San Diego Precipitation Page

Los Angeles area station list

Entries show station weight (percent), station latitude (degrees N), station longitude (degrees E), and station name for each of the 20 stations in the index.

  1  0.66 34.148 -118.144 PASADENA           
  2  0.96 34.005 -118.414 CULVER CITY        
  3  1.26 33.938 -118.389 LOS ANGELES INTL AP
  4  1.45 34.182 -118.138 ALTADENA           
  5  1.68 34.106 -118.100 SAN GABRIEL FIRE DE
  6  1.86 34.051 -118.235 LOS ANGELES DWTN US
  7  2.68 33.812 -118.146 LONG BCH DAUGHERTY 
  8  2.92 33.602 -117.880 NEWPORT BEACH HARBO
  9  3.40 34.588 -118.094 PALMDALE           
 10  4.65 33.744 -117.867 SANTA ANA FIRE STN 
 11  5.59 34.705 -118.424 FAIRMONT           
 12  5.60 34.744 -118.724 SANDBERG           
 13  5.92 34.008 -118.490 SANTA MONICA PIER  
 14  6.42 34.053 -117.189 REDLANDS           
 15  6.62 33.951 -117.388 RIVERSIDE FIRE STN 
 16  8.29 34.833 -118.865 LEBEC              
 17  9.12 34.231 -118.071 MT WILSON CBS      
 18  9.18 34.426 -119.843 SANTA BARBARA MUNI 
 19 10.41 34.092 -117.881 COVINA CITY YRD FC3
 20 11.36 34.329 -118.401 PACOIMA DAM FC33A-E

The station weight is the product of two terms. 1) the fraction of area the station represents in the total area of interest. So, for example, a station that is located near to another station will have less influence on the final total, while a station that is far from any other station will have more influence. 2) The average annual precipitation at that station, so that a wet station contributes more to the final index that does a dry station. The final weight is the product of these two terms, normalized so that the sum of all the weights adds up to 100%.

Stations are selected based on two criteria. 1) They must have a relatively long (50 year or more) record with few interruptions. 2) They must be updated nearly every day by the California Nevada River Forecast Center.

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