Potomac River - Calvert Bay Wind ForecastUnited StatesMDSt Marys CountyPotomac River - Calvert Bay1-Day3-Day5-Day Graph Plots Open in Graphs Wind Forecast NOAAWind Real-Time Potomac River - Calvert Bay wind forecast issued yesterday at 10:31 pm. Next forecast at approx. 10:31 am.Get WillyWeather+ to remove ads