National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

AHPS - Advanced Hydrologic Prediction Services

The Advanced Hydrologic Prediction Services is an initiative from the National Weather Service to provide longer term hydrologic outlooks to the various users of hydrologic information, such as local emergency management officials, reservoir operators, and other water resources managers. The format of the products tends to be graphical in nature, as opposed to the text-based products generally issued for current forecast products. The data in the products tend to be probabilistic in nature, based on analysis of historic precipitation, temperature and streamflow, current river and basin conditions, and short-term meteorologic outlook.


HEFS Trace Analysis - "Create Your Own Product"

The HEFS Trace Analysis interface provides great flexibility in deriving products and information from the available ensemble streamflow traces. Please select from the topics in the table below to learn more about HEFS Trace Analysis and how to use the "create your own product" interface.

Topic Description
General Ensemble Theory for Streamflow Forecasts A very general overview of HEFS
HEFS Trace Analysis - Making Selections and Interpreting Results Specific instructions on how to "create your own product" and intrepret the results
HEFS - A Few Words of Caution A review of the current limitations of HEFS as interpreted at the CNRFC

To create your own product go directly to the HEFS Trace Analysis Interface