NRCS National Water and Climate Center Update Tom Pagano 503 414 3010 Natural Resources Conservation Service.

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Presentation transcript:

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