RFC Overview
-
NWS Hydrology Mission:
- Provide river and flood forecasts and warnings for the protection of
lives and property.
- Provide basic hydrologic forecast
information for the nation’s environmental and economic well
being.
-
River Forecast Center Functions:
- Continuous hydrometeorological data assimilation, river basin modeling, and
hydrologic forecast
preparation.
-
Technical support and interaction with supported and supporting NWS
offices.
-
Technical support and interaction with outside water management agencies
and users.
- Applied
research, development, and technological implementation to facilitate
and support the above
functions.
Water Supply Forecasts
Historical Synopsis of Climate In
Water Resources Forecasting
(credit: Dave Brandon)
1917–Church,J.E. The first documented application to
forecasting using correlation of snowpack to water level in
Lake Tahoe
1943-USWB. Created bi-monthly 30-day weather Internal outlooks,
and went public in 1953.
1947-USWB/SCS. Started publishing seasonal water supply
outlooks.
1955-CBIAC Report. Evaluated use of 30-day outlooks in
forecasting Columbia Streamflow…potential could be great but
there was little/no skill.
1958-USWB. Created seasonal 90-day internal outlooks and went
public in 1974 (temp) and 1978 (precip).
1964-CBIAC. Follow-up Report Forecast skill improving but hard
to apply broad forecasts to specific basins.
1974-NWS. Seasonal 90-day temperature forecasts release to the
public followed by precipitation forecasts in 1978.
1976-Marron(NRCS). Began using SOI in forecasts for Lake Tahoe
1977-Schaake, J. (NWS). Used 30-day precipitation outlook to
remove a series of anti-analogs in ESP.
1987-Croley/Hartmann. Used climate outlooks subjectively to
alter ESP traces in forecasting Great Lake Levels.
1995-Rundquist, L. Developed ESP post weighting scheme.
1988-Perkins, T.(NRCS). Began using SOI as predictor in lower
Colorado.
1989-Cayan/Peterson. Investigated El Nino and western
streamflow
1994-Hartman, (NWS) Investigated using SOIs at CBRFC
1995-CPC. Begins issuing new climate format, with tercile
probability anomalies for 13 overlapping months.
1997-Mantua et al. Development of PDO
1997/1998-El Nino spurred variety of research
1998-Brandon, D. (NWS). Began using SOIs in preliminary
Outlooks issued in the fall.
2000-Perica, S. (NWS). Developed CPC pre-adjustment technique
to be used in NWSRFC ESP. |
Climate Requirements
-
Increased skill in medium to long range precipitation forecasts
- Castuccio et al (1981) estimated that a 6 percent improvement
in forecasting accuracy would produce $36.5 million in annual
benefits to agriculture and hydropower in the west
-
New methods for incorporating climate forecasts
- Must be based on data that is available when forecasts are made
-
New methods for incorporating and assimilating data into hydrologic forecasts.
-
Improving forecast verification to validate impact of climate forecasts
-
Expanding and improving use of water supply forecasts (including ensemble based decision support systems)
-
Longer term forecasts
(e.g. 2 year and beyond) – RFCs are increasingly being asked to
produce water supply outlooks for 2 years, sometimes even
longer.
-
Data – High quality,
long duration, high frequency records of precipitation,
streamflow, and temperature are necessary for calibration and
real-time operation.
A (partially) Successful Collaboration
2002-2004 CBRFC/CIRES/CDC
partnership to improve medium range forecasts
-
Incorporated probabilistic meteorological model output into ESP
-
Documented improvements in medium range streamflow forecasts (Werner et al, 2005)
-
Implemented in CBRFC operations
-
No direct national
implementation although concepts have helped drive national
software development
Elements of Successful Collaboration:
-
Focus on mutually
interesting problem:
- Directly address operational requirement(s).
- Also address relevant research question(s).
-
Early and active NWS
involvement: Must include both RFC or WFO and OHD as active
participants.
-
Proposed solutions
must be possible in real-time NWS forecasting environment.
Contact
Kevin Werner
|
|