Monday, May10, 2021
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Marine Weather and Tides
Pleasanton, CA

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:00AMSunset 8:07PM Monday May 10, 2021 2:07 PM PDT (21:07 UTC) Moonrise 4:40AMMoonset 6:18PM Illumination 1% Phase: New Moon; Moon at 29 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- 810 Am Pdt Mon May 10 2021
Today..W winds 5 to 15 kt. Gusts up to 25 kt this afternoon.
Tonight..NW winds 5 to 15 kt.
Tue..NW winds 5 to 15 kt.
Tue night..NW winds up to 10 kt.
Wed..NW winds 5 to 15 kt.
Wed night..NW winds 5 to 10 kt.
Thu..W winds 5 to 15 kt.
Fri..W winds 10 to 20 kt.
PZZ500 810 Am Pdt Mon May 10 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate to locally strong northwest winds for today with gale force gusts over the northern outer waters into this afternoon. These winds will generate steep fresh swell resulting in hazardous seas conditions. Winds will then gradually diminish into tomorrow with locally breezy conditions over the northern outer waters. Lighter winds for mid-week before re-strengthening into the coming weekend as the next system moves through. Wind driven northwest waves continue to dominate the seas state along with lighter northwest and southerly swells.


7 Day Forecast for Marine Location Near Pleasanton, CA
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location: 37.66, -121.89     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 101849 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1149 AM PDT Mon May 10 2021

SYNOPSIS. A Red Flag Warning remains in effect through 6 pm Tuesday for the North and East Bay Hills as well as the East Bay Interior Valleys. Otherwise, expect continued sunny and warm weather through Tuesday. A cooling trend begins Wednesday and lasts through the end of the week and into next weekend as the marine layer will redevelop with onshore winds returning.

DISCUSSION. As of 10:00 AM PDT Monday . Water vapor imagery shows an inside slider digging across the Great Basin this morning, with a clear boundary extending from Cloverdale in Sonoma County through Winters and Elk Grove in the Central Valley to Strawberry in the Sierra. Extremely dry air is behind this boundary, with humidities values expected to fall into the single digits today across the North Bay Mountains and East Bay Hills. Meanwhile, current gusts are between 30 and 40 mph in these areas, with local gusts around 50 mph ongoing. Given these current conditions and the impending dry air intrusion, the Red Flag Warning looks on track for today. These offshore winds will also allow for some compressional heating today, so expect warmer conditions today for the North and East Bays.

Otherwise, just dealing with some low clouds along the coast from San Mateo County southward through Monterey County this morning. Visible imagery shows two nice Otter Eddies, one approaching the Monterey Peninsula and the another along the Big Sur Coast. A third appears to be trying to spin up along the Santa Cruz Coast, which are just fun to watch. The low clouds will help moderate temperatures along the immediate coast, but inland areas should still warm nicely. Current forecast looks on track, so no updates are planned at this time. Palmer

PREVIOUS DISCUSSION. As of 3:22 AM PDT Monday . Early morning satellite shows some low clouds developing from Half Moon Bay to Monterey along the coast as a shallow marine layer from 800-1200 feet is trying to set up along the coast. The northerly gradient is still strong, around 7 mb but down from its peak of nearly 11 mb. The SFO-WMC is about 5 mb offshore right now but forecast to increase to around 11 mb by early Tuesday morning which is low- moderate strength. For good measure the SFO-Sac is a healthy 2.5 mb onshore this morning and bringing some short term humidity relief to the inland valleys. Synoptic pattern features a thermal trough of low pressure at the surface over the Central Valley with the tightest gradient coming off of Cape Mendocino. The surface gradients will tighten later today into tonight as another shortwave trough drops into the Great Basin setting up an almost fall like offshore wind pattern. In terms of sensible weather that means a warming and drying trend today with inland highs back into the upper 80s and lower 90s. It'll be a dry heat no doubt as the next round of north winds comes down the Sac Valley today and lowers humidity into the single digits and teens across much of the North and East Bay.

Offshore winds peak tonight across the hills as gradients turn more northeast to east. Latest model solutions dont show winds too strong, mainly gusting in the 35-45 mph range but confined to the higher peaks. So no wind advisory concerns and mainly fire weather impacts. The winds will be steady all night and there will be no humidity recovery as temps stay mild in the hills.

