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Marine Weather and Tides Colma, CA Version 3.4

NOTICE 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

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Sunrise 6:04AM

Sunset 8:27PM

Tuesday July 23, 2019 6:16 AM PDT (13:16 UTC)

Moonrise 11:23PM

Moonset 11:19AM

Illumination 61%

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.

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7 Day Forecast for Marine Location Near Colma, CA

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Area Discussion for - San Francisco/Monterey Bay Area, CA

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Fxus66 kmtr 231144 afdmtr area forecast discussion national weather service san francisco bay area 444 am pdt Tue jul 23 2019 Synopsis Inland temperatures will warm to above seasonal averages through the remainder of the week and into the upcoming weekend as high pressure dominates the weather pattern. The influence of a shallow marine layer and persistent onshore flow will keep conditions seasonably mild near the coast. Discussion As of 02:51 am pdt Tuesday... A shallow marine layer at about 800 feet in depth has resulted in low clouds over much of the monterey bay southward into the salinas valley. In addition, patchy stratus can be see on goes-w satellite imagery along the san francisco peninsula as well as offshore. These clouds may fill in a bit through sunrise, yet will be less widespread compared to previous mornings. In addition, mid- level moisture rotating around the building mid upper level high pressure over the desert southwest appears to have produced an isolated high-based shower over far eastern portion of san benito county, now moving across western fresno and merced counties. Overall, expecting only a few sprinkles from this if any precipitation is reaching the surface at all. Regardless, look for mid high level clouds to continue to move over the interior portion of the central coast through the morning. The aforementioned mid upper level high pressure to our east will continue to be the dominate weather feature across the southwestern portion of the country through the remainder of the week. However, the ridge is forecast to be suppressed slightly over northern california today as an upper level trough just off of the british columbia coast pushes into the pacific northwest. This will stall the warming trend a bit today with some inland locations potentially cooling by a few degrees. Regardless, look for widespread 80s and 90s across the interior while upper 60s to middle 70s will be common near the coast. The warming trend will continue on Wednesday as the ridge strengthens over the region. Daytime temperatures will likely warm to around 10 degrees above seasonal averages over the interior. Meanwhile, a shallow marine layer and continued onshore flow will maintain cooler conditions near the coast with periods of night morning low clouds and patchy fog. Temperatures cool slightly across inland areas Thursday and Friday, but will remain very warm. Look for an increase in mid upper level clouds late in the week as

monsoon moisture advects across the region around the ridge over the desert southwest. With this, will need to monitor for any potential of high-based showers and or thunderstorms, mainly for Thursday night. Longer range guidance from both the ECMWF and gfs, as well as the ensembles, indicate the ridge of high pressure will shift westward and over southern california during the upcoming weekend. This will likely result in additional warming with daytime temperatures rebounding to above seasonal averages for much of the region. Thus, will need to monitor for increased heat risks across the interior by the weekend. Aviation As of 4:44 am pdt Tuesday... The marine layer remains compressed under large scale subsidence resulting in vlifr-ifr on the coastline and into the salinas valley.VFR is still reported at kmry, but tempo ifr remains in the forecast for a few hours until 16z this morning. Inland it'sVFR. Similar to yesterday the marine layer should scatter back to the coastline then return locally inland tonight and Wednesday morning. Vicinity of ksfo... Conditions remain favorable forVFR to prevail through the forecast period. Onshore wind increases by early afternoon with gusts up to 20 knots possibly a few higher gusts up to 25 knots. Sfo bridge approach... Similar to ksfo. Monterey bay terminals... Vlifr-ifr then clearing is anticipated around 17z this morning.VFR late morning into the afternoon then vlifr-ifr returning this evening. Marine As of 2:51 am pdt Tuesday... Breezy northwest winds will persist today across the coastal waters. Winds will increase becoming gusty tonight and Wednesday as high pressure builds into the pacific northwest and northern california. Light southerly swell coupled with short period wind waves will continue through the week. Mtr watches warnings advisories Tday Sca... Pigeon pt to pt pinos 0-10 nm from 9 am sca... Pt arena to pt reyes 0-10 nm sca... Pt arena to pigeon pt 10-60 nm sca... Pigeon pt to pt piedras blancas 10-60 nm sca... Pt pinos to pt piedras blancas 0-10 nm sca... Pt reyes to pigeon pt 0-10 nm sca... Mry bay from 9 am sca... Sf bay from 3 pm public forecast: rgass aviation marine: canepa visit us at

