National Weather Service United States Department of Commerce

Heavy Rain and Mountain Snow For the West Coast; Lake Effect Snow in the Great Lakes

A series of Pacific storms will deliver multiple rounds of heavy rain and mountain snow Wednesday into the Thanksgiving holiday weekend. There is an elevated concern for flash flooding, mudslides and debris flows near wildfire burn scars in California. A weak storm system will cross the Great Lakes Wednesday with accumulating Lake Effect snow. Read More >

Full Domain Shown Below:  

Wave Height
Wave Height - click to enlarge
Wave Period
Wave Period - click to enlarge
Swell
Swell - click to enlarge
Wind
Wind - click to enlarge
Water Level
Water Level - click to enlarge

Delaware Bay Domain Shown Below:  

Wave Height
Wave Height - click to enlarge
Wave Period
Wave Period - click to enlarge
Swell
Swell - click to enlarge
Wind
Wind - click to enlarge
Water Level
Water Level - click to enlarge

   

These models forecasts are produced by WFO Mount Holly, NJ, using the NWPS wave models and the Real Time Ocean Forecast System.


The NWPS output is used as guidance to produce WFO Mount Holly. It is only experimental and it may differ from the official forecast.  For the official marine forecast  graphics go to:  WFO PHI Official Marine Forecast Graphics.

NWPS accounts for the following physics:

  • Wave propagation in time and space, shoaling, refraction due to current and depth, frequency shifting due to currents and non-stationary depth.
  • Wave generation by wind.
  • Three- and four-wave interactions.
  • Whitecapping, bottom friction and depth-induced breaking.
  • Dissipation.
  • Wave-induced set-up.
  • Propagation from laboratory up to global scales.
  • Transmission through and reflection (specular and diffuse) against obstacles.
  • Diffraction.

In here you will see 3-hourly forecast outputs for significant wave height, peak wave direction, peak wave period, and significant swell height (heights in feet and periods in seconds).  Our local version of NWPS also uses input from WAVEWATCH III for boundary conditions.

NOTE:  Significant Swell Height output from NWPS is the average height of the highest 1/3 of the group of waves with periods of 10 secs or longer.