Sunday, September27, 2020
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Marine Weather and Tides
Moraga, 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 6:59AMSunset 6:59PM Saturday September 26, 2020 9:26 PM PDT (04:26 UTC) Moonrise 3:46PMMoonset 12:46AM Illumination 75% Phase: Waxing Gibbous; Moon at 10 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- 830 Pm Pdt Sat Sep 26 2020
Tonight..W winds 5 to 15 kt. Hazy. Patchy smoke after midnight.
Sun..W winds up to 10 kt. Hazy and patchy smoke.
Sun night..N winds around 5 kt. Hazy and patchy smoke.
Mon..W winds up to 10 kt. Hazy and patchy smoke.
Mon night..N winds up to 10 kt. Hazy and patchy smoke.
Tue..NW winds up to 10 kt.
Tue night..W winds up to 10 kt.
Wed..W winds 5 to 15 kt.
Thu..W winds 5 to 15 kt.
PZZ500 830 Pm Pdt Sat Sep 26 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... North-northwest winds with strong gusts continue this evening, making for hazardous conditions for small craft vessels. Winds will decrease over the southern waters by Sunday afternoon with locally breezy conditions across the northern outer waters into Sunday evening. By Monday, high pressure will shift east allowing the winds to subside. Wind direction will pivot to the north and east Sunday evening before turning southeast on Monday. Northwest swell will gradually subside over the weekend while a light southerly swell also continues.


7 Day Forecast for Marine Location Near Moraga, CA
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location: 37.8, -122.12     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 262339 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 439 PM PDT Sat Sep 26 2020

SYNOPSIS. Sunny skies and a warming trend this afternoon. Red Flag Warnings start at 9 pm tonight for the North and East Bay with northeast winds developing in the hills. The offshore winds will mix down on Sunday leading to hot and dry weather across the entire Bay Area with warm temperatures all the way to the coast. A second burst of offshore winds Sunday night into Monday as Red Flag Warnings remain in effect through 9 pm Monday. Continued sunny and hot Monday with near record high temps in the 90s and lower 100s. Heat Advisory is in effect Sunday 11am to Monday 7pm for several locations interior locations and Bay Shoreline. Only gradual cooling inland next week as dry high pressure keeps temperatures above normal through the beginning of October.

DISCUSSION. as of 01:35 PM PDT Saturday . Notable pressure gradient between far Northern California and the Bay Area is evident this afternoon, with SFO-ACV table currently showing a gradient of 5.5 hPa. This is a result of the upper-level troughing immediately ahead of the building 594dm 500hPa ridge that is inching closer to the coast. 591dm heights are currently right along our southern waters and south of Monterey Bay as a result. Most of the coast is clearing out this afternoon as well thanks to the uptick in northerly flow at lower levels. The exception continues to be Monterey Bay this afternoon but are also expecting for most of those clouds to clear out later this evening as they continue to be advected out of the CWA waters. Winds at the mid- to-upper levels are still more northwesterly and should remain so for the next few hours. Red Flag Warning still set to begin tonight at 9PM for the East Bay hills/interior valleys and the entire North Bay until 9PM Monday.

As the upper-level ridge continues to move closer to the coast this afternoon and evening, expect air mass to rapidly warm overnight and into tomorrow. Local WRF has only been trending windier across the North and East Bay, with 925 hPa winds initially mixing down to higher-terrain areas (e.g. 35-45mph w/gusts up to 50mph, including the Napa hills. Higher confidence that these winds will eventually mix down to the North Bay valleys as well right before dawn tomorrow so have included the entire North Bay in the Red Flag Warning as well. This initial burst of offshore winds will also make way for a much drier air mass. Its effects will quickly be felt across the CWA, starting with RH values at elevations above 1000 ft dropping to 30-35%. Local WRF and NAM have continually gotten drier with every new run, so some isolated locations(especially in the North Bay) may get into the 25-29th percentile as early as dawn tomorrow.

