Alert archive / California / Flash Flood Warnings in 2025

Flash Flood Warning 19, NWS Phoenix, AZ

August 25, 2025Riverside County, California

NWS Phoenix, AZ issued this flash flood warning at Aug 25, 2025, 6:57 AM PDT for Riverside 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: Aug 25, 2025, 6:57 AM PDT (13:57 UTC)
Expired: Aug 25, 2025, 10:00 AM PDT
In force: 3 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Riverside County, CA

The radar

The San Diego radar (KNKX), 134 km from the middle of the area, began a volume at 13:58 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, 2.0 hours before the alert went out and 154 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: 1772 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 49 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 Aug 25, 4:47 AM PDT, 2 hours 10 minutes earlier.

Area forecast discussion, Aug 25, 4:47 AM PDT, 2 hours 10 minutes before

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In the hours before

Special weather statement, Aug 25, 1:26 AM PDT, 5 hours 31 minutes before

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Special weather statement, Aug 25, 3:23 AM PDT, 3 hours 34 minutes 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.
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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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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 7:21 PM PDT	Special Weather Statement	PSR	La Paz	39 min
Aug 25, 12:50 AM PDT	Special Weather Statement	PSR		25 min
Aug 25, 1:26 AM PDT	Special Weather Statement	PSR	Maricopa	49 min
Aug 25, 2:00 AM PDT	Blowing Dust Advisory	PSR	Maricopa, Pinal	17 hr
Aug 25, 2:00 AM PDT	Flood Watch	PSR	La Paz, Maricopa, Yuma	19 hr
Aug 25, 3:23 AM PDT	Special Weather Statement	PSR	Yuma	52 min
Aug 25, 2:23 PM PDT	Special Weather Statement	PSR		52 min
Aug 25, 2:49 PM PDT	Special Weather Statement	PSR		41 min
Aug 25, 3:11 PM PDT	Special Weather Statement	PSR		49 min
Aug 25, 3:32 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Yuma	4 hr
Aug 25, 3:50 PM PDT	Dust Storm Warning	PSR	Maricopa, Pinal	55 min
Aug 25, 3:56 PM PDT	Dust Storm Advisory	PSR	Maricopa	49 min
Aug 25, 4:38 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Yuma	4 hr
Aug 25, 4:41 PM PDT	Dust Storm Warning	PSR	Maricopa, Pinal	64 min
Aug 25, 4:59 PM PDT	Special Weather Statement	PSR	Yuma	31 min
Aug 25, 7:56 AM PDT	Areal Flood Advisory	PSR	Riverside	2 hr
Aug 25, 1:23 PM PDT	Severe Thunderstorm Warning	PSR	Imperial	52 min
Aug 25, 2:08 PM PDT	Severe Thunderstorm Warning	PSR	Imperial	52 min
Aug 25, 2:11 PM PDT	Severe Thunderstorm Warning	PSR	Imperial	49 min
Aug 25, 2:37 PM PDT	Severe Thunderstorm Warning	PSR	Imperial	38 min
Aug 25, 2:42 PM PDT	Severe Thunderstorm Warning	PSR	Imperial	33 min
Aug 25, 2:55 PM PDT	Areal Flood Advisory	PSR	Imperial	4 hr
Aug 25, 3:00 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Aug 25, 3:10 PM PDT	Dust Storm Advisory	PSR	Imperial	65 min
Aug 25, 3:12 PM PDT	Severe Thunderstorm Warning	PSR	Imperial	48 min
Aug 25, 3:21 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Aug 25, 3:25 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Aug 25, 3:40 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside, San Bernardino	4 hr
Aug 25, 3:57 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Aug 25, 4:15 PM PDT	Special Weather Statement	PSR	Riverside	45 min

Nearby

Flash Flood Warnings in California, 2025 Every flash flood warning in 2025

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.