Southern Puerto Rico out 10nm Marine Forecast
| Rest Of Tonight...East Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. Scattered Showers Late This Evening, Then Numerous Showers With Isolated Thunderstorms. |
| Thursday...East Winds 5 To 10 Knots, Becoming Southeast 10 To 15 Knots With Gusts Up To 20 Knots In The Afternoon. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. Scattered Showers. |
| Thursday Night...East Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: East 2 Feet At 5 Seconds. Scattered Showers In The Evening, Then Numerous Showers After Midnight. |
| Friday...East Winds 10 To 15 Knots With Gusts Up To 20 Knots. Seas 2 To 3 Feet, Occasionally To 4 Feet. Wave Detail: East 2 Feet At 5 Seconds. |
| Friday Night...East Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. Scattered Showers. |
| Saturday...East Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. |
| Saturday Night...East Winds 5 To 10 Knots. Seas Around 2 Feet. Scattered Showers. |
| Sunday...Southeast Winds 10 To 15 Knots. Seas Around 2 Feet. Scattered Showers In The Morning. |
| Sunday Night...East Winds 5 To 10 Knots. Seas 2 To 3 Feet, Occasionally To 4 Feet. |
| Monday...East Winds 10 To 15 Knots. Seas 2 To 3 Feet, Occasionally To 4 Feet. |
| Monday Night...East Winds 10 To 15 Knots. Seas 2 To 3 Feet, Occasionally To 4 Feet. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service San Juan PR 501pm AST Wednesday September 11 2024 Synopsis A surge of moisture is expected to reach the islands by Thursday and Friday, increasing the potential for showers and thunderstorms mainly across the interior and western Puerto Rico. Abundant moisture and light east to southeasterly winds will result in hot and muggy conditions through the rest of the workweek. A tropical wave (Invest 92L) will approach the local area by Saturday increasing the chances for strong showers and isolated thunderstorms across the islands. .SHORT TERM...Tonight through Friday... Mainly fair weather conditions were observed across the region today with very limited shower activity. The cloud coverage began to increase around mid-afternoon along the Cordillera Central. Showers developed from western Adjuntas through Moca. Doppler radar estimated rainfall accumulations between 1.0 to 2.0 inches over these municipalities. However, later this afternoon more showers may develop over the Cordillera Central that may affect the central municipalities from Barranquitas to Jayuya. Today, hot conditions were observed too. Highs were seen in the upper 80s to mid 90s along the coastal and urban areas. The Luis Munoz Marin International Airport in San Juan had a maximum temperature of 92 degrees Fahrenheit. A Heat Advisory was in effect for the municipalities of northern, western and southern Puerto Rico. Heat indices were seen above 110 degrees Fahrenheit mainly over the south and northwestern Puerto Rico. A meandering TUTT continues to influence the local weather conditions. The bulk of the moisture associated to this system is east of the U.S. Virgin Islands and over the Leeward Islands, leaving Puerto Rico and the U.S. Virgin Islands under a relatively dry patch. By tomorrow Thursday into Friday, the TUTT is expected to weaken and move north and away from the region. Nonetheless, sufficient tropical moisture moving from the Caribbean waters, daytime heating and local effects will induce shower activity and isolated thunderstorms along the Cordillera Central and western Puerto Rico each afternoon. The latest Precipitable Water Content Analysis (PWAT) suggest above-normal moisture with values from 2.0 to 2.2 inches through Friday. WInds will prevail from the east on Thursday, then becoming from the southeast on Friday. The National Hurricane Center is currently watching a tropical wave (Invest 92L) with a low formation chance of 30% within the next 48 hours and 7 days. This wave may reach the local area by Saturday increasing the potential of strong showers and thunderstorms across the region. Residents and visitors should continue to monitor the progress of this system as it moves towards the northeastern Caribbean. Please refer to the latest Tropical Weather Outlook (TWOAT) issued by National Hurricane Center for updated information. Long Term Saturday through Wednesday /issued at 516am AST/ Weak mid to upper level ridging will promote more stable conditions aloft this weekend. However, southeasterly winds will continue to bring high end normal to above normal columnar moisture to the region through Sunday. Invest 92L, is also forecast to reach our area during the start of the weekend, likely as a weak disturbance but increasing the coverage and intensity of showers. It's not until next Monday, and onwards, that columnar moisture becomes more normal and patch, mostly contained to below 850 mb. This will result in a drier weather pattern with precipitable water (PWAT) ranging between 1.50-1.80 inches. Shower and thunderstorm activity will follow the typical pattern, with higher chance of t- storms developing during the afternoons over the western half of PR steered by E-SE winds, and isolated to locally scattered showers streaming over the USVI and eastern sections of PR during the night and early morning hours. East-southeast winds can also help promote high heat indices in coastal, urban and lower elevation areas, reaching above 108 degrees Fahrenheit. According to the 2am Tropical Weather Outlook (TWO), the NHC monitors two disturbances over the tropical Atlantic: Invest 92L, with a low chance of development through 7 days, and Invest 93L, with a high chance of development through 7 days. Invest 92L is expected to reach an area of stronger upper-level winds tomorrow, likely ending its chances for development and, as previously mentioned, ultimately reaching our area this weekend as a weak disturbance. Invest 93L is forecast to stay over the open Atlantic waters. Please continue to monitor future forecast updates from the NHC and from WFO San Juan. Marine A surface high pressure over the far northeastern Atlantic will promote gentle to moderate easterly winds over the next few days. A lingering upper-level trough will continue to affect the area through late tonight although above normal moisture will persist through Sunday. Showers and isolated thunderstorms will affect the regional waters each afternoon. A tropical wave being monitored by the National Hurricane Center, Invest 92L, will bring active weather from late Friday night into Saturday evening. Beach Forecast A moderate risk of rip currents will continue for the northern beaches of Puerto Rico through at least tomorrow. There is a moderate risk of rip currents for eastern Puerto Rico, Culebra and St. Croix as well. Low risk elsewhere. Isolated thunderstorms with occasional lightning strikes are expected today across most coastal areas of the islands. .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. |
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