Sunday, December15, 2019
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Marine Weather and Tides
East Palo Alto, CA

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:14AMSunset 4:53PM Sunday December 15, 2019 11:05 AM PST (19:05 UTC) Moonrise 8:39PMMoonset 10:25AM Illumination 83% Phase: Waning Gibbous; Moon at 19 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 824 Am Pst Sun Dec 15 2019
.small craft advisory in effect until 9 am pst this morning...
Today..NW winds 10 to 15 kt. Gusts up to 25 kt this morning.
Tonight..N winds 5 to 15 kt.
Mon..NE winds up to 10 kt.
Mon night..E winds 5 to 15 kt.
Tue..E winds 5 to 10 kt.
Tue night..SE winds 5 to 15 kt. A chance of rain.
Wed..E winds around 5 kt. A chance of rain.
Thu..S winds around 5 kt. A chance of rain.
PZZ500 824 Am Pst Sun Dec 15 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds will be breezy today as a coastal trough develops over southern california while high pressure builds offshore. Moderate to large northwest swell will gradually subside into early next week. The combination of gusty winds and large combined seas will create hazardous seas conditions through this evening, particularly for smaller vessels. Southerly winds will return later on Monday ahead of the next weather system.


7 Day Forecast for Marine Location Near East Palo Alto, CA
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location: 37.45, -122.1     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 151725 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 925 AM PST Sun Dec 15 2019

SYNOPSIS. A few isolated showers linger off the coast during the early morning but are forecast to dissipate later in the day. The early part of the week provides cooler, drier conditions. Unsettled conditions return by midweek and potentially again late next weekend.

DISCUSSION. as of 08:27 AM PST Sunday . Spotty showers continue this morning just off the coast over the Pacific. As the upper level trough has moved east of the Bay Area driving drier, north- northwesterly flow, the chances for precipitation are low. Moisture lingers allowing for some clouds to linger today, but the colder air from the north will limit heating and provides widespread 50s across the region. Limited cloud cover added to cold air advection will allow for temperatures to cooler overnight. Most areas in the region should be in the low-40s, but isolated locations in the North Bay Valleys, East Bay Valleys and Southern Interior Monterey County will drop just above freezing in the mid- 30s.

The lower morning temperatures will bottom out on Monday morning and a slight warming trend will take place as high pressure grows while an upper level ridge builds to our west. The next upper level trough moves in by midweek. The forecast remains on track thus far as models are showing the next chance for light to moderate rainfall around the Bay Area and the Central Coast by Tuesday night into Wednesday. The trough-ridge-trough pattern continues allowing high pressure and another ridge to build by the end of the work week while temperatures remain seasonable. In the not too distant future, models are hinting at another system on Saturday night that could bring rain to the region.

PREV DISCUSSION. as of 03:23 AM PST Sunday . Lingering moisture in a northwest flow continues to result in isolated showers near coastal areas early this morning. Meanwhile, cold air advection has resulted in a region-wide cool down in wake of the passing of the main mid/upper level trough. As flow aloft turns more northerly through sunrise, look for showers to diminish in coverage with partly cloudy to mostly clear sky conditions developing through the day. Daytime temperatures will generally warm into the 50s for most urban areas and hold in the 40s in the higher elevations across the region.

Low level conditions will dry out even more so tonight into Monday resulting in even colder overnight conditions. With light winds and mainly clear sky conditions, temperatures will drop into the lower/middle 30s for most interior locations and into the upper 30s to lower 40s even near the coast by Monday morning. These will be some of the coldest temperatures of the month so far. Patchy frost will be possible with a few hours of freezing temperatures in the region's coldest interior locations. Other than an increase in high level clouds beginning Monday night into Tuesday, similar weather conditions are likely with highs in the 50s and lows in the 30s to 40s.

The forecast models continue to indicate an increase in moisture associated with a mid/upper level system approaching the region late Tuesday into Wednesday. This system has the potential to produce widespread rainfall, generally light to moderate in nature across portions of the region. However, there remains some uncertainty with respect to the exact track of this system, available moisture and mid/upper level support. Regardless, unsettled conditions are likely to return to much of the region by midweek. As that mid/upper level system shifts inland late in the week, a deeper plume of atmospheric moisture is forecast to take aim at the Pacific Northwest and/or far northern California with mainly dry conditions across our region. However, depending on the exact track of the deeper moisture advection, cannot rule out light rain over the far northern portions of the North Bay late in the week.

Unsettled weather conditions are then looking likely by late next weekend as a mid/upper level system approaches the region and pushes the deeper moisture plume southward in the form of a frontal system. Details remain difficult to nail down at this time, yet widespread rainfall looks possible Stay tuned.

AVIATION. as of 9:25 AM PST Sunday . For 18Z TAFs. VFR conditions are expected today. Some low level moisture remains with mainly FEW/SCT cumulus with bases 3000-5000 feet. Late this morning and afternoon cumulus will likely become more numerous over the terrain as the surface warms. Northwest winds have generally subsided since yesterday. Northwest winds mainly 5-10 kt today.

Vicinity of KSFO . VFR. Winds increasing to 10-15 kt this afternoon.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR through the period. W to NW winds 5-10 kt expected through the day today.