Winds will peak between sunrise and roughly 10 am Tuesday before easing through the day. Inland areas will remain warm and dry but a shallow fog bank along the coast may send a burst of southwest winds into SF Bay by early Tuesday afternoon as some cooling returns to the coast and bays.

The amplified flow flattens and onshore winds return Tuesday night into Weds. This will bring a gradual cooling trend to all areas, most notably near the coast Weds but even inland temps will cool 5-10 degrees.

A return to more seasonable pattern then Thursday and Friday as the marine layer should be well established along the coast with night and morning low clouds intrusions while inland highs fall back into the 70s with 60s coast/bays.

Models indicate an upper trough will impact the state by next weekend but no precip expected for the Bay Area other than some drizzle associated with a deepening marine layer. Temps will trend near to below normal. As that trough ejects eastward there are some indications for more offshore winds behind it by early next week but thats a low confidence forecast at this time.

AVIATION. As of 11:49 AM PDT Monday . VFR continues across the Bay Area today. The afternoon will offer breezy northwest winds for the afternoon with 20 to 25 mph gusts possible through some of the coastal gaps. SFC winds weaken into the evening, but LLWS will become a minor concern overnight for North and East Bay terminals as winds aloft strengthen. Monterey Bay terminals will begin to see lowered ceilings overnight, falling into IFR criteria.

Vicinity of KSFO . VFR through the evening. Northwesterly winds will build into the afternoon peaking around 20 kts. Surface winds will decrease and a few low level stratus clouds will filter into the area. Skies will clear into the late morning.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR and mild winds will last through the afternoon. Coastal stratus returns in the evening and ceilings look to fall below 1000 AGL overnight. Expect IFR conditions with light winds lasting until the early morning.

FIRE WEATHER. As of 3:22 AM PDT Monday . Red Flag Warning remains in effect through 6 pm Tuesday for zones 507/510/511. Conditions are moderated at the moment but expect rapid warming and drying today as north winds filter over the region. By this afternoon inland highs into the low 90s with RH values teens and single digits inland as north winds arrive. Peak period of concern looks to be from about sunset tonight through sunrise to 10 am Tuesday. During this time northeast winds will peak with gusts generally 35-45 mph in the hills. Models indicate there will be essentially no humidity recovery overnight and in fact some places may dry as the offshore flow intensifies. The areas under the Red Flag Warning pretty much encapsulate the areas where we expect the worst combination of winds, temps, humidity and dry fuels. Will say latest model trends have backed off slightly on winds but overall pattern and state of fuels justifies the Red Flag as any nighttime ignitions would be problematic.

Winds will ease by mid morning Tuesday. Red Flag will stay in place through the hottest/driest part of the day Tuesday. This was coordinated with WFO Sacramento for a 6 pm Tuesday end time.

Onshore breezes should return by Tuesday evening with moderating conditions into Weds in terms of cooler temps, higher humidity and a general return of onshore winds.

MARINE. as of 11:46 AM PDT Monday . Moderate to locally strong northwest winds for today with gale force gusts over the northern outer waters into this afternoon. These winds will generate steep fresh swell resulting in hazardous seas conditions. Winds will then gradually diminish into tomorrow with locally breezy conditions over the northern outer waters. Lighter winds for mid- week before re-strengthening into the coming weekend as the next system moves through. Wind driven northwest waves continue to dominate the seas state along with lighter northwest and southerly swells.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. Red Flag Warning . CAZ507-510-511 SCA . Pigeon Pt to Pt Pinos 0-10 nm from 3 PM GLW . Pt Arena to Pigeon Pt 10-60 nm until 3 PM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . Pt Arena to Pt Reyes 0-10 nm



