Wednesday, October18, 2017

Marine Weather and Tides
La Presa, CA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
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.

Sunrise 6:54AMSunset 6:11PM Wednesday October 18, 2017 9:55 AM PDT (16:55 UTC) Moonrise 5:46AMMoonset 5:58PM Illumination 3% Phase: Waning Crescent; Moon at 28 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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PZZ750 Coastal Waters From San Mateo Point To The Mexican Border And Out To 30 Nm- 204 Am Pdt Wed Oct 18 2017
Today..Wind variable less than 10 kt...becoming W 10 kt in the afternoon. Wind waves 2 ft or less. Mixed swell W 2 ft at 6 seconds and sw 3 ft at 16 seconds.
Tonight..Wind sw to 10 kt. Wind waves 2 ft or less. Mixed swell W 2 ft at 6 seconds and sw 3 ft at 15 seconds.
Thu..Wind variable less than 10 kt...becoming W 10 kt with gusts to 15 kt in the afternoon. Wind waves 2 ft or less. Mixed swell W 2 ft at 6 seconds and sw 2 to 3 ft at 15 seconds.
Thu night..Wind W 10 to 15 kt. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft at 7 seconds and sw 2 to 3 ft at 14 seconds. Patchy drizzle after midnight.
Fri..Wind W 10 to 15 kt with gusts to 20 kt. Wind waves 2 ft or less...becoming 3 ft in the afternoon. Mixed swell W 3 to 4 ft at 8 seconds and sw 2 ft at 13 seconds. Patchy drizzle in the morning.
Fri night..Wind nw 10 to 15 kt...becoming W after midnight. Gusts to 20 kt. Wind waves 3 ft in the evening...becoming 2 ft or less. Mixed swell W 4 to 5 ft and sw 1 to 2 ft.
Sat..Wind se 10 kt...becoming W with gusts to 15 kt in the afternoon. Wind waves 2 ft or less. Mixed swell W 3 to 4 ft and S 1 ft.
Sat night..Wind nw 10 kt in the evening... Becoming variable less than 10 kt. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft and S 1 ft.
Sun..Wind variable less than 10 kt...becoming W 10 kt with gusts to 15 kt in the afternoon. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft and S 2 ft.
Sun night..Wind N 10 kt. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft and S 2 ft.
PZZ700 204 Am Pdt Wed Oct 18 2017
Synopsis for the far southern california coast..At 1 am, a 1023 mb high was over southern oregon and a 1010 mb low was southwest of needles, california. Light to moderate northwest winds will continue most of the rest of this week. A low pressure system could bring wind gusts to 25 knots late Thursday night and Friday. An elevated short period northwest swell could bring rough seas Friday and Saturday.

7 Day Forecast for Marine Location Near La Presa, CA
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location: 32.72, -117     debug

Area Discussion for - San Diego, CA
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Fxus66 ksgx 181546
area forecast discussion
national weather service san diego ca
846 am pdt Wed oct 18 2017

A deepening trough over the west will bring a cooling trend and a
deepening marine layer through Friday. Expect night and morning
marine layer clouds over the coast and western valleys tonight and
Thursday morning and then over the coast, valleys and coastal
slopes with possible drizzle Thursday night and Friday morning.

Strong and gusty west winds also likely in the mountains and
deserts Thursday and Friday. Santa ana winds and a building strong
ridge of high pressure will bring significant warming and drying
to the region Saturday through Monday. Hot conditions possible all
the way to the coast Sunday and Monday, with weather almost as hot
on Tuesday except at the coast where some cooling may occur.

Discussion For extreme southwestern california including orange...

san diego... Western riverside and southwestern san bernardino

a weakening upper level short-wave trough moving through san
bernardino county is noted on the morning water vapor satellite
imagery, bringing some mid and high level clouds and not much
else. Models have continued to back off on the instability,
moisture and lift associated with this trough, so we are no longer
expecting any elevated showers thunderstorms in our forecast area
today. Humidity observations at the coast indicate dew points in
the 50s 60s, which shows that the marine layer has finally
returned. The 12z miramar sounding shows a surface based marine
layer inversion and a moist layer from around 700 mb to 400 mb.

