1 minute 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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The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 29, 3:13 AM CDT	River Flood Warning	LSX	Lincoln	14 hr
Jun 29, 8:13 AM CDT	River Flood Warning	LSX	Cole	14 hr
Jun 29, 2:54 PM CDT	Areal Flood Advisory	LSX	Monroe	4 hr
Jun 29, 6:18 PM CDT	River Flood Warning	LSX	Lewis	15 hr
Jun 29, 10:54 AM CDT	River Flood Warning	LSX	Pike, Scott	25 days

Nearby

Areal Flood Advisories in Missouri, 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.