Table 2 CHIRPS-GEFS Precipitation Forecasts: Data Update Schedule.

From: Advancing early warning capabilities with CHIRPS-compatible NCEP GEFS precipitation forecasts

Forecast period

Update schedule

Variable

1-day, 5-day, 10-day, 15-day

Daily

Total

5-day, 10-day, 15-day

Daily

Anomaly and SPI

Dekad “First” forecast

16 days before the dekad ends

Total, Anomaly, and SPI

Dekad “Last” forecast

1st, 11th, 21st day of the month

Total, Anomaly, and SPI

Pentad “First,” “Second,” and “Last” forecasts

1st, 6th, 11th, 16th, 21st, 26th day of the month

Total

  1. Forecast precipitation totals are provided for multiple periods to support applications. Precipitation totals and anomalies are in mm; standardized precipitation index (SPI) values are in number of standard deviations from the mean (z score). Anomalies and SPI are, at present, computed from all available years.