Friday, August14, 2020
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Marine Weather and Tides
El Granada, 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 6:24AMSunset 8:04PM Friday August 14, 2020 12:19 AM PDT (07:19 UTC) Moonrise 12:49AMMoonset 3:53PM Illumination 22% Phase: Waning Crescent; Moon at 25 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- 814 Pm Pdt Thu Aug 13 2020
Tonight..NW winds 5 to 15 kt.
Fri..NW winds 5 to 15 kt.
Fri night..NW winds up to 10 kt.
Sat..NW winds 5 to 15 kt.
Sat night..W winds up to 10 kt.
Sun..W winds 5 to 15 kt.
Sun night..W winds 5 to 10 kt.
Mon..W winds 5 to 15 kt.
Tue..W winds 5 to 15 kt.
PZZ500 814 Pm Pdt Thu Aug 13 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Remnant tropical moisture will bring a chance of Thunderstorms to the southern waters into this evening. Locally gusty winds, rough seas, and frequent lightning with some of these cells will be possible. Otherwise, generally light to moderate northwest winds across the waters through the weekend aside from locally breezy winds over the northern outer waters into this evening. Mixed seas will persist through the period with a short period northwest swell and two longer period southerly swells.


7 Day Forecast for Marine Location Near El Granada, CA
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location: 37.5, -122.48     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 140534 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1034 PM PDT Thu Aug 13 2020

SYNOPSIS. Hot temperatures Friday into the weekend with inland Excessive Heat Warnings and Bayside Heat Advisories in effect. Continued hot through early next week.

DISCUSSION. as of 10:07 pm Thursday . Interesting weather day for the Central Coast with KMUX radar lit up much of the day. However little or no lightning over land. Latest scans shows most showers now offshore, west of Big Sur. Latest model simulations suggest that any convection will reorganize offshore, closer to the main upper low. IR satellite shows slug of mid and high level clouds now over the Bay Area. These clouds kept places like Parkfield in southern Monterey county with a relatively cool high of 81 (its usually the hottest spot in the cwa) while the Bay Area got a taste of heat with a record tying high of 95 at Redwood City while Concord and Livermore both exceeded 100 degrees.

Heat Warnings go into effect Friday for inland areas and last through the weekend and into early next week per coordination with neighboring offices. Strong ridge over the Desert Southwest will bring significant heat to much of the state while the remnant moisture (clouds) over the area has brought some humidity rises and associated increased heat risk. Heat Advisory is in place around the Bay including Santa Cruz county on Friday. No headlines for the City or coast but there will be little seabreeze with warm temps all the way to the coast given the lack of a marine inversion layer. Will be monitoring day to day heat advisories this weekend for bayside locations while interior hot weather looks to be a slam dunk thus the continuous excessive heat warning.

Will peruse the 00z data shortly but no big weather changes forecast for awhile. Be ready for a prolonged heat event with little night time relief. Fires across the state are showing explosive growth, even in the absence of wind so please use caution with any fire sources given the dry and receptive fuels.

PREV DISCUSSION. as of 1:52 PM PDT Thursday . Storms fired up this morning across our southern waters and slowly moved to the northeast, becoming more enhanced by the slug of moisture from the remnants of tropical storm Elida that has been moving up along the California coast. The 12Z NAM-12km run from today captured some of the morning elevated convection off the coasts of Santa Barbara and SLO Counties but failed to capture the larger cluster of elevated convection that developed over the southern waters of our CWA this morning as well. This larger cluster weakened significantly by 19Z and its outflow has ignited some new storms due west of it while the elevated convection closer to SLO county came ashore late this morning. Similar elevated convection is expected to move into far southern Monterey County this afternoon as well. High cirrus associated with both clusters has engulfed most of the southern CWA and made it into parts of the Bay Area. Our 18Z sounding was able to capture some of the weak instability at the mid-levels along with some of the 300-250hPa cirrus.

