Saturday, February29, 2020
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Marine Weather and Tides
Emajagua, PR

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:41AMSunset 6:30PM Saturday February 29, 2020 3:53 AM AST (07:53 UTC) Moonrise 10:28AMMoonset 11:27PM Illumination 32% Phase: Waxing Crescent; Moon at 6 days in cycle
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.
Marine Forecasts
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AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 929 Pm Ast Fri Feb 28 2020
Rest of tonight..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Isolated showers.
Saturday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Isolated showers.
Saturday night..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Isolated showers.
Sunday..East winds 5 to 10 knots veering southeast in the afternoon. Seas 1 to 3 feet. Dominant period 10 seconds. Scattered showers.
Sunday night..Northeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
Monday..Northeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
Tuesday..Northeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
Wednesday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
AMZ700 929 Pm Ast Fri Feb 28 2020
Synopsis for puerto rico and the uS. Virgin islands waters... Gentle to moderate easterly winds prevail across the local waters, becoming more southeasterly on Saturday as a frontal trough approaches the region. Seas less than 5 feet are expected for most of the weekend. On Sunday night, a cold front will push into the area from the northwest, bringing increased shower activity. Winds and seas will also increase with the arrival of the front as well as a northerly swell that will push into the local waters around the same time.


7 Day Forecast for Marine Location Near Emajagua, PR
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location: 18, -65.88     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 290151 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 951 PM AST Fri Feb 28 2020

UPDATE. Showers are redeveloping over sections of western Puerto Rico, rainfall amounts so far observed during the past 6 hours have ranged between 0.05-0.25 inches across these areas. This activity should end around midnight. Elsewhere, showers were developing over the eastern and northern waters of Puerto Rico due to a weak surface trough moving across our northern waters. Some of this activity could move across portions of the USVI and east/northeast sections of PR through the overnight hours.

AVIATION Update. Mainly VFR conditions expected, except tempo MVFR cigs at TJBQ possible thru 04z. The latest 29/00z TJSJ upper air sounding indicated E-ESE winds at 3-14 kts below 2500 ft.

MARINE Update. Buoys across the surrounding waters of PR and the USVI were indicating seas between 2-4 feet and east winds at less than 12 knots. Seas will increase on Sunday and through early next week due to a northerly swell. A moderate risk of rip currents is expected across the northern beaches of the islands on Saturday.

PREV DISCUSSION. /issued 351 PM AST Fri Feb 28 2020/

SYNOPSIS .

Fair weather continues today with stable conditions persisting over the region. Increasing moisture and decreasing stability will lead to increasing potential for showers through the weekend. This will be followed by the arrival of a frontal boundary, and unsettled weather will dominate the first part of the week next week.

SHORT TERM . Rest of Today through Sunday .

Moisture across the area has increased compared to yesterday. However, with ridging aloft, there remains high levels of stability, which is evidenced in the 12Z sounding, with a strong inversion around 820 hPa. This will prevent significant development of shower activity; though some showers are still possible, they are not likely to be widespread or to bring heavy rainfall.

A frontal boundary is expected to approach the region late this weekend. As it does, the trough with which it is associated will be eroding the ridging across the area as the ridge also pulls away to the northeast, decreasing the stability somewhat. Meanwhile, moisture will continue to increase through the weekend as well. Because of this, increasing shower activity is anticipated, somewhat on Saturday, but more significantly on Sunday.

LONG TERM . Monday through Saturday . From Prev Discussion .

A polar trough moving near the islands will replace the ridge aloft that prevailed through last week. At the surface, a cold front forecasted to stall until dissipates over the islands will induce a surface trough and will bring plenty of moisture through much of the week. Both GFS and ECMWF are suggesting shower conditions and pleasant temperatures through the first half of next week. Global models have been consistent in suggesting an unstable and moist weather pattern during the medium-range forecast. Therefore, confidence in them has increased today.

Surface high pressure behind the front will move into the central Atlantic Wednesday and Thursday. Furthermore, an upper-level ridge is forecast to build over the Northeast Caribbean. GFS is now indicating additional moisture being push over the islands through at least Friday. Although moisture is forecast to slowly erodes, showery weather looks possible through the second part of the work-week too. At this time, there is a lot of uncertainty in this scenario. Moisture will erodes ahead of a cold front, suggested near the region by the weekend.

AVIATION .