Whatever marine stratus we have tomorrow morning will be completely extinguished early on in the day as the hot and dry air mass associated with these offshore winds overtakes the entire CWA. 850hPa temps will rapidly ascend to 22-23 C by early tomorrow afternoon, translating into 95-105F in the interior, upper-70s F to low 80s F pushing close to the coast, and 70s F right at the beaches. The Bay Shoreline looks set to reach 90 F in most locations tomorrow, including downtown SF.

Both the local WRF and NAM suggesting that RH values will plummet all across the CWA tomorrow and especially overnight and into Monday morning. Expecting RH values in the teens all across the North and East Bay, along with a second burst of moderate offshore winds. While RH values aren't progged to drop into the same percentiles as what is expected for the North and East Bays, it will still be dry with locations along the Santa Cruz Mountains dropping to 25-30%. These offshore winds will once again mix down to lower elevations and make for critical conditions through at least Monday morning in the North and East Bay. Emphasis needs to be placed on the duration of these dry, windy conditions: there will essentially be no humidity recoveries overnight this weekend across the areas under the Red Flag Warning, with some locations going as long as 36 hours with RH values below 20%, which will greatly dry out the fine fuels that have otherwise been protected by the marine layer the last few days. As such, fire concerns are cannot be overstated.

For the latest on active wildfires, please refer to CALFIRE. In the event that you spot a wildfire start, please alert your local authorities.

In terms of air quality, HRRR-smoke takes a notable amount of the smoke canopy associated with the August Complex down into the North Bay starting around 9-11pm Saturday as the offshore winds get going. Smoke concerns are nowhere near as high as what has been observed over the area in recent weeks given the much smaller volume of smoke, so only expecting moderate levels in the North Bay and for some hazy conditions to make their way down into the Bay Area. it should be noted that this smoke forecast only takes into account active wildfires, so should any new wildfire starts occur in the next couple of days, will have to modify current smoke concerns.

For more information on air quality concentrations in your area, please refer to the Bay Area Air Quality District and/or AirNow.

Given the nature of the upper-level ridge and the development of a thermal surface low over the region, along with the mixing associated with these offshore winds, expecting hot temps to further encroach the coast on Monday, with 80s F hugging the coastline, temps in the upper-90s F over much of the Bay Shoreline, and low-90s F snaking down into lower-elevation areas in Santa Cruz County. Have added a Heat Advisory for the Bay Shoreline and most of the South Bay from Sunday 11AM to Monday 7PM for the North Bay, East Bay, and South Bay along with the Bay Shoreline and all of SF, but have left out coastal Santa Cruz county, San Benito county, and Monterey county as medium-range guidance is picking up on a mesolow along our southern waters that should help return onshore flow to those areas through Monday evening.

Some more onshore flow looks set to return next week as the upper- level ridge moves deeper into the Great Basin, but are still expecting warmer than average conditions to last through the end of the month, with GEFS and ECMWF ensemble members not showing a break in this pattern in the immediate future. Stay tuned.

AVIATION. As of 04:37 PM PDT Saturday . For the 00z TAFs. Passing high clouds over the North Bay, otherwise VFR across the region and expected through the TAF period. While surface winds subside tonight, winds aloft will strengthen and rotate to the NNE, especially over the North and East Bay terminals (KSTS, KAPC, KLVK) for LLWS added to their respective TAFs for overnight and early Sunday morning. Any overnight development of the marine layer is expected to be minimal, limited cloud cover over the area. With northerly winds present, smoke from North California can move into the area for slant range vis issues to increase overnight. There is low confidence in it become dense therefore not currently anticipating significant issues. Winds will remain offshore Sunday and breezy in the afternoon with a few stronger gusts.

Vicinity of KSFO . VFR with a few passing high clouds. Winds remain northwesterly above 20 kts. Stronger gusts up to 30 kts possible up to 3z. May see some haze tonight and tomorrow as winds shift out of the north and bring in wildfire smoke. VFR expected through the TAF period with limited marine layer influence. Winds will ease overnight before becoming breezier Sunday afternoon with little cloud cover.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR. Stratus is expected to develop over the Bay, but low confidence in it moving over land and impacting terminals overnight and into Sunday morning. Low confidence in slant range vis issues beginning late tonight, but with winds aloft becoming NNE, smoke might move near terminals aloft. Surface winds ease overnight before an afternoon seabreeze on Sunday. VFR forecast Sunday.

