Wednesday, August12, 2020
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Marine Weather and Tides
Broadmoor, CA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 6:22AMSunset 8:07PM Wednesday August 12, 2020 5:26 PM PDT (00:26 UTC) Moonrise 12:00AMMoonset 1:54PM Illumination 34% Phase: Waning Crescent; Moon at 24 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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PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 232 Pm Pdt Wed Aug 12 2020
This afternoon..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 3 to 5 ft at 11 seconds and S around 2 ft at 15 seconds.
Tonight..W winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 3 to 5 ft at 10 seconds and S around 2 ft at 14 seconds.
Thu..NW winds 5 to 15 kt. Wind waves 1 ft. NW swell 3 to 5 ft at 10 seconds and S around 2 ft at 13 seconds.
Thu night..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 3 to 5 ft at 9 seconds and S around 2 ft at 13 seconds.
Fri..NW winds 5 to 10 kt. Wind waves 1 ft. NW swell 3 to 5 ft at 9 seconds and S around 2 ft at 16 seconds. A slight chance of showers and Thunderstorms.
Fri night..NW winds 5 to 15 kt. Wind waves 1 ft. Mixed swell nw 2 to 4 ft at 8 seconds and S around 2 ft at 15 seconds.
Sat..W winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 2 to 4 ft.
Sun..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 2 to 3 ft. Winds and wind waves higher in and near Thunderstorms.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 4 to 6 ft with dominant swell period of 11 seconds. Across the bar...seas 5 to 7 ft with dominate swell period of 11 seconds. Maximum ebb current of 1.9 kt at 12:01 am Thursday and 0.8 kt at 01:07 pm Thursday.
PZZ500 232 Pm Pdt Wed Aug 12 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Strengthening northwest winds across the waters, especially north of point reyes where hazardous conditions for small craft exist as a result of the winds and seas. In addition, locally gusty onshore winds of up to around 25kt are expected on the south and east sides of angel island in the northern san francisco bay this afternoon. Northwest winds decrease later in the week. Seas will remain mixed with a short period northwest swell and a longer period southerly swell.


7 Day Forecast for Marine Location Near Broadmoor, CA
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location: 37.74, -122.59     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 130008 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 508 PM PDT Wed Aug 12 2020

SYNOPSIS. A warming trend will continue through late week as high pressure builds toward the coast. Some tropical moisture arriving from the south will bring a chance for a few showers and thunderstorms Thursday and Friday. By Friday and moreso over the weekend hot weather returns to inland areas with triple digit heat likely continuing into early next week while a shallow marine layer persists along the coast.

DISCUSSION. as of 2:00 PM PDT Wednesday . Fort Ord Profiler put the depth of the marine layer this afternoon around 1500 ft, with most of the low stratus hugging the coast. Of interesting note, a notable temperature gradient is evident across San Francisco County, with the west side of the county running 5-7 degrees cooler than than east side of the county, owing to the low stratus deck which has been sitting over the west side of the county all day.

The axis of the longwave trough is currently over BC, with the PAC NW on the divergent side. To our south, a shortwave trough is expected to continue moving towards our CWA. Tropical storm Elida is due west of Baja and gradually weakening as it moves to the northwest. Expecting its remnants to be absorbed by the shortwave and advected northward into our CWA Thursday through Friday. Model guidance is currently suggesting that the tropical moisture will move into our southern CWA sometime around late Thursday morning. Theta-e tongue can be observed on the NAM-12km runs for today, while Total Totals >30 are apparent on both the GFS and ECMWF runs over southern Monterey County and fairly close to the Delta. Not expecting widespread thunderstorms and showers, nor is there a significant probability for them Thursday and Friday. Nevertheless, should any convection develop, expect the most likely areas for their development to be down in Southern Monterey/San Benito counties on Thursday. Moreover, PWAT values on both the GFS and ECMWF runs today stay relatively over an inch across that area, suggesting that if any convection does develop then we should expect for it to be wet convection. Nevertheless, going to have to keep an eye for lightning. Theta-e values increase through Friday across the central part of the CWA as the tropical moisture continues tracking northward. As such, the slight chance for possible showers and thunderstorms will move north and westward on Friday. NAM- 12km runs have kept most of that risk offshore, however, so currently keeping inland chances fairly low.

Friday onwards, expecting the warm up across the region to really get going as the high over the Desert Southwest continues to build. Models suggesting heights >590dm 500hPa across most of our eastern CWA, while 850hPa temps are expected to be in the upper 20 C range. Models have continued to trend towards this setup, and if it continues to trend this way, then high confidence will exist for widespread 90s and low 100s to be expected across the interior this weekend, with some isolated locations like Pinnacles and Lake Berryessa potentially getting into the 100 to 108 degree range. Not much in the way of relief is expected through the weekend, with poor humidity recoveries and hot conditions to influence most of our CWA. Sharp temp gradients are expected between the coast and areas just a few miles inland this weekend as a result. Even along the coast, expect weekend max temps in the mid-70s and even the low 80s. All that being said and after coordinating with neighboring offices will maintain an Excessive Heat Watch beginning Friday afternoon continuing through Sunday evening for interior East Bay, Santa Clara Valley (recently added), and Southern interior of Monterey/San Benito.

AVIATION. as of 5:08 PM PDT Wednesday . for 00z TAFs. Marine layer has compressed to just over 1000 feet. This will keep low clouds out of SF Bay for this evening but shallow cigs will move into Monterey Bay terminals before sunset. Given the shallow marine layer, northerly gradient and lighter onshore winds will not be expecting stratus to be as widespread Thursday morning. Should be an early mix out for any terminals that get cigs due to shallow nature. Will be expecting increasing mid and high clouds during the day Thursday, impacting the Central Coast first and then spreading northward later into Thursday evening.

