Sunday, March26, 2017

Marine Weather and Tides
Tallaboa, PR

Version 3.4
What's New / NOTES
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:24AMSunset 6:40PM Sunday March 26, 2017 8:44 PM AST (00:44 UTC) Moonrise 5:21AMMoonset 5:28PM Illumination 0% Phase: New Moon; Moon at 29 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- 300 Pm Ast Sun Mar 26 2017
Tonight..Southeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
Monday..Southeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Isolated showers.
Monday night..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
Tuesday..East winds 5 to 10 knots veering south in the afternoon. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Isolated showers.
Tuesday night..North winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Isolated showers through the night.
Wednesday..North winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Isolated showers.
Thursday..Northeast winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Isolated showers.
Friday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Scattered showers.
AMZ700 300 Pm Ast Sun Mar 26 2017
Synopsis for puerto rico and the uS. Virgin islands waters... Light south to southwest winds expected tonight as a surface low north of hispaniola continues to move north. A large northerly swell is relaxing in the local atlantic waters and passages, and will continue causing hazardous seas into tonight. Another northerly swell generated by the surface low is forecast to reach the atlantic waters and passages by the middle of next week.

7 Day Forecast for Marine Location Near Tallaboa, PR
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location: 17.98, -66.76     debug

Area Discussion for - San Juan, PR
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Fxca62 tjsj 261940
area forecast discussion
national weather service san juan pr
340 pm ast Sun mar 26 2017

Synopsis A surface low over the atlantic waters northwest of
pr will continue to move north northeast into the western atlantic for
the next few days. A surface high will build across the western
atlantic just northwest of the surface low, spreading into the
local area by midweek as the surface low moves east into the
central atlantic. Drier air at mid levels is expected to continue
moving in through the end of the week. Light southerly winds will
continue until Monday, becoming very light on Tuesday, then
northerly and increasing on Wednesday and Thursday.

Short term Today through Wednesday...

a few showers are forming in northern puerto rico due to local sea
breeze convergence with the southerly flow. A band of showers has
been quasi stationary from about 12 miles south of arroyo to the
western tip of vieques and through the passage between puerto rico
and culebra to the northeast since about 26/08z. In the last hour or
so showers have also formed between 6 and 15 miles south of the
coast of puerto rico as far west as guanica. This band is being
maintained by the flow out of the south and into a low pressure that
formed on Friday north of the eastern tip of the dominican republic.

The low is located moving north at about 360 miles north of punta
cana at 9 knots. The models have had no precision in locating the
location of this band and tend to show the showers associated with
it more diffusely across the area. Higher resolution models tend to
agree that some showers will persist between puerto rico and saint
croix in a northeast-southeast band through Tuesday. As the low
moves more to the east Monday and Tuesday, flow around it will
come from the north in the local area and this band will
begin to dissipate as drier air moves in from the north on
Wednesday. That drier air will initiate a significant drying and
clearing trend.

Interaction between flow around the low to the north northeast and
the trade wind flow through the caribbean will keep a col lurking
close by so that local low level flow will be light and often
governed by local sea/land breezes. Moisture at lower levels will
persist so that local convergence patterns over puerto rico will
generate showers in the afternoons Monday and Tuesday over the
western interior which will drift north in the 850 mb flow into the
atlantic late in the afternoon and early in the evening. These will
leave some rains but heavy amounts with flooding are not expected
owing to the limited instability of the sounding and general
dryness in the mid levels.

Long term Northerly winds and drier conditions expected on
Thursday, which if it verifies would be a pleasant day with max
temps in the low 80s across the lower elevations and dew points in
the mid 60s. Thereafter winds will turn easterly for Friday and
Saturday but still somewhat dry. However, a lone of enhanced
moisture could move through on Sunday and Monday, which will cause
an increase in the shower activity over the local area once again.

Aviation Vfr conditions prevail. Areas of shra have initiated
over NRN pr and may spawn isold tsra bfr 26/22z. Areas of mtn
obscurations some of which have not cleared from this morning will
persist til 26/02z. Local brief MVFR arnd tjbq, tjmz and tjsj is
psbl. Otherwise TAF sites to continueVFR except for brief MVFR cigs
in shra arnd tncm/tkpk btwn 25/19-26/09z. Winds alf s-sw 10 to 20 kt
up thru fl150. MAX winds wsw 70 kts at fl400 decreasing slightly
thru 27/18z.

