Figube 2. (by John H. Conover). — The hurricane of September 14-15, 1944, as observed and recorded at the Blue Hill Meteorological 

 Observatory, Milton, Mass. (635 feet above sea level). The track of the center of lowest pressure passed about 10 miles south- 

 east of Blue Hill, and the observatory was within the central zone of lighter wind for more than an hour. 



Symbols used on United States weather maps are employed for the hourly cloudiness, the circle with a cross in it representing sky 

 obscured by cloud so low as to envelop top of Blue Hill, and the others graphically depicting roughly the amount of sky cover. 

 The cross-sectional cloud diagram is based on observed forms, heights obtained by range finder, and directions and velocities by 

 nephoscope. The arrows indicate direction of movement as if the top of the chart were north. The same applies to the arrows 

 for half-hourly wind direction, immediately below the cloud diagram. A zigzag arrow represents lightning, and a symbol some- 

 what like an "R" with such an arrow included represents a thunderstorm. The wind velocities are the 5-minute averages by 3-cup 

 anemometer. Pressure is from the record of a mercurial barograph, rainfall from a weighing rain gage, and temperature and 

 humidity from a thermohygrograph, all with open scales. 



This hurricane weather diagram for a storm with center passing nearby on the east is to be compared with a similar diagram for a 

 storm (1938) with center passing at some distance on the west. (See Ann. Rep. Smithsonian Inst, for 1939, p. 246, fig. 2.) 



676212 — 46 (Face p. 240) 



