Alert archive / Arizona / Areal Flood Advisories in 2021

Areal Flood Advisory 91, NWS Tucson, AZ

July 29, 2021Graham County, Arizona

NWS Tucson, AZ issued this areal flood advisory at Jul 29, 2021, 4:54 PM MST for Graham County, Arizona. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued: Jul 29, 2021, 4:54 PM MST (23:54 UTC)
Expired: Jul 29, 2021, 7:00 PM MST
In force: 2 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon

County Graham County, AZ

The radar

The Tucson radar (KEMX), 135 km from the middle of the area, began a volume at 23:54 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

Phoenix, AZ (KPSR), launched 12:00Z, 11.9 hours before the alert went out and 202 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: 371 J/kg
Mixed-layer CIN: -231 J/kg
Mixed-layer LCL: 2650 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 5 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 Tucson, AZ wrote its last area forecast discussion before this areal flood advisory went out at Jul 29, 3:04 PM MST, 1 hour 50 minutes earlier.

Area forecast discussion, Jul 29, 3:04 PM MST, 1 hour 50 minutes before

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In the hours before

Special weather statement, Jul 29, 2:08 PM MST, 2 hours 46 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
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      <p id="message2">
        Please try again in a few minutes.
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Special weather statement, Jul 29, 2:44 PM MST, 2 hours 10 minutes before

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<html lang="en">
<head>
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<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>
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Special weather statement, Jul 29, 3:10 PM MST, 1 hour 44 minutes before

<!doctype html>
<html lang="en">
<head>
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  <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>
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Special weather statement, Jul 29, 4:54 PM MST, 0 minutes before

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

The office that day

Everything else NWS Tucson, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 28, 8:12 PM MST	Areal Flood Advisory	TWC	Cochise	63 min
Jul 29, 1:20 PM MST	Severe Thunderstorm Warning	TWC	Pima	40 min
Jul 29, 1:55 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 29, 2:06 PM MST	Flash Flood Watch	TWC	Pima, Pinal	39 hr
Jul 29, 2:08 PM MST	Special Weather Statement	TWC		37 min
Jul 29, 2:42 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	2 hr
Jul 29, 2:44 PM MST	Special Weather Statement	TWC	Cochise	61 min
Jul 29, 3:03 PM MST	Areal Flood Advisory	TWC	Cochise	117 min
Jul 29, 3:10 PM MST	Special Weather Statement	TWC	Graham	35 min
Jul 29, 4:54 PM MST	Special Weather Statement	TWC		36 min

Nearby

Areal Flood Advisories in Arizona, 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.