NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION. Privacy and Cookie policy

AMZ712 Coastal Waters Of Northern Puerto Rico Out 10 Nm- 1048 Am Ast Sat Sep 23 2023
Rest of today..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas around 5 feet. Dominant period 7 seconds. Scattered showers. Isolated Thunderstorms this afternoon.
Tonight..Southeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas around 5 feet. Dominant period 7 seconds. Scattered showers.
Sunday..East winds 10 to 15 knots. Gusts up to 25 knots in the afternoon. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Scattered showers. Isolated Thunderstorms in the afternoon.
Sunday night..East winds 10 to 15 knots. Gusts up to 25 knots in the evening. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 12 seconds. Isolated showers. Isolated Thunderstorms after midnight.
Monday..East 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 11 seconds. Scattered showers with isolated Thunderstorms.
Tuesday..Northeast winds 10 to 15 knots. Gusts up to 25 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. Scattered showers with isolated Thunderstorms.
Wednesday..Northeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas around 5 feet. Dominant period 13 seconds. Numerous showers with isolated Thunderstorms.

AMZ700 1048 Am Ast Sat Sep 23 2023
Synopsis for puerto rico and the uS. Virgin islands waters... Seas should remain favorable for small craft although they will become choppy in atlantic waters by late Tuesday. Light to moderate east winds will continue. The next tropical wave is expected by tomorrow into Monday and we anticipate shower and Thunderstorm activity across the regional waters.

FXCA62 TJSJ 230907 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 507 AM AST Sat Sep 23 2023

SYNOPSIS
The persistent hot weather pattern we have observed across the islands will continue today. Therefore, several heat related advisories and warnings are in effect from 10 AM to 5 PM.
This diurnal heating, along with sea breeze convergence and local effects will promote strong showers and thunderstorms mainly across interior to western Puerto Rico. A tropical wave will increase shower and thunderstorm activity across the region on Sunday into Monday. Model guidance continues to lean towards the current AL90 staying over the tropical Atlantic next week. Please continue to monitor the latest updates from the National Hurricane Center (NHC) and WFO San Juan regarding this system.

SHORT TERM
Today through Monday...

Western Puerto Rico had clear skies overnight, while eastern Puerto Rico, Culebra, Vieques, and the U.S. Virgin Islands had variably cloudy skies with occasional passing showers that moved inland. Low temperatures dropped into the low 80s and upper 70s across the coastal areas and into the mid-70s or upper 60s across the mountain sites—winds were mainly from the east to east- southeast at less than ten mph.

The persistent hot weather pattern we have observed across the islands will continue today, with heat index values surpassing 107 degrees Fahrenheit across the urban and coastal areas in Puerto Rico and the U.S. Virgin Islands. Therefore, an Excessive Heat Warning is in effect for Vieques, Culebra, and St Croix, and the rest of the lower elevations are under a Heat Advisory from 10 am to 5 pm this afternoon. Strong thunderstorms will again develop across the mountain areas and western coastal sections due to the local effects, excessive heating, and sea breeze variations during the afternoon. This activity may result in urban and small-stream flooding, frequent cloud-to-ground lightning, and gusty winds across the interior, western, and northeast PR, including the SJ Metro.

It's possible that the Total Precipitable Water (TPW) may rise by 2 to 2.35 inches between Sunday and Monday thanks to a tropical wave moving into the area. The GFS GDI indicates that there is a chance for scattered to numerous showers and thunderstorms every day, especially in the afternoons. As a result, the weather could be wet and unstable, with heavy rains, strong winds, and intense thunderstorms early next week.

LONG TERM
Tuesday through Saturday...

