Anegada Passage Southward to 17N Marine Forecast
| Rest Of Today...Southwest Winds 5 To 10 Knots. Seas 2 To 4 Feet With Occasional Seas Around 5 Feet. Dominant Period 11 Seconds. Isolated Showers. |
| Tonight...West Winds 5 To 10 Knots. Seas 2 To 4 Feet With Occasional Seas Around 5 Feet. Dominant Period 11 Seconds. Isolated Showers. |
| Thursday...West Winds 10 To 15 Knots. Seas 3 To 5 Feet With Occasional Seas Up To 6 Feet. Dominant Period 12 Seconds. Isolated Showers. |
| Thursday Night...North Winds 10 To 15 Knots. Seas 6 To 8 Feet With Occasional Seas Up To 10 Feet. Dominant Period 12 Seconds. Scattered Showers. |
| Friday...North Winds 10 To 15 Knots, Becoming Northeast. Seas 5 To 7 Feet With Occasional Seas Up To 9 Feet. Dominant Period 11 Seconds. Isolated Showers. |
| Saturday...Southeast Winds 5 To 10 Knots. Seas 6 To 8 Feet With Occasional Seas Up To 10 Feet. Dominant Period 12 Seconds. Isolated Showers. |
| Sunday...South Winds 5 To 10 Knots, Becoming East. Seas 5 To 7 Feet With Occasional Seas Up To 9 Feet. Dominant Period 14 Seconds. |
| Area Forecast Discussion National Weather Service San Juan PR 510am AST Thu Mar 5 2026 .Short Term(Today through Saturday)... Issued at 510am AST Thu Mar 5 2026 Variable weather condtions prevailed for windward sectors of the islands as breezy ENE steering flow steered rapid showers and cloudiness towards the region. Satellite derived precipitable water (PWAT) values indicate that the patch of moisture that affected the region yesterday and during the early overnight hours is already over the Mona Passage and moving away from the region. However, another patch of moisture with PWAT (Precipitable Water) values up to around 1.50 inches is already over the eastern region. PWAT (Precipitable Water) values over the region indicate a range of around an inch over western PR to 1.44 in over the USVI. Radar estimated accumulations since midnight indicate around .10 to .20 inches over sectors of the northeastern quadrant of Puerto Rico, as well as over Vieques. Isolated sectors of the USVI, as well as sectors of southeastern, north-central and western PR received minimal accumulations. Official and unofficial stations over higher elevations of PR report minimum temperatures in the low to mid 60s. Stations over lower elevations of southwestern, southern, southeastern, and northwestern interior PR have reported minimum temperatures in the mid 60s to low 70s. Other stations over lower elevations of the islands reported minimum temperatures in the 70s. Some stations have also reported reported max wind gusts ranging from 19 to 27 mph since midnight. No major changes regarding wind risks as model guidance continues to remain consistent on breezy to windy conditions continuing towards the end of the week. Breezy to windy conditions will remain the dominant feature of the forecast. A broad surface high over the western to central Atlantic will continue to promote breezy to windy ENE flow as it tightens the local pressure gradient. This will promote a limited to elevated wind risk over the islands, unsecured items could blow around. This breezy flow will, however, maintain 925 mb temperatures at normal values during the period. The above mentioned patch of moisture with PWAT (Precipitable Water) values up to around 1.50 inches already over the eastern region, will continue to move over the islands today with model guidance indicating up to 1.6 inches of PWAT (Precipitable Water) over the area with western PR reaching around 1.80 in during the afternoon. Although a jet over the region can provide some ventilation, most available moisture will remain mainly below 850 mb and 500mb temperatures will remain relatively warm today and tomorrow, limiting vertical shower development today. A limited flooding risk will remain today over eastern PR and over western PR as fast-moving trade wind showers continue to move over the region, mainly over windward areas of the islands with the breezy to windy flow pushing them further inland. Afternoon showers are also forecast over western Puerto Rico. Patches of both more humid and drier air will continue to be steered towards the islands under the breezy to windy ENE flow along with low concentrations of saharan dust. Model guidance suggests more broad patches of moist air moving over the islands Friday night into Saturday, sustaining up to around 1.7 to 1.8 in of PWAT, above normal values. 500mb temperatures will cool somewhat on Saturday and into the long term period as a trough approaches from the west. Between these broad patches of moisture, patches of drier and moist air will continue to arrive during the period. These moist patches can enhance the frequency of fast-moving showers over windward sectors of the islands, and then promote the development of afternoon showers over W-SW Puerto Rico. .Long Term(Sunday through Thursday)... Issued at 510am AST Thu Mar 5 2026 High pressure over the western Atlantic will remain the dominant feature through midweek while gradually shifting northeast. This pattern will maintain easterly to east-northeasterly winds across the northeastern Caribbean, with breezy to windy conditions prevailing for much of the period. Winds may weaken slightly around midweek as the pressure gradient relaxes, though breezy conditions are still expected. Aloft, a trough over the western Atlantic and the Greater Antilles will linger nearby, with its axis initially near eastern Cuba and slowly drifting toward western Hispaniola by midweek. This feature will provide some upper-level ventilation over Puerto Rico and the U.S. Virgin Islands. Despite this, dry air in the mid-levels will continue to limit thunderstorm or deep convective development. Moisture will remain near typical to slightly above-normal levels for this time of year, before gradually trending drier later in the period. Late in the period, an easterly wind perturbation or weak surface trough may approach the area Wednesday night. Hazards during this period will be led by breezy to windy conditions across land areas. Rainfall will remain a secondary concern, mainly from frequent fast-moving trade wind showers affecting windward areas overnight and during the morning hours. Limited afternoon showers may develop across interior and western Puerto Rico. Periods of moderate rainfall with passing showers could lead to brief ponding of water in poor drainage areas, but the overall flooding risk remains low. Marine Issued at 510am AST Thu Mar 5 2026 Hazardous marine conditions will continue over the next several days. A series of high pressure systems across the Atlantic will promote fresh to locally strong east-northeasterly winds throughout the forecast period. This will continue to result in choppy to rough seas across most regional waters and local Caribbean passages, hazardous for small craft operators. At this time, Small Craft Advisories remain in effect through at least 6pm AST Sunday, though these may be extended as conditions will probably continue hazardous next workweek as well. Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. Beach Forecast Issued at 510am AST Thu Mar 5 2026 A high risk of life-threatening rip currents remains in effect today for the northern and eastern beaches of Puerto Rico and St. Croix due to breezy to windy coastal conditions combined with some energy from a northeast wind swell. These hazardous conditions for beachgoers are expected to persist through the rest of the week and into early next week. For that reason, the Rip Current Statement will likely need to be extended in time in the coming days and probably additional areas will need to be added. Beachgoers should heed the advice of lifeguards, as well as beach patrol flags and posted signs. For the remaining areas, a moderate risk will prevail, meaning that life-threatening rip currents are still possible in the surf zone. Beachgoers should continue to exercise caution. For additional information and location-specific rip current details, please visit: weather.gov/beach/sju. .SJU WATCHES/WARNINGS/ADVISORIES... PR...High Rip Current Risk through Sunday afternoon for PRZ001-002- 005-008. VI...High Rip Current Risk through Sunday afternoon for VIZ002. AM...Small Craft Advisory until 6pm AST Sunday for AMZ711-712-716- 723-726-733-741. Small Craft Advisory until 6am AST Friday for AMZ735. |
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