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 6.42 39.583 -120.371 SIERRAVILLE RS 2 8.42 41.321 -122.308 MT SHASTA 3 9.91 39.937 -120.948 QUINCY 4 12.43 38.758 -120.503 PACIFIC HOUSE 5 13.27 40.346 -121.609 MINERAL 6 15.49 40.714 -122.416 SHASTA DAM 7 15.94 39.278 -120.710 BLUE CANYON NYACK A 8 18.12 39.695 -121.345 BRUSH CREEK RS
The station weight is based on 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 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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