Southern Puerto Rico out 10nm Marine Forecast
| Rest Of Tonight...Northeast Winds 5 To 10 Knots. Seas 1 To 3 Feet. Dominant Period 7 Seconds. Isolated Showers. |
| Friday...Northeast Winds 5 To 10 Knots, Becoming East In The Afternoon. Seas Around 2 Feet Or Less. Dominant Period 7 Seconds. Isolated Showers. |
| Friday Night...Northeast Winds 5 To 10 Knots. Seas Around 2 Feet Or Less. Dominant Period 7 Seconds. Isolated Showers. |
| Saturday...Northeast Winds 10 To 15 Knots, Becoming East With Gusts Up To 25 Knots In The Afternoon. Seas 1 To 3 Feet. Dominant Period 7 Seconds. Isolated Showers. |
| Saturday Night...Northeast Winds 10 To 15 Knots. Seas 1 To 3 Feet. Dominant Period 6 Seconds. Scattered Showers. |
| Sunday...East Winds 10 To 15 Knots. Gusts Up To 25 Knots. Seas 1 To 3 Feet. Dominant Period 6 Seconds. Isolated Showers. |
| Monday...East Winds 5 To 10 Knots. Seas 1 To 3 Feet. Dominant Period 6 Seconds. Isolated Showers. |
| Tuesday...East Winds 10 To 15 Knots. Seas 1 To 3 Feet. Dominant Period 6 Seconds. Isolated Showers. |
| Area Forecast Discussion National Weather Service San Juan PR 433pm AST Thu April 18 2024 Synopsis Moderate to heavy showers will continue across the the southern and eastern portions of Puerto Rico through the early evening hours. This may result in additional flooding and mudslides in steep terrain along the Cordillera Central. Weather conditions will slowly improve tonight into Friday as a mass of drier air filter into the region. A surface high-pressure migrating from the western Atlantic to the Central Atlantic will promote mostly fair conditions with showers in the afternoon hours. .SHORT TERM...Tonight through Saturday... Mainly fair weather conditions prevailed during the morning hours across the local islands under partly cloudy skies. As the day progressed, cloudiness began to increase along the Cordillera Central and the southern slopes of Puerto Rico. Locally heavy showers were observed from Yauco to Orocovis, and from Barranquitas to Humacao. Doppler radar estimated rainfall accumulations between 2 to 4 inches of rain across the mentioned areas. Flood Advisories (FLS) were issued, due to minor flooding, ponding of water in low drainage areas and the potential for mudslides. Daytime temperatures were observed in the low to mid 80s across Puerto Rico and the U.S. Virgin Islands. Winds were light to moderate from the northeast with higher gusts. The shower activity is expected to prevail until the early evening hours, and the majority of the activity will diminish around sunset. Despite of the shower activity staying mostly across central and southern Puerto Rico, the northern and northeastern municipalities may observe late convection later this afternoon. By tonight into Friday weather conditions will improve. However, passing showers cannot be ruled out across the windward portions of the islands. As the upper level trough moves away from the area, a building high pressure in the western Atlantic will promote winds from the NNE. A mass of drier air will slowly filter into the area, limiting the shower formation from Friday into Saturday. Nonetheless, due to daytime heating and local effects, shower activity is possible across the central and southwestern areas of Puerto Rico during the afternoon hours. The U.S. Virgin Islands will observe mainly fair weather conditions through the weekend. Overall, nighttime t temperatures will stay in the upper 60s across the higher elevations, and in the mid 70s across the coastal and urban areas of the islands. Long Term Sunday through Thursday... /Issued 510am AST April 18 2024/ A surface high-pressure building north of the islands, promoting an advective pattern, will bring occasional moisture surges across the USVI and PR from Sunday onward. The winds will persist mainly from the east to east-northeast, which may result in the areas affected by passing showers being the islands' north and east windward sections, especially during the night and morning hours. These showers will bring periods of moderate to locally heavy rains at times. The afternoon convection will be driven mainly by local effects, diurnal heating, and sea breeze variations across the interior and western sections daily. Additionally, the latest model guidance suggests maximum temperatures near the normal climatological values during the long term. Around mid-week, an upper-level trough will approach from the west, increasing the local instability, which, combined with the sea breeze, orographic effects and diurnal heating could result in the typical strong afternoon convection of a wet April. Marine A set of surface troughs, one to the northwest and other to the northeast of the islands will promote light to locally moderate northeast winds today into Friday. A small northeasterly swell will move across the Atlantic waters through the weekend. The surface trough northeast of the region and a surface high pressure building across the western Atlantic will promote moderate to locally fresh trades by the weekend. .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. |
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