Marine Weather and Tides
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|Sunrise 6:04AM||Sunset 7:14PM||Wednesday July 17, 2019 12:20 PM AST (16:20 UTC)||Moonrise 8:03PM||Moonset 6:35AM||Illumination 100%|
7 Day Forecast for Marine Location Near Rinc�n, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 171527|
area forecast discussion
national weather service san juan pr
1127 am ast Wed jul 17 2019
Update Minor changes were introduced to the short term forecast
to match current wx conditions. Overall, forecast on track, shower
and thunderstorm development still expected across the interior
and west puerto rico.
Aviation Vfr conds to continue through the morning hours. Brief
periods of MVFR conds are possible in and around jbq and jmz
between 17 16-22z in shra tsra. Easterly winds 15 to 20 knots
with higher wind gusts.
Marine Seas below 5 feet and winds 15 to 20 knots are expected
today. Small boat operators should exercise caution across the
atlantic and caribbean coastal waters.
Prev discussion issued 420 am ast Wed jul 17 2019
synopsis... A strong surface high pressure extending across the
north central atlantic will continue to dominate the local region
today and early Thursday. A tropical wave is forecast to move
across the local forecast area between Thursday and Friday.
Another tropical is expected to move across the caribbean waters
between Monday and Tuesday.
Short term... Today through Friday...
a strong surface high pressure extending across the north central
atlantic will maintain a moderate to locally fresh easterly wind
flow across the region. Under this flow, patches of low level
moisture will enhance shower activity across the region. This
activity will focus over the waters and coastal areas during the
overnight and morning hours. Although a slight erosion of the
available moisture is expected by late morning into the early
afternoon hours, diurnal heating and local effects will still
support the development of showers and isolated thunderstorms during
the afternoon hours, particularly along the interior and over
portions of western puerto rico. Streamer-like showers affecting
eastern puerto rico and the san juan metropolitan area from el
yunque and the local islands cannot be ruled out. However, lack of
upper level support, limited moisture content,and a strong steering
flow will limit the effects this activity may have over these areas.
A slight increase in shower and thunderstorm activity is expected on
Thursday into Friday as the next tropical wave move across the
caribbean and supports moisture advection into the forecast area.
Model-estimated pw values are expected to hold around 1.60 to 2.00
inches by Thursday afternoon and continuing on Friday. Given the
somewhat expected favorable upper level conditions and high moisture
content, there is a better chance for more widespread convection to
develop over the forecast area. As a result, there will be a higher
potential for urban and small stream flooding.
Long term... Saturday through Thursday...
lingering moisture will combine with diurnal heating and local
effects to cause more shower or thunderstorm development across
interior and western portions portions of puerto rico on
Saturday. A drier airmass and saharan dust will prevail over the
local region from Saturday night through Monday. On Monday another
tropical wave would reach the local area but the increase in
moisture with this wave appears to be modest, as much of the
moisture appears to remain south of the local area.
Aviation... Shra affecting usvi and northern pr terminals will
result in brief MVFR conditions through 17 08z. Thereafter, mainly
vfr conditions expected. Vcsh expected at leeward and usvi terminals
throughout the day. Afternoon convection will bring vcts vcsh to
tjmz tjps between 17 15-23z. This could result in brief MVFR
conditions. Light and variable winds through 17 14z, increasing to
15-20 knots with gusts up to 28 knots and turning from the east with
sea breeze variations.
Marine... Passing showers will continue to move across the local
waters through mid morning. These showers could generate wind gust
of between 20 to 25 knots. Mariners should expect winds in the
range of between 10 to 15 knots. Stronger winds could be
experience near the coast due to sea breeze enhancement,
therefore small craft operators should exercise caution along the
northern and southern coast of puerto rico.
Preliminary point temps pops
Sju 89 78 89 79 20 20 20 40
stt 89 79 89 79 20 20 20 40
Sju watches warnings advisories
Short term... 99
long term... .99
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|MISP4 - 9759938 - Mona Island, PR||70 mi||50 min||85°F||84°F||1018.9 hPa|
|MGZP4 - 9759394 - Mayaguez, PR||88 mi||50 min||1018.8 hPa|
Wind History for Mayaguez, PR(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Aquadilla, Rafael Hernandez Airport, PR||78 mi||30 min||ENE 12 G 15||10.00 mi||Partly Cloudy||84°F||75°F||74%||1019 hPa|
Wind History from JBQ (wind in knots)
|1 day ago||E|
|2 days ago||E|
EDIT Weekend mode (on/off) (on/off)  Help One Week of Data
EDIT (on/off)  Help One Week of Data
Weather Map and Satellite Images(on/off)  HelpWeather Map
GOES 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 (12,3,4,5)(on/off)  Help
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