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United States Storm Warning Signals

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The upper dial of the repeater is graduated in 10-degree intervals and shows the relative direction from which the wind is blowing. In this illustration the direction is about 287 . The lower dial indicates the relative wind speed (true wind speed when the ship is stationary). The wind-speed dial in the illustration shows about 87 knots. This reading means that the force exerted by 87 knots of wind is whirling the anemometer propeller. When you use an installed anemometer, always compare  the  readings  observed  with  the  wind conditions as they appear outside. If two anemometers are installed, ensure that the windward anemometer is used. United States Storm Warning Signals.—The combinations of flags and pennants, as shown in figure  8-6,  are  hoisted  at  the  National  Weather Service and other shore stations in the United States to  indicate  the  presence  or  future  presence  of unfavorable winds. The means of the various displays are as follows: Small craft warning: One red pennant displayed by day and a red light over a white light at night to indicate that winds up to 38 miles per hour (33 knots) and/or  sea  conditions  dangerous  to  small  craft operations are forecast for the area. Gale  warning:  Two  red  pennants  displayed  by day  and  a  white  light  above  a  red  light  at  night  to indicate that winds ranging from 39 to 54 miles per hour (34 to 47 knots) are forecast for the area. Storm warning: One square red flag with a black center  displayed  during  daytime  and  two  vertical  red lights at night to indicate that winds 55 miles per hour (48 knots) and above, no matter how high the speed, are forecast for the area. If the winds are associated with a tropical cyclone (hurricane), the storm-warning display indicates that winds within the range of 55 to 73 miles per hour (48 to 63 knots) are forecast. Hurricane   warning   (displayed   only   in connection  with  a  tropical  cyclone  or  hurricane):  Two square red flags with black centers displayed at daytime and a white light between two vertical red lights at night to indicate that winds 74 miles per hour (64 knots) and above are forecast for the area. 8-17 MRP3F0504 Figure 8-4. An installed anemometer. WIND DIRECTION 0 330 30 300 60 90 12 270 240 210 180 150 WIND SPEED KNOTS 0 90 10 20 30 80 70 60 50 40 MRP3F0505 Figure 8-5. Synchro repeater showing relative wind velocity and direction.



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