Noaa san juan: Marine Conditions for Puerto Rico and U.S. Virgin Islands

Posted by alexxlab
April 10, 2023
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78526 San Juan, Puerto Rico

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Actual Wind	Anomalous Wind
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Relative Humidity	Theta-e (θ_e)
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Return to the Main Upper Air Page

Note regarding data shown above
Anomalous Wind: The wind barbs show the direction and speed of the wind
relative to the mean of this 15-day period. Colored contours illustrate the anomalous north-south
(meridional) component of wind. Positive values are indicated by warm colors (reds) and represent
an anomalous southerly wind component. Negative values are shown by
cool colors (blues or no coloring) and represent an anomalous northerly wind component.

San Juan Islands and Northern Inland Waters Marine Forecast :: MarineWeather.net

Area Forecast Discussion
National Weather Service Seattle WA
400am PST Monday Feb 27 2023

Synopsis
Cool upper level trough offshore through Tuesday. A couple of systems spinning out of the trough moving over Western Washington this morning and again Tuesday morning. Trough moving through the area Tuesday night. Weak upper level ridge providing a break Wednesday. Another front will arrive Thursday with another cold upper level trough taking up residence off the coast Friday through the weekend.

Short Term – Today through Wednesday
Satellite imagery shows weak upper level low embedded in the large scale upper level trough offshore this morning. High clouds out ahead of a system spinning out of the low over the southwest portion of the area. No precipitation echoes on the doppler radar over the forecast area at 11z/3am. Temperatures were in the upper 20s to mid 30s.

Little change in the forecast this morning with the unseasonably cool air mass remaining over Western Washington. 1000-850 mb thickness values remain below 1300 meters and 925 mb temperatures below 0C. Shortwave spinning out of the upper level low offshore southwest of the area early this morning will be rotating up over Western Washington later this morning. Showers will increase over the Southwest Interior, Lower Chehalis Valley and the Central Coast after 12z. With the low offshore weakening and the trough digging south the shortwave will have a hard time moving northward later this morning and will split and dissipate over Western Washington this afternoon. Air mass cold enough in the 12z-18z window to produce snow with the showers with the bulk of the shower activity from about a line from Tacoma to Shelton out to the North Coast southward. A winter weather advisory will remain in effect for most of these locations for up to 2 inches of snow this morning. Could see some snow in the air after 15z in the central Puget Sound but precipitation amounts are expected to be light. By afternoon the air mass will warm up enough to get the snow level up to a few hundred feet. Even with a slightly unstable air mass plenty of cloud cover will put a damper on daytime heating reducing the intensity of the showers making it unlikely the showers will drive the snow level back down to the surface for the lower elevations. Highs today near 40.

Upper level trough offshore moving inland late tonight into Tuesday morning with the trough axis along the coast by 18z Tuesday. Shower activity will increase as the trough axis approaches the area. Once again the air mass will cool overnight with temperatures in the lower to mid 30s by 12z Tuesday morning. Almost all of the showers will be in the form of snow from 06z Tuesday to 18z Tuesday. Precipitation amounts will be variable with the showers. In general expect a tenth to a quarter of an inch of water, 1 to 3 inches of snow, from about Snohomish county southward with up to a tenth of an inch of water, up to an inch of snow, in Skagit and Whatcom county. Like Sunday and today the air mass will warm up slightly in the afternoon lifting the snow level back up to around 500 feet. Shower activity will decrease with the exception of a possible convergence zone over Snohomish county. This could add another inch or two of snow to that area in the afternoon. Look for another winter weather advisory to be issued later today for late tonight and Tuesday morning. Lows Tuesday morning near 30 with highs near 40.

Upper level trough axis moving through Western Washington Tuesday night with dry north northeasterly flow aloft developing. Shower activity drying up Tuesday evening with just a few mountain showers for the late night and early morning hours. A little less cloud cover Tuesday night will allow temperatures to drop into the 20s in most places.

Temporary upper level ridge passing through Western Washington Wednesday providing a little break in the weather. Light surface gradients will keep clouds in the forecast for the morning hours. The lower clouds will give way to increasing high clouds in the afternoon. End result a partly sunny day. The air mass over the area will remain unseasonably cool with highs only in the lower to mid 40s.

Long Term – Thursday Through Sunday
Extended models in good agreement with another system moving down the British Columbia coast arriving Thursday. A little push of warm air ahead of the front will get the snow levels up to over 1000 feet. This system looks to be a good snow producer for the Cascades with a foot or so of new snow. Behind the front yet another cold upper level trough takes up residence off the coast. A series of shortwaves will spin out of the trough and move through the area Friday into the weekend. The models this morning are just a touch warmer then previous runs keeping snow levels up in the 500 to 1000 foot range. Still think that is a little bit of climatology in the models. Either way the snow levels will be low enough in the late night and morning hours to at least have the mention of snow in the forecast through the weekend. Like the previous runs the models keep the cold trough over the area in the 8 to 10 day period with no signs of temperatures warming back up to normal.

