UPDATE - This issue has been broken down into 3 more issues:
Forecast Today #19 -- COMPLETE #22
Forecast Current #20
Forecast Overview #21
As a VISITOR or USER,
When viewing a location forecast,
I see:
Today's forecast overview
Today's forecast additional details
7 day forecast (first day is today)
As a USER and not a VISITOR,
I see a flag that indicates if this location
has been added to my favorites,
and I can interact with this flag/button
to add/remove from my favorites.
Kate-v2
commented
5 years ago 
UPDATE - This issue has been broken down into 3 more issues:
As a VISITOR or USER, When viewing a location forecast, I see:
As a USER and not a VISITOR, I see a flag that indicates if this location has been added to my favorites, and I can interact with this flag/button to add/remove from my favorites.