NOUS41 KWBC 252115



Service Change Notice 11-13

National Weather Service Headquarters Washington DC

415 PM EDT Fri Feb 25 2011


To:       Subscribers:

          -Family of Services

          -NOAA Weather Wire Service

          -Emergency Managers Weather Information Network


          Other NWS Partners and NWS employees


From:     James E. Hoke

          Director Hydrometeorological Prediction Center


Subject:  Transition of NCEP HPC Probabilistic Quantitative
          Precipitation Forecasts From Experimental to
          Operational Effective April 5, 2011

Effective April 5, 2011, the National Centers for Environmental Prediction’s (NCEP) Hydrometeorological Prediction Center (HPC) will begin issuing probabilistic quantitative precipitation forecasts (PQPFs) over the continental U.S. in 6 hour increments out to 3 days. The PQPF forecasts provide information in two different forms: probabilities of exceeding a threshold and levels of precipitation amount associated with a given percentile in the distribution.


The PQPF products are available online at:


If you have questions or feedback, please contact:


    Ed Danaher

    Chief, HPC Development and Training Branch

    Camp Springs, MD 20746

    (301) 763-8000, ext. 7354


National Service Change Notices are online at: