Alert archive / California / Flash Flood Warnings in 2022

Flash Flood Warning 268, NWS Phoenix, AZ

September 9, 2022Imperial County, California

NWS Phoenix, AZ issued this flash flood warning at Sep 9, 2022, 2:17 PM PDT for Imperial County, California. It was in force for 5 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: Sep 9, 2022, 2:17 PM PDT (21:17 UTC)
Expired: Sep 9, 2022, 7:15 PM PDT
In force: 5 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Imperial County, CA

The radar

The Yuma radar (KYUX), 90 km from the middle of the area, began a volume at 21:20 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, 9.3 hours before the alert went out and 173 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: 67 J/kg
Mixed-layer CIN: -325 J/kg
Mixed-layer LCL: 2114 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 54 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 Sep 9, 12:01 PM PDT, 2 hours 16 minutes earlier.

Area forecast discussion, Sep 9, 12:01 PM PDT, 2 hours 16 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

Local storm report, Sep 9, 11:25 AM PDT, 2 hours 52 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>

Local storm report, Sep 9, 12:31 PM PDT, 1 hour 46 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>

Local storm report, Sep 9, 12:36 PM PDT, 1 hour 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
1236 PM MST FRI SEP 9 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1235 PM     HEAVY RAIN       MOUNTAIN SPRING         32.67N 116.09W
09/09/2022  M2.67 INCH       IMPERIAL           CA   MESONET

            MESONET STATION TNSC1 MOUNTAIN SPRINGS
            GRADE, INCLUDING 1.02 IN. MEASURED IN 1 HR.

&&

JS

Local storm report, Sep 9, 2:04 PM PDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
204 PM MST FRI SEP 9 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0151 PM     FLASH FLOOD      1 W DIXIELAND           32.79N 115.80W
09/09/2022                   IMPERIAL           CA   LAW ENFORCEMENT

            CHP REPORTS VEHICLE WASHED OFF EVAN HAWES
            HIGHWAY.

&&

PI

Local storm report, Sep 9, 2:07 PM PDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
207 PM MST FRI SEP 9 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0149 PM     FLASH FLOOD      1 NNW MOUNTAIN SPRING   32.68N 116.10W
09/09/2022                   IMPERIAL           CA   LAW ENFORCEMENT

            SEVERAL CHP REPORTS OF ROCKS ON I-8,
            INCLUDING A BOULDER THE SIZE OF A VEHICLE.

&&

PI

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 9, 3:10 PM PDT	Special Weather Statement	PSR	Pinal	50 min
Sep 9, 4:00 PM PDT	Special Weather Statement	PSR	Maricopa	45 min
Sep 9, 4:08 PM PDT	Areal Flood Advisory	PSR	Pinal	3 hr
Sep 9, 4:27 PM PDT	Dust Storm Advisory	PSR	La Paz, Maricopa, Pinal, Yuma	63 min
Sep 9, 4:42 PM PDT	Areal Flood Advisory	PSR	Maricopa, Pinal	3 hr
Sep 9, 4:51 PM PDT	Special Weather Statement	PSR	Maricopa	39 min
Sep 9, 8:47 AM PDT	Areal Flood Advisory	PSR	Imperial	4 hr
Sep 9, 10:29 AM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	5 hr
Sep 9, 11:24 AM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Sep 9, 12:06 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Sep 9, 1:22 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	2 hr
Sep 9, 3:07 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Sep 9, 3:37 PM PDT	Areal Flood Warning	PSR	Imperial	9 hr

Nearby

Flash Flood Warnings in California, 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.