NOUS41 KWBC 281958



Public Information Statement, Comment Request

National Weather Service Headquarters Washington DC

400 PM EDT Wed May 28 2014


To:      Subscribers:

         - Family of Services

         - NOAA Weather Wire Service

         - Emergency Managers Weather Information Network

         - NOAAPORT

         Other NWS partners and NWS employees


From:    Tim McClung

         Science Plans Branch Chief

         Office of Science and Technology


Subject: Soliciting Public Comments through July 30, 2014,

         on Experimental High-Resolution Model Output

         Statistics (HRMOS) Probabilistic Quantitative

         Precipitation Forecast (PQPF) Guidance


Through July 30, 2014, NWS is seeking user feedback on the

experimental Global Forecast System (GFS)-based High

Resolution Gridded Model Output Statistics (HRMOS)

probabilistic quantitative precipitation forecast (PQPF)



The experimental HRMOS PQPF guidance provides gridded

probabilities for multiple precipitation exceedance

thresholds for 6- and 12-h periods in the 12-156 h range

over the continental United States.  Predicted precipitation

amounts are for 4-km square boxes of the 4-km Hydrologic

Rainfall Analysis Project (HRAP) grid, which is Polar

Stereographic. PQPFs on this grid are interpolated to the

CONUS 2.5 km National Digital Forecast Database (NDFD) grid,

which is Lambert Conformal Conic, for dissemination.  For

the 6-h periods, the precipitation exceedance thresholds are

0.10. 0.25, 0.50, 0.75, 1.00 and 2.00 inch and greater; for

the 12-h periods 3.00 inch and greater is an additional



The enhanced spatial resolution of HRMOS PQPFs results from

application of archived Stage IV quantitative precipitation

estimates and high resolution precipitation climatology and

topography data. Dynamic interaction of the climo-

topographic data with GFS model output predictors results in

enhanced spatial resolution in the HRMOS PQPFs. Further

information about this experimental guidance is online at:


which contains links to graphical PQPF maps


downloadable GRIB2 files




and a user feedback form


which users are encouraged to complete.


If you have technical comments or questions, please contact:


Dr. Jerome Charba

National Weather Service

Meteorological Development Laboratory

301 713-1772 x179


Frederick Samplatsky

National Weather Service

Meteorological Development Laboratory

301 713-0224 x105


National Public Information Statements are online at: