Wednesday, September20, 2017 L-36.com


Marine Weather and Tides
Potrero, 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 6:32AMSunset 6:45PM Wednesday September 20, 2017 9:37 AM PDT (16:37 UTC) Moonrise 6:56AMMoonset 7:24PM 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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PZZ750 Coastal Waters From San Mateo Point To The Mexican Border And Out To 30 Nm- 147 Am Pdt Wed Sep 20 2017
Today..Wind S 10 kt. Wind waves 2 ft or less. Mixed swell W 3 ft at 9 seconds and sw 2 ft at 11 seconds.
Tonight..Wind S 10 kt. Gusts to 15 kt after midnight. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft at 9 seconds and sw 2 ft at 11 seconds.
Thu..Wind S 10 kt...becoming W in the afternoon. Gusts to 20 kt. Wind waves 2 ft or less...becoming 3 ft in the afternoon. Mixed swell W 3 to 5 ft at 8 seconds and sw 1 ft at 14 seconds. Slight chance of showers.
Thu night..Wind W 10 to 15 kt with gusts to 20 kt. Wind waves 3 ft in the evening...becoming 2 ft or less. Mixed swell W 5 to 6 ft at 8 seconds and sw 1 ft at 14 seconds.
Fri..Wind S 10 to 15 kt...becoming W in the afternoon. Gusts to 20 kt. Wind waves 2 ft or less. SWell W 4 to 6 ft at 9 seconds. SWell S 1 ft.
Fri night..Wind W 10 to 15 kt with gusts to 20 kt. Wind waves 3 ft in the evening...becoming 2 ft or less. SWell W 3 to 5 ft. SWell sw 1 ft.
Sat..Wind S 10 kt...becoming W in the afternoon. Wind waves 2 ft or less. Mixed swell W 3 to 4 ft and sw 1 ft.
Sat night..Wind nw 10 kt with gusts to 15 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 to 15 kt in the afternoon. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft and S 1 ft.
Sun night..Wind nw 10 to 15 kt with gusts to 20 kt in the evening...becoming variable less than 10 kt. Wind waves 3 ft in the evening...becoming 2 ft or less. Mixed swell W 1 to 2 ft and S 1 ft.
PZZ700 147 Am Pdt Wed Sep 20 2017
Synopsis for the far southern california coast.. At 1 am, a 1031 mb high was 1300 nm west-northwest of san francisco and a 1004 mb low was near needles. A coastal eddy looks likely to develop today and continue into early Thursday. A trough of low pressure will then bring moderate to locally strong northwest winds by Thursday afternoon, with brisk winds continuing through Friday night, especially in the outer waters where conditions may be hazardous to small craft. Weak to moderate onshore flow then looks to occur this weekend.

7 Day Forecast for Marine Location Near Potrero, CA
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location: 31.69, -116.65     debug


Area Discussion for - San Diego, CA
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Fxus66 ksgx 200918
afdsgx
area forecast discussion
national weather service san diego ca
218 am pdt Wed sep 20 2017

Synopsis
A deep low pressure trough will bring cooler weather through
Friday, along with mostly cloudy nights and partly cloudy days.

There is a slight chance of showers Thursday. Strong westerly
winds are expected in the mountains and deserts especially
Thursday. Higher pressure and offshore flow develop over the
weekend and next week leading to clear skies and warmer weather.

Discussion For extreme southwestern california including orange...

san diego... Western riverside and southwestern san bernardino
counties...

low clouds have settled into most of the coastal basin this
morning, but curiously the massive cloud deck north and west of
our region has disappeared. This is probably in response to the
cooler air aloft that has begun to erode our marine inversion,
which makes it hard for low clouds to form. Clouds will generally
break up today, but could persist in some areas. Clouds will
gather quickly this evening. An unseasonably deep trough will
drop out of washington down the west coast today and Thursday.

This will increase the onshore flow and strengthen our coastal
eddy. There is a weak front-like feature that pushes through
southern california Thursday late morning. It looks capable of
producing light showers anywhere from the coast to the mountain
crests. Some foothill locations might get more than a tenth inch,
but only a hundredth or two is most likely in the lower
elevations. Winds will crank up as well in the mountains and
deserts Thursday afternoon and evening. Top gusts in the top
spots, such as through mountain passes and adjacently downwind,
will exceed 50 mph, but most areas will stay under 45 mph.

