Format for Whitewater precip/IRT:

IRT are 30 minute averages, precipitation is accumulation
over a 30 minute period.

column  variable
1       year
2       jday (1-366)
3       interval start time GMT - hour
4       interval start time GMT - minute
5       precipitation (mm)
6       IRT facing NW (degrees C)
7       IRT facing SE (degrees C)
8       IRT facing NE (degrees C)