Marine
A low pressure system will track across the coastal waters today before moving inland tonight into early Tuesday. Easterly winds will increase across the coastal waters and along the Strait of Juan de Fuca this morning as a result. Latest observations also have seas hovering between 10-12 feet across the coastal waters and the West Entrance of the Strait. Thus, small craft advisories remain in effect for these areas for a combination of winds and seas through this evening. Winds are also expected to pick up across the eastern and central portions of the Strait this morning, so have issued a small craft advisory for these areas as well that persists through the afternoon hours. Winds across the coastal waters look to remain gusty as the low pressure system makes its way inland, but are expected to gradually ease on Tuesday.

High pressure will then briefly build into the area waters on Wednesday, bringing some calmer conditions to the area waters. This break will remain short, however, as another frontal system is slated to move across the waters on Thursday and bring another round of headlines to the region.

Seas across the coastal waters are currently at 10-12 ft and will gradually subside to below 10 feet on Tuesday. Expect seas to remain under 10 feet through midweek, before building to 12-16 feet by late week. 14

Hydrology
No river flooding expected in the next 7 days.

NOAA Seattle WA Office: Watches – Warnings – Advisories
WA…Winter Weather Advisory until 10am PST this morning for Bremerton and Vicinity-Central Coast-Hood Canal Area-Lower Chehalis Valley Area-North Coast-Southwest Interior.

PZ…Small Craft Advisory until 10pm PST this evening for
Coastal Waters From Cape Flattery To James Island 10 To 60 Nm-
Coastal Waters From Cape Flattery To James Island Out 10 Nm-
Coastal Waters From James Island To Point Grenville 10 To 60 Nm-
Coastal Waters From James Island To Point Grenville Out 10 Nm-
Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm-
Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm
Grays Harbor Bar-
West Entrance USA Waters Strait Of Juan De Fuca.

Small Craft Advisory from 7am this morning to 4pm PST this afternoon for
Central U.S. Waters Strait Of Juan De Fuca-
East Entrance U.S. Waters Strait Of Juan De Fuca.

San Juan Pacific Water Temperature Today

Peru > Ica

San Juan

Paracas, Peru | © Angie Morales

The most detailed information about water temperature in San Juan in Pacific Ocean (Ica, Peru).

Forecast of changes in water temperature for the next 10 days. Statistical data by months for the last years. Information about neighboring resorts. Weather forecast for San Juan for a week.

Analysis and forecast

The water temperature today is slightly lower than the average on this day in recent years. Its value has grown over the past week, but has fallen compared to 20 days ago. Exactly one year ago on this day, the water temperature in this place was 21°C. The range of water temperatures in San Juan in February is from 18 to 24 degrees.

According to our forecast, in the next few days the temperature of sea water in San Juan will decrease slightly and will reach 19.3°C in 10 days.

Table of water temperature values in San Juan

day

FACTION*

Average **

Forecast ***

° C

FEB 20	21.1 ° C
Feb 21	19.8°C	21.0°C
FEB 22	20. 1 ° C	20.8 ° C
FEB 23	20.5 ° C	21.5 ° C
FEB 24	20.6 ° C 9002.8 C 9002 ° C 9002
Feb 25	19.3°C	20.8°C
Feb 26	19.4°C	21.5°C
Feb 27	19.6°C	21.3°C
Feb 28		20.8 ° C	19.1 ° C
Mar 1		21.0 ° C	19.3 ° C
MAR 3		21.3	Mar 5	20.8 ° C	19.1 ° C
MAR 6		21.0 ° C	19.3 ° C

* Actual importance – Average water temperature on this day in previous years
*** Forecast – Our forecast water temperature

Actual sea water temperatures near the shore can differ by several degrees from these indicated values. This can be noticeable after heavy rain or after long periods of strong winds. Some downwinds cause cold deep waters to replace surface waters that have been heated by the sun.

To develop a forecast, we use our own mathematical model, which takes into account the current change in water temperature, historical data and main weather trends, wind strength and direction, air temperature in each specific region. We also consider data for other resorts in Peru.

