Co With these values of T_, am EL, and the taboLated valiie of thc- 

 decay diistance D ^ from Figure 6 finA T^/T^, and f^/H^ and calculate the 

 period TL and the height IL at the end of the decay. 



d. Prom Fig-ure 7s with TL and D find the travel time to the 

 area under considerationo 



The values of period and height T and IL from (c) above are ths significant 

 deep water period and height respBctively, for waves from this fetch being 

 analyzed a 



19 o On a later chartj drawn for a time Z after the first chart for 

 the fetch corresponding to the one chosen previously: 



ao Measure and tabulate Up, F and D 



b» Enter Figure ^ with the "U, " from the preceding chart and 

 move along the "U" line to its intersection with the t^ + Z/2 duration line 

 or the duration corresponding to F. + Z/2, whichever comes firsto 



Co From this point follow one of the dotted lines plotted or 

 interpolatedj to either 



(1) the wind velocity line U,- or 



(2) the fetch line F^ whichever comes firsto If Fp cones 

 first 5, drop down "along the Fp line, to its intersection 

 t-rith U^o If U^ comes first, move along Up to its 

 intersection either with duration line t.^ + Z (or the 

 duratic'i' corresponding to F^ + Z) or Fp whichever corr^s 

 first, 



(3) If the dotted line does not ireet U or Fp,, follow it to 

 the diagonal line labelled "maximum conditions" at the 

 right of the graph and follox-j- thi.s line to its inter- 

 section with Upo 



do At any of these final points along U , read off Tp and H^. 



So and fo Same as steps c and d, paragraph l8o 



20o To illustrate the preceding steps., the following short forecast 

 is madeo Synoptic conditions are shown on Figures Sj, 9, and lOo 



lU 



