Alert archive / Washington / Flash Flood Warnings in 2023

Flash Flood Warning 3, NWS Pendleton, OR

May 20, 2023Yakima County, Washington

NWS Pendleton, OR issued this flash flood warning at May 20, 2023, 2:15 PM PDT for Yakima County, Washington. 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: May 20, 2023, 2:15 PM PDT (21:15 UTC)
Expired: May 20, 2023, 7:24 PM PDT
In force: 5 hr
Issued by: NWS Pendleton, OR
Area: Storm-based polygon
Flood severity: None

County Yakima County, WA

The radar

The Pendleton radar (KPDT), 169 km from the middle of the area, began a volume at 21:17 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

Spokane, WA (KOTX), launched 12:00Z, 9.3 hours before the alert went out and 356 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: 175 J/kg
Mixed-layer CIN: -151 J/kg
Mixed-layer LCL: 2144 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 4 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 Pendleton, OR wrote its last area forecast discussion before this flash flood warning went out at May 20, 10:08 AM PDT, 4 hours 7 minutes earlier.

Area forecast discussion, May 20, 10:08 AM PDT, 4 hours 7 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 Pendleton, OR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 19, 5:10 PM PDT	Flash Flood Warning	PDT	Jefferson, Wasco	3 hr
May 19, 5:21 PM PDT	Severe Thunderstorm Warning	PDT	Jefferson, Wasco	54 min
May 19, 6:12 PM PDT	Special Weather Statement	PDT	Wasco	33 min
May 19, 6:26 PM PDT	Special Weather Statement	PDT	Hood River	34 min
May 19, 6:38 PM PDT	Special Weather Statement	PDT	Wheeler	37 min
May 19, 6:57 PM PDT	Special Weather Statement	PDT	Sherman	48 min
May 19, 7:31 PM PDT	Special Weather Statement	PDT	Gilliam	44 min
May 20, 2:41 PM PDT	Special Weather Statement	PDT	Wallowa	34 min
May 20, 4:13 PM PDT	Special Weather Statement	PDT	Grant	32 min
May 20, 4:46 PM PDT	Special Weather Statement	PDT	Grant	29 min
May 20, 4:56 PM PDT	Special Weather Statement	PDT	Grant	34 min
May 20, 4:58 PM PDT	Special Weather Statement	PDT	Deschutes	32 min
May 19, 7:01 PM PDT	Special Weather Statement	PDT	Yakima	44 min
May 19, 8:42 PM PDT	Special Weather Statement	PDT	Kittitas	33 min
May 20, 2:47 PM PDT	Special Weather Statement	PDT	Yakima	28 min
May 20, 3:19 PM PDT	Special Weather Statement	PDT	Kittitas	26 min
May 20, 3:40 PM PDT	Special Weather Statement	PDT	Kittitas	35 min
May 20, 3:42 PM PDT	Special Weather Statement	PDT	Yakima	33 min
May 20, 4:43 PM PDT	Special Weather Statement	PDT	Yakima	32 min

Nearby

Flash Flood Warnings in Washington, 2023 Every flash flood warning in 2023

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.