Entries show station weight (percent), station latitude (degrees N), station longitude (degrees E), and station name for each of the 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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