Hi Thomas, Sorry to rehash an old thread, but I was looking though your wxformulas.py for more info on the ET calc. As you mentioned, ET used to be calculated as a rate but now is just a measured quantity, like rain. However, the calcs and the examples in wxformulas.py still reference a rate.
For example, line 687: Returns: Evapotranspiration in mm/hr Example (Example 19 in the reference document): >>> sr_mean_wpm2 = 680.56 # == 2.45 MJ/m^2/hr >>> timestamp = 1475337600 # 1-Oct-2016 at 16:00UTC >>> print "ET0 = %.2f mm/hr" % evapotranspiration_Metric(Tmin_C=38, Tmax_C=38, rh_min=52, rh_max=52, ... sr_mean_wpm2=sr_mean_wpm2, ws_mps=3.3, wind_height_m=2, ... latitude_deg=16.217, longitude_deg=-16.25, altitude_m=8, timestamp=timestamp) ET0 = 0.63 mm/hr Another example, this time for night >>> sr_mean_wpm2 = 0.0 # night time >>> timestamp = 1475294400 # 1-Oct-2016 at 04:00UTC (0300 local) >>> print "ET0 = %.2f mm/hr" % evapotranspiration_Metric(Tmin_C=28, Tmax_C=28, rh_min=90, rh_max=90, ... sr_mean_wpm2=sr_mean_wpm2, ws_mps=3.3, wind_height_m=2, ... latitude_deg=16.217, longitude_deg=-16.25, altitude_m=8, timestamp=timestamp) ET0 = 0.03 mm/hr -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
