Southern Puerto Rico out 10nm Marine Forecast
| Today...East Winds 10 To 15 Knots With Gusts Up To 20 Knots. Seas 3 To 4 Feet, Occasionally To 5 Feet. Wave Detail: Southeast 3 Feet At 6 Seconds. Isolated Showers This Morning. Isolated Showers Late. |
| Tonight...East Winds 10 To 15 Knots With Gusts Up To 20 Knots. Seas 3 To 4 Feet, Occasionally To 5 Feet. Wave Detail: East 3 Feet At 6 Seconds. |
| Saturday...East Winds 10 To 15 Knots With Gusts Up To 20 Knots. Seas 3 To 4 Feet, Occasionally To 5 Feet. Wave Detail: Southeast 3 Feet At 6 Seconds. |
| Saturday Night...East Winds 10 To 15 Knots With Gusts Up To 20 Knots. Seas 2 To 3 Feet. Wave Detail: East 3 Feet At 6 Seconds. |
| Sunday...East Winds 10 To 15 Knots With Gusts Up To 20 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet. Wave Detail: East 3 Feet At 6 Seconds. Scattered Showers In The Morning. |
| Sunday Night...East Winds 10 To 15 Knots With Gusts Up To 20 Knots, Becoming Northeast 5 To 10 Knots After Midnight. Seas 2 To 3 Feet. Wave Detail: East 3 Feet At 6 Seconds. Scattered Showers. |
| Monday...East Winds 10 To 15 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet. Numerous Showers, Mainly In The Morning. |
| Monday Night...East Winds 5 To 10 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet. Numerous Showers. |
| Tuesday...East Winds 10 To 15 Knots. Seas 3 To 4 Feet, Occasionally To 5 Feet. Numerous Showers, Mainly In The Morning. |
| Tuesday Night...East Winds 10 To 15 Knots. Seas 3 To 4 Feet, Occasionally To 5 Feet. Numerous Showers. |
| Area Forecast Discussion National Weather Service San Juan PR 223pm AST Thu April 9 2026 .Short Term(This evening through Saturday)... Issued at 223pm AST Thu April 9 2026 During the morning hours, partly cloudy skies prevailed across the region, with only a few light showers and minimal accumulations. Winds have been mainly from the east to southeast at around 10 to 15 mph, with occasional higher gusts. Daytime maximum temperatures are ranging from the mid-80s to the low 90s across low-elevation, urban, and coastal areas, and from the upper 70s to the low 80s in the mountainous regions. Across the USVI, temperatures are fluctuating in the upper 80s. Heat indices have reached the low 100s, consistent with a limited heat threat. For the rest of the afternoon, scattered showers are expected to develop across west-central into northwestern Puerto Rico. A limited flood risk persists due to the possibility of localized ponding of water on roads and in poorly drained areas. In general, a broad surface high over the central Atlantic continues to interact with a frontal low over the western Atlantic, as a result, winds will gradually back and become more easterly during the short-term period. At mid-levels, ridging is prevailing, supporting stability and preventing showers from strengthening. Additionally, according to the latest precipitable water (PWAT) satellite-derived imagery, an air mass with values around 1.5 inches will continue to dominate across the region through Saturday, which is considered normal for this time of year. The 250 mb heights, 500 mb temperatures, and 700–500 mb relative humidity values will remain above normal, contributing to increased stability. As a result, for tomorrow (Friday), a generally stable weather pattern is expected, with no flood threat anticipated at this time. Only a few isolated afternoon showers are expected over northwestern Puerto Rico due to local effects, with no significant impacts. By Saturday, showers will continue to affect windward sectors during the night and morning hours, followed by afternoon convection across northwestern Puerto Rico. This will maintain a localized, limited flood risk across the northwestern quadrant of the island. In the short term, warmer-than-normal temperatures will persist, as reflected in the 925 mb temperature forecasts, which remain near the 75th percentile over the next few days. As a result, a limited heat risk will continue across low-elevation and urban areas of the islands. .Long Term(Sunday through next Wednesday)... Issued at 450am AST Thu April 9 2026 A transition toward a wetter and more unstable pattern is expected beginning Sunday as a deep-layered trough approaches the region and interacts with above-normal moisture. Early in the period, conditions will still resemble a typical diurnal pattern, with passing morning showers across eastern Puerto Rico and the U.S. Virgin Islands followed by afternoon convection over western Puerto Rico. However, as the trough moves closer and moisture increases, shower and thunderstorm activity is expected to become more widespread from late Sunday into early next week. The most active period currently appears to be Monday into Tuesday, when deeper moisture and cooler temperatures aloft will support more organized convection. Thereafter, conditions should gradually trend toward near-normal by mid to late week, although lingering moisture may continue to support scattered shower activity. Confidence in this overall pattern is moderate, particularly regarding the timing and coverage of the wettest period. The primary hazard will be an increasing risk of flooding, especially from Monday into Tuesday when more persistent and widespread showers and thunderstorms are expected. Periods of heavy rainfall may result in ponding of water on roadways, urban and small stream flooding, and isolated flash flooding where repeated activity develops. Thunderstorms will also pose a risk of frequent lightning and locally gusty winds. While impacts early in the period should remain localized, the potential for more widespread and impactful conditions increases early next week. Given the evolving pattern and moderate forecast confidence, residents and visitors should continue to monitor updates as details may change. For additional information, please refer to the Hydrologic Outlook (ESFSJU). Marine Issued at 223pm AST Thu April 9 2026 A broad surface high pressure, in combination with a frontal boundary just to the northwestern Atlantic, will induce moderate easterly winds across the local waters. Wave heigheights for tonight have fluctuated between 3 and 4 feet; however, deteriorating marine conditions are expected as a northwest to north swell spreads across the local waters, increasing seas from tomorrow into the upcoming weekend. Therefore, small craft should continue to exercise caution. From Sunday onward, a deep upper-level trough and the associated surface trough will enhance thunderstorm activity, resulting in localized hazardous marine conditions. Mariners can expect periods of gusty winds and reduced visibility in and around showers and thunderstorms. Mariners are urged to stay tuned for further updates. Beach Forecast Issued at 223pm AST Thu April 9 2026 A small, long-period swell will continue to result in a high risk of rip currents across all northern and northeastern coastal areas of Puerto Rico, including Culebra. Another northwest to north long-period swell, with wave heigheights of 4 to 5 feet as indicated by buoy 41046, will further reinforce hazardous conditions. Therefore, large breaking waves will lead to life-threatening rip current conditions for the rest of the week and into the upcoming weekend. A moderate risk of rip currents will remain in place for the southern coastal areas and some western sections as the swell migrates southward into the local waters. Beachgoers are strongly urged to remain out of the water, especially along exposed northern and northeastern beaches. Conditions may vary locally, but even experienced swimmers can be caught in dangerous rip currents under this pattern. For more detailed information, please visit www.weather.gov/sju/marine .SJU WATCHES/WARNINGS/ADVISORIES... PR...High Rip Current Risk through late Friday night for PRZ001-002- 005-008-012. VI...None. AM...None. |
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