CLIMATE. Here are the record high temperatures for Saturday through Monday .

. SATURDAY . SUNDAY . MONDAY SANTA ROSA . 103 in 2009 . 103 in 2010 . 104 in 2010 KENTFIELD . 99 in 2016 . 103 in 1921 . 102 in 1921 NAPA . 105 in 1963 . 101 in 1958 . 102 in 1966 RICHMOND . 97 in 2019 . 97 in 2010 . 97 in 2010 LIVERMORE . 103 in 1952 . 105 in 1963 . 105 in 2010 SAN FRANCISCO . 94 in 1992 . 93 in 2010 . 95 in 1966 SF AIRPORT . 95 in 1958 . 96 in 2010 . 95 in 2010 REDWOOD CITY . 99 in 1963 . 97 in 2010 . 98 in 2010 HALF MOON BAY . 90 in 1970 . 89 in 1966 . 91 in 1958 OAKLAND DOWNTOWN . 93 in 2016 . 95 in 1973 . 92 in 2010 SAN JOSE . 98 in 2016 . 98 in 1921 . 99 in 2010 GILROY . 104 in 1963 . 108 in 1963 . 101 in 1963 SANTA CRUZ . 101 in 1970 . 103 in 2010 . 100 in 1917 SALINAS . 101 in 2016 . 102 in 2010 . 99 in 1970 KING CITY . 105 in 1963 . 107 in 2010 . 102 in 1973

FIRE WEATHER. as of 5:30 AM PDT Saturday . Warming trend starts today as northerly winds aloft bring smoke from the August complex over the Bay Area. Northeast winds first impact the Napa hills after 9 pm tonight with initial burst of offshore winds staying in the hills. Overnight into early Sunday morning the winds may start to mix down to the North Bay valleys. Breezy offshore winds and drying trend through the day Sunday with biggest impacts for the North and East Bay. A second burst of wind arrives Sunday night when very dry conditions will be occurring across the entire region. East winds Sunday night into Monday morning will drive all the way to the coast of Sonoma southward to Half Moon Bay as dry offshore flow spills towards the ocean. Heads up on the Dolan Fire Monday as return flow from the Santa Ana down south returns northward in the form of southerly winds along the Big Sur Coast and Los Padres Forest. Long range trends remain unseasonably hot and dry through early October.

MARINE. as of 02:02 PM PDT Saturday . Gusty north to northwest winds will continue over the coastal waters through tonight as high pressure remains over the eastern Pacific. Locally breezy conditions will persist across the northern outer waters into tomorrow evening. High pressure will shift east into the Pacific Northwest late tomorrow and Monday causing winds to ease while shifting out of the north and east before turning east to southeast on Monday. Northwest swell will gradually subside over the weekend while a light southerly swell also continues.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. Red Flag Warning . CAZ505>507-510-511 SCA . Mry Bay until 9 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm until 9 PM SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . Pt Reyes to Pigeon Pt 0-10 nm until 3 AM



