The National Weather Service in San Juan announced Wednesday that increasing winds and a northerly swell spreading across the local waters will maintain hazardous marine conditions through at least the weekend. NWS said the resulting breaking waves will cause life-threatening rip currents during the next several days. In addition, the remnants of an old frontal boundary will be moving just north of the local islands and, in combination with favorable weather conditions, will enhance the potential for showers across the region and isolated thunderstorm development in the interior and western Puerto Rico each afternoon. According to the forecast, at this time the threat level of life-threatening rip currents is high, while the threat level for flooding and hazardous seas is moderate. Potential Hazards and Impacts Marine: Building seas up to…