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395
NOUS41 KWBC 011924
PNSWSH

Technical Implementation Notice 14-39
National Weather Service Headquarters Washington DC
325 PM EDT Wed Oct 1 2014

TO:      Subscribers:
         -Family of Services
         -NOAA Weather Wire Service
         -Emergency Managers Weather Information Network
         -NOAAPORT
         Other NWS Partners and NWS employees

FROM:    David Novak
         Acting Director, Weather Prediction Center

SUBJECT: Downscaling WPC Day 3-7 Gridded Probability of
         Precipitation Forecasts Effective November 12, 2014

Effective Wednesday, November 12, 2014, at 1500 Coordinated
Universal Time (UTC), the National Centers for Environmental
Predictions (NCEP) Weather Prediction Center (WPC) will apply
downscaling to the Day 3-7 gridded probability of precipitation
products. The downscaling is done by applying a downscale factor
derived by dividing the PRISM model value at 111 km resolution by
the PRISM model value at 2.5 km resolution.

More information on PRISM is found at:

http://www.prism.oregonstate.edu/

An example of the resulting field is shown at:

www.wpc.ncep.noaa.gov/5km_grids/newpop

These changes are being made to meet National Digital Forecast
Database requirements.

There are no header changes, distribution changes or substantial
file size changes.

For more information, please contact:

  David.Novak@noaa.gov
  301-683-1484

National Technical Implementation Notices are online at:

  http://www.weather.gov/os/notif.htm

$$



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