NO. 6 



SOLAR RADIATION AND WEATHER — CLAYTON 



57 



were also used in forecasting. These were supplemented by tele- 

 grams of the maximum temperature obsei-ved at Seattle, Williston, 

 and Chicago, in order to ascertain to what extent the temperatures 

 at those stations were responding to solar changes. 



Fig. 42. — Mean temperature at New York forecasted four days in advance. 



A plot of the mean temperatures following the forecasts for 

 four days ahead is given in figure 42. This figure shows that when 

 temperature above normal was forecasted, the mean temperature 

 rose from near normal two days following the observations on which 

 the forecast was based to a maximum departure on the day for which 