VFR with passing SHRA en route btw islands and over regional waters SCT ocnly BKN lyrs nr FL025. FL050. Few tops nr FL100. Sfc wnds FM E 10-15 kts with sea breeze variations bcmg lgt/vrb aft 28/23Z. L/lvl wnds fm ENE 15-20 kts BLO FL150. No sig operational wx impacts durg prd.

MARINE .

Seas are generally subsiding this afternoon, and will generally be below 5 feet through most of the weekend. On Sunday night, a northerly swell will push into the local Atlantic waters, associated with a cold front; combined with enhanced winds forecast behind the front, this is expected to cause hazardous marine conditions that will last through at least midweek. For the beachgoers, there is a moderate risk of rip currents at north-facing beaches, and low to moderate risk elsewhere.

PRELIMINARY POINT TEMPS/POPS. SJU 74 86 73 84 / 50 30 40 50 STT 73 84 72 83 / 50 30 30 50

SJU WATCHES/WARNINGS/ADVISORIES. PR . None. VI . None. AM . None.

SHORT TERM . DS LONG TERM . CS PUBLIC DESK . LIS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
YABP4 - 9754228 - Yabucoa Harbor, PR 5 mi54 min 70°F 67°F
JOXP4 - Jobos Bay Reserve, Puerto Rico 18 mi69 min Calm 72°F 1018 hPa65°F
ESPP4 - 9752695 - Esperanza, PR 23 mi54 min NNE 2.9 G 4.1 76°F 80°F1017.4 hPa (-1.8)
41056 28 mi54 min ENE 5.8 G 7.8 78°F 80°F2 ft1016.2 hPa (-1.8)
SJNP4 - 9755371 - San Juan, PR 34 mi54 min WSW 5.1 G 5.1 74°F 81°F1017.6 hPa (-1.3)
41053 - San Juan, PR 35 mi54 min SSW 3.9 G 5.8 76°F 80°F4 ft1016.4 hPa (-1.3)
42085 - Southeast of Ponce, PR 36 mi54 min NE 7.8 G 9.7 78°F 81°F2 ft1015.9 hPa (-1.7)
CLBP4 - 9752235 - Culebra, PR 37 mi54 min 74°F 81°F1017.2 hPa (-1.9)

Wind History for Yabucoa Harbor, PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR30 mi3 hrsN 010.00 miA Few Clouds73°F69°F89%1018.3 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
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Last 24hrCalmS3CalmS3SE4E5E6NE15NE10NE13NE12E14
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1 day agoCalmCalmS3CalmCalm3E8E8E13E14E13NE13NE12NE11E12E8E7SE4SE4CalmCalmCalmCalmCalm
2 days agoE7E10SE5E4SE4E6E15NE14E16
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Tide / Current Tables for Puerto Maunabo, Puerto Rico
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Puerto Maunabo
Click for Map
Sat -- 01:29 AM AST     0.41 feet High Tide
Sat -- 03:43 AM AST     0.33 feet Low Tide
Sat -- 06:42 AM AST     Sunrise
Sat -- 10:28 AM AST     Moonrise
Sat -- 10:43 AM AST     0.41 feet High Tide
Sat -- 04:45 PM AST     0.02 feet Low Tide
Sat -- 06:29 PM AST     Sunset
Sat -- 11:27 PM AST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.40.40.30.30.30.40.40.40.40.40.40.40.30.20.10000.10.10.20.20.3

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
Click for Map
Sat -- 02:48 AM AST     0.66 knots Max Flood
Sat -- 06:05 AM AST     -0.00 knots Slack
Sat -- 06:41 AM AST     Sunrise
Sat -- 09:21 AM AST     -0.64 knots Max Ebb
Sat -- 10:26 AM AST     Moonrise
Sat -- 12:55 PM AST     0.00 knots Slack
Sat -- 03:23 PM AST     0.34 knots Max Flood
Sat -- 05:56 PM AST     -0.00 knots Slack
Sat -- 06:28 PM AST     Sunset
Sat -- 09:05 PM AST     -0.48 knots Max Ebb
Sat -- 11:26 PM AST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.40.60.70.60.30-0.3-0.5-0.6-0.6-0.5-0.200.20.30.30.2-0-0.2-0.4-0.5-0.4-0.3

Weather Map
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wmap_A
GEOS Local Image of Puerto Rico    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (2,6,7,8)
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Ground Weather Radar Station Puerto Rico,Virgin Islands
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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.