Wednesday, September30, 2020
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Marine Weather and Tides
Pescadero, CA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:01AMSunset 6:55PM Tuesday September 29, 2020 9:16 PM PDT (04:16 UTC) Moonrise 5:24PMMoonset 3:51AM Illumination 96% Phase: Waxing Gibbous; Moon at 13 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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PZZ560 Coastal Waters From Pigeon Point To Point Pinos California Out To 10 Nm- 830 Pm Pdt Tue Sep 29 2020
Tonight..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 4 to 6 ft at 14 seconds and sw 2 to 3 ft at 18 seconds. Patchy dense fog this evening.
Wed..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 3 to 5 ft at 13 seconds and sw 2 to 3 ft at 18 seconds.
Wed night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 3 to 4 ft at 12 seconds and sw 2 to 3 ft at 16 seconds.
Thu..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 1 to 2 ft. NW swell 3 to 5 ft at 18 seconds and sw 2 to 3 ft at 16 seconds.
Thu night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 5 to 7 ft at 16 seconds and sw around 2 ft at 15 seconds.
Fri..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 1 to 2 ft.
Fri night..NW winds 5 to 15 kt. Wind waves 1 to 2 ft.
Sat..NW winds 5 to 15 kt. Wind waves 1 to 2 ft.
Sun..NW winds up to 10 kt. Wind waves 1 ft.
PZZ500 830 Pm Pdt Tue Sep 29 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds have already begun to turn northwesterly over the southern waters, with the northern waters pivoting to the northwest on Wednesday. Winds are expected to increase slightly on Wednesday afternoon purducing some strong gusts in traditional coastal locations. Gusty winds along the coast can be expected through the end of the week. Seas will mainly be a mix of moderate northwest swell and a longer period, light southerly swell.


7 Day Forecast for Marine Location Near Pescadero, CA
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location: 37.18, -122.39     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 300404 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 904 PM PDT Tue Sep 29 2020

SYNOPSIS. Very warm to hot temperatures continuing across inland areas through much of the work week. Heat Advisories are up for the Bay Shoreline and much of the interior on Thursday. Expecting cooling trend, especially inland, over the weekend. Fire Weather Watches have been posted for the Glass and Dolan Fires.

DISCUSSION. as of 9:04 PM PDT Tuesday . Fire Weather Watches have been posted for the Dolan and Glass Fires. See Fire Weather section below for details. No other short term changes to the ongoing heat headlines.

PREV DISCUSSION. as of 02:30 PM PDT Tuesday . Water Vapor and Satellite Imagery currently capture the fog and low/stratus associated with the southerly surge pushing well north of Point Reyes as it continues its trek northward along the coast and into Oregon. Its effects have resulted in the CWA coast (including most of the Bay Shoreline) experiencing much cooler temperatures today compared to the interior, where temps are expected to remain above seasonal average until the upper-level ridge begins to break apart sometime this weekend. In terms of air quality, onshore flow and the gradual wind shift across the interior has helped to advect most of the smoke away from the Bay Area and across the northernmost portions of the North Bay. HRRRx smoke keeps most of the smoke in that area through early tomorrow morning although some elevated smoke may loop its way back down into Contra Costa county tomorrow morning. For the latest on smoke concentrations in your area, please refer to AirNow.

As the upper-level ridge continues to settle further south over the Great Basin, short and medium-range guidance suggesting that the culmination of 591dm 500hPa heights within our CWA and the thermal trough to once again bring temperatures up along the Bay Shoreline (including SF) by Thursday. Expecting the southeast side and the higher-terrain locations of the City to get up to 90F on Thursday, while the Bay Shoreline will also predominantly hover around the 90s. Even across the interior, expecting temps to get close to near-record breaking temps. Both San Jose and Livermore are progged to reach their respective daily record highs that day, while in the North Bay are expected to see locations like San Rafael get into the low 100s. As such, Heat Advisory is out for most of the CWA interior and Bay Shoreline (excluding the Pacific side) for Thursday. Locations in Southern Salinas Valley are also expected to get up to Heat Advisory criteria by as early as Wednesday, so have them under one for most of Wednesday along with the Thursday advisory.

Moreover, the position of the ridge through Wednesday and Thursday will unfortunately result in the continuation of RH values in the teens across the North Bay, but not expecting conditions as windy as what we have observed in recent days. Nevertheless, still expecting those areas including the ones affected by the Glass Fire to be relatively warm although some cooling is to be expected for those places that are downwind of the smoke plume. See fire weather section for more details. It should be noted that local- WRF and NAM are progging RH values in the mid-to-upper teens along with breezy, offshore signature over southern Monterey County Wednesday through Thursday night owing to anticyclonic flow mixing down near the surface. Plenty of fuel in the area as well, so will keep an eye on it and provide an update later this evening.