Pressure gradients continue to trend onshore this morning, with
the san diego to thermal gradient up to 3.4 mb onshore, while 24
hours ago it was only 1.3 mb onshore. With the return of onshore
flow and large scale trough deepening over the pacific northwest,
expect today to be the start of a cooling trend for southern
california (although highs today will still be several degrees
above normal). Local WRF shows that marine layer stratus fog will
likely develop tonight in the coast and western valleys, with
help from a coastal eddy.

The cooling trend will continue through Friday as the trough
continues to deepen and move inland, with possibly enough lift and
moisture for some drizzle and or light showers over and west of
the coastal slopes Friday morning. Expect highs 5-10 degrees
below normal by Friday. Onshore flow will strengthen as well, with
onshore pressure gradients forecast to reach around 10 mb from san
diego to las vegas on Friday, so expect west winds gusting 35-45
mph with local gusts to 50 mph in the mountains and deserts
Thursday and Friday. The marine layer will continue to deepen as
well (up to 4000-4500 ft msl), with stratus filling the coastal
basin and likely moving into the passes and coastal slopes
Thursday night Friday morning and again Friday night before
offshore winds clear clouds out from the north Saturday morning.

On Saturday, surface high pressure over the great basin will build
in the wake of the trough that moves over that area. This will
create offshore pressure gradients at around 7 mb from san diego
to tonopah, resulting in weak santa ana winds that day. A building
ridge from the southwest, in addition to the santa ana winds, will
result in significant warming that day in the coast and valleys,
as well as clearing out the marine layer. The ridge will will
continue to build over the region Sunday through Monday, becoming
anomalously strong by Monday with 500 mb heights reaching 597 dm
according to the ECMWF and canadian models (gfs is weaker at
around 595 dm). Although they do not look strong at the moment
(offshore pressure gradients from san diego to tonopah increasing
to 10 mb with 850 mb winds of only 10-15 kt), the santa ana winds
will continue as well, bringing hot weather all the way to the
coast. The ECMWF also shows 850 mb temperatures reaching 25 deg c
on Monday, which translates to 103+ degree surface temperatures
west of the mountains. Once again, the GFS isn't as warm, showing
850 mb temperatures around 23-24 deg c. Although we start to trend
back onshore on Tuesday (which means it should be cooler at the
coast that day), the ridge could be almost as strong which means
that inland areas may be almost as hot as they were on Monday, and
in the case of the mountains and deserts they may be even hotter.

181545z... Sct clouds above 15000 ft will continue today, then mostly
decrease tonight.

Near the coast, stratus will likely return this evening and continue
until Thursday morning. Bases will likely be somewhere between 500
and 1000 ft msl, though cig height and timing are somewhat low
confidence. There is a chance of fog with visibilities below 3 miles
over higher coastal terrain late tonight and early Thursday.

No hazardous marine weather is expected through Thursday. Winds will
increase to 20-25 kt in the outer coastal waters late Thursday night
and Friday, decreasing by Saturday.

A south-southwest swell from 200 degrees from 3-4 ft 16-17 seconds
will continue today. This will produce 3-6 ft surf with sets to 7 ft
over orange county and northern san diego county. Highest surf will
be on southwest facing beaches. Strong rip and longshore currents
will accompany the elevated surf. Swell and surf will lower Thursday
but some surf to 6 ft with strong rip currents will continue. The
beach hazard statement continues for this return until 5 pm

Fire weather
Increasingly cool and more humid today through Friday as a trough
moves in over the west. Gusty westerly onshore winds in mountains
and deserts Thursday and Friday, with gusts 30-40 mph and local
50 mph.

Another round of possibly moderate strength santa ana winds
likely Saturday through at least Monday, with day-time humidity
falling down to at or below 10 percent Sunday and Monday (with
very poor overnight recoveries) along with hot conditions and
gusty northeast winds (15-25 mph gusting 35-45 mph). This would
likely result in critical fire weather conditions through and
below the mountain passes and into the coastal slopes and
foothills Sunday through Monday, and possibly into Tuesday as

Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.

Sgx watches warnings advisories
Ca... Beach hazards statement through Thursday afternoon for orange
county coastal areas-san diego county coastal areas.

Pz... None.

