ABSTRACT 



This paper presents the results of data analyses for 25 precipitation 

 intensity stations on two study areas in central and north-central Utah 

 located at elevations between 4, 350 and 10, 150 feet m.s.l. All data were 

 collected during the period May 1 to October 31. Each station has 10 or 

 more years of recoi'd; one station has 30 years of record. The following 

 analyses were made: (1) Record consistency; (2) definition of local precipi- 

 tation zones; (3) intensity-duration-frequencj' characteristics; (4) 24-hour 

 depths; (5) monthly depths and number of storms; (6) storm occurrence by 

 hour of the day; and (7) storm occurrence by storm duration. The precipi- 

 tation zone between 6,500 and 8,000 feet m.s.l. is expected to receive the 

 greatest rainfall intensities. There is a trend toward reduced intensities 

 with increasing elevation but the trend is not uniform. However, those pre- 

 cipitation zones that receive the most intense rainfall do not coincide with 

 those zones receiving the greatest depth of rainfall. Generally, rainfall 

 depth increases with elevation, but on one study area the zone that received 

 the greatest depth was not the highest elevation zone. A marked difference 

 in the distribution of storm occurrence by hour between the two study areas 

 is attributed to differences in storm tj^e and to differences in the principal 

 source of summer moisture. Average storm length varies inversely with 

 elevation. 



