Simplified spectral forecasts of sea and swell waves by graphical means
Czaja, Bernard F.
Stevenson, Donald W.
MetadataShow full item record
The spectral method of sea and swell wave forecasting yields more meaningful results than do other forecasting methods. To shorten the time required to make such a forecast the authors used high-speed computer methods and the Piers on-Neumann-James spectra to make spectral forecasts and display the results in graphic form for several synoptic weather models and a wide range of wind and fetch speeds. Forecasts were completed for a stationary fetch model, a fetch moving to leeward and a fetch moving to windward . Computations were made with the assumptions that a rectangular generating area could be delineated; that a spatially-uniform mean wind existed; that this wind did not increase or decrease until the time of forecast; and finally that if the fetch were moving, its movement was steady. The following parameter limits were established: a. wind speeds, 15 to 55 knots; b. speed of the generating area, 15 knots to and including the wind speed ; c. forecast times, 6 to 72 hours. Results of the forecasts are plotted on approximately 250 graphs which show the geographic distribution of spectral sea or swell components relative to the fetch at forecast times.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Bacon, A. Ben (Monterey, California. Naval Postgraduate School, 1989-06);The lagged-averaged forecast (LAF) technique applied to tropical cyclone track prediction is a weighted sum of recent forecasts that were started from initial conditions at various times lagging the start of the forecast ...
Application of the Navy's numerical hurricane and typhoon forecast scheme to 1967 Atlantic tropical-storm data Renard, Robert Joseph (Monterey, California. Naval Postgraduate School, 1969-03-15); NPS-51RD9031ARenard recently reported on a numerical scheme for predicting the motion of tropical storms for intervals up to 72 hours. The forecast technique is applied in two steps. First, numerical geostrophic steering of the cyclone ...
The impacts of weather forecasts on military operations a system for conducting quantitative near-real time analyses Butler, Mark D. (Monterey, California. Naval Postgraduate School, 2005-09);We have developed, tested, and operationally implemented a web based system for collecting and analyzing in nearreal time weather forecast and observational data to assess: (a) the performance of forecasts; and (b) the ...