PUBLIC FORECAST: Diaz AVIATION: DK MARINE: AS FIRE WEATHER: RWW

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LNDC1 9 mi57 min NNW 2.9 G 5.1 74°F 1013.6 hPa
AAMC1 - 9414750 - Alameda, CA 10 mi57 min W 4.1 G 5.1 70°F 70°F1013.9 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 11 mi57 min NNW 1.9 G 2.9 68°F 1013.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 11 mi57 min SW 1.9 G 2.9
OBXC1 12 mi57 min 70°F 61°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 14 mi57 min NNW 4.1 G 6 69°F 1012.8 hPa
PXSC1 15 mi57 min 71°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 15 mi57 min WNW 6 G 9.9 75°F 1014 hPa
UPBC1 16 mi57 min WNW 11 G 15
MZXC1 - 9415102 - Martinez-Amorco CA 16 mi57 min W 11 G 12 75°F 71°F1013.2 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 18 mi46 min NW 2.9 73°F 1014 hPa
RCMC1 - 9414863 - Richmond, CA 18 mi57 min WNW 6 G 8.9 72°F 65°F1013.3 hPa
PCOC1 - 9415144 - Port Chicago, CA 18 mi57 min WSW 5.1 G 6 74°F 71°F1013 hPa
FTPC1 - 9414290 - San Francisco, CA 18 mi57 min WSW 9.9 G 15 67°F 62°F1013.8 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 19 mi57 min SW 5.1 G 7 74°F 1013.2 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 21 mi57 min WNW 8 G 11 78°F 1012.8 hPa
RTYC1 - 9414523 - Redwood City, CA 21 mi57 min W 4.1 G 5.1 71°F 73°F1014.4 hPa
46237 - San Francisco Bar, CA (142) 27 mi57 min 55°F7 ft
SFXC1 - San Francisco Bay Reserve, CA 28 mi102 min W 1
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 38 mi37 min NW 21 G 25 56°F9 ft1014.7 hPa

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA9 mi34 minN 010.00 miMostly Cloudy71°F59°F66%1013.7 hPa
Hayward, Hayward Air Terminal, CA10 mi33 minN 010.00 miFair70°F60°F71%1014.6 hPa
Concord, Buchanan Field, CA13 mi34 minN 010.00 miHaze Smoke78°F55°F45%1011.8 hPa
Livermore, Livermore Municipal Airport, CA17 mi34 minN 010.00 miSmoke72°F57°F59%1013.1 hPa
San Francisco, San Francisco International Airport, CA18 mi31 minWNW 1410.00 miPartly Cloudy67°F55°F66%1013.6 hPa
San Carlos Airport, CA20 mi40 minW 510.00 miClear73°F55°F53%1013.9 hPa
Palo Alto Airport, CA22 mi2.7 hrsNNW 1010.00 miClear73°F55°F53%1013.5 hPa

Link to 5 minute data for KOAK

Wind History from OAK (wind in knots)
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Last 24hrS3S6S6S6W4CalmE4E3E3E3E3SE4SW4SW6SW6W9W9W11W13W9W8SW6W5Calm
1 day agoW11W10W7W4W8W6W9W9W8W12W4W4W54W6W9W11W13W12W13W13W11SW5SE5
2 days agoNW6W4CalmCalmSE4CalmW8W5W3CalmW8W6SW4W6W9W7W10W11W10W17W18W15W14W11

Tide / Current Tables for San Leandro Channel, San Leandro Bay, San Francisco Bay, California
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San Leandro Channel
Click for Map
Sun -- 02:48 AM PDT     Moonset
Sun -- 04:06 AM PDT     0.07 feet Low Tide
Sun -- 07:01 AM PDT     Sunrise
Sun -- 11:04 AM PDT     6.05 feet High Tide
Sun -- 04:24 PM PDT     2.35 feet Low Tide
Sun -- 05:23 PM PDT     Moonrise
Sun -- 06:57 PM PDT     Sunset
Sun -- 10:08 PM PDT     6.57 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.22.71.30.40.10.312.13.44.75.665.84.93.82.92.42.53.14.15.26.16.66.3

Tide / Current Tables for Oakland Harbor High Street Bridge, San Francisco Bay, California Current
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Oakland Harbor High Street Bridge
Click for Map
Sun -- 02:48 AM PDT     Moonset
Sun -- 04:05 AM PDT     0.00 knots Slack
Sun -- 07:01 AM PDT     Sunrise
Sun -- 07:08 AM PDT     1.71 knots Max Flood
Sun -- 10:19 AM PDT     -0.01 knots Slack
Sun -- 01:08 PM PDT     -0.88 knots Max Ebb
Sun -- 04:19 PM PDT     0.01 knots Slack
Sun -- 05:23 PM PDT     Moonrise
Sun -- 06:57 PM PDT     Sunset
Sun -- 07:00 PM PDT     1.21 knots Max Flood
Sun -- 09:44 PM PDT     -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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-1.5-1.4-1.2-0.7-0.10.81.41.71.610.2-0.4-0.8-0.9-0.8-0.6-0.20.511.21.10.6-0.2-1

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.