Northeasterly winds are forecast to prevail during most of the long term forecast period. Current model guidance indicates a drying trend on Tuesday as a tropical wave, and moisture associated with it, moves away from the islands. Patches of moisture will continue to filter into the region on Wednesday through Saturday, maintaining precipitable water (PWAT) values at up to normal values. During the night and early morning hours, passing showers affect windward sectors of the islands, particularly across northern and eastern Puerto Rico, and across Vieques, Culebra and the USVI. NE wind flow will help promote afternoon shower activity, induced by sea breeze convergence, diurnal heating and local effects, mainly over sectors of interior to southern Puerto Rico each day. Afternoon activity could also be observed downwind of El Yunque, Vieques, Culebra, and the USVI. Maximum temperatures should be in the upper 80s to low 90s across lower elevations of the islands. Minimums should range in the upper 70s to low 80s across lower elevations of the islands, and in the upper 60s to lower 70s across higher elevations of Puerto Rico.
At least a limited excessive heat risk will persist each late morning to early afternoon across urban, coastal and lower elevation areas. A tropical wave (AL90), currently several hundred miles west of the Cabo Verde Islands, has a high chance of development. The NHC's 2 AM EDT TWOAT mentions that this system will likely become a tropical depression during the next couple of days. With model consensus now leaning towards this system staying over the Atlantic, the main hazard from this system would be swells reaching our local waters and coastlines. Please continue to monitor the latest updates from the NHC and WFO San Juan regarding this system.

AVIATION
Mainly VFR conditions will prevail during the morning.
Afternoon TSRA/SHRA could result in brief MVFR conditions, mainly across PR terminals btwn 23/17-23z. After that, SHRA may affect USVI terminals and TJSJ, without significant impacts. Surface winds will remain from the east-southeast at 5 to 10 kt but will then range between 10- 15 knots with higher gusts after 23/13z.

MARINE
Seas should remain favorable for small craft at 2 to 5 feet through early next week. Light to moderate east winds will continue before becoming more northeasterly by mid next week. The next tropical wave is expected by tomorrow into Monday and we anticipate shower and thunderstorm activity across the regional waters. Seas are forecast to increase by midweek next week with swells from a tropical cyclone over the open Atlantic, well east northeast of the islands.

Today, there is a moderate risk of rip currents for north oriented beaches of Puerto Rico, from Aguadilla to Fajardo, as well as the northern beaches of Culebra. There is also a moderate risk of rip currents today today for the northeastern beaches of St. Thomas and the easternmost beaches of St. Croix. Low risk elsewhere across the islands.

SJU WATCHES/WARNINGS/ADVISORIES
PR...Heat Advisory from 10 AM this morning to 5 PM AST this afternoon for PRZ001>003-005-007-008-010-011.

Excessive Heat Warning from 10 AM this morning to 5 PM AST this afternoon for PRZ012-013.

VI...Heat Advisory from 10 AM this morning to 5 PM AST this afternoon for VIZ001.

Excessive Heat Warning from 10 AM this morning to 5 PM AST this afternoon for VIZ002.

AM...None.

toggle option: (graph/table)

Boca De Cangrejos
Click for Map
Sat -- 01:26 AM AST     0.72 feet High Tide
Sat -- 06:13 AM AST     Sunrise
Sat -- 08:36 AM AST     -0.04 feet Low Tide
Sat -- 01:52 PM AST     Moonrise
Sat -- 04:40 PM AST     1.40 feet High Tide
Sat -- 06:19 PM AST     Sunset
Sat -- 11:44 PM AST     0.63 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Boca De Cangrejos, Isla Verde, San Juan, Puerto Rico, Tide feet

San Juan
Click for Map
Sat -- 01:27 AM AST     1.03 feet High Tide
Sat -- 06:13 AM AST     Sunrise
Sat -- 08:07 AM AST     0.11 feet Low Tide
Sat -- 01:52 PM AST     Moonrise
Sat -- 03:55 PM AST     1.90 feet High Tide
Sat -- 06:19 PM AST     Sunset
Sat -- 10:46 PM AST     0.85 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION

San Juan, Puerto Rico, Tide feet

Full Color Weather Map

Link to Loop


Other links: GEOS-West     Contential US     Full GOES-East

Virgin,Islands/San,Juan/Cayey,PR