Marine Local buoy 41115 in rincon is still reporting seas of up
to 7 feet, for that reason a small craft advisory was issued for
the atlantic waters, waters of NW pr and the mona passage through
this evening and then through 2 am ast Monday for the atlantic
offshore waters. The rest of the waters should be up to 6 feet
tonight. High risk of rip currents continue this afternoon and

Preliminary point temps/pops
Sju 74 88 77 85 / 40 50 40 40
stt 75 85 75 82 / 50 50 40 40

Sju watches/warnings/advisories
Pr... High rip current risk until 6 pm ast this evening for culebra-
mayaguez and vicinity-northeast-southeast.

High rip current risk through late tonight for north central-
northwest-san juan and vicinity-western interior.

Vi... None.

Am... Small craft advisory until 8 pm ast this evening for coastal
waters of northwestern puerto rico out 10 nm-coastal waters
of northern puerto rico out 10 nm-mona passage southward to

Small craft advisory until 2 am ast Monday for atlantic waters
of puerto rico and usvi from 10 nm to 19.5n.

Short term... Ws
long term... .Ja

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
42085 - Southeast of Ponce, PR 15 mi45 min ESE 3.9 G 5.8 81°F 81°F3 ft1012.5 hPa (+1.8)
IMGP4 15 mi30 min SSE 1.9 G 5.1 80°F
MGIP4 - 9759110 - Magueyes Islands, PR 15 mi45 min S 4.1 G 5.1 80°F 81°F1012.8 hPa (+1.5)
MGZP4 - 9759394 - Mayaguez, PR 27 mi45 min SE 2.9 G 5.1 80°F 83°F1012.6 hPa (+1.7)
JOXP4 - Jobos Bay Reserve, Puerto Rico 29 mi60 min NE 1 77°F 1014 hPa74°F
AROP4 - 9757809 - Arecibo, PR 35 mi45 min ESE 2.9 G 4.1 79°F
PTRP4 37 mi30 min S 1.9 G 2.9 76°F
41115 - Rincon, Puerto Rico (181) 39 mi52 min 80°F6 ft
SJNP4 - 9755371 - San Juan, PR 48 mi45 min SSW 6 G 8 79°F 82°F1013.2 hPa (+1.9)
YABP4 - 9754228 - Yabucoa Harbor, PR 49 mi45 min Calm G 1
41053 - San Juan, PR 49 mi45 min SSW 5.8 G 9.7 80°F 80°F5 ft1012.5 hPa (+2.0)

Wind History for Penuelas (Punta Guayanilla), PR
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Ponce, Mercedita Airport, PR10 mi2.9 hrsSSW 610.00 miPartly Cloudy82°F75°F79%1013.2 hPa

Wind History from JPS (wind in knots)
Last 24hr--------NE5Calm--CalmCalm--Calm------------------------SW6
1 day ago--------SW6Calm--E6E7--E10--------------------------
2 days ago--------CalmCalm--CalmCalmCalm----------------------------

Tide / Current Tables for Punta Guayanilla, Puerto Rico
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Punta Guayanilla
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Sun -- 12:00 AM AST     0.09 feet Low Tide
Sun -- 05:20 AM AST     Moonrise
Sun -- 06:26 AM AST     Sunrise
Sun -- 09:02 AM AST     0.40 feet High Tide
Sun -- 04:55 PM AST     0.18 feet Low Tide
Sun -- 05:27 PM AST     Moonset
Sun -- 06:39 PM AST     Sunset
Sun -- 08:51 PM AST     0.22 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Guanica, Puerto Rico
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Click for Map
Sun -- 12:41 AM AST     0.07 feet Low Tide
Sun -- 05:21 AM AST     Moonrise
Sun -- 06:26 AM AST     Sunrise
Sun -- 07:08 AM AST     0.41 feet High Tide
Sun -- 04:02 PM AST     0.16 feet Low Tide
Sun -- 05:28 PM AST     Moonset
Sun -- 06:39 PM AST     Sunset
Sun -- 06:44 PM AST     0.21 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of Puerto Rico    EDIT

Wind Forecast for (20,4,5,8)
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Ground Weather Radar Station Puerto Rico,Virgin Islands
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weather_mapweather_map weather_map

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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 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 numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at 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.