MARINE. as of 08:27 AM PST Sunday . Northwest winds will be breezy today as a coastal trough develops over southern California while high pressure builds offshore. Moderate to large northwest swell will gradually subside into early next week. The combination of gusty winds and large combined seas will create hazardous seas conditions through this evening, particularly for smaller vessels. Southerly winds will return later on Monday ahead of the next weather system.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Reyes to Pigeon Pt 0-10 nm SCA . Pigeon Pt to Pt Pinos 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . Mry Bay



PUBLIC FORECAST: RGass/DK AVIATION: Sims MARINE: Sims

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 7 mi48 min NW 8 G 9.9 53°F 57°F1024.6 hPa
AAMC1 - 9414750 - Alameda, CA 25 mi48 min 55°F
LNDC1 26 mi48 min NNW 4.1 G 5.1 52°F 1024.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 27 mi60 min NNW 8 G 11
OBXC1 28 mi54 min 52°F 42°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 28 mi60 min NNW 7 G 9.9 51°F 1024.1 hPa
PXSC1 29 mi48 min 54°F 43°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 29 mi48 min WNW 4.1 G 7 53°F 1023.3 hPa
FTPC1 - 9414290 - San Francisco, CA 31 mi60 min W 6 G 9.9 53°F 55°F1024.2 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 34 mi48 min NNW 7 G 9.9 52°F 1024.5 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 36 mi37 min NNW 13 53°F 1024 hPa
46237 - San Francisco Bar, CA (142) 37 mi36 min 55°F7 ft
RCMC1 - 9414863 - Richmond, CA 37 mi48 min 55°F
MZXC1 - 9415102 - Martinez-Amorco CA 40 mi60 min WNW 9.9 G 12 49°F 53°F1023.9 hPa
UPBC1 41 mi48 min WNW 8.9 G 12
PCOC1 - 9415144 - Port Chicago, CA 42 mi48 min W 6 G 8 50°F 53°F1023.7 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 42 mi48 min WNW 9.9 G 12 51°F 1023.7 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 42 mi26 min NNW 16 G 19 54°F 57°F1025.1 hPa47°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 43 mi48 min NW 7 G 8 51°F 1024 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 44 mi26 min NNW 9.7 G 14 53°F 56°F1025.2 hPa
ELXC1 - Elkhorn Slough Reserve, CA 48 mi81 min NNE 1 53°F 1025 hPa44°F
46092 - MBM1 48 mi59 min N 9.7 53°F 57°F1023.6 hPa (+2.6)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 49 mi36 min NNW 16 G 19 54°F 57°F1024.6 hPa46°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Palo Alto Airport, CA2 mi79 minN 010.00 miA Few Clouds52°F42°F72%1024.4 hPa
San Carlos Airport, CA10 mi78 minNW 710.00 miClear54°F41°F63%1024 hPa
San Jose, San Jose International Airport, CA11 mi73 minN 010.00 miA Few Clouds52°F42°F69%1024 hPa
Hayward, Hayward Air Terminal, CA15 mi72 minSSW 310.00 miFair52°F42°F69%1024.9 hPa
Oakland, Metro Oakland International Airport, CA18 mi73 minVar 310.00 miA Few Clouds53°F42°F66%1024.2 hPa
San Francisco, San Francisco International Airport, CA18 mi70 minW 1310.00 miA Few Clouds55°F39°F57%1023.8 hPa
Half Moon Bay Airport, CA22 mi71 minNW 1110.00 miFair54°F42°F67%1024.4 hPa
Livermore, Livermore Municipal Airport, CA23 mi73 minWSW 510.00 miFair49°F41°F74%1023.3 hPa

Link to 5 minute data for KPAO

Wind History from PAO (wind in knots)
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W12W7W6NW8--W6------------------SW5----Calm
1 day agoNW6--N5CalmSE9CalmCalmCalm4SW8SW6------------------444W9
2 days ago----5N7N7--NW63--CalmCalm------------------CalmCalmSE63

Tide / Current Tables for Palo Alto Yacht Harbor, California
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Palo Alto Yacht Harbor
Click for Map
Sun -- 03:26 AM PST     7.29 feet High Tide
Sun -- 07:15 AM PST     Sunrise
Sun -- 09:45 AM PST     3.77 feet Low Tide
Sun -- 10:24 AM PST     Moonset
Sun -- 02:50 PM PST     8.77 feet High Tide
Sun -- 04:51 PM PST     Sunset
Sun -- 08:39 PM PST     Moonrise
Sun -- 10:08 PM PST     -0.50 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.44.66.37.27.26.55.754.43.93.84.35.57.18.48.886.34.32.41-0-0.5-0.2

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
Click for Map
Sun -- 12:11 AM PST     1.52 knots Max Flood
Sun -- 03:51 AM PST     -0.01 knots Slack
Sun -- 07:15 AM PST     Sunrise
Sun -- 07:24 AM PST     -0.66 knots Max Ebb
Sun -- 09:12 AM PST     0.00 knots Slack
Sun -- 10:24 AM PST     Moonset
Sun -- 11:50 AM PST     0.90 knots Max Flood
Sun -- 02:27 PM PST     -0.00 knots Slack
Sun -- 04:51 PM PST     Sunset
Sun -- 07:32 PM PST     -1.47 knots Max Ebb
Sun -- 08:39 PM PST     Moonrise
Sun -- 10:11 PM PST     0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.41.10.6-0.1-0.3-0.5-0.6-0.5-0.10.30.80.90.70.2-0.2-0.5-0.9-1.2-1.4-1.4-0.8-0.10.6

Weather Map
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wmap_P
GEOS Local Image of CentralWestCoast    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 San Francisco/Monterey Bay Area, CA (14,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, CA
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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 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.