Refractivity happens due to stratification in the lower boundary layer over oceans due to variability of moisture, temperature, wind and sea surface temperature which collectively may lead to generate evaporation duct. The evaporation duct has a significant impact on the spread of electromagnetic waves in the atmosphere over oceans. So it is of great significance to analyze and forecast evaporation duct based on the actual atmospheric and marine environmental data both from the meteorological and military point of view. This ducting sometimes support normal propagation of radar signals and...