BUREAU OF METEOROLOGY

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1 BUREAU OF METEOROLOGY Building an Operational National Seasonal Streamflow Forecasting Service for Australia progress to-date and future plans Dr Narendra Kumar Tuteja Manager Extended Hydrological Prediction 15 October 2014

2 Built on extensive research partnerships Bureau of Meteorology Water Information Program Centre for Australian Weather and Climate Research (CAWCR) CSIRO Water Information Research and Development Alliance (WIRADA) University sector ewater WIRADA

3 Australia has a variable climate Year Major drought conditions Federation drought Widespread drought; Australian wheat crop failed Severe drought across all states WWII drought affects SE & SW Most of Australia affected A short severe drought Millennium drought 2013-present Parts of NSW and Queensland Rainfall deficiency during 1902 drought EIGHT DROUGHT EVENTS OF SHORT AND EXTREME TO PROLONGED CONDITIONS DURING THE LAST 100 YEARS

4 Water information program ( Legislative backing Water Act year program began in July 2007 Services: o Water data, accounts & assessments o Water forecasts

5 Water availability forecasts Perspective Situational awareness Foresight PAST PRESENT FUTURE DECADES YEARS WEEKS DAYS DAYS WEEKS YEARS DECADES Long-term Seasonal Flood & short-term

6 Water planning and annual allocation considerations Extreme dry years Extended sequence of dry years Water allocation rationale In storage Water already consumed Min flow for rest of the year Worst case losses for rest of the year In , water supplies across many areas could not be guaranteed

7 Seasonal streamflow forecasting service Forecasts of streamflow volumes at a site or total inflows to a water storage 3-months ahead, updated every month, since locations in 32 river basins Statistical approach using Bayesian Joint Probability model (5000 ensembles) Publicly available at

8 A range of data and forecast products Exceedance probabilities Tercile forecasts Probability distributions Tercile maps Box plots

9 Seasonal Streamflow Forecasting Approach POAMA Global Climate Model Rainfall, Streamflow Data Atmosphere, Sea Surface Monitoring Data Registered User Release: Nov 14 (Dynamic) Rainfall Downscaling Publicly available (Statistical) Dynamic Models Statistical Models Merging Probabilistic Forecast of Streamflow Monthly and 3 Monthly Registered User Release: July 15 (Merged)

10 The Bayesian joint probability (BJP) model Wang, Robertson and Chiew (2009) Water Resources Research Wang and Robertson (2011) Water Resources Research Robertson and Wang (2012) Journal of Hydrometeorology Robertson, Pokhrel and Wang (2013) Hydrology and Earth System Sciences Robertson and Wang (2013) Water Resources Management Pokhrel, Wang and Robertson (2013) Water Resources research Bennett, Wang, Pokhrel and Robertson (2014) Natural Hazards and Earth System Sciences

11 Dynamic Approach: Rainfall Downscaling POAMA forecast of climate indices (~270km) Analogue downscaling (5 replicates of 31 ensembles) Downscaled rainfall (5km; 155 ensembles) Timbal, B., Li, Z., & Fernandez, E. (2008). The Bureau of meteorology statistical downscaling model graphical user interface: user manual and software documentation. Shao, Q., & Li, M. (2013). An improved statistical analogue downscaling procedure for seasonal precipitation forecast. Stochastic Environmental Research and Risk

12 Dynamic Approach: hydrologic modelling Post-processed catchment rainfall forecasts Hydrologic uncertainty (BATEA) (40 replicates of GR4J model) Post-processed streamflow (6200 ensembles) Mean wet day rainfall 1 month & 3 month forecasts Timbal, B., Li, Z., & Fernandez, E. (2008). The Bureau of meteorology statistical downscaling model graphical user interface: user manual and software documentation. Shao, Q., & Li, M. (2013). An improved statistical analogue downscaling procedure for seasonal precipitation forecast. Stochastic Environmental Research and Risk

13 Forecast verification and communication of forecast uncertainty is important

14 Rigorous cross-validation scheme

15 Forecast reliability Probability Integral Transform (PIT) Plots FORECAST RELIABILITY IS IMPORTANT FOR END USER CONFIDENCE

16 Forecast accuracy Skill score: CRPS, RMSE & RMSEP Hit rate: Tercile hit rate for low & high flows Precision: Inter quantile range (10%,90%) FORECAST RELIABILITY IS IMPORTANT FOR END USER CONFIDENCE

17 Aggregated forecast performance (cross-validation)

18 Modelling system (WAFARi) Statistical, dynamic, and merging in a modelling system Model Kernels BJP (statistical) User Interface Tools Automated Workflows Modular structure WAPABA Data I/O Forecast Verification Calibrate Interactive simulation Powerful scripting capability Self-descriptive file formats Rainfall- Runoff Models BATEA (predictive uncertainty) QMA Merging Rainfall Downscale Catchment Forecast Posterior Error Processing Forecast Report Forecast Merging Forecast Cross- Validate Tailored graphic tools Parallel computing for cross-validation Downscaled Rainfall Forecasts WISKI/AWRIS, AIFS, Direct report I/O EHP System Libraries FCVF Verification Stats Graphic ARMA

19 Communication and adoption Over 1600 subscribers Online survey conducted in Nov % of the key stakeholders expressed satisfaction with the SSF service Development of case studies with water managers Monthly National Climate and Water Briefings Forecasts included in monthly outlook video

20 Concluding remarks The millennium drought ( ) and significant floods in the last 5 years have shaped the water reform agenda in Australia The need for water availability forecasts at a range of time scales was established through an extensive user needs analysis Engaging with stakeholders meaningfully, establishing R&D alliances and transitioning research to operations is not trivial Making the right technology choices is critical for development and delivery of operational forecasting services; QA/QC tasks are very demanding Communication of forecast uncertainty and performance is indeed difficult Influencing decision making by water resource managers requires ongoing engagement throughout all stages planning, development and delivery

21 Thank you Narendra Kumar Tuteja Manager Extended Hydrological Prediction

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