GG 



HOUR OF THE DAY (Greenwich Mean Time) 



dd or dwd„ 



TRUE DIRECTION FROM WHICH SURFACE 

 WIND IS BLOWING OR FROM WHICH 

 WAVE SYSTEM IS APPROACHING, IN lO's 

 OF DEGREES 



CODE 

 00 



Calm 



5- 



15° 



25° 



35° 



45° 



55° 



65° 



75° 



85° 



95° 



105° 



115° 



125° 



135° 



145° 



155° 



165° 



175° 



185° 



195° 



205° 



215° 



225° 



235° 



245° 



255° 



265° 



275° 



285° 



295° 



305° 



315° 



325° 



335° 



345° 



355° 



NNE. 



NE 



14° 

 24° 

 34° 

 44° 

 54° 



64° 



74° ENE 



84° 



94° E — 



104° 



114° ESE 



124° 



134° 



144° SE — 



154° 



164° SSE 



174° 



184° S — 



194° 



204° SSW 



224° 



234° SW 



244° 



254° WSW 



264° 



274° W 



284° 



294° WNW 



304° 



314° 



324° NW 



334° 



344° NNW 34 



354° 35 



4° N 36 



01 

 02 

 03 

 04 

 05 

 06 

 07 

 08 

 09 

 10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 

 28 

 29 

 30 

 31 

 32 

 33 



ff 



WIND SPEED 



Report speed In knots using two figures. 

 For example: a 9-knot wind is reported 

 as 09. Use the Beaufort Scale below when 

 no anemometer is available. Speeds above 

 99 knots ond unusual gustiness should be 

 noted in "Remarks" column. 



CODE 



Calm less than I knot 00 



Light airs 1-3 01 



Light breeze 4-6 02 



Gentle breeze 7-10 03 



Moderate breeze 11-16 04 



Fresh breeze 17-21 05 



Strong breeze — 22-27 06 



Moderate gale 28-33 07 



Fresh gale 34-40 08 



Strong gale 41-47 09 



Whole gale 48-55 10 



Storm 56-63 11 



Hurricane 64 and above 12 



E 



ELEVATION OF WIND MEASUREMENT 

 ABOVE SEA SURFACE 



CODE 

 0-9 feet 



10-19 1 



20-29 2 



30-39 3 



40-49 4 



50-69 5 



70-89 6 



90-130 7 



Greater than 130 8 



Wind strength by Beaufort Scale 9 



(no anemometer) 



DESCRIPTION OF WIND WAVES 



CODE 

 CALM — Sea like a mirror. 



SMOOTH — Small wavelets or rip- I 

 pies with the appearance of scales 

 buf without crests. 



SLIGHT — Short pronounced waves 2 

 or small rollers. Crests hove a glassy 

 appearance. 



MODERATE — Woves or large rollers. 3 

 Scattered whitecops on wove crests. 

 Sea produces short rustling sounds. 

 ROUGH — Waves with frequent 4 

 whitecops. Chance of some spray. 

 Sea noise is like a dull murmur. 

 VERY ROUGH -Waves tend to heap 5 

 up. Continuous whitecapping. Foam 

 from whitecops is occasionally blown 

 along by the wind as spindrift. The 

 waves produce a continuous murmur. 

 HIGH — High waves having exten- 6 

 sive whitecops from which foam is 

 blown in dense streaks. The seo be- 

 gins to roll and its noise is like a 

 dull roar. 



VERY HIGH — High waves heaping 7 

 up with long frothy crests that are 

 capping continuously to moke a 

 roaring noise. The great amount of 

 foam being blown from the crests 

 causes the sea surface to take on a 

 white appearance and may affect 

 visibility. Rolling of the sea becomes 

 heavy and shock-like. 



MOUNTAINOUS — Waves are so 8 

 high that ships within close dis- 

 tonces drop so low in the wave 

 troughs that they are lost from view 

 for o time. Wind bodily carries off 

 the crests of all waves, and the sea 

 is entirely covered with dense streaks 

 of foam. The air itself is so filled 

 with foam and spray as to seriously 

 affect visibility. The rolling of the 

 sea is tumultuous. 



CONFUSED — Waves cross each other 9 

 from many and unpredictable direc- 

 tions, developing a complicated in- 

 terference pattern difficult to de- 

 scribe. Waves may partially break 

 upon occasion. 



HwH„ 



HEIGHT OF THE SIGNIFICANT* WIND 

 WAVES OR SWEU 



Report height in feet using two figures. 

 For example a 5-foot wave is reported as 05. 



•^w* w 



w* w 



PERIOD OF THE SIGNIFICANT' 

 WAVES OR SWELL 



WIND 



Report period in seconds using two figures. 

 For example a 6-5econd wave is reported 06. 



■-w'-w""w 



LENGTH OF THE SIGNIFICANT* WIND 



WAVES OR SWELL 



Report length to nearest 10 feet, using 

 three figures, with final zero omitted. For 

 exomple, a 50-foot wove length is reported 



005, a 210-foot wove length is reported 

 021, etc. 



If observations ore made to nearest foot, 

 drop final figure if less than 5, ond odd 

 one to 10's figure if 5 or more. For ex- 

 ample, a 63-foot wave length is reported 



006, o 155-foot wove length is reported 

 016, etc. 



SWELL INDICATOR. SHOWS THAT NEXT 

 TWO GROUPS REFER TO SWELL 



* See p. 6. 