Vicinity of KSFO . VFR this evening with no cigs forecast overnight. Any patchy clouds Thursday morning should mix out by 16z with some increasing high clouds by afternoon. Light afternoon seabreeze on Thursday.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Low cigs to impact KSNS shortly and then KMRY overnight. Shallow cloud deck should mix out by 16z Thursday.

MARINE. as of 3:00 PM PDT Wednesday . Strengthening northwest winds across the waters, especially north of Point Reyes where hazardous conditions for small craft exist as a result of the winds and seas. In addition, locally gusty onshore winds of up to around 25kt are expected on the south and east sides of Angel Island in the Northern San Francisco Bay this afternoon. Northwest winds decrease later in the week. Seas will remain mixed with a short period northwest swell and a longer period southerly swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Arena to Pt Reyes 0-10 nm until 3 AM SCA . SF Bay until 9 PM



PUBLIC FORECAST: RGass AVIATION: RWW MARINE: DRP

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 4 mi57 min 61°F4 ft
FTPC1 - 9414290 - San Francisco, CA 8 mi57 min W 8.9 G 18 57°F 64°F1012.7 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 11 mi57 min WSW 7 G 12 64°F 1011.3 hPa
PXSC1 11 mi57 min 65°F 58°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 13 mi37 min WNW 9.7 G 12 54°F 58°F4 ft1013.5 hPa54°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 14 mi57 min NW 8.9 G 11 61°F 1012.3 hPa
OBXC1 14 mi57 min 64°F 59°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 14 mi57 min W 7 G 9.9
AAMC1 - 9414750 - Alameda, CA 16 mi57 min W 9.9 G 11 66°F 70°F1012.5 hPa
RCMC1 - 9414863 - Richmond, CA 16 mi57 min SSE 1.9 G 6 70°F 67°F1011.7 hPa
LNDC1 17 mi57 min NW 6 G 8.9 67°F 1012.3 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 17 mi57 min SSW 8 G 12 64°F 1012.4 hPa
RTYC1 - 9414523 - Redwood City, CA 26 mi57 min NNW 12 G 14 70°F 76°F1012.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 28 mi57 min WSW 8 G 11 75°F 1010.9 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 31 mi47 min NNW 12 G 16 57°F 1013.7 hPa55°F
MZXC1 - 9415102 - Martinez-Amorco CA 32 mi57 min WNW 15 G 16 81°F 72°F1010.7 hPa
UPBC1 32 mi57 min WNW 9.9 G 16
PCOC1 - 9415144 - Port Chicago, CA 36 mi57 min W 16 G 17 82°F 72°F1010.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 43 mi57 min NW 12 G 15 83°F 1010.1 hPa
SFXC1 - San Francisco Bay Reserve, CA 44 mi102 min WNW 8.9
46214 - Point Reyes, CA (029) 48 mi61 min 62°F6 ft

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA15 mi31 minWNW 2010.00 miA Few Clouds and Breezy67°F55°F66%1011.5 hPa
Half Moon Bay Airport, CA17 mi32 minNW 89.00 miOvercast59°F55°F88%1013.5 hPa
Oakland, Metro Oakland International Airport, CA20 mi34 minNW 1210.00 miA Few Clouds73°F55°F55%1012 hPa
San Carlos Airport, CA23 mi89 minN 910.00 miClear75°F59°F57%1012.2 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrNW17NW12W16W13W11NW9NW7NW7W6NW7W6W7W3NW5NW5NW7N10N5N8NW12NW14NW17NW18NW20
1 day agoNW12NW13NW14NW12NW10NW9NW7NW8NW9NW7NW3NW5SW4S3NW3CalmE4NE7NE7NW14
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2 days agoNW15NW17NW15NW13NW11W8NW5W6W8NW10NW9NW8W5NW5CalmN4N3NE8N7NW11NW13NW15NW15NW15

Tide / Current Tables for San Francisco Bar, California
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San Francisco Bar
Click for Map
Wed -- 12:30 AM PDT     1.42 feet Low Tide
Wed -- 12:32 AM PDT     Moonrise
Wed -- 06:24 AM PDT     Sunrise
Wed -- 07:15 AM PDT     3.46 feet High Tide
Wed -- 11:45 AM PDT     2.84 feet Low Tide
Wed -- 02:54 PM PDT     Moonset
Wed -- 06:08 PM PDT     5.30 feet High Tide
Wed -- 08:06 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.51.72.12.633.33.53.43.33.12.92.833.444.65.15.35.24.73.92.92

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Wed -- 12:32 AM PDT     Moonrise
Wed -- 01:44 AM PDT     0.00 knots Slack
Wed -- 04:31 AM PDT     0.71 knots Max Flood
Wed -- 06:23 AM PDT     Sunrise
Wed -- 08:10 AM PDT     -0.00 knots Slack
Wed -- 10:07 AM PDT     -0.57 knots Max Ebb
Wed -- 01:08 PM PDT     0.00 knots Slack
Wed -- 02:54 PM PDT     Moonset
Wed -- 04:11 PM PDT     0.65 knots Max Flood
Wed -- 07:30 PM PDT     -0.00 knots Slack
Wed -- 08:05 PM PDT     Sunset
Wed -- 10:39 PM PDT     -1.26 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.7-0.30.10.50.70.70.60.40.1-0.4-0.6-0.5-0.2-00.20.50.60.60.40.2-0.2-0.8-1.2-1.2

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 (20,4,5,8)
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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 numerous 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.