Thursday, October1, 2020
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Marine Weather and Tides
Los Gatos, 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 7:02AMSunset 6:51PM Thursday October 1, 2020 4:44 AM PDT (11:44 UTC) Moonrise 6:13PMMoonset 5:45AM Illumination 99% Phase: Full Moon; Moon at 14 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- 215 Am Pdt Thu Oct 1 2020
Today..NW winds 10 to 20 kt. Wind waves 1 to 2 ft. NW swell 2 to 4 ft at 16 seconds and sw 2 to 3 ft at 16 seconds.
Tonight..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 1 to 2 ft. W swell 3 to 5 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 2 to 3 ft. W swell 5 to 7 ft at 14 seconds and sw around 2 ft at 15 seconds.
Fri night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 3 to 5 ft at 13 seconds and sw around 2 ft at 15 seconds.
Sat..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 2 to 4 ft at 14 seconds and sw around 2 ft at 14 seconds.
Sat night..NW winds 15 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 4 to 5 ft at 14 seconds and S around 2 ft at 17 seconds.
Sun..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. Mixed swell W 3 to 5 ft and S 3 to 5 ft.
Mon..NW winds 5 to 10 kt. Wind waves 1 ft. Mixed swell nw 3 to 5 ft and S 4 to 5 ft.
PZZ500 215 Am Pdt Thu Oct 1 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light to moderate northwest winds will persist as high pressure remains over the eastern pacific. Locally breezy afternoon and evening conditions expected along the immediate coast and prominent points and headlands. The strongest winds are forecast along the big sur coast south of point sur. Mixed seas will continue with a moderate northwest swell and a longer period light southerly swell. Expect southerly swell to build from south to north at the end of the week and into the weekend as a result of hurricane marie.


7 Day Forecast for Marine Location Near Los Gatos, CA
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location: 37.24, -121.95     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 011133 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 433 AM PDT Thu Oct 1 2020

SYNOPSIS. Very warm to hot and dry conditions will persist over the region Thursday and Friday. This will result in an increase in Heat Risks across interior locations as well as critical fire weather conditions over the higher terrain, especially where ongoing fires continue. A region- wide cooling trend is then expected for this upcoming weekend.

DISCUSSION. as of 3:37 AM PDT Thursday . Only notable feature on the overnight satellite imagery are the heat signatures from ongoing fires across the state. Unlike the last few nights low clouds are non-existent for the forecast area. No clouds visible, but the marine layer is still present, but it's been crushed to a few hundred feet per the Fort Ord profiler.

Near term weather impacts to the Bay Area and Central California will continue to be focused on heat, smoke and fire weather. For specific fire weather details see the fire weather section below.

No overall change regarding current Heat Advisory products currently in effect for interior locations including San Francisco and the Bay Shoreline. The large scale synoptic pattern reveals an impressive upper level ridge covering the entire West, including a northward extent into E Alaska. After a toasty day yesterday today will be a tad warmer with a few near record to record high temperatures. The lower confidence part of the forecast continues to be the zone along the immediate coastline and a few miles inland, especially a challenging spot like downtown San Francisco. Hi-res models still show a weak onshore component, which will help to keep the coast from getting really hot. Regardless, interior areas will be hot. Highs today will be well into the 90s with many far interior spots reaching into to the low 100s. Stronger northerly flow is forecast to develop later today resulting in breezy to gusty conditions, especially the higher terrain. The winds will likely result in a few hot spot areas thanks to downsloping flow. These local hot spots will be downwind/lee side of an higher terrain. Not expecting a huge amount of relief tonight as overnight lows will remain mild and in the 60s and 70s, with a few local spots staying in the low 80s. A slight nudge downward with temperatures is expected on Friday, especially near the coast/bays, but interior spots will remain in the 90s to near 100. Heat Risk concerns begin to decrease on Friday, but may need to re-evaluate and see if interior locations need one more day of a Heat Advisory. Widespread cooling is expected over the weekend and next weak as the ridge breaks down and a trough approaches from the NW.