Depending on how quickly the moisture moves into the central and northern CWA today and through early Friday afternoon, could see more storms training off the coast through the period and potentially making their way ashore, with the highest confidence still being for convection to trail over southern Monterey County. PWATs remain over >1 inch across the CWA as the tropical moisture treks northward. Air mass near the surface is still dry. Thankfully the majority of the lightning that has been detected since dawn has been offshore. Moreover, as more moisture moves overhead we can expect for any storms that move ashore later tonight and into tomorrow morning to be wet thunderstorms. In the meantime, continue to monitor lightning as the elevated convection continue coming ashore. Expecting the majority of this tropical moisture to depart our CWA by Saturday.

Outside of the convection, marine layer compression has continued through the day as the weak offshore low is cast aside by the expanding upper-level ridge over the Southwestern US. The Nam12km runs continue to keep us slightly warmer than the GFS20km runs, but regardless we are expecting warm coastal conditions along the coast and hot conditions across the interior. In the coming days, 590dm heights are progged to move into our area. Both the 12Z GFS- 20km and NAM-12km runs from today have increased their confidence for 850hPa temps over 25 deg C across the CWA by Friday afternoon as the ridge builds to a 596dm. Unlike what has happened for the most part this summer, the offshore mid-level low will not be the dominating synoptic pattern for the weekend. Coastal locations will likely make it into the low 80s through the weekend while interior locations will easily climb the mid-90s F, with up to 108 F in some of our warmest locations like Lake Berryesa and Pinnacles. Also not expecting much in the way of temperature recoveries this weekend, with overnight mins staying rather mild all across the CWA. As the ridge builds through the weekend and into the first half of next week, the 00Z GFS ensembles move the center of the ridge closer to the Utah/Nevada border, while the 00Z ECMWF run from today takes a more aggressive approach and builds it to 601dm over central Nevada and moves 569dm-598dm heights into our CWA Monday evening. Will keep a close eye on the latest model runs in order to assess how long the heat wave will persist across the CWA, but at the moment it's looking like aside from some minor cooling during the middle of next week, this will be a prolonged event.

In the meantime, excessive heat warning is now in effect across the entire from Friday into Wednesday while a heat advisory has been issued only for targeted regions of the North Bay valleys, SF shoreline, and the Santa Cruz Mountains.

AVIATION. as of 10:34 PM PDT Thursday . for 06z TAFs. It's VFR except for a few patches of LIFR in patchy coastal stratus vicinity KHAF. Mid and high clouds continue to move northward to the Bay Area, most of the showers have remained offshore or south of the terminals.

Vicinity of KSFO . VFR. Mid to high clouds overnight into Friday.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR. Mid to high clouds overnight and Friday.

MARINE. as of 9:54 PM PDT Thursday . Remnant tropical moisture will bring a chance of thunderstorms to the southern waters into this evening. Locally gusty winds, rough seas, and frequent lightning with some of these cells will be possible. Otherwise, generally light to moderate northwest winds across the waters through the weekend aside from locally breezy winds over the northern outer waters into this evening. Mixed seas will persist through the period with a short period northwest swell and two longer period southerly swells.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pt Arena to Pigeon Pt 10-60 nm until 3 AM



