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- 435 Pm Ast Tue Dec 5 2023
Tonight..East winds 10 to 15 knots with gusts up to 25 knots, diminishing to east 10 to 15 knots after midnight. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 10 seconds.
Wednesday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds.
Wednesday night..Southeast winds 5 to 10 knots, becoming south after midnight. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Isolated showers.
Thursday..Southeast winds 10 to 15 knots, becoming northeast in the afternoon. Seas 2 to 4 feet with occasional seas around 5 feet. Dominant period 10 seconds. Scattered showers.
Thursday night..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas around 5 feet. Dominant period 10 seconds. Scattered showers.
Friday..East winds 15 to 20 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 11 seconds. Scattered showers.
Saturday..East winds 15 to 20 knots with gusts up to 25 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant period 10 seconds. Scattered showers.
Sunday..East winds 15 to 20 knots. Gusts up to 30 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant period 8 seconds, increasing to 10 seconds. Scattered showers.

AMZ700 435 Pm Ast Tue Dec 5 2023
Synopsis for puerto rico and the uS. Virgin islands waters... A broad surface high pressure building over the central atlantic will promote moderate to fresh trade winds across the regional waters. A cold front will move eastward across the western atlantic, approaching the northeastern caribbean by Friday. A mid-period northeasterly swell generated by surface pressure systems will linger across the local waters through the week.

FXCA62 TJSJ 052047 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 447 PM AST Tue Dec 5 2023

SYNOPSIS
Overall fair weather conditions will continue through the week with a possible increase of showers by Friday as a frontal boundary approaches the region. Breezy conditions will continue each afternoon and a stronger northerly swell is forecast to arrive over the weekend. The risk of rip currents will be moderate over the next few days.

SHORT TERM
Tonight through Thursday...

Fair and pleasant weather conditions prevailed today with so far only a few passing light showers noted across eastern and west interior sections of Puerto Rico. The daytime temperatures were in the mid to upper 80s across coastal areas, and upper 70s to low 80s in higher elevations and valleys. Maximum heat indices we in the upper 90s to near 100 degrees mainly along coastal and urban areas.

An overall dry and stable weather pattern will persist with the driest day still looks like Wednesday when model guidance and recent satellite derived imagery, both suggest precipitable water values to drop to one inch or less. Only a few typical passing early morning showers will be possible followed by dry and mostly fair weather skies during the day. A mid-upper level ridge over the western Atlantic will remain in place and thus maintain dry and stable conditions aloft to maintain pleasant weather conditions and limiting vertical development of any shower activity. Model guidance continued to suggest high pressure ridging at all levels with stable weather conditions to persist for most of the period. However by Thursday afternoon onwards the upper ridge is to erode, while a east- southeastern low level wind flow is anticipated as the surface high pressure shift eastwards across the Atlantic and a frontal boundary moves over the western and central Atlantic. This expected wind flow and increased advective pattern will bring shallow patches of moisture across the region, increasing the chances for overnight and early morning passing showers. Consequently, shallow low level moisture, will cross the region from time o time steered by the prevailing easterly winds.

Overall precipitable water values are forecast to remain at or just below the climatological normal for this time of the year, therefore the forecast calls for fair weather and stable conditions with limited rainfall activity, except for the early morning passing showers followed by localized isolated to scattered afternoon shower activity of short duration mainly across the interior and west sections of Puerto Rico.

LONG TERM
Friday through Tuesday...

A mid-level high pressure will slowly build across the region Friday into the weekend, lingering aloft through at least Tuesday of next week. Meanwhile, at the surface, a frontal boundary approaching from the northwest will induce pre-frontal troughs across the Northeast Caribbean, pooling near to above-normal precipitable water over Puerto Rico, the U.S. Virgin Islands, and surrounding waters on Friday. Model guidance put the remnants of the cold front lingering north of the region until it dissipates Saturday and Sunday. An easterly perturbation may also interact with the lingering frontal boundary on Sunday. Under this weather pattern, the winds will prevail mainly from the east to east- northeast, pushing clouds and showers across the windward sections, and showery weather could be possible some days.

After the frontal boundary dissipates, a surface high pressure will build north of the area, increasing the winds Sunday through Tuesday promoting an advective pattern. This advective pattern typically pushes fragments of moisture that produce showery weather from time to time. While the afternoon convection associated with sea breezes does not play an essential role across the western sections, and the rain is observed mainly across the windward areas, or the eastern and northern portions of Puerto Rico, and across the surrounding waters of the U.S. Virgin Islands, moving inland at times.

AVIATION
VFR conds at all TAF sites durg prd. Winds mainly fm E 12-15 kts knots with lcl sea breeze variations. Brief SHRA over the interior and W PR btw 05/18-22Z, may cause Isold-SCT SHRA at TJBQ/TJMZ. Wind will diminish at 05/22Z bcmg calm to LGT/VRB. No sig operational wx impacts attm.

MARINE
A broad surface high pressure building over the Central Atlantic will promote moderate to fresh trade winds across the regional waters. A cold front will move eastward across the Western Atlantic, approaching the Northeastern Caribbean by Friday. A mid- period northeasterly swell generated by surface pressure systems will linger across the local waters through the week. A stronger northerly swell is forecast to arrival over the weekend, beginning Friday.

The risk of rip currents is moderate for most beaches, however southwestern Puerto Rico having a low risk.

SJU WATCHES/WARNINGS/ADVISORIES
PR...None.
VI...High Rip Current Risk until 6 PM AST this evening for VIZ002.

AM...None.

toggle option: (graph/table)

San Juan, La Puntilla, San Juan Bay, Puerto Rico, Tide feet

San Juan
Click for Map
Tue -- 12:15 AM AST     Moonrise
Tue -- 01:51 AM AST     Last Quarter
Tue -- 02:38 AM AST     1.00 feet High Tide
Tue -- 06:42 AM AST     Sunrise
Tue -- 08:17 AM AST     0.47 feet Low Tide
Tue -- 12:58 PM AST     Moonset
Tue -- 03:01 PM AST     1.41 feet High Tide
Tue -- 05:47 PM AST     Sunset
Tue -- 09:43 PM AST     0.44 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

Miami, FL,