ISS Passes Over Seattle

Next ISS Pass Over Seattle

Loading a forecast, not a live observation.

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Seattle and Vancouver need their own reference observers

A forecast labelled Seattle is not interchangeable with one labelled Vancouver. This page uses PocketWorld's SEA reference coordinates; the Vancouver guide uses its own YVR entry. Keep both sets of coordinates and the UTC date before comparing schedules across the border. A difference between two rows need not mean one provider is late: the observer inputs are different.

Use the reference codes only to identify each calculation. Neither page asks for your geolocation, surveys your neighbourhood horizon or proposes an airport as a viewing location. The globe button opens the station's wider orbital context and does not move the fixed observer in this table. For a position-specific forecast, select the intended place in a tool that accepts those observer settings.

A pass on the map and a viewing opportunity answer different questions

The globe shows available station-position context, while this table asks the forecast service for qualifying visual opportunities. Do not infer a visible Seattle pass merely because a ground track is nearby, and do not infer that the station has stopped orbiting when the table is empty. An empty successful response applies only to the stated observer, request window and minimum-duration filter. An unavailable response supplies no reliable list.

Compare the initial direction with maximum elevation before checking your actual horizon. The table contains no trees, buildings or terrain model. The separate visible-duration field may be shorter than the predicted start-to-end window, so preserve both when discussing an opportunity. Do not fill an unknown magnitude with an invented estimate.

Make a Seattle note that remains understandable tomorrow

Record the UTC calendar date, start, end, source retrieval time and SEA reference together. Convert the date as well as the hour for a local reminder; do not save only the countdown. Use the National Weather Service for a separate forecast at your observing location and the correct valid time. The Canadian weather resource on the Vancouver page answers a separate location's question, not Seattle's. If a schedule is partial or stale, retain that notice in a shared note instead of presenting the remaining rows as a complete, freshly issued sighting alert.

Observer settings and forecast scope

Reference: SEA, Seattle, USA. Latitude 47.4502°, longitude -122.3088°. Observer altitude input: 0 metres. This fixed input is not a measurement of the city's elevation or your location. The request asks N2YO for up to 10 days of visual passes with a minimum visible duration of 60 seconds. Results can be cached for up to one hour; the retrieval timestamp is shown with the table.

All table dates and times are UTC, not automatically converted to your local time zone. Keep the date when converting. The countdown depends on your device clock. A predicted start and end describe a pass window; the separately reported visible duration can be shorter. Maximum elevation is an angle above the horizon. An unknown magnitude is not a prediction of a faint pass.

When the table cannot answer your question

Read the status message before relying on the countdown. A partial list contains only the source entries that passed validation. An unavailable result provides no reliable schedule at all. The page makes one bounded request rather than repeatedly contacting the provider in the background. If loading fails, reloading makes another attempt; the source links below remain usable independently of that request. Closing or leaving the page stops its countdown timer.

Seeing the ISS from Seattle

A forecast is not proof of visibility from your position. Sunlight on the station, a sufficiently dark sky, cloud and your local horizon all matter. The globe's position marker is not a confirmed sighting.

Observation and forecast sources

• NASA Spot the Station — an independent location-specific observation resource, not the source of this table.
• NASA Spot the Station FAQ — visibility and prediction fields.
• N2YO API documentation — forecast data, observer inputs and field definitions.
• National Weather Service — select your US observing location and forecast valid time for a separate sky-condition check.