NRCS National Water and Climate Center Update Tom Pagano Natural Resources Conservation Service
Graphical Products (GIS) Daily Update Guidance Forecasts
NRCS Webpage Circa 2001 until Sept 2006(!)
Design principles Rich context in neutral colors Data emphasized without being ham-fisted Still usable in black and white Completely annotated NRCS Webpage 2007
Snow
Apr
Water Year Precipitation Percentile
Combined NRCS/NWS plots (using ACIS data)
Where to get maps: To get actual data files
Daily Forecast Updates Currently, forecasts produced 1x per month using monthly data. With a simulation model (e.g. ESP) can be run more frequently but is resource intensive.
Daily Forecast Updates Daily SNOTEL data exists for 20+ years. Statistical forecast techniques are cheap/easy. Why not develop 365 forecast equations/year?
Daily Forecast Updates Daily SNOTEL data exists for 20+ years. Statistical forecast techniques are cheap/easy. Why not develop 365 forecast equations/year? Developed Excel application to calibrate daily forecasts (1.5 mins) and run them on a scheduler (10 sec)
Automated logic of choosing predictors
Three big problems in water supply forecasting: 1.Intercorrelated predictors 2.Varying periods of record 3.Missing realtime data
Z-Score Regression (Pagano 2004) Prevents compensating regression coefficients. Aggregates like predictors, emphasizing best ones. Does not require serial completeness. Relative contribution of predictors Three big problems in water supply forecasting: 1.Intercorrelated predictors 2.Varying periods of record 3.Missing realtime data Pagano, T. C. 2004: My dissertation. University of Arizona, Tucson, Department of hydrology and water resources
avg Period of record median Period of record range (10,30,70,90 percentile)
avg Period of record median Period of record range (10,30,70,90 percentile) Official coordinated outlooks
avg Period of record median Period of record range (10,30,70,90 percentile) Official coordinated outlooks Daily Update Forecasts
Official forecasts
Daily forecast 50% exceedence Official forecasts Expected skill
Calibration dataset of today’s equation Current forecast
Sept 30
May 1
obs
Courtesy Randal Wortman Army Corps 6% avg error
wsf/daily_forecasts.html If you want more forecasts in your area: Contact your NRCS Snow Survey Data Collection Officers and/or Water Supply Specialists