Gorleston-on-Sea, UK | © Margason Fam

San Juan annual average water temperature chart

San Juan water temperature monthly

San Juan is located beyond the Antarctic Circle, at a latitude of 15 degrees. The water temperature here is comfortable for swimming in 5 months of the year: in January, in February, in March, in April, in October, in December. The average annual water temperature along the coast in San Juan is 18.1°C, according to the seasons: in winter 16.1°C, in spring 16.3°C, in summer 20. 8°C, in autumn 19.3°C. The minimum water temperature (14.5°C) in San Juan is in August, the maximum (22.8°C) in January.

You can find out detailed data on how water temperature in San Juan changes each month:

Pacific Ocean

Local time

09:01

Empittic zone

UTC-5

sunrise

06:00

Sunset

18:26 9000 Neighboring cities and resorts

Point

Water*

Distance **

Puerto de Lomas

18.9 ° C

40KM

9000* Temperature of water in this place today
** Straight-line distance in kilometers

Teirua, New Zealand | © Mark Stirling

The warmest sea water today in Peru was recorded in Tumbes and its value is 27.1°C. The lowest point is in Chala where the water temperature is currently 18.3°C. The average water temperature in the country today is 22.1°C.

Data for seawater temperature in San Juan and neighboring cities and resorts collected from various sources, using buoys, uses satellite map of temperatures provided by the NOAA.

To provide a more accurate representation of temperatures, we use data from various local services in each specific region of the world.

The nearest airport in a straight line is 1 km away. This is San Juan Aposento Airport (APE). We do not have information as to whether it is active and what flights it accepts or sends.

San Juan weather forecast

Weather forecast shown in local time in San Juan

TODAY

10:00

23.8 ° C

19km/h

is felt as 23.3 ° C, cloudy (cloudy: 85-100%)
Militia: 83%, clouds: 93%

13:00

24.3 ° C

21km 21km /h

feels like 24.1°C, Cloudy (Cloudy: 85-100%)
Humidity: 79%, Cloudy: 94%

16:00

23.9°C

C, Cloudy (broken clouds: 51-84%)
humidity: 78%, clouds: 76%

19:00

22.6°C

21km/h

feels like 23. 1°C, Cloudy (broken clouds: 51-84%)
Humidity: 83%, clouds: 63%

22:00

22.4°C

9005 feels like 22.9°C, Cloudy (Cloudy: 85-100%)
Humidity: 84%, Cloudy: 100%

Feb 28

01:00

22.2°C

22.7°C, Cloudy (Cloudy: 85-100%)
Humidity: 86%, Cloudy: 100%

04:00

21.9°C

18km/h

feels like 22.4°C, cloudy (overcast: 85-100%)
humidity: 88%, cloudy: 100%

feels like 22.5°C, Cloudy (overcast: 85-100%)
Humidity: 88%, Cloudy: 100%

10:00

23.4°C

(Cloudy: 85-100%)
Humidity: 79%, Clouds: 100%

13:00

24.0°C

21km/h

Feels like 24.5°C, Cloudy (Cloudy: 85-100%)
Humidity: 76%, Clouds: 100%

16:00

23.6°C

Cloudy (Cloudy: 85-100%)
Humidity: 78% Cloudy: 94%

19:00

22. 6°C

23km/h

Feels like 23.1°C, Cloudy (Cloudy: 85%0: 8 )
Humidity: 83%, Clouds: 97%0188 Humidity: 84%, Clouds: 95%

March 1st

01:00

22.0°C

23km/h

feels like 22.6°C, Cloudy (Cloudy: 808%) 85-108% %, clouds: 98%

04:00

21.8°C

23km/h

feels like 22.4°C, Cloudy (overcast: 85-100%)
Humidity: 89%, clouds: 9002% 9002 22.4°C0188 humidity: 88%, clouds: 100%

10:00

23.1°C

19km/h

feels like 23.6°C, cloudy (overcast: 85-100%)
, clouds: 81% 24.0°C

23.7°C

22km/h

feels like 24.2°C, cloudy (broken clouds: 51-84%)
humidity: 78%, clouds: 84%

19:00

22.4°C

23km/h

Feels like 22.9°C 22.3°C

18km/h

feels like 22. 8°C, Cloudy (Cloudy: 85-100%)
Humidity: 84%, Cloudy: 98%

Mar 2

01:00

21.9°C

17km/h

Feels like 22.4°C, Cloudy (Cloudy: 85-100%)
Humidity: 86%, Cloudy: 93%

04:00

21.7°C

16km/h

feels like 22.2°C, Cloudy (Cloudy: 85-100%)
Humidity: 88%, Clouds: 9:0005

21.9°C

15km/h

feels like 22.4°C, Cloudy (Cloudy: 85-100%)
Humidity: 86%, Cloudy: 100%