Casablanca and vicinity: On November 9 "between 240'0 

 and g(8gf0: Swell from NV, height 8 to 12 feet, period 

 11.4 "to 11+ seconds. Svjell Increasing during the day. 



ThjLS forecast did not need modification on November 8 because 

 the weather laap of the 8th showed the estimate of the following wind 

 to be nearly correct. 



The following values were observed on the morning of November 9: 



Locality 



Mehedya 



Rabat 



Casablanca 



Safi 



Mogador 



The observations at Safi give consistently lower values than 

 those at neighboring stations, possibly because the locality at 

 which observations were made is less exposed. For the other sta- 

 tions the forecast height of the swell was nearly correct, but at 

 the northern stations the forecast period v/as too short. 



FORECASTING OF THE STATE OF THE SEA 



A forecast of the state of the sea must be based on the con- 

 clusions as to the state of the sea drawn from preceding and cur- 

 rent v.'eather maps and upon a prognostic weather map. The procedure 

 in using the prognostic weather map is exactly the same as that 



56 



