Alert archive / Washington / Flash Flood Warnings in 2025

Flash Flood Warning 1, NWS Seattle, WA

December 15, 2025King County, Washington

NWS Seattle, WA issued this flash flood warning at Dec 15, 2025, 11:51 AM PST for King 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: Dec 15, 2025, 11:51 AM PST (19:51 UTC)
Expired: Dec 15, 2025, 5:19 PM PST
In force: 5 hr
Issued by: NWS Seattle, WA
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: Unknown

County King County, WA

The radar

The Seattle radar (KATX), 92 km from the middle of the area, began a volume at 19:55 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

Salem/Mcnary, OR (KSLE), launched 12:00Z, 7.9 hours before the alert went out and 300 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: 1350 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 600 m²/s²
0-3 km storm-relative helicity: 726 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 Seattle, WA wrote its last area forecast discussion before this flash flood warning went out at Dec 15, 10:16 AM PST, 1 hour 35 minutes earlier.

Area forecast discussion, Dec 15, 10:16 AM PST, 1 hour 35 minutes before

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In the hours before

Local storm report, Dec 15, 7:57 AM PST, 3 hours 54 minutes before

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Local storm report, Dec 15, 9:01 AM PST, 2 hours 50 minutes before

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Special weather statement, Dec 15, 9:28 AM PST, 2 hours 23 minutes before

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Local storm report, Dec 15, 10:23 AM PST, 1 hour 28 minutes before

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Local storm report, Dec 15, 11:28 AM PST, 23 minutes before

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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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Local storm report, Dec 15, 11:29 AM PST, 22 minutes before

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      <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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      <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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The office that day

Everything else NWS Seattle, WA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 15, 12:45 AM PST	High Wind Watch	SEW	Clallam, Grays Harbor, Island, Jefferson, King, Kitsap and 8 more	13 hr
Dec 15, 1:03 AM PST	River Flood Warning	SEW	Skagit	70 hr
Dec 15, 1:27 AM PST	Winter Storm Watch	SEW	Clallam, Grays Harbor, Jefferson, King, Lewis, Mason and 4 more	12 hr
Dec 15, 3:01 AM PST	Gale Watch	SEW		24 hr
Dec 15, 3:01 AM PST	Small Craft Advisory	SEW		5 days
Dec 15, 5:34 AM PST	River Flood Warning	SEW	Mason	9 days
Dec 15, 8:04 AM PST	Areal Flood Advisory	SEW	Grays Harbor, Mason	3 hr
Dec 15, 1:55 PM PST	Winter Storm Warning	SEW	Clallam, Grays Harbor, Jefferson, King, Lewis, Mason and 4 more	23 hr
Dec 15, 1:55 PM PST	Winter Weather Advisory	SEW	Clallam, Grays Harbor, Jefferson, King, Lewis, Mason and 1 more	13 hr
Dec 15, 2:06 PM PST	Wind Advisory	SEW	Clallam, Grays Harbor, Island, Jefferson, King, Kitsap and 8 more	13 hr
Dec 15, 2:42 PM PST	River Flood Warning	SEW	Snohomish	50 hr

Nearby

Flash Flood Warnings in Washington, 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.