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Update the live tiles with current weather info
When the app is running, it updates the live tile every few minutes. But you can also create a background task that updates the live tiles when the app is not running.
To create an acceptable experience, the app currently sets an expiration date of 1 day on the tiles to avoid stale weather info. That way, if the app hasn't been run in a while, the user sees the logo image on the tile instead of yesterday's data.