Sunday, April5, 2020
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Marine Weather and Tides
Danville, 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 6:44AMSunset 7:36PM Sunday April 5, 2020 12:46 PM PDT (19:46 UTC) Moonrise 3:57PMMoonset 4:40AM Illumination 95% 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 837 Am Pdt Sun Apr 5 2020
.small craft advisory in effect until 1 pm pdt this afternoon...
Today..S winds 15 to 25 kt, becoming sw 10 to 20 kt this afternoon. Showers. A slight chance of Thunderstorms this afternoon.
Tonight..W winds up to 10 kt. A chance of showers.
Mon..N winds around 5 kt. A chance of showers.
Mon night..W winds up to 10 kt.
Tue..W winds around 5 kt.
Tue night..W winds 5 to 10 kt.
Wed..W winds up to 10 kt.
Thu..SW winds up to 10 kt. Winds and wind waves higher in and near Thunderstorms.
PZZ500 837 Am Pdt Sun Apr 5 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate to heavy showers will persist today along with a slight chance of Thunderstorms due to a cold upper low moving in from the gulf of alaska. This will also result in breezy west to southwest winds across portions of the coastal waters. The low will slowly exit the area into Tuesday before high pressure rebuilds over the eastern pacific mid to late next week. A prevailing moderate northwesterly swell will persist through much of the forecast period.


7 Day Forecast for Marine Location Near Danville, CA
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location: 37.79, -122     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 051731 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1031 AM PDT Sun Apr 5 2020

SYNOPSIS. Widespread rain is forecast for today as a stronger system drops down the coast. Locally heavy rain, possible thunderstorms, and gusty winds can be expected with this system. Rain will turn to showers tonight into Monday as an upper low moves south offshore. Showers may linger across the Central Coast into Tuesday, and possibly Wednesday, as the upper low slowly exits the region. A warming and drying trend is forecast for the second half of the week.

DISCUSSION. as of 08:48 AM PDT Sunday . An active start to your Sunday as a deepening low pressure system is spinning off the Eureka Coast. This storm has already brought rain and wind to the Bay Area. A quick recap of the last 12 hours: Rainfall amounts have been greatest over the Santa Cruz Mts with 2-3", East Bay Hills/Santa Lucia Mts 1-2", elsewhere ranges from a few 0.0" to 0.75" depending on location. There have been some reports of minor ponding on roadways. As far as streams go, gauges around the region have shown a response, but there is plenty of room left before water overflows the banks. Winds have been gusty as well with the strongest winds near the coastline and higher terrain ranging from 35-60 mph. We have received a few reports of tree limbs down due to the gusty winds. Satellite imagery also shows some decent convective build ups off the coast. Lightning detection networks have picked up a few strikes well offshore. The airmass is definitely unstable as indicated by the 12Z Oakland sounding indicating some CAPE.

For the rest of the day - it will be a good day to stay inside. The aforementioned low spinning off the coast is forecast to drift southward through the day. As a result, another frontal boundary is forecast to move through the Bay Area. Therefore, showers, some of them heavy at times, will persist through the day. Instability increases this afternoon with the front and daytime heating. Therefore, thunderstorms will also be possible, which fits the Day 1 Outlook for thunderstorms from SPC. Winds will remain breezy to gusty and could possibly see an uptick as the front passes later today. A Wind Advisory remains in effect for the Monterey/Big Sur region through this evening. Latest hi- res models continue to advertise gusty winds over the Monterey Peninsula and the Big Sur Coast.

Operational staff in the office today will monitor thunderstorm development and heavy showers for localized impacts. Be weather aware through out the day, especially if thunderstorms develop.

Will likely do a morning update to fine tune current forecast.

PREV DISCUSSION. As of 3:10 AM PDT Sunday .

The front will continue a slide south and east at approximately 5 to 10 kt and is forecast to be overrun by the next boundary pushing in from the northwest. This next system will bring widespread rain to the region today with periods of heavy rain expected as this significantly stronger cold front moves through. Latest model runs remain consistent with the timing of the front and have this next front moving into the North Bay this morning then sliding south into the Bay Areas in through the afternoon and through the Monterey Bay Area late in the afternoon and early evening. WPC's (Weather Prediction Center) latest guidance put the Central California Coast at a slight risk (10-20%) of Excessive Rainfall for today, meaning there is a slight chance that rainfall will exceed flash flood guidance. The slight risk category is generally confined to the Santa Lucia mountains while the Monterey peninsula and portion of the Santa Cruz mountains remains in a marginal (5-10% risk). See go.usa.gov/cu3Dw for more information.

