Great but no precip amt or complication
The primary thing I want from a weather app is the ability to quickly determine how todays temp will compare to yesterdays, and if and when there may be any precipitation. Weather Nerd is ideally suited for that task because it presents these data in a single line graph, which the brain can process much faster than reading a lot of text (although there are also text summaries for those who prefer that). Most importantly, in the Today panel (within the main app) or the Day widget (for the iOS today view in notification center), the app uses a static x-axis for time (with 12 am or 3 am as the starting point, as chosen by the user) so you always can look at the same part of the graph to quickly determine forecasted conditions (for example, what will the temp be like at noon when I usually run, or will there be rain at 6 pm when I typically walk my dog) - whereas most other apps dynamically set the starting point of the x-axis as the current time, which makes a graph more difficult to interpret because your brain has to re-calibrate whenever you look at the graph.
The app also has great line graphs for forecasts in the next hour and for tomorrow, and a bar graph for the entire week. It can automatically update to your current location. It can send you daily notifications with an overview of the days forecast. It integrates your calendar so you can check forecast during a critical event. It uses the excellent forecast.io data. The list of features goes on and on...
Only things keeping it from getting 5 stars are:
1) text summary of weather in iphone/ipad app does NOT include amount of precipitation - such as 3 in. of snow. Instead one has to tap nerd out button.
2) Watch app is lacking any indication of location, and does not have a complication. So I use carrot weather on the watch and weather nerd on iphone/ipad
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Weather Nerd