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Seattle weather alerts

1 active alert for Seattle, Washington right now: a Dense Fog Advisory.

8 in the last 30 days 10 in 12 months (since Aug 30) most common: Dense Fog Advisory Get alerts on your phone →

Active alerts for King County

NWS issues alerts by county; Seattle is in King County. Refreshed every few minutes; times in PDT.

Moderate Expected

Dense Fog Advisory

Issued Mon, Oct 5, 3:58 AM PDT by NWS Seattle WA Until Mon, Oct 5, 12:00 PM PDT (in 7 hr)

Area: Foothills and Valleys of Pierce and Southern King Counties; Foothills and Valleys of Thurston and Lewis Counties; Lowlands of Pierce and Southern King Counties; Olympia and Southern Puget Sound; Lowlands of Lewis and ...

* WHAT...Areas of visibility one half mile or less in dense fog. * WHERE...Grays Harbor County Coast, Lower Chehalis River Valley, Middle Chehalis River Valley, Foothills and Valleys of Pierce and Southern King Counties, Foothills and Valleys of Thurston and Lewis Counties, Lowlands of Lewis and Southern Thurston Counties, Lowlands of Pierce and Southern ...

What it means: Visibility of a quarter mile or less is expected. Slow down and use low beams.

Full alert with map and forecast →

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Where

King County on the map

Alert polygons are NWS's own. Forecast Bar's radar shows the same warnings over live precipitation, with future radar and lightning. See the radar.

Last 30 days

Recent alerts for King County

Alert	Issued	Ended	Issued by
Dense Fog Advisory	3:57 AM	12:00 PM	Seattle WA
Dense Fog Advisory	Oct 4, 10:51 AM	Oct 4, 11:00 AM	Seattle WA
Dense Fog Advisory	Oct 4, 9:48 AM	Oct 4, 11:00 AM	Seattle WA
Dense Fog Advisory	Oct 4, 4:43 AM	Oct 4, 10:00 AM	Seattle WA
Wind Advisory	Sep 25, 4:50 PM	Sep 25, 5:00 PM	Seattle WA
Wind Advisory	Sep 25, 1:44 PM	Sep 25, 5:00 PM	Seattle WA
Wind Advisory	Sep 25, 2:09 AM	Sep 25, 5:00 PM	Seattle WA

Pattern

What King County gets alerted for

Every alert that named King County in the last 12 months, by type. Records begin August 30, 2026, so this fills in over the year.

Dense Fog Advisory

Wind Advisory

Special Weather Statement

Plain English

What these alerts mean

A warning means the hazard is happening or about to; a watch means conditions favour it; an advisory is a lesser hazard still worth planning around.

Dense Fog Advisory

Visibility of a quarter mile or less is expected. Slow down and use low beams.

Wind Advisory

Sustained winds of 30 mph or more, or gusts to 45 mph, are expected. Use caution driving high-profile vehicles.

Special Weather Statement

A heads-up about conditions that do not meet warning or advisory criteria but still deserve attention, such as a strong storm, patchy fog or a brief burst of snow.

Nearby

Alerts near Seattle

Cities

Kirkland, WA1 Bellevue, WA1 Shoreline, WA1 Burien, WA1 Redmond, WA1 Renton, WA1

Neighbouring counties in Washington

Pierce County1 Snohomish County1 Kitsap County Thurston County1 Kittitas County Chelan County Yakima County All of Washington →

Questions

About Seattle alerts

How do I get Seattle weather alerts on my iPhone?

Install Forecast Bar, add Seattle as a location, and turn on severe weather alerts. Every NWS warning, watch and advisory for King County then arrives as a push notification at the moment of issue, with Critical Alerts available for the most dangerous warnings. Forecast Bar also runs on iPad, Apple Watch, Mac and Apple TV.

Where do these alerts come from?

From the National Weather Service alert feed (api.weather.gov). NWS issues alerts by county and by forecast zone; this page lists every product that names King County, the county Seattle sits in. Forecast Bar checks the feed continuously and this page refreshes within a few minutes of a change.

What is the difference between a watch, a warning and an advisory?

A warning means the hazard is occurring, imminent or very likely: act now. A watch means conditions are favourable for it to develop: prepare and stay informed. An advisory covers a hazard that is less serious than a warning but can still cause real inconvenience or danger if you are not ready for it.

Can I get this data as JSON?

Yes. /weather-alerts/wa/seattle.json returns the active alerts, the last 30 days and the 12-month counts for Seattle, refreshed every minute. Please cache responses and credit National Weather Service as the source.

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