SPC (Storm Prediction Center) Day 1 Convective Outlook continues to show thunderstorm chances across the forecast area. The 06z NAM continues to show significant instability over the district for the next 12 to 16 hours therefore the slight chance of isolated thunderstorms across the area remains in place for this morning through 00z this afternoon.

From previous discussion . Additional rainfall through late Sunday is expected to range from 0.50-1.50" in most areas, with locally lower amounts in rain- shadowed valleys such as the Santa Clara Valley. Up to 2-3 inches of additional rainfall is possible in the coastal ranges. The latest HRRR focuses the heaviest rain in the Santa Lucia Mountains above Big Sur, with accumulations of up to 7 inches by Sunday evening. Most other models forecast less than half that in the Santa Lucias.

Gusty southerly winds will develop ahead of the incoming front on Sunday. Strongest winds are expected along the coast where local gusts up to 40 mph are possible. The latest local WRF model continues to focus the strongest winds on coastal Monterey County from Pebble Beach south through Carmel and along the Big Sur Coast. A Wind Advisory is in effect for coastal Monterey County from 5 AM to 5 PM Sunday. The WRF model has recently trended lighter on winds, but will maintain the Wind Advisory for now as subsequent models may reverse course. Winds are forecast to diminish quickly behind the cold front by late Sunday.

Rain will change to showers on Sunday night and showers will continue through Monday as an upper low moves slowly south offshore. Snow levels are forecast to quickly drop behind the cold front on Sunday night, down to 3000 feet or even lower in the North Bay by Monday morning. However, most precipitation will end by the time the coldest airmass arrives and so snow accumulation in the hills above 3000 feet should be light.

Both the NAM and GFS are moving the upper low off to our south more quickly than previous model runs. If this faster movement verifies, then showers will be confined to only the far southern portion of our area on Tuesday, with dry weather returning to all areas by Wednesday. The 12Z ECMWF forecasts a slower southward movement and thus continued shower potential across our southern areas through Wednesday. But the overall model trend is for a quicker return to dry weather next week. The upshot is that the northern portion of our area will likely start to dry out as early as Tuesday, with all areas possibly returning to dry weather by Wednesday, or Thursday at the latest. Dry weather is then expected to prevail for the remainder of next week and into next weekend as an upper ridge develops off the West Coast. Temperatures are expected to be below normal for the first half of the week, but then climb back to near seasonal averages during the second half.

AVIATION. as of 10:31 AM PDT Sunday . For 18z tafs. Borderline MVFR/VFR conditions with occasional IFR cigs/vis possible during heavier showers. Expect rainfall into this evening before turning to showers and becoming more widely scattered. Thunderstorms remain a possibility mainly this afternoon into the early evening. Showers will remain in the vicinity around the Bay Area and southward through the taf period as the core of the upper low continues to influence the region. Clearer conditions expected across the North Bay behind the frontal system. Lingering low level moisture may create patchy fog tomorrow morning over the North Bay depending on the degree of cloud cover overnight.

Gusty SE to SW winds continue this morning at around 10-15 kt with gusts of 20 to almost 30 kt. SW/W winds anticipated this afternoon with winds becoming less gusty and then gradually diminishing into the evening hours.

Vicinity of KSFO . S to SE winds should begin shifting towards the SW over the next couple of hours. Should the shift in winds be delayed, the taf will be updated accordingly. Borderline VFR/MVFR conditions with IFR cigs/vis possible during heavier showers. Statistical guidance has backed off on the wind gusts this morning though gusts of around 25 kt will remain possible into the afternoon. Expecting more SW winds this afternoon and evening before winds ease overnight.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . S/SE winds with gusts of 20-25 kt still possible. Winds expected to shift more SW/W this afternoon before winds ease this evening. Borderline MVFR/VFR conditions with IFR cigs/vis possible during heavier showers. Showers to remain in the vicinity through the period.

MARINE. as of 10:21 AM PDT Sunday . Moderate to heavy showers will persist today along with a slight chance of thunderstorms due to a cold upper low moving in from the Gulf of Alaska. This will also result in breezy west to southwest winds across portions of the coastal waters. The low will slowly exit the area into Tuesday before high pressure rebuilds over the eastern Pacific mid to late next week. A prevailing moderate northwesterly swell will persist through much of the forecast period.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. Wind Advisory . CAZ530 SCA . Mry Bay SCA . Pigeon Pt to Pt Pinos 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm until 3 PM SCA . SF Bay until 1 PM SCA . Pt Arena to Pt Reyes 0-10 nm until 1 PM SCA . Pt Reyes to Pigeon Pt 0-10 nm until 1 PM