As the upper-level ridge breaks apart this weekend, lower mid- level heights will translate into much welcomed temperature relief across the interior, with temps in the 80s currently progged across places like San Jose and even Livermore. Still a lot of uncertainty over the tropical remnants next week, with the GEFS members taking on more robust signatures while the ECMWF ENS placing us over the divergent quadrant of the mid-level trough. Should enough moisture move in, have the potential for some precip associated with this moisture return. Keep in mind this setup is still over a week out, so low confidence for now. Will be monitoring it closely in the coming days.

AVIATION. as of 04:45 PM PDT Tuesday . For the 00z TAFs. Mostly VFR as stratus starts to creep through the Golden Gate and over the Monterey Peninsula. The marine layer is at about 1,200 feet. Smoke and haze will linger over much of the region with the greatest impacts likely over the North Bay terminals which are closer to the ongoing wildfires. As winds subside overnight, MVFR/IFR conditions are forecast as stratus moves father inland with the deepening marine layer. Clearing expected after 17z, with VFR forecast Wednesday afternoon. Winds shift to the northwest providing stronger onshore winds.

Vicinity of KSFO . Winds remain onshore around 20 knots at this hour and will slowly subside overnight. Visibility is forecast to remain above 6SM, but smoke aloft may result in slant range issues through the night. VFR conditions currently before stratus moves into the bay later tonight. Stratus is expected to develop over the terminal after 11Z Wednesday before clearing after 16Z. VFR forecast Wednesday afternoon with stronger northwest winds.

SFO Bridge Approach . Possible slant-range vis issues with smoke and haze. Otherwise, similar to KSFO.

Monterey Bay Terminals . Stratus clouds are moving around KMRY and beginning to descend into the Salinas Valley. The marine layer will deepen overnight with IFR/LIFR conditions expected at area terminals Wednesday morning. Late clearing as the clouds peel back to the ocean. Winds become calm tonight before onshore and breezy Wednesday afternoon.

CLIMATE. Here are record high temperatures for Wednesday and Thursday .

. WEDNESDAY THURSDAY FRIDAY SANTA ROSA . 102 in 1980 . 102 in 1980 . 105 in 1980 KENTFIELD . 95 in 1966 . 97 in 2012 . 100 in 2012 NAPA . 100 in 1980 . 106 in 1980 . 102 in 1980 RICHMOND . 96 in 2001 . 99 in 1980 . 100 in 1980 LIVERMORE . 100 in 2012 . 102 in 1952 . 106 in 1980 SAN FRANCISCO . 96 in 2001 . 97 in 1980 . 96 in 1980 SF AIRPORT . 94 in 2001 . 97 in 1980 . 96 in 1980 REDWOOD CITY . 95 in 2001 . 103 in 1980 . 104 in 1980 HALF MOON BAY . 92 in 2001 . 83 in 2014 . 88 in 1995 OAKLAND DOWNTOWN . 98 in 1980 . 103 in 1980 . 103 in 1980 SAN JOSE . 94 in 2001 . 97 in 1980 . 96 in 2012 GILROY . 98 in 2010 . 104 in 2001 . 107 in 1980 SANTA CRUZ . 98 in 1978 . 102 in 1965 . 102 in 1980 SALINAS . 99 in 2001 . 105 in 1980 . 103 in 1980 KING CITY . 105 in 1980 . 109 in 1980 . 107 in 1980

FIRE WEATHER. as of 9:04 PM PDT Tuesday . Atypical 595 dm ridge of high pressure is going to bring continued hot and dry weather. For at least the last 24 hours the models have been hinting at some more adverse fire weather condtions that will coincide with the hot temps. Have coordinated with onsite incident meteorologists and issued Fire Weather Watches for the Dolan and Glass Fires.

Glass Fire: Fire Weather Watch 1 pm Thursday through Friday 6 pm. Weather has moderated today with cooler temps, higher humidity and lighter winds. Yet the fire remains active near Calistoga. Conditions shouldnt change too much for Weds. By midday Thursday models bring some increasing Northwest (onshore) winds but with lowering humidity values. Northwest winds to increase by Thursday evening with gusts 25-30 mph out of the northwest which would be the first time the Glass Fire feels the effects of gusty northwest winds. Any open or unsecured line in the East Zone would be adversely impacted as well as lingering heat near the zone break and Div KK. Conditions to remain hot, dry and breezy through Friday with persistent WNW winds with highs still in the 90s. Finally some cooling this weekend.

