Table 1 - Continued 

 Travel tinB (hours) 

 Arrival time 



33 



(7) 



27 Oct 

 213 OZ 



3_8(10) 



27 Oct 

 183 OZ 



20(10) 



28 Oct 

 0.3302 



(1) From Figure 2 



(2) From Figure 3 



(3) From Figure k 

 (k) Estimated 



27 Oct 27 Oct 27 Oct 

 (1230 PST)_(1030_PST) (1830 PST) _ 



(5) From Figure 5 mth U = Itl knots 



and t . ~ -6 hrs 

 raxn 



(6) Fr-om Figure 6 i>d.th T„ = -8,9 sec arid 

 D = 660 na.utical miles 



(7) From Figure 7 i>ri.th T„ = 10 sec and 

 D = 660 nautical miles 



(8) From figure 5 in the following manner o Follow the line U = ij.! knots 

 to the duration line of t + Z/2 = 6 •*• 6 = 12 hoursj follow an 

 imaginary dotted line from that point to its intersection with the U = iiO 

 knots line which occurs at a point wtere the duration = 13 hours*, 

 Add Z/2 to this duration (13 + 6 = 19)} and follow along U = IjO knots 



to the point where t =19 hours o 



Read off Tp, and IL„ 



(9). From Figure 6 



(10) Fr-om Figure 7 



(11) From Figure .'5 in the following mariner o Follox^- the line U = iiO knots 

 _to the durati^on line of t + 2/2 - 19 + 3 = 22; follow an imaginary 



' dotted line from that point t/O its intersection with the fetch line 

 F - it20 miles (which occurs at a point where the duration = 33 hours) 

 and drop down along this line to its intersection with the >n.nd 



velocity line of 29 knots » 



Read off T„ and IL, o 



21 o Synoptic weather charts have been drawn and conpiled for many 

 years by the United States Weather Bureau for Northern Ifemisphere regions™ 

 By appljring the preceding forecasting methods to these chartSj, statistical 

 studies may be made for any coastal locality by «*hindGa,sting" the character- 

 istics of waves that occurred in deep watero From these statistical studies 

 the predominant deep-water wave directions,, heightSp and lengths can be 

 determined. Wave chax'acteristies in transitional and shallow water can 

 then be determined by construction of refraction dia,gramSo 



22 " Mgy-?„€.Ji!!l-jJl§jggA"y:g.^jb!:.,..§P^..-^^:'^^^ ~ ^^ moving from deep 



water to'ffai^"a coast 5 a wave's characte"i:ditics eliangeo A wave travelling 

 shoreward over depths of less thaai one-half its deep water wave length moves 

 more slowly than it would in deeper water^ its length shortens and its 

 height is changed „ If the wave is approaching a coast at an angle to the 

 underii'rater contours ^ the par't of the wave wMch first passes over a depth 

 less than half its deep-water wave length will move more slowly than the 

 rest of the waveo This will cause the wave crest to bend toward alinement 



16 



