Sole Source:
The Hydrometeorological Design Studies Center (HDSC) within the Office of Hydrologic Development of NOAA's National Weather Service is updating precipitation frequency estimates for the following northeastern states: Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island, and Vermont. They will be published as a new volume of NOAA Atlas 14. In order to complete the spatial interpolation of point precipitation frequency estimates for various durations, HDSC requires spatially interpolated grids of mean annual maximum precipitation.
The contractor, The PRISM Climate Group at Oregon State University (OSU), will produce a series of mean annual maximum precipitation grids for selected durations using an optimized system based on the Parameter-elevation Regressions on Independent Slopes Model (PRISM) and HDSC-calculated mean annual maximum precipitation point estimates at gauged locations in the project area. For previous volumes of NOAA Atlas 14, this type of work has been performed by The PRISM Climate Group at Oregon State University (OSU).
The contractor will develop an optimized PRISM modeling system for the project area and use it to develop mean annual maximum precipitation grids for 17 selected durations between 15 minutes and 60 days. The work will be performed for the project area that includes northeastern states of Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island, and Vermont as well as a corridor extending 60-miles into neighboring states within the conterminous U.S. The proposed process is dynamic and has feedbacks. The process consists of two main phases. In the first phase, mean annual maximum precipitation grids will be derived for the project area for base durations of 60-minute, 12-hour, 24-hour and 10-day. In the second phase, grids of mean annual maxima will be derived for all durations. All delivered grids will be at a spatial resolution of 30-arc seconds (-800 meters).
PRISM is a unique tool available only from the PRISM Climate Group who have developed the skill and experience necessary for its operation. It is being used by a variety of Federal agencies. NOAA's National Climatic Data Center (NCDC) used it for generation of the maps of updated national climatic means. The Department of Agriculture's Natural Resources Conservation Service has extensively funded the development of this capability and uses it for mapping climate variables.
There are no known alternative existing combinations of skill and software. PRISM is extensively documented at http://www.prism.oregonstate.edu.