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
PXOC1 - 9414311 - San Francisco (Pier 1), CA	8 mi	46 min	W 5.1 G 7	57°F			1014.7 hPa
AAMC1 - 9414750 - Alameda, CA	9 mi	52 min	W 8 G 9.9	58°F	69°F		1016.3 hPa
FTPC1 - 9414290 - San Francisco, CA	9 mi	52 min	SSW 5.1 G 7	57°F	60°F		1016 hPa
OBXC1	10 mi	46 min		58°F				58°F
OKXC1 - 9414776 - Oakland (Berth 34), CA	10 mi	46 min	WSW 5.1 G 6	58°F			1015.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA	10 mi	46 min	WSW 8.9 G 9.9
LNDC1	11 mi	46 min	WSW 7 G 8.9	58°F			1015.8 hPa
46237 - San Francisco Bar, CA (142)	14 mi	46 min			59°F	4 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA	15 mi	29 min	Calm	57°F			1016 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA	16 mi	46 min	SSW 13 G 15	58°F			1015.8 hPa
RTYC1 - 9414523 - Redwood City, CA	16 mi	46 min	NNW 1.9 G 2.9	61°F	75°F		1016.3 hPa
RCMC1 - 9414863 - Richmond, CA	17 mi	52 min	S 8.9 G 12	58°F	64°F		1015.3 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA	23 mi	26 min	NW 12 G 16	55°F	56°F	4 ft	1016.8 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA	27 mi	46 min	WSW 11 G 14	60°F			1014.4 hPa
UPBC1	29 mi	46 min	WNW 9.9 G 16
MZXC1 - 9415102 - Martinez-Amorco CA	29 mi	46 min	WNW 14 G 16	61°F	69°F		1014.4 hPa
PCOC1 - 9415144 - Port Chicago, CA	33 mi	46 min	W 14 G 16	61°F	70°F		1014.5 hPa
PRYC1 - 9415020 - Point Reyes, CA	37 mi	46 min			60°F		1016 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA	38 mi	46 min	NW 12 G 17	65°F			1013.4 hPa
SFXC1 - San Francisco Bay Reserve, CA	42 mi	91 min	WNW 7	61°F			1014 hPa	55°F

Wind History for Alameda, CA

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W3 G6

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W10 G13

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W9 G14

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W6 G9

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
San Francisco, San Francisco International Airport, CA	5 mi	20 min	WNW 10	10.00 mi	A Few Clouds	59°F	53°F	81%	1015.7 hPa
Oakland, Metro Oakland International Airport, CA	11 mi	23 min	N 4	7.00 mi	A Few Clouds	58°F	53°F	84%	1015.9 hPa
Half Moon Bay Airport, CA	12 mi	21 min	NE 3	8.00 mi	Overcast	55°F	53°F	94%	1016.9 hPa
Hayward, Hayward Air Terminal, CA	16 mi	22 min	N 3	10.00 mi	Fair	59°F	53°F	81%	1016.6 hPa

Wind History from SFO (wind in knots)

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Tide / Current Tables for South San Francisco, San Francisco Bay, California

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Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current

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Weather Map and Satellite Images

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GOES 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

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Wind Forecast for San Francisco/Monterey Bay Area, CA (9,2,3,4)

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Ground Weather Radar Station San Francisco Bay Area, 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.