If you change the setting from the top right it should stick the setting in the url and this will be used for follow up searches. For instance this uses the `us` preset with imperial units:

https://merrysky.net/forecast/poughkeepsie/us

If no setting is chosen it currently defaults to SI units. It's not ideal even from my perspective, wind speed in m/s is hard to grasp compared to km/h. In a near update I'd like to have it default to the unit of measurement culturally used at the location of the forecast and allow to save it to user local storage settings for more consistency.