Temperatures will be mostly in the 70s, but 80s in the lower
desert Thursday and Friday. That's 15-20 degrees below average for
inland areas. On Friday the marine layer clouds will not be as
solid, and even less so into Saturday. Most clouds on Friday will
migrate inland and into foothills. Mother nature is monitoring the
calendar as we head into fall and has appropriately ordered up
some fall weather with an offshore flavor. As the trough axis
moves through california Friday and Saturday, dry northerly flow
aloft develops and surface pressure gradients align into the
offshore setup. That should take care of any residual clouds this
weekend. Northeast winds will develop Sunday through and below
the mountain passes into the inland valleys, mainly below cajon
pass. Winds don't appear overly strong, although top spots around
rialto could gust to 40 mph during the mornings through Tuesday.

Skies will turn crystal clear and humidity will go way down.

Temperatures will climb each day next week, into the 80s and lower
90s at lower elevations by Tuesday. The warmup will be most
notable west of the mountains as would be expected with offshore
flow, but the dry air and the cool nights will make the warm
weather fairly comfortable.

Aviation
200914z... Coast valleys coastal slopes... Bkn-ovc stratus will
continue to fill in over the coast, valleys, and lower coastal
slopes through 1500 utc, with bases 2500-3500 ft msl, tops around
4000 ft msl, local vis 3-5 sm, and mountain obscuration of the
coastal slopes. Forecast marine layer inversion strength of around 6
deg c at 1200 utc. 1500-21 0000 utc, stratus likely gradually
clearing, although there's a chance that some areas may only
partially clear. However, any CIGS that occur should be mostly above
3000 ft msl. 21 0000-1500 utc, stratus re-developing over the coast,
valleys, coastal slopes and into the passes, with bases 2500-4000 ft
msl, tops up to 5000 ft msl, possible -dz -shra and mountain
obscuration of coastal slopes.

Mountain ridges desert slopes deserts... Mostly skc with p6sm vis
through tonight. After 21 0000 utc, west winds 20-30 kt with gusts
40 kt will create mod-stg uddfs llws, and surface winds at kpsp and
ktrm could gust to 30 kt at times.

Marine
Northwest wind gusts increasing to 25 kt Thursday afternoon through
Friday. This, in addition a steep west-northwest swell of 6-8 ft 7-9
seconds, will likely result in hazardous conditions for small craft
in the outer waters. Northwest winds will weaken this weekend with
seas falling to 2-4 ft.

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

Sgx watches warnings advisories
Ca... None.

Pz... None.

Public... Mm
aviation marine... Harrison


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TIXC1 - Tijuana River Reserve, CA 66 mi112 min SSW 5.1 67°F 1014 hPa60°F
SDBC1 - 9410170 - San Diego, CA 76 mi49 min 72°F1013.7 hPa

Wind History for USS MIDWAY South Navy Pier, San Diego, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Diego, Brown Field Municipal Airport, CA64 mi44 minSE 78.00 miMostly Cloudy70°F57°F66%1013 hPa

Wind History from SDM (wind in knots)
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Last 24hrS3NW4W8W7W12W7W9SW9W6W6W7CalmW4W4W5CalmW3S4CalmCalmSE4SE4SE4SE7
1 day ago36W7W8W9W95W7W5W6NW3CalmW3W4CalmCalmCalmCalmCalmCalmCalmCalmN3NE3
2 days ago3W9W10W9
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W9W9W8W7W7W6W5W3N4CalmCalmCalmCalmCalmCalmCalmNW44

Tide / Current Tables for Ensenada, Baja California Norte, Mexico
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Ensenada
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Wed -- 03:37 AM PDT     0.00 meters Low Tide
Wed -- 06:33 AM PDT     Sunrise
Wed -- 06:56 AM PDT     Moonrise
Wed -- 09:51 AM PDT     1.61 meters High Tide
Wed -- 03:50 PM PDT     0.19 meters Low Tide
Wed -- 06:45 PM PDT     Sunset
Wed -- 07:23 PM PDT     Moonset
Wed -- 09:55 PM PDT     1.64 meters High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.10.60.3000.20.50.91.31.51.61.51.20.80.50.30.20.30.60.91.31.61.61.5

Tide / Current Tables for Imperial Beach, California
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Imperial Beach
Click for Map
Wed -- 03:59 AM PDT     -0.20 feet Low Tide
Wed -- 06:35 AM PDT     Sunrise
Wed -- 06:58 AM PDT     Moonrise
Wed -- 10:14 AM PDT     5.60 feet High Tide
Wed -- 04:13 PM PDT     0.43 feet Low Tide
Wed -- 06:47 PM PDT     Sunset
Wed -- 07:25 PM PDT     Moonset
Wed -- 10:21 PM PDT     5.61 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.12.61.20.2-0.20.21.22.645.15.65.44.63.320.90.40.61.42.63.955.65.5

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

GOES Local Image of Southwest    EDIT
Geos

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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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 numerious 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.