Will any features require a paid subscription?

The stuff that matters day to day — current conditions, the forecast, severe weather alerts — stays free, permanently. That's not a promotional price, that's the plan. Down the road we're planning an optional paid tier for the specialist stuff (30-day outlooks, historical comparisons, marine and boating forecasts) for people who want more than the daily basics — but nobody's ever getting charged just to see if it's going to rain.