Thanks so much for your reply and I figured it out and have added a city field that also has a parent key, after reading your reply and reviewing your code (your JSON parser blog wasn't clear enough for me!).
For other readers: I couldn't read the Sun rise and fall fields and realized that I had to do an Astronomy call (found the get function but it didn't return anything). To get it to work, I added the following call, right after the forecast one (works with the free license):
wunderground.updateAstronomy(WUNDERGRROUND_API_KEY, WUNDERGRROUND_LANGUAGE, WUNDERGROUND_COUNTRY, WUNDERGROUND_CITY);
Thanks again, Jim