Abstract: Mean monthly values of precipitable water were related to mean monthly values of surface dew point for 15 stations distributed over the continental United States. The degree of relationship was excellent, and a regression ...

Abstract: Trends in cyclone frequencies over North America were determined for the period 1949?76 for four mid-season months. The general trend has been for a decrease in the number of cyclonic events, but with fluctuations. There ...

Abstract: The mean frequency of cyclonic events for North America is determined for five months based on the 20-year period, 1951?1970. Monthly maps are used to present the data and display the distribution of cyclonic frequencies. ...

Abstract: Mean monthly values of precipitable water have been computed for radiosonde stations in the United States for the period 1946?56. The individual monthly values and an elementary statistical analysis are presented for 52 ...

Abstract: The concentrations of salt particles over central Illinois are being monitored through the use of a sodium flame-counter and an impactor. The number of large particles as determined by the impactor has been found to average ...

Abstract: Probabilities of setting record daily low temperatures during the winter half-year were determined empirically for selected stations in the upper Midwest. The probability of a new record low depends upon the length of ...