What's new at PRISM
Calendar of PRISM Data Updates

PRISM grids are modeled multiple times after a day has ended to accommodate data reporting and quality control schedules from various station networks. The first model run for a particular day ending at 12 GMT is made about 24 hours later. A second run is made after five days have elapsed, with additional runs after approximately one, two, three, four, five and six months, for a total of eight model runs. After six months, most stations have reported data and undergone quality control checks. The eighth model run is therefore considered “final,” until the time series dataset undergoes a major revision.

PRISM grids are modeled multiple times after a month has ended to accommodate data reporting and quality control schedules from various station networks. The first model run for a particular month is made on the first day of the following month. The second through seventh runs, which include visual inspection of the maps and data quality assessment by a trained analyst, are completed by about the 15th of each month, out to six months. After six months, most stations have reported and undergone quality control checks. The seventh model run is therefore considered “final,” until the time series dataset undergoes a major revision.