Alert archive / California / Flash Flood Warnings in 2024

Flash Flood Warning 17, NWS Phoenix, AZ

July 15, 2024Riverside County, San Bernardino County, California

NWS Phoenix, AZ issued this flash flood warning at Jul 15, 2024, 3:55 PM PDT for Riverside County, San Bernardino County, California. 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 15, 2024, 3:55 PM PDT (22:55 UTC)
Expired: Jul 15, 2024, 6:30 PM PDT
In force: 3 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Riverside County, CA, San Bernardino County, CA

The radar

The Santa Ana Mts radar (KSOX), 152 km from the middle of the area, began a volume at 22:58 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

San Diego, CA (KNKX), launched 12:00Z, 10.9 hours before the alert went out and 195 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 957 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 61 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 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 15, 1:50 PM PDT, 2 hours 5 minutes earlier.

Area forecast discussion, Jul 15, 1:50 PM PDT, 2 hours 5 minutes before

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In the hours before

Special weather statement, Jul 15, 3:04 PM PDT, 51 minutes before

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<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.
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Special weather statement, Jul 15, 3:30 PM PDT, 25 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
Jul 14, 6:47 PM PDT	Dust Storm Warning	PSR	Maricopa, Pinal	118 min
Jul 14, 7:33 PM PDT	Severe Thunderstorm Warning	PSR	Pinal	42 min
Jul 14, 7:50 PM PDT	Dust Storm Warning	PSR	Maricopa, Pinal	85 min
Jul 14, 8:13 PM PDT	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	47 min
Jul 14, 8:35 PM PDT	Areal Flood Advisory	PSR	Pinal	3 hr
Jul 14, 8:37 PM PDT	Dust Storm Warning	PSR	Maricopa	83 min
Jul 14, 8:46 PM PDT	Dust Storm Warning	PSR	Maricopa	59 min
Jul 14, 9:09 PM PDT	Special Weather Statement	PSR	Maricopa	51 min
Jul 14, 9:21 PM PDT	Special Weather Statement	PSR		39 min
Jul 14, 9:27 PM PDT	Severe Thunderstorm Warning	PSR	Maricopa	48 min
Jul 14, 9:36 PM PDT	Severe Thunderstorm Warning	PSR	Maricopa	39 min
Jul 14, 9:41 PM PDT	Severe Thunderstorm Warning	PSR	Maricopa	49 min
Jul 14, 9:45 PM PDT	Severe Thunderstorm Warning	PSR	Maricopa	45 min
Jul 14, 9:57 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Jul 14, 9:59 PM PDT	Areal Flood Advisory	PSR	Maricopa	2 hr
Jul 14, 10:13 PM PDT	Severe Thunderstorm Warning	PSR	Maricopa	47 min
Jul 14, 10:19 PM PDT	Severe Thunderstorm Warning	PSR	Maricopa	41 min
Jul 14, 10:40 PM PDT	Special Weather Statement	PSR	Maricopa	50 min
Jul 14, 10:46 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Maricopa	3 hr
Jul 14, 10:53 PM PDT	Severe Thunderstorm Warning	PSR	Maricopa	52 min
Jul 14, 11:02 PM PDT	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	43 min
Jul 14, 11:32 PM PDT	Special Weather Statement	PSR	Maricopa	43 min
Jul 15, 3:30 PM PDT	Special Weather Statement	PSR	Gila	45 min
Jul 15, 4:12 PM PDT	Special Weather Statement	PSR	Gila	48 min
Jul 15, 4:48 PM PDT	Special Weather Statement	PSR	Gila	42 min
Jul 14, 5:12 PM PDT	Areal Flood Advisory	PSR	Riverside, San Bernardino	3 hr
Jul 15, 2:35 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	4 hr
Jul 15, 3:02 PM PDT	Severe Thunderstorm Warning	PSR	Riverside	43 min
Jul 15, 3:04 PM PDT	Special Weather Statement	PSR	Riverside	41 min
Jul 15, 3:08 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	3 hr
Jul 15, 3:15 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	3 hr
Jul 15, 3:26 PM PDT	Areal Flood Advisory	PSR	Riverside, San Bernardino	29 min
Jul 15, 4:02 PM PDT	Severe Thunderstorm Warning	PSR	Riverside	43 min
Jul 15, 4:06 PM PDT	Areal Flood Advisory	PSR	Riverside	3 hr
Jul 15, 4:18 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	3 hr
Jul 15, 4:42 PM PDT	Special Weather Statement	PSR	Riverside	48 min

Nearby

Flash Flood Warnings in California, 2024 Every flash flood warning in 2024

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.