APPENDIX VI 



WIND WAVE/WIND SPEED TABLE 



'IND SPEED 

 KNOTS 



, SEAMAN'S 



„ PER TERM 

 HOUR ' 



.""derl | under l | C alm 



l" 5 I Light air 



6-11 I Light 



breez e 

 '2-19 J Gentle - 

 breeze 



W-28 \ Moderate" 

 breez e 

 29-38 | FTeTiT 



-= ijreeze 



22-27 39-irptFiT 



1 I breeze 



28-33 | 50-61 | ModeTaF 

 gale 



WORLD 

 METEORO- 

 LOGICAL 

 ORGANI- 

 ZATION 



(1964) 



Calm 

 Light air 



TighT 



breez e 

 Gentle 



breeze 

 Moderate 

 bree ze 

 Fresh 



breez e 

 Strong 



breeze 

 Near gale 



WIND WAVE/WIND SPEED TABLE 



ESTIMATING WIND SPEED 

 EFFECTS OBSERVED AT SEA EFFECTS OBSERVED ON LAND 



WORLD METEOROLOGICAL 

 ORGANIZATION 



TERM CODE 



Sea like mirror. 



Ripples with appearance of scales- no 



roam crests . 



. pearance. not breaking 

 Ljl ^«to; crests begin to break" 



scattered whitecaps. 



.Calm; smoke rises vertinaiiy 



HEIGHT 

 OF WAVES 

 IN FEET 



Gale 



Strong 

 gale 



gale 



storm 



M-71 118-133" 

 I 134-149 

 150-166 



l n 9 n°", 9 n fl l! 67 " 183 | Hurncane I Hurricane 

 100-108 184-201 



09-118 202-220 



SraTT *^sTb^tai1^e7^e7 

 ous whiteca ps 



^te~^et^kin7lo^ 

 — ggD lwhitecaps ; some T s Y 

 Larger waveifoTminl^tops" 

 __gver ywhere; more sprav 

 Seal ^l^hn7elclf^^ 

 mg waves begins to be blown in 

 .streaks. 



Moo^teVh^Tves f gr^aleT 



length; edges of crests begin to break 

 into spindrift; foam is blown in well- 

 marked streaks. 



^^^eTTe^ToToTNe^ 

 streaks of foam; spray may reduce 

 visibility. 



very nigh waves with overhanging 



crests; sea takes white appearance 

 astoam is blown in very dense 



streaks; rolling ,s heavy and visi- 

 . bility reduced 



with white foam patches; visibility 

 HI more reduced 



Air filled with foam; sea completely 



white with driving spray; visibility 

 greatly reduced. 



Smoke drift mdicates^dT^T 1 ^'^ 

 J{ajies_do_not_move 



begin to move 

 LM^is, small twigs~TnTo7iitenTrTra" 



L°n J Jigb[na i s_e i tej^ 



Dust, leaves, and loose paper raised 

 U P; small branches move 



Small trees m leaf begin to sway 



"^^a^eTFfrierm^oT^ 

 . whistling heard in wires 

 Whole trees in motion; resistance felt" 

 m walking against wind. 



T ^a^a7Tb7a^7b^ten^ 

 trees; progress generally impeded. 



^nT^uTi^ia^^ 

 blown from roofs. 



Seldom experienced on land; trees 



broken or uprooted; considerable 

 structural damage occurs. 



pled 

 Smooth, wave- 

 Jet^ 



Slight 



Moderate 



Rough 



Very rough 



3 



1 2-4 



4 



4-8 



5 



8-13 J 



13-20 



I High 



Very high 



Very rarely experienced on land- 

 usually accompanied by widespread | Phenomenal 



20-30 



30-45 



over 45 



433 