In addition to the heat, the airmass over the region is very dry and is on track to remain dry through at least Friday. The combination of very low relative humidity, hot temperatures, and increasing winds will result in critical fire weather conditions, especially over the higher terrain. Red Flag Warnings are in effect for most of the higher terrain with the exception of interior San Benito County, where winds won't be as strong.

Despite increasing winds, smoke will continue to be a problem around the region. Smoke isn't just from fires nearby, but fires north of the Bay Area. Overnight sensors indicate poor air quality and reduced visibility to a few miles thanks to smoke. The deteriorating fire weather conditions will likely result in more smoke production from ongoing fires like exacerbating the smoke issue. For more details regarding smoke check out the Bay Area AQ District and fire.airnow.gov.

The extended part of the forecast is still looking interesting given the potential for tropical moisture and precip to NorCal. Details on specific models have changed, but the general idea is still there. Leftover tropical moisture has the potential to interact with an approaching trough late next week with precip occurring over the PacNW and possibly southward into the Bay Area.

AVIATION. as of 04:33 AM PDT Thursday . For the 12z TAFs. A very shallow marine layer remains in place at below 500 ft AGL per the Fort Ord Profiler. Satellite imagery shows clear skies across the region aside from continued wildfire smoke across the North Bay. Generally VFR conditions to prevail as high pressure remains overhead. Reduced surface and slant range vis possible throughout the period due to smoke and haze. HRRR smoke forecast shows an increase in near surface smoke across the area today and tonight as northerly winds allow smoke to move back into the Bay Area. Observations still show winds aloft around 20 to 25 mph with relatively calm surface winds. Therefore, LLWS remains in some of the tafs. Additionally, models still suggest winds aloft increasing again this evening. Onshore winds this afternoon around 10-15 kt, locally stronger gusts in coastal areas possible.

Vicinity of KSFO . VFR conditions with occasionally FEW to SCT cigs due to wildfire smoke. Slant range vis concerns may continue due to smoke and haze as well as periodically reduced surface vis. Models still show winds aloft around 25 kt into early this afternoon with relatively calmer surface winds, therefore, kept LLWS in this morning's taf. Guidance also shows winds aloft increasing again this evening. Generally light winds at the surface before turning onshore this afternoon 15 to 20 kt.

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

Monterey Bay Terminals . VFR conditions to prevail with no clouds in sight per latest satellite imagery. Latest models and guidance keep VFR through the period with high pressure and dry conditions persisting. Light winds this morning turning onshore this afternoon.

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

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

FIRE WEATHER. as of 9:15 AM PDT Wednesday . Critical fire weather conditions are expected to develop over portions of the district Wednesday and Thursday due to hot, dry and breezy conditions.

A shallow marine layer developed overnight bringing much needed relief to lower elevations of the district. However, conditions above 1,000 feet still remain mild and dry this morning. Satellite imagery still shows some heat associated with the Glass Fire. Specifically the hills above the community of Calistoga.

The Fire Weather Watch has bee upgraded to a Red Flag Warning for the following areas:

Glass Fire: Red Flag Warning 1 pm Thursday through Friday 6 pm. Yet the fire remains active near Calistoga. Conditions shouldn't change too much for today. 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: Red Flag Warning 6 pm Weds through 6 pm Friday. 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 02:15 AM PDT Thursday . Light to moderate northwest winds will persist as high pressure remains over the eastern Pacific. Locally breezy afternoon and evening conditions expected along the immediate coast and prominent points and headlands. The strongest winds are forecast along the Big Sur Coast south of Point Sur. Mixed seas will continue with a moderate northwest swell and a longer period light southerly swell. Expect southerly swell to build from south to north at the end of the week and into the weekend as a result of Hurricane Marie.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. Heat Advisory . CAZ006-506>508-510>513-516>518-528 Red Flag Warning . CAZ517 Red Flag Warning . CAZ507-511-512 SCA . Pt Arena to Pt Reyes 0-10 nm from 11 AM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm from 11 AM



