Northwestern Puerto Rico out 10nm Marine Forecast
| Rest Of Tonight...East Winds 5 To 10 Knots. Seas 1 To 3 Feet. Dominant Period 10 Seconds. Isolated Showers. |
| Tuesday...Southeast Winds 5 To 10 Knots. Seas 1 To 3 Feet. Dominant Period 10 Seconds. Isolated Thunderstorms In The Afternoon. |
| Tuesday Night...East Winds 5 To 10 Knots. Seas 1 To 3 Feet. Dominant Period 10 Seconds. Isolated Thunderstorms In The Evening. Scattered Showers. |
| Wednesday...East Winds 5 To 10 Knots, Becoming Northeast In The Afternoon. Seas 1 To 3 Feet. Dominant Period 10 Seconds. Scattered Showers. Isolated Thunderstorms In The Afternoon. |
| Wednesday Night...East Winds 5 To 10 Knots. Seas 1 To 3 Feet. Dominant Period 11 Seconds. Isolated Showers. |
| Thursday...East Winds 10 To 15 Knots. Gusts Up To 25 Knots. Seas 3 To 5 Feet With Occasional Seas Up To 6 Feet. Dominant Period 10 Seconds. Isolated Thunderstorms Through The Day. Numerous Showers. |
| Friday...Northeast Winds 15 To 20 Knots With Gusts Up To 30 Knots. Seas 3 To 5 Feet With Occasional Seas Up To 6 Feet. Dominant Period 10 Seconds. Isolated Thunderstorms Through The Day. Numerous Showers. |
| Saturday...Northeast Winds 10 To 15 Knots With Gusts Up To 25 Knots. Seas 2 To 4 Feet With Occasional Seas Around 5 Feet. Dominant Period 10 Seconds, Subsiding To 8 Seconds. Scattered Showers With Isolated Thunderstorms. |
| Area Forecast Discussion National Weather Service San Juan PR 427pm AST Monday April 22 2024 Synopsis Scattered showers will continue to move overnight across portions of eastern Puerto Rico and the USVI. A wet and unstable weather pattern is expected to continue through at least the end of the workweek. Weather conditions will gradually improve by Saturday with the entrance of a drier airmass. Saharan dust is forecast to arrive on Tuesday promoting hazy skies across the region. .SHORT TERM...Tonight through Wednesday... Persistent shower activity was observed today across the local area. Heavy showers and isolated thunderstorms affected portions of eastern and northern Puerto Rico, including the San Juan metro area. Doppler radar estimated rainfall accumulations between 2 to 4 inches from Dorado to Canovanas, and around 1 inch elsewhere during the afternoon hours. Flood Advisories (FLS) were issued for the mentioned areas. Line of showers and gusty winds were also observed across the local Caribbean and Atlantic waters, where Marine Weather Statements (MWS) were issued. Daytime temperatures stayed in the mid 80s along the coastal and urban areas, and in the upper 70s to low 80s across the mountains. Winds prevailed from the northeast at 10 to 15 mph, with higher gusts embedded in the heavy showers. Scattered to numerous showers will continue across the region during the overnight hours. The main focus area will be the eastern half of Puerto Rico and the waters of the Anegada Passage. This unstable weather pattern will persist until the end of the workweek, promoting showers and isolated thunderstorms each day. Tuesday seems to be the day with less activity due to Saharan dust. However, instability will return on Wednesday, maintaining elevated the potential for flooding, excessive runoff, and landslides. Please be aware that flood advisories/warnings are possible with the expected rainfall activity. Long Term Thursday through Monday... /Issued 414am AST April 22 2024/ The wet pattern will not give way by the end of the workweek. Moisture associated with an old frontal boundary will reach the islands, triggering another round of showers and isolated thunderstorms. At the same time, a deep layered trough moving east of the United States will cause the winds to shift from the south at the mid and upper levels, while winds will remain from the east steered by a surface high pressure over the central Atlantic. The southerly flow will bring a moist column into the region, while a short wave trough (the type that increase instability aloft) will approach the region. These factors should combine to generate more rainfall activity. Since it has been raining for a couple of days now, rivers will remain high and soils saturated, hence the risk for urban and small stream flooding will be elevated. A change in the pattern will begin on Saturday. A broad surface high pressure exiting the eastern seaboard will push a drier air mass into the region...finally. Winds will become more northerly, so temperatures will cool down a little too. The probability of precipitation decreases Saturday onward, although with some showers due to local effects still possible. This drier pattern should stretch into early next week. Marine A surface high pressure north of the area will continue to yield a moderate northeasterly wind flow through at least today. Winds are expected to become from the east southeast on Tuesday as a surface trough prevails across the northeast Caribbean. Showers and isolated thunderstorms will continue to affect the local waters through at least Tuesday. .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. |
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