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 0.02 34.148 -118.144 PASADENA 2 0.03 32.700 -117.200 NORTH ISLAND NAS 3 0.03 34.005 -118.414 CULVER CITY 4 0.04 33.938 -118.389 LOS ANGELES INTL AP 5 0.05 34.182 -118.138 ALTADENA 6 0.05 34.106 -118.100 SAN GABRIEL FIRE DE 7 0.06 34.051 -118.235 LOS ANGELES DWTN US 8 0.07 32.767 -115.562 EL CENTRO 2 SSW 9 0.07 37.771 -122.427 SAN FRANCISCO DWTN 10 0.09 33.812 -118.146 LONG BCH DAUGHERTY 11 0.09 33.602 -117.880 NEWPORT BEACH HARBO 12 0.11 33.628 -116.160 THERMAL FCWOS 13 0.12 33.231 -116.414 BORREGO DESERT PARK 14 0.13 32.734 -117.183 SAN DIEGO WSO AP 15 0.15 33.744 -117.867 SANTA ANA FIRE STN 16 0.16 33.571 -116.077 MECCA FIRE STN 17 0.17 32.849 -115.567 IMPERIAL 18 0.19 34.744 -118.724 SANDBERG 19 0.19 34.008 -118.490 SANTA MONICA PIER 20 0.20 33.210 -117.395 OCEANSIDE MARINA 21 0.21 36.997 -119.707 FRIANT GOVERNMENT C 22 0.22 37.477 -122.239 REDWOOD CITY 23 0.26 37.889 -121.226 STOCKTON AP 24 0.26 33.951 -117.388 RIVERSIDE FIRE STN 25 0.26 39.091 -120.948 COLFAX 26 0.26 33.619 -114.714 BLYTHE ASOS 27 0.27 33.828 -116.510 PALM SPRINGS 28 0.28 37.874 -122.261 BERKELEY 29 0.29 34.231 -118.071 MT WILSON CBS 30 0.30 39.389 -120.094 BOCA 31 0.31 36.780 -119.719 FRESNO YOSEMITE INT 32 0.34 34.092 -117.881 COVINA CITY YRD FC3 33 0.34 37.692 -121.769 LIVERMORE 34 0.35 33.237 -116.761 HENSHAW DAM 35 0.37 34.329 -118.401 PACOIMA DAM FC33A-E 36 0.39 39.010 -120.845 FORESTHILL RANGER S 37 0.39 37.999 -121.318 STOCKTON FIRE STA 4 38 0.41 41.796 -124.215 CRESCENT CITY 3 NNW 39 0.43 33.757 -116.707 IDYLLWILD FIRE DEPT 40 0.44 35.628 -120.686 PASO ROBLES 41 0.47 37.406 -122.048 MOFFETT FEDERAL AIR 42 0.48 36.954 -120.038 MADERA 43 0.48 39.806 -120.186 VINTON 44 0.50 37.624 -120.951 MODESTO AP 45 0.50 34.588 -118.094 PALMDALE 46 0.52 37.879 -121.930 MT DIABLO JUNCTION 47 0.53 38.556 -121.417 SACRAMENTO 5ESE 48 0.54 34.767 -114.619 NEEDLES AP 49 0.54 37.286 -120.512 MERCED 50 0.55 36.664 -121.608 SALINAS AP 51 0.55 38.507 -121.495 SACRAMENTO AP ASOS 52 0.55 38.933 -120.801 GEORGETOWN RS 53 0.58 39.805 -120.472 PORTOLA 54 0.58 34.053 -117.189 REDLANDS 55 0.60 33.378 -116.840 PALOMAR MTN OBSVTRY 56 0.60 40.458 -121.866 VOLTA PH 57 0.61 37.585 -120.267 EXCHEQUER DAM 58 0.64 34.833 -118.865 LEBEC 59 0.65 34.705 -118.424 FAIRMONT 60 0.70 36.316 -119.637 HANFORD 1 S 61 0.72 37.957 -122.544 KENTFIELD 62 0.77 35.434 -119.054 BAKERSFIELD AP 63 0.83 39.168 -120.143 TAHOE CITY 64 0.85 35.670 -120.628 PASO ROBLES MUNI AP 65 0.87 40.346 -121.609 MINERAL 66 0.89 35.160 -120.683 PISMO BEACH 67 0.90 36.247 -121.780 BIG SUR STN 68 0.94 37.967 -120.387 SONORA 69 0.98 38.907 -121.084 AUBURN 70 1.04 34.426 -119.843 SANTA BARBARA MUNI 71 1.07 37.371 -118.358 BISHOP AP 72 1.12 39.247 -121.001 NEVADA CITY 73 1.15 39.691 -121.821 CHICO UNIV FARM 74 1.17 34.854 -116.786 DAGGETT AP 75 1.20 36.482 -121.182 PINNACLES NM 76 1.23 39.563 -120.824 DOWNIEVILLE 77 1.26 40.152 -122.254 RED BLUFF MUNI AP 78 1.35 32.990 -116.587 CUYAMACA 79 1.39 38.431 -122.865 GRATON 80 1.42 39.872 -121.611 DE SABLA 81 1.63 37.233 -119.510 NORTH FORK RS 82 1.76 40.541 -121.577 MANZANITA LAKE 83 1.79 39.586 -122.534 STONY GORGE RSVR 84 1.81 38.758 -120.503 PACIFIC HOUSE 85 1.92 39.563 -121.108 STRAWBERRY VALLEY 86 2.04 41.493 -120.553 ALTURAS 87 2.44 40.170 -121.088 CANYON DAM 88 2.52 38.573 -122.441 ANGWIN PAC UNION CO 89 3.27 41.845 -123.965 GASQUET RS 90 3.30 38.277 -120.311 CALAVERAS BIG TREES 91 3.37 37.750 -119.590 YOSEMITE PARK HQ 92 4.01 39.147 -123.210 UKIAH 93 4.87 36.491 -118.825 ASH MTN 94 5.39 40.714 -122.416 SHASTA DAM 95 9.30 41.309 -123.532 ORLEANS 96 9.89 40.987 -121.977 PIT RIVER PH 5
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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