PUBLIC FORECAST: MM AVIATION: AS MARINE: AS FIRE WEATHER: MM/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 23 mi57 min W 1.9 G 1.9 68°F 74°F1015.8 hPa
ELXC1 - Elkhorn Slough Reserve, CA 31 mi120 min NE 1.9 58°F 58°F
46092 - MBM1 34 mi96 min NNE 5.8 58°F 58°F1014.8 hPa (-0.7)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 39 mi45 min NNW 7.8 G 9.7 58°F 57°F1015.3 hPa (-0.8)57°F
AAMC1 - 9414750 - Alameda, CA 41 mi57 min N 1.9 G 2.9 68°F 69°F1015.4 hPa
46240 - Cabrillo Point, Monterey Bay, CA (158) 42 mi49 min 57°F3 ft
LNDC1 42 mi57 min NNE 1.9 G 2.9 67°F 1015.2 hPa
46114 - West Monterey Bay, CA 43 mi49 min 59°F6 ft
MEYC1 44 mi69 min SSE 1.9 G 2.9 60°F 60°F1015.2 hPa
OBXC1 44 mi57 min 65°F 63°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 44 mi57 min NE 2.9 G 4.1 65°F 1015.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 44 mi57 min NE 2.9 G 4.1
PXOC1 - 9414311 - San Francisco (Pier 1), CA 45 mi57 min Calm G 1 63°F 1014.3 hPa
PXSC1 46 mi57 min 65°F
FTPC1 - 9414290 - San Francisco, CA 48 mi57 min NNW 1.9 G 2.9 62°F 62°F1015.5 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose, San Jose International Airport, CA9 mi52 minN 04.00 miFair with Haze67°F51°F57%1015.1 hPa
Mountain View, Moffett Field, CA14 mi55 minN 08.00 miOvercast64°F53°F68%1015.2 hPa
Watsonville, Watsonville Municipal Airport, CA22 mi52 minNNW 49.00 miFair62°F53°F73%1015.3 hPa

Link to 5 minute data for KSJC

Wind History from SJC (wind in knots)
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Last 24hrN4N4N4CalmN3CalmNW33N5NW7NW8NW6NW7NW6W3CalmCalmCalmCalmSE3SE4SE4SE3Calm
1 day agoCalmCalmCalmS3Calm44N5N5NW7NW8NW10NW11NW10NW9NW8N5NW7NW5N4N6N4N4N4
2 days agoCalmCalmSE4SE3CalmCalmCalmCalmCalm3W4NW9NW8NW10NW6NW8NW8NW5NW4CalmCalmSE3S3Calm

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
Click for Map
Thu -- 12:54 AM PDT     9.09 feet High Tide
Thu -- 06:45 AM PDT     Moonset
Thu -- 07:03 AM PDT     Sunrise
Thu -- 08:10 AM PDT     0.84 feet Low Tide
Thu -- 01:29 PM PDT     9.06 feet High Tide
Thu -- 02:06 PM PDT     Full Moon
Thu -- 06:50 PM PDT     Sunset
Thu -- 07:12 PM PDT     Moonrise
Thu -- 08:35 PM PDT     1.26 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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8.49.18.77.55.94.12.51.30.81.335.37.58.998.26.95.23.52.11.41.42.74.8

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
Thu -- 01:14 AM PDT     -0.00 knots Slack
Thu -- 05:35 AM PDT     -1.11 knots Max Ebb
Thu -- 06:45 AM PDT     Moonset
Thu -- 07:04 AM PDT     Sunrise
Thu -- 08:04 AM PDT     0.01 knots Slack
Thu -- 10:42 AM PDT     1.32 knots Max Flood
Thu -- 01:41 PM PDT     -0.00 knots Slack
Thu -- 02:06 PM PDT     Full Moon
Thu -- 05:53 PM PDT     -1.04 knots Max Ebb
Thu -- 06:50 PM PDT     Sunset
Thu -- 07:13 PM PDT     Moonrise
Thu -- 08:19 PM PDT     0.01 knots Slack
Thu -- 10:56 PM PDT     1.28 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.2-0.3-0.7-1-1.1-1.1-0.7-0.10.71.21.31.10.5-0.1-0.5-0.8-1-1-0.8-0.20.51.11.3

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.