MISCELLANEOUS SUBJECTS AXD TABLES. 369 



No. 2, with No. 4 above it: warmer weather, rain or snow 



No. 2, with No. 4 below it : colder weather, rain or siiow. 



No. 3, with No. 4 above it : warmer weather, with local rains 

 or snow. 



No. 3, with No. 4 below it : colder weather, with local rains or 

 snow. 



Explanation of Whistle Signals. 



A warning blast of from fifteen to twenty seconds' duration is 

 sounded to attract attention. After this warning the longer blasts 

 (of from four to six seconds' duration) refer to weather, and shorter 

 blasts (of from one to three seconds' duration) refer to temperature; 

 those for weather are sounded first. 



Blasts. Indicate. 



One long Fair weather 



Two long Rain or snow 



Three long Local rain or snow 



One short Lower temperature 



Two short Higher temperature 



Three short Cold wave 



By repeating each combination a few times, with intervals of 

 ten seconds, liability to error in reading the signals may be 

 avoided. 



Explanation of Storm and Hurricane Warnings. 



Storm warning. — A red flag with a black center indicates that 

 a storm of marked violence is expected. 



The pennants displayed with the flags indicate the direction 

 of the wind: red, easterly (from northeast to south); white 

 westerly (from southwest to north). The pennant above the 

 flag indicates that the wind is expected to blow from the north- 

 erly quadrants; below, from the southerly quadrants. 



By night a red light indicates easterly winds, and a white 

 light abo' e a red light, westerly winds. 



Hurricane "warning. — Two red flags with black centers, dis- 

 played one above the other, indicate the expected approach of a 

 tropical hurricane, or one of those extremely severe and dangerous 

 storms which occasionally move across the Lakes and northern 

 Atlantic roast. 



No night hurricane warnings are displayed. 