PUBLIC FORECAST: RWW AVIATION/MARINE: Canepa

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 14 mi50 min NNW 2.9 G 5.1 73°F 76°F1013.7 hPa
46237 - San Francisco Bar, CA (142) 21 mi50 min 60°F4 ft
AAMC1 - 9414750 - Alameda, CA 21 mi50 min NNE 1.9 G 5.1 70°F 71°F1013.3 hPa
FTPC1 - 9414290 - San Francisco, CA 21 mi50 min SSW 4.1 G 8.9 62°F 63°F1013.4 hPa
PXSC1 21 mi50 min 69°F 60°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 21 mi50 min SSE 5.1 G 6 67°F 1012.2 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 22 mi50 min ENE 6 G 8
OBXC1 22 mi50 min 68°F 57°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 23 mi30 min NW 9.7 G 12 59°F 5 ft1014 hPa57°F
LNDC1 23 mi50 min NE 6 G 7 68°F 1013.2 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 23 mi50 min ENE 4.1 G 4.1 66°F 1013.3 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 26 mi30 min NW 9.7 G 14 58°F 58°F4 ft1013.6 hPa56°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi56 min Calm 66°F 1013 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi50 min E 1 G 4.1 68°F 1013.7 hPa
RCMC1 - 9414863 - Richmond, CA 29 mi50 min ESE 4.1 G 6 67°F 67°F1013 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 40 mi50 min WSW 5.1 G 6 71°F 1012.6 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 41 mi50 min W 5.1 G 6 74°F 69°F1012.9 hPa
UPBC1 42 mi50 min WNW 7 G 8
PCOC1 - 9415144 - Port Chicago, CA 45 mi50 min SW 6 G 7 74°F 73°F1012.5 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 49 mi50 min WNW 7 G 9.9 83°F 1012.3 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA1 mi25 minNW 65.00 miFog/Mist61°F57°F88%1012.9 hPa
San Francisco, San Francisco International Airport, CA10 mi24 minNNE 410.00 miPartly Cloudy70°F57°F66%1012.7 hPa
San Carlos Airport, CA12 mi25 minNW 310.00 miFair73°F53°F50%1013.2 hPa
Oakland, Metro Oakland International Airport, CA20 mi27 minN 310.00 miMostly Cloudy71°F53°F53%1013 hPa
Hayward, Hayward Air Terminal, CA22 mi26 minN 010.00 miFair76°F54°F47%1013.5 hPa
Mountain View, Moffett Field, CA23 mi25 minN 010.00 miOvercast73°F57°F57%1012.9 hPa

Link to 5 minute data for KHAF

Wind History from HAF (wind in knots)
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Last 24hrNE5CalmCalmCalmCalmCalmCalmCalmCalmSW5S7S8SW6SW5W9SW6S4----NW8N5NW5NW4NW6
1 day agoSE4CalmCalmCalmCalmCalm--SW3W3W3----NW7W6W8NW7NW11NW10NW8NW6NW6N4CalmCalm
2 days agoS5S7S5SE7SE7SE5SE6SE5S7S8S11S8S8S8S6--SW5W5SW3W3W3--SW3SW4

Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
Click for Map
Fri -- 01:48 AM PDT     Moonrise
Fri -- 02:03 AM PDT     0.57 feet Low Tide
Fri -- 06:25 AM PDT     Sunrise
Fri -- 09:13 AM PDT     3.85 feet High Tide
Fri -- 01:32 PM PDT     3.20 feet Low Tide
Fri -- 04:53 PM PDT     Moonset
Fri -- 07:20 PM PDT     5.60 feet High Tide
Fri -- 08:02 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.30.80.60.71.21.82.53.13.63.83.83.63.43.23.23.544.75.25.65.554.13

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Fri -- 01:13 AM PDT     -1.38 knots Max Ebb
Fri -- 01:47 AM PDT     Moonrise
Fri -- 05:06 AM PDT     0.01 knots Slack
Fri -- 06:24 AM PDT     Sunrise
Fri -- 08:05 AM PDT     1.23 knots Max Flood
Fri -- 11:33 AM PDT     -0.01 knots Slack
Fri -- 01:51 PM PDT     -0.53 knots Max Ebb
Fri -- 04:45 PM PDT     0.00 knots Slack
Fri -- 04:52 PM PDT     Moonset
Fri -- 07:22 PM PDT     0.91 knots Max Flood
Fri -- 08:01 PM PDT     Sunset
Fri -- 10:27 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.2-1.4-1.3-1-0.6-0.10.61.11.21.10.80.3-0.2-0.5-0.5-0.4-0.20.10.60.90.90.60.3-0.3

Weather Map
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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.
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Wind Forecast for San Francisco/Monterey Bay Area, CA (3,6,7,8)
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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.