PUBLIC FORECAST: MM/CW AVIATION: AS MARINE: AS

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LNDC1 15 mi46 min W 6 G 8.9 51°F 1005.3 hPa (+2.2)
AAMC1 - 9414750 - Alameda, CA 16 mi46 min W 7 G 11 52°F 58°F1005.4 hPa (+2.0)
UPBC1 18 mi46 min SW 6 G 11
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi46 min WNW 11 G 13 51°F 1005.3 hPa (+2.1)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 18 mi46 min WSW 4.1 G 6 52°F 1004.7 hPa (+1.7)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi46 min W 9.9 G 13
PCOC1 - 9415144 - Port Chicago, CA 18 mi46 min S 8 G 9.9 51°F 58°F1004.4 hPa (+1.7)
OBXC1 18 mi46 min 52°F 49°F
MZXC1 - 9415102 - Martinez-Amorco CA 18 mi46 min S 7 G 8 52°F 58°F1004.7 hPa (+1.7)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi46 min SW 14 G 17 53°F 1005.2 hPa (+2.4)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 21 mi46 min W 7 G 12 52°F 1004.3 hPa (+2.2)
PXSC1 21 mi46 min 52°F 51°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 23 mi46 min SW 8.9 G 11 53°F 1004.2 hPa (+2.4)
RTYC1 - 9414523 - Redwood City, CA 23 mi46 min WSW 4.1 G 6 52°F 60°F1005.7 hPa (+1.7)
RCMC1 - 9414863 - Richmond, CA 24 mi46 min SW 6 G 8.9 53°F 56°F1004.7 hPa (+2.0)
FTPC1 - 9414290 - San Francisco, CA 25 mi46 min 58°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 25 mi36 min NNW 4.1 52°F 1005 hPa
SFXC1 - San Francisco Bay Reserve, CA 28 mi61 min SSW 8
46237 - San Francisco Bar, CA (142) 34 mi46 min 54°F6 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 45 mi26 min W 9.7 G 14 51°F 52°F1006.1 hPa

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hayward, Hayward Air Terminal, CA11 mi52 minS 69.00 miLight Rain51°F48°F89%1006.3 hPa
Livermore, Livermore Municipal Airport, CA11 mi53 minSW 93.00 miRain Fog/Mist49°F46°F90%1005.3 hPa
Concord, Buchanan Field, CA13 mi53 minS 49.00 miLight Rain52°F48°F89%1003.3 hPa
Oakland, Metro Oakland International Airport, CA13 mi53 minWSW 105.00 miLight Rain54°F48°F83%1005.4 hPa
San Carlos Airport, CA22 mi59 minWSW 58.00 miOvercast54°F48°F82%1005.8 hPa
Palo Alto Airport, CA22 mi59 minSW 77.00 miLight Rain52°F48°F88%1005.8 hPa
San Francisco, San Francisco International Airport, CA22 mi50 minW 83.00 miLight Rain52°F46°F83%1005.3 hPa

Link to 5 minute data for KLVK

Wind History from LVK (wind in knots)
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1 day ago6SW55W8W11W10W8W8SW6SW5SW8SW5SW5S5S8S7S5S7SW8S9SW8SW8W5SW7
2 days agoNW114--W16----W8S3S4SW5CalmCalmCalmCalmCalmN3CalmCalmCalmCalmCalmW33SW4

Tide / Current Tables for Roberts Landing, 1.3 miles west of, San Francisco Bay, California
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Roberts Landing
Click for Map
Sun -- 05:22 AM PDT     1.79 feet Low Tide
Sun -- 05:40 AM PDT     Moonset
Sun -- 06:47 AM PDT     Sunrise
Sun -- 10:52 AM PDT     7.14 feet High Tide
Sun -- 04:58 PM PDT     Moonrise
Sun -- 05:47 PM PDT     -0.30 feet Low Tide
Sun -- 07:35 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.55.84.73.42.41.822.94.25.76.87.16.75.642.30.8-0.1-0.30.41.73.356.3

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 -- 01:02 AM PDT     -1.32 knots Max Ebb
Sun -- 04:48 AM PDT     0.00 knots Slack
Sun -- 05:40 AM PDT     Moonset
Sun -- 06:47 AM PDT     Sunrise
Sun -- 07:24 AM PDT     1.67 knots Max Flood
Sun -- 10:28 AM PDT     -0.00 knots Slack
Sun -- 01:15 PM PDT     -1.94 knots Max Ebb
Sun -- 04:58 PM PDT     Moonrise
Sun -- 05:19 PM PDT     0.01 knots Slack
Sun -- 07:36 PM PDT     Sunset
Sun -- 08:03 PM PDT     2.13 knots Max Flood
Sun -- 11:24 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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-1-1.3-1.2-0.9-0.50.21.11.61.61.20.5-0.5-1.5-1.9-1.8-1.5-0.9-0.20.81.82.11.91.40.4

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 (15,3,4,5)
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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.