Bulletin, Issue 42

12 hours 24 hours 30.20 and falling 34 feet adjacent air layers air currents air which flows altitude area of high Atlantic coast atmos atmospheric disturbances atmospheric pressure barometric pressure becomes cent central valleys clear clouds cold wave occurs dew point direction dust particles earth equal tempera falling rapidly falling slowly followed free air freezing gases getic Gulf heating and cooling high and low high-pressure area inch indications isobars large number low-pressure area lower air strata mercurial miles per hour moisture content Monthly Weather Review movement of translation movements and developments northeast northwest observation pass through points perature points of equal portion pressure areas quadrants radiation rain raindrops rapid rate of evaporation recurving regions relative humidity rising air saturated sea level season snow sometimes southern southwest storm temperature conditions thermal equator tube ture usually warm Weather Bureau weather forecasting weather map wind velocity winter zero