San Juan (P.R.)-Maps, Manuscript-Early works to 1800 Tools and information for emergency responders and planners, and others concerned about the effects of oil and hazardous chemicals in our waters and along our coasts. The Weather Channel: San Juan, Puerto RicoД¬urrent conditions and forecasts for San Juan, PR. To find wind speed and direction in the San Juan area, choose вЂњSan JuanвЂќ from the вЂњForecasts, watches, and warningsвЂќ menu, then click the link вЂњArea Conditions for San Juan and North Sections of Puerto Rico, PR.вЂќ Internet Weather Source (IWS) Puerto Rico WeatherДЇorecasts, watches, warnings, and the most recently observed weather conditions for locations throughout Puerto Rico.

Weather conditions and forecasts for San Juan, PR. San Juan National Weather Service Forecast OfficeД¬lick вЂњSan JuanвЂќ on the map to view current weather and forecasts. Atlantic Coast: Gulf of Mexico, Puerto Rico, and Virgin Islands. Department of Commerce, National Oceanic and Atmospheric Administration, National Ocean Service. The result was 0.1-knot (0.05 m/s) surface currents at the Punta del Morro station. The tidal currents were simulated by scaling the time derivative of the sea level height by an estimate of the volume transport. Since tidal harmonics are not available for the area, the tidal height station of Punta del Morro was used. Observations of the spatial and temporal variations of the surface currents in the harbor were unavailable. Coast Pilot indicates a mean tidal range of 1.1 feet however, the wind is known to significantly alter the water level. The CATS Streamfunction Analysis for Currents (SAC) hydrodynamic model was used to generate the tidally driven surface currents in San Juan harbor.

Surface currents during the grounding were approximately 1/3 knot. Data were not available for the spatial variability of the nearshore surface currents around San Juan, so the current pattern was scaled from observations made during the Berman Barge grounding in 1994. This change in sea level was simulated in the Current Analysis for Trajectory Simulations (CATS) Diagnostic Analysis for Currents (DAC) hydrodynamic model. In the nearshore area, the westward drift was assumed to result from a barotropic setdown. The tidal current pattern represents the tidally driven currents in San Juan harbor. The offshore current pattern represents the large- scale westward wind drift currents and the net transport through the coral reef systems. The circulation in the vicinity of San Juan is simulated with two current patterns: offshore and tidal currents. Longshore currents generated by high winds are not simulated in this Location File. Hurricanes and tropical storms generally bring strong northerly to northeasterly winds, creating heavy sea and breakers at the entrance to San Juan harbor. Neither the land/sea breeze phenomena, nor its effects on nearshore circulation, were simulated in the San Juan Location File. Locally, winds are controlled by land/sea breeze winds blow onshore during daylight hours, changing to blow offshore after sunset. Due to the intricate structure of the reef systems, the fine scale circulation within them was not simulated in this Location File.Д®asterly trade winds with a daily land/sea breeze superimposed are the common wind circulation pattern in the San Juan area. Extensive reef systems are found within San Juan harbor and along the outer coastline, where the surface currents are highly variable, both spatially and temporally.

Within this Location File, large-scale, wind-driven currents are simulated offshore, and tidally forced currents are simulated for San Juan harbor. The currents along the northern shore of Puerto Rico are part of the westward drift caused by the easterly trade winds. It is protected on the north by the relatively high land of Isla San Juan, and on the south, east, and west by the adjacent low mangrove swamps of the Puerto Rico mainland. San Juan is the only harbor on the north coast that affords protection in all weather. Caribbean shipping is centered around the harbor because it is the second largest sea port in the area (New York City is the largest) (Blue Water Maritime, ). San Juan, Puerto Rico is one of the best natural harbors in the Caribbean, and is the second oldest city in the Americas.

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