Alert archive / Arizona / Flash Flood Warnings in 2022

Flash Flood Warning 20, NWS Phoenix, AZ

July 16, 2022Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 16, 2022, 9:50 PM MST for Maricopa County, Arizona. It was in force for 3 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: Jul 16, 2022, 9:50 PM MST (04:50 UTC)
Expired: Jul 17, 2022, 12:45 AM MST
In force: 3 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 77 km from the middle of the area, began a volume at 04:50 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

Tuscon, AZ (KTUS), launched 00:00Z, 4.8 hours before the alert went out and 198 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: 516 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 3294 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: -91 m²/s²
0-3 km storm-relative helicity: 12 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 flash flood 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 flash flood warning went out at Jul 16, 5:28 PM MST, 4 hours 22 minutes earlier.

Area forecast discussion, Jul 16, 5:28 PM MST, 4 hours 22 minutes before

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In the hours before

Local storm report, Jul 16, 8:26 PM MST, 1 hour 24 minutes before

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Local storm report, Jul 16, 8:27 PM MST, 1 hour 23 minutes before

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Local storm report, Jul 16, 8:30 PM MST, 1 hour 20 minutes before

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Local storm report, Jul 16, 8:31 PM MST, 1 hour 19 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
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Special weather statement, Jul 16, 9:09 PM MST, 41 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        Please try again in a few minutes.
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      <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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Special weather statement, Jul 16, 9:13 PM MST, 37 minutes before

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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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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 5:27 PM MST	Special Weather Statement	PSR		48 min
Jul 16, 5:36 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	24 min
Jul 16, 5:55 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	35 min
Jul 16, 6:05 PM MST	Special Weather Statement	PSR		40 min
Jul 16, 6:20 PM MST	Dust Storm Advisory	PSR	Maricopa, Pinal	40 min
Jul 16, 7:45 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	30 min
Jul 16, 7:47 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	43 min
Jul 16, 8:01 PM MST	Special Weather Statement	PSR	Maricopa	44 min
Jul 16, 8:23 PM MST	Dust Storm Advisory	PSR	Maricopa	52 min
Jul 16, 8:32 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	43 min
Jul 16, 9:09 PM MST	Special Weather Statement	PSR		51 min
Jul 16, 9:13 PM MST	Special Weather Statement	PSR	Maricopa	47 min
Jul 16, 10:01 PM MST	Special Weather Statement	PSR	La Paz	44 min
Jul 16, 10:43 PM MST	Special Weather Statement	PSR	La Paz	47 min

Nearby

Flash Flood Warnings in Arizona, 2022 Every flash flood warning in 2022

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.