PUBLIC FORECAST: Palmer/RWW AVIATION: Murdock 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 20 mi68 min WNW 1 G 7 77°F 1012.6 hPa (-0.8)
AAMC1 - 9414750 - Alameda, CA 23 mi68 min W 4.1 G 5.1 71°F 67°F1012.4 hPa (-0.6)
LNDC1 23 mi68 min NW 2.9 G 7 74°F 1012 hPa (-0.6)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 25 mi68 min W 4.1 G 5.1
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 26 mi68 min NNE 18 G 21 82°F 1010.9 hPa (-0.8)
OBXC1 26 mi68 min 65°F 53°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 26 mi68 min WNW 5.1 G 7 64°F 1012.2 hPa (-0.5)
PCOC1 - 9415144 - Port Chicago, CA 28 mi68 min W 7 G 8 79°F 68°F1011.2 hPa (-0.7)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 28 mi68 min S 1.9 G 5.1 64°F 1011.3 hPa (-0.5)
PXSC1 29 mi68 min 73°F 67°F
UPBC1 29 mi68 min W 5.1 G 7
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi68 min W 5.1 G 7 77°F 65°F1011.6 hPa (-0.7)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 30 mi68 min SSE 2.9 G 4.1 67°F 1012.7 hPa (-0.4)
FTPC1 - 9414290 - San Francisco, CA 32 mi68 min WSW 14 G 19 57°F 57°F1012.6 hPa (+0.0)
RCMC1 - 9414863 - Richmond, CA 33 mi68 min S 1.9 G 2.9 67°F 61°F1012.2 hPa (-0.5)
CQUC1 33 mi85 min 66°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 34 mi68 min WSW 4.1 G 6 69°F 1011.6 hPa (-0.5)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 34 mi87 min N 2.9 74°F 1012 hPa
SFXC1 - San Francisco Bay Reserve, CA 38 mi83 min NNE 13 89°F 1012 hPa
46237 - San Francisco Bar, CA (142) 40 mi68 min 55°F6 ft

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Livermore, Livermore Municipal Airport, CA5 mi75 minN 12 G 1910.00 miFair87°F27°F11%1010.9 hPa
Hayward, Hayward Air Terminal, CA12 mi74 minWNW 1010.00 miFair79°F43°F28%1012.6 hPa
Palo Alto Airport, CA17 mi81 minNNW 1110.00 miClear81°F48°F32%1011.8 hPa
Oakland, Metro Oakland International Airport, CA18 mi75 minW 710.00 miFair75°F50°F42%1012 hPa
San Jose, San Jose International Airport, CA20 mi75 minNNW 1110.00 miFair80°F45°F29%1011.2 hPa
San Carlos Airport, CA21 mi81 minNW 510.00 miClear81°F39°F23%1012.2 hPa
San Jose / Reid / Hillv, CA22 mi81 minWNW 610.00 miClear81°F46°F30%1011.8 hPa
Concord, Buchanan Field, CA24 mi75 minVar 6 G 1810.00 miFair87°F39°F18%1009.9 hPa

Link to 5 minute data for KLVK

Wind History from LVK (wind in knots)
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Last 24hrW12W14W16W12W8W5NW6NW6NW4W6W6CalmCalmCalmCalmCalmE4Calm4S5N7N8N12
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2 days agoW9W12W11W10W11W6S3NW5W4N3NE3CalmCalmN3Calm3CalmNW33NE14
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Tide / Current Tables for Alameda Creek, San Francisco Bay, California
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Alameda Creek
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Mon -- 12:11 AM PDT     5.90 feet High Tide
Mon -- 05:41 AM PDT     Moonrise
Mon -- 06:03 AM PDT     Sunrise
Mon -- 08:08 AM PDT     -0.01 feet Low Tide
Mon -- 01:22 PM PDT     4.58 feet High Tide
Mon -- 07:19 PM PDT     Moonset
Mon -- 07:45 PM PDT     0.50 feet Low Tide
Mon -- 08:07 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.95.85.24.33.11.90.90.2-00.31.32.63.84.54.53.93.12.11.20.60.51.32.94.5

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
Mon -- 12:36 AM PDT     -0.01 knots Slack
Mon -- 05:07 AM PDT     -1.27 knots Max Ebb
Mon -- 05:40 AM PDT     Moonrise
Mon -- 06:03 AM PDT     Sunrise
Mon -- 07:44 AM PDT     0.00 knots Slack
Mon -- 10:28 AM PDT     1.42 knots Max Flood
Mon -- 01:35 PM PDT     -0.00 knots Slack
Mon -- 05:30 PM PDT     -0.82 knots Max Ebb
Mon -- 07:19 PM PDT     Moonset
Mon -- 07:41 PM PDT     0.01 knots Slack
Mon -- 08:06 PM PDT     Sunset
Mon -- 10:11 PM PDT     1.13 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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