Alert archive / Arizona / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 45, NWS Phoenix, AZ

September 4, 2009Gila County, Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Sep 4, 2009, 3:24 PM MST for Gila County, Maricopa County, Arizona. It was in force for 24 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: Sep 4, 2009, 3:24 PM MST (22:24 UTC)
Expired: Sep 4, 2009, 3:48 PM MST
In force: 24 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon

Counties Gila County, AZ, Maricopa County, AZ

The nearest sounding before it

Phoenix, AZ (KPSR), launched 12:00Z, 10.4 hours before the alert went out and 34 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: 622 J/kg
Mixed-layer CIN: -298 J/kg
Mixed-layer LCL: 1529 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Phoenix, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 4, 2:45 PM MST, 39 minutes earlier.

Area forecast discussion, Sep 4, 2:45 PM MST, 39 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>

Hazardous weather outlook, Sep 4, 5:40 AM MST, 9 hours 44 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>

In the hours before

Special weather statement, Sep 4, 3:16 PM MST, 8 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 Phoenix, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 3, 5:38 PM MST	Areal Flood Advisory	PSR	Pinal	112 min
Sep 3, 6:20 PM MST	Special Weather Statement	PSR		40 min
Sep 3, 6:24 PM MST	Special Weather Statement	PSR	Pinal	51 min
Sep 3, 6:37 PM MST	Dust Storm Warning	PSR		68 min
Sep 3, 7:00 PM MST	Areal Flood Advisory	PSR	Maricopa	105 min
Sep 3, 8:07 PM MST	Special Weather Statement	PSR		38 min
Sep 3, 8:28 PM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	2 hr
Sep 3, 9:11 PM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	109 min
Sep 4, 3:16 PM MST	Special Weather Statement	PSR	Gila	44 min
Sep 4, 4:01 PM MST	Areal Flood Advisory	PSR	Gila	94 min
Sep 4, 4:17 PM MST	Flash Flood Warning	PSR	Gila	2 hr

Nearby

Severe Thunderstorm Warnings in Arizona, 2009 Every severe thunderstorm warning in 2009

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.