Weather API:
https://api.forecast.io/forecast/84e8ee5ad3a2009207d5aca9e72f1f34/47.642282,-122.125821

Xpath for current:
//currently
*The above selects only the current forecast. 

Xpath for forecast: 
daily/data[position() mod 2 = 1 and position() <= 6] 
*The above selects every other forcast node (the feed alternates day & night) and limits it to 3 days.


How to increment the days in forecast feed:
{&exp:date(AddDays([&now], [&row]),'dddd')}