Dolan Fire: Fire Weather Watch 6 pm Weds through 6 pm Friday. Heat seen on satellite today was mostly interior burning. As early as Weds 6 pm 925 mb winds to 20 mph over the Dolan Fire. Thus Watch starts for Weds night for ridge top winds 10-20 gusts 25-30 mph. Strongest winds above 2000 feet with little or no nighttime humidity recovery. Winds may ease at times but models showing a prolonged breezy wind event lasting Thursday and Friday. It wont mix down to lower elevations but should impact most areas of the Dolan Fire with 1-2 days of northeast winds and very low humidity, dropping into the single digits at night. This will definitely be a wind test for containment lines as well as indirect lines. Some signs of cooling by this weekend as the marine layer deepens.

MARINE. as of 08:32 PM PDT Tuesday . Winds have already begun to turn northwesterly over the southern waters, with the northern waters pivoting to the northwest on Wednesday. Winds are expected to increase slightly on Wednesday afternoon purducing some strong gusts in traditional coastal locations. Gusty winds along the coast can be expected through the end of the week. Seas will mainly be a mix of moderate northwest swell and a longer period, light southerly swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. NONE.



PUBLIC FORECAST: RWW/Diaz/DRP AVIATION: DK MARINE: DK FIRE WEATHER: RWW

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 24 mi46 min NNW 7 G 8 63°F 74°F1017.5 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 27 mi36 min NW 5.8 G 7.8 59°F 58°F1017.2 hPa59°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 29 mi36 min NW 5.8 G 7.8 59°F 1017.7 hPa58°F
46114 - West Monterey Bay, CA 33 mi50 min 57°F7 ft
46092 - MBM1 35 mi67 min NNW 3.9 57°F 57°F1016.4 hPa (+0.3)
MLSC1 - Moss Landing, South Harbor, CA 41 mi45 min W 4.1 G 8.9 58°F 1012.4 hPa58°F
AAMC1 - 9414750 - Alameda, CA 41 mi46 min W 7 G 8 60°F 69°F1017.2 hPa
PXSC1 43 mi46 min 60°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 43 mi46 min WSW 4.1 G 9.9 59°F 1015.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 43 mi46 min SW 8 G 9.9
OBXC1 43 mi46 min 60°F 60°F
LNDC1 43 mi46 min WSW 5.1 G 7 62°F 1017 hPa
FTPC1 - 9414290 - San Francisco, CA 43 mi46 min WSW 2.9 G 8 58°F 63°F1017.3 hPa
ELXC1 - Elkhorn Slough Reserve, CA 43 mi91 min NW 1.9 58°F 58°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 44 mi46 min WSW 2.9 G 7 60°F 1017 hPa
46237 - San Francisco Bar, CA (142) 44 mi46 min 59°F5 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 46 mi36 min WNW 5.8 G 7.8 57°F1017.8 hPa
46240 - Cabrillo Point, Monterey Bay, CA (158) 46 mi50 min 57°F3 ft
MEYC1 48 mi40 min NNW 2.9 G 4.1 57°F 63°F1017.4 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 49 mi35 min Calm 62°F 1017 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA24 mi21 minNNW 71.50 miFog/Mist59°F57°F94%1017.9 hPa

Link to 5 minute data for KHAF

Wind History from HAF (wind in knots)
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Last 24hrS7SE7S6SE7S3CalmCalmSE3S6SE5SE3E5S4SW5--SW5S3S4W5SW5W5NW5NW5N6
1 day agoNW9NW4SE7SE4SE3SE5CalmCalmS3CalmCalmSE3S5S7S5S6S7S7S6S5S6SE7SE6SE7
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Tide / Current Tables for Ano Nuevo Island, California
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Ano Nuevo Island
Click for Map
Wed -- 04:08 AM PDT     0.41 feet Low Tide
Wed -- 05:49 AM PDT     Moonset
Wed -- 07:04 AM PDT     Sunrise
Wed -- 10:34 AM PDT     4.74 feet High Tide
Wed -- 04:30 PM PDT     1.34 feet Low Tide
Wed -- 06:49 PM PDT     Moonrise
Wed -- 06:53 PM PDT     Sunset
Wed -- 10:22 PM PDT     4.78 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.62.51.50.70.40.61.22.23.24.14.64.74.33.52.61.81.41.41.92.63.54.34.74.7

Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
Click for Map
Wed -- 04:22 AM PDT     0.51 feet Low Tide
Wed -- 05:50 AM PDT     Moonset
Wed -- 07:05 AM PDT     Sunrise
Wed -- 10:52 AM PDT     5.14 feet High Tide
Wed -- 04:44 PM PDT     1.44 feet Low Tide
Wed -- 06:50 PM PDT     Moonrise
Wed -- 06:53 PM PDT     Sunset
Wed -- 10:40 PM PDT     5.18 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.23.11.910.50.61.22.13.24.24.95.14.8432.11.61.51.82.63.54.455.2

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
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.