Public fire weather... Harrison
aviation marine... Maxwell

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SDBC1 - 9410170 - San Diego, CA 9 mi38 min 73°F1015.3 hPa
TIXC1 - Tijuana River Reserve, CA 12 mi71 min S 4.1 69°F 1015 hPa64°F
LJPC1 - La Jolla, CA (073) 17 mi36 min S 6 2 ft
LJAC1 - 9410230 - La Jolla, CA 17 mi44 min W 1.9 G 11 75°F 71°F1013.8 hPa
46254 17 mi38 min 69°F2 ft
46225 - Torrey Pines Outer, CA (100) 25 mi65 min 70°F5 ft
46232 - Point Loma South, CA (191) 26 mi45 min 70°F5 ft
46258 27 mi26 min 71°F4 ft
46224 - Oceanside Offshore, CA (045) 40 mi26 min 69°F5 ft
46242 - Camp Pendleton Nearshore, CA (043) 42 mi88 min 67°F4 ft

Wind History for USS MIDWAY South Navy Pier, San Diego, CA
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Gillespie Field Airport, CA8 mi65 minN 010.00 miClear68°F44°F43%1014.6 hPa
San Diego, San Diego International-Lindbergh Field, CA9 mi65 minS 1010.00 miPartly Cloudy73°F54°F51%1014.8 hPa
San Diego, Montgomery Field, CA10 mi63 minSSE 410.00 miFair79°F46°F31%1014.1 hPa
San Diego, Brown Field Municipal Airport, CA10 mi63 minSE 89.00 miFair79°F39°F25%1014.2 hPa
San Diego, North Island, Naval Air Station, CA11 mi2.1 hrsN 07.00 miPartly Cloudy67°F66°F97%1013.8 hPa
Imperial Beach Naval Outlying Field - Ream Field, CA12 mi60 minSW 67.00 miPartly Cloudy71°F57°F63%1014.8 hPa
San Diego, Miramar MCAS/Mitscher Field Airport, CA14 mi2 hrsE 510.00 miPartly Cloudy75°F45°F34%1013.5 hPa
Ramona, Ramona Airport, CA23 mi63 minE 510.00 miFair77°F35°F22%1014.4 hPa

Wind History from SEE (wind in knots)
Last 24hrCalmCalmCalm5666W7W5--CalmCalmNW5CalmCalmNW4CalmCalmCalmCalmNW4Calm--Calm
1 day agoCalmCalm--W8W10--W13W11SW4SW6SW8--CalmNW3NW3CalmCalmCalmCalmCalmCalmNW4CalmCalm
2 days agoCalmCalmCalm6W76W8W56CalmCalmCalmW5CalmCalmCalmCalmW3CalmCalmCalmCalmCalmCalm

Tide / Current Tables for National City, San Diego Bay, California
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National City
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Wed -- 03:07 AM PDT     0.18 feet Low Tide
Wed -- 05:45 AM PDT     Moonrise
Wed -- 06:55 AM PDT     Sunrise
Wed -- 09:16 AM PDT     6.48 feet High Tide
Wed -- 03:39 PM PDT     0.10 feet Low Tide
Wed -- 05:58 PM PDT     Moonset
Wed -- 06:11 PM PDT     Sunset
Wed -- 09:36 PM PDT     5.71 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for San Diego Bay Entrance, California Current
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San Diego Bay Entrance
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Wed -- 12:14 AM PDT     -2.05 knots Max Ebb
Wed -- 03:27 AM PDT     0.00 knots Slack
Wed -- 05:46 AM PDT     Moonrise
Wed -- 06:36 AM PDT     1.93 knots Max Flood
Wed -- 06:55 AM PDT     Sunrise
Wed -- 09:32 AM PDT     -0.00 knots Slack
Wed -- 12:36 PM PDT     -2.16 knots Max Ebb
Wed -- 03:56 PM PDT     0.00 knots Slack
Wed -- 05:58 PM PDT     Moonset
Wed -- 06:11 PM PDT     Sunset
Wed -- 06:58 PM PDT     1.78 knots Max Flood
Wed -- 09:52 PM PDT     -0.00 knots Slack
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 Southwest    EDIT

Wind Forecast for San Diego, CA (12,3,4,5)
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Ground Weather Radar Station San Diego, CA
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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.