Alert archive / Indiana / Areal Flood Advisories in 2021

Areal Flood Advisory 3, NWS Indianapolis, IN

March 18, 202120 counties in Indiana

NWS Indianapolis, IN issued this areal flood advisory at Mar 18, 2021, 4:37 PM EDT for 20 counties in Indiana. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Mar 18, 2021, 4:37 PM EDT (20:37 UTC)
Expired: Mar 18, 2021, 10:23 PM EDT
In force: 6 hr
Issued by: NWS Indianapolis, IN
Area: Storm-based polygon

Counties Boone County, IN, Carroll County, IN, Clinton County, IN, Delaware County, IN, Fountain County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Madison County, IN, Marion County, IN, Montgomery County, IN, Parke County, IN, Putnam County, IN, Randolph County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Warren County, IN

The radar

The Indianapolis radar (KIND), 44 km from the middle of the area, began a volume at 20:38 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

Lincoln, IL (KILX), launched 12:00Z, 8.6 hours before the alert went out and 189 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: 6 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 465 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 308 m²/s²
0-3 km storm-relative helicity: 337 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 Indianapolis, IN wrote its last area forecast discussion before this areal flood advisory went out at Mar 18, 3:28 PM EDT, 1 hour 9 minutes earlier.

Area forecast discussion, Mar 18, 3:28 PM EDT, 1 hour 9 minutes before

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Hazardous weather outlook, Mar 18, 4:03 PM EDT, 34 minutes before

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In the hours before

Local storm report, Mar 18, 1:25 PM EDT, 3 hours 12 minutes before

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Local storm report, Mar 18, 1:27 PM EDT, 3 hours 10 minutes before

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      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Local storm report, Mar 18, 1:56 PM EDT, 2 hours 41 minutes before

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      <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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Local storm report, Mar 18, 1:59 PM EDT, 2 hours 38 minutes before

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      <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>
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Local storm report, Mar 18, 2:30 PM EDT, 2 hours 7 minutes before

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<head>
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</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>
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</body>
</html>

Local storm report, Mar 18, 2:37 PM EDT, 2 hours before

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<head>
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  <title>Service Notice</title>
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</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 Indianapolis, IN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 18, 12:40 PM EDT	Areal Flood Advisory	IND	Boone, Carroll, Clinton, Delaware, Hamilton, Howard and 5 more	3 hr
Mar 18, 4:57 PM EDT	River Flood Warning	IND	Marion	14 hr
Mar 18, 4:57 PM EDT	River Flood Warning	IND	Delaware, Randolph	37 hr
Mar 18, 4:57 PM EDT	River Flood Warning	IND	Johnson	38 hr
Mar 18, 5:31 PM EDT	River Flood Warning	IND	Boone, Marion	11 hr

Nearby

Areal Flood Advisories in Indiana, 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.