To navigate the map to find the weather in the area you want you have two options:
Option 1: Search the map using a street name, region or postcode.
Once you're selected your region (or before, its totally up to you) you can then select a day using the nav bar on the right hand side, which is a constant throughout the application. This was a big part of the apps design development. All too often apps navigations don't follow the same rules usually placed upon a web design whereby the primary functions of the navigation are accessible from ALL areas.
Copy: The copy shown on screen is a very brief description of the weather, in either present of future tense based on your selection. The tone of voice of the copy references the slang /dialect used in the area in question.
Stats: The bar below the copy features a more detailed outline of the weather on the selected day. Featuring temperature, humidity and the general forecast i.e sunny, overcast, rain.
The combination of these two methods of data (if you can call the first one data) representation are to reduce the dry feel of the app. Although nice to look at, weather is after all, quite a boring thing, and we all need a bit more fun in our lives, especially in England, where the app will invariably present bad news.