Monday, April19, 2021
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Marine Weather and Tides
August, 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 6:21AMSunset 7:46PM Monday April 19, 2021 3:59 PM PDT (22:59 UTC) Moonrise 10:35AMMoonset 1:04AM Illumination 55% Phase: First Quarter Moon; Moon at 8 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 200 Pm Pdt Mon Apr 19 2021
Tonight..SW winds 5 to 15 kt with gusts up to 25 kt.
Tue..SW winds 5 to 15 kt.
Tue night..SW winds 5 to 15 kt.
Wed..SW winds 10 to 20 kt with gusts up to 25 kt.
Wed night..SW winds 10 to 20 kt with gusts up to 25 kt.
Thu..SW winds 10 to 20 kt with gusts up to 30 kt.
Thu night..SW winds 5 to 15 kt.
Fri..SW winds 5 to 15 kt.
Sat..SW winds 5 to 15 kt. A chance of rain.
PZZ500 200 Pm Pdt Mon Apr 19 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Buoy observations show moderately gusty northwest winds, with near gale force gusts in the coastal waters south of point sur. Gale force gusts are expected to develop over the northern waters this evening. Gusty winds will persist through Tuesday evening. These winds will produce steep wind waves resulting in hazardous seas conditions, particularly for smaller vessels. Moderate northwest swell through the period along with a lighter longer period southerly swell.


7 Day Forecast for Marine Location Near August, CA
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location: 37.95, -121.28     debug


Area Discussion for - Sacramento, CA
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FXUS66 KSTO 192129 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 229 PM PDT Mon Apr 19 2021

SYNOPSIS. Dry and unseasonably warm again today. Cooler Tuesday with the chance of mainly mountain showers and thunderstorms. A few showers possible Wednesday in the Sierra south of Tahoe. Otherwise dry and warmer weather returns through the end of the week. Chance of precipitation returns this weekend.

DISCUSSION. High pressure is beginning to break down today over Northern California due to a trough moving through the central US. However, pressure will remain high enough for another day of well above normal daytime temperatures for most of the CWA. Early afternoon temperatures are a few degrees cooler to this time yesterday for most Valley locations due to a modest onshore flow. The winner though is Travis Air Force Base at 18 degrees cooler then yesterday with an observation of only 69 degrees. Overall, Valley temperatures are still forecast to peak in the mid to upper 80s which is still 10 to 20 degrees above the daily normal.

Ensemble guidance continues to bring a trough through the area tomorrow, slowly moving to our southeast through Wednesday. This will bring cooler temperatures (upper 70s to low 80s in the Valley) as well as a chance of isolated showers and thunderstorms tomorrow, mainly to the mountains and foothills including the Sierra Nevada, southern Cascades, and Coastal Range. However, latest guidance continues to show the trough oriented a bit more to the west than previous runs. This combined with sufficient forecast CAPE values of 200-800 J/kg and PWATS > 0.5 inch could produce a few isolated showers or thunderstorms moving off of the mountains and into the Sacramento Valley. The main threats with any thunderstorm are small hail, brief heavy rainfall, gusty winds, and lightning. Although, HREF is indicating the potential for above 0.5 inch of rain in one hour over the Sierra foothills with stronger cells, signal remains that amounts should remain below 1 inch per hour, so no debris flow impacts are expected to burn scars.

Shower and thunderstorm chances continue for Wednesday, mainly for mountain areas along and south of I-80. Ensembles still uncertain about exact location of the trough to our southeast on Wednesday, so confidence in thunderstorms is lower.

Gusty north winds will also accompany the trough tomorrow and Wednesday for the northern Sacramento Valley. Strongest gusts are expected tomorrow with gusts up to 25 to 35 mph. Locally breezy downslope winds pick up overnight tomorrow night in the Sierra before gusty winds return to the northern Sacramento Valley again Wednesday. Conditions remain extremely dry in this region of the Valley with minimum daytime RH values forecast in the single digits and teens. This combined with gusty winds could create locally elevated fire weather concerns through Wednesday. It is recommended to avoid outdoor activities that could create sparks.

Ridging returns behind the trough passage bringing dry weather and warmer temperatures. Valley highs are forecast for the mid to upper 80s Wednesday and Thursday. -HEC

EXTENDED DISCUSSION (Friday THROUGH Monday). Long range forecast has little change. Upper level ridging returns for Thursday and Friday which will bring the return of warm and dry weather to the region. A pattern change still looks likely for the weekend and into early next week, as ensemble guidance alludes to a trough moving towards the region. The deterministic models are still in agreement, though there is still quite a bit of uncertainty this far out. Will continue to advertise cooler and more seasonal weather and some POP over interior NorCal.

AVIATION. VFR conditions next 24 hours, except for local MVFR conditions possible vicinity showers and isolated thunderstorms mainly over the mountains after 12Z- 18Z Tuesday. Local northerly wind gusts 20-30 kts develop over the northern Sacramento Valley by 16Z-18Z Tuesday. Local southwest wind gusts to 25 kts vicinity Delta tonight.

STO WATCHES/WARNINGS/ADVISORIES. None.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi60 min NW 12 G 16 73°F 1015.9 hPa (-2.1)
PCOC1 - 9415144 - Port Chicago, CA 41 mi60 min W 13 G 16 71°F 62°F1016.6 hPa (-2.1)
SFXC1 - San Francisco Bay Reserve, CA 43 mi75 min W 13 75°F 1017 hPa50°F
MZXC1 - 9415102 - Martinez-Amorco CA 45 mi60 min W 9.9 G 11 69°F 62°F1016.9 hPa (-2.2)
UPBC1 45 mi60 min W 12 G 14
AAMC1 - 9414750 - Alameda, CA 55 mi60 min WSW 7 G 9.9 56°F 63°F1019.2 hPa (-1.9)

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Stockton, Stockton Metropolitan Airport, CA3 mi65 minNW 11 G 1610.00 miFair82°F45°F27%1015.6 hPa

Link to 5 minute data for KSCK

Wind History from SCK (wind in knots)
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Tide / Current Tables for Blackslough Landing, San Joaquin River, California
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Blackslough Landing
Click for Map
Mon -- 01:21 AM PDT     2.56 feet High Tide
Mon -- 02:05 AM PDT     Moonset
Mon -- 05:39 AM PDT     1.50 feet Low Tide
Mon -- 06:24 AM PDT     Sunrise
Mon -- 10:35 AM PDT     3.28 feet High Tide
Mon -- 11:35 AM PDT     Moonrise
Mon -- 07:24 PM PDT     0.13 feet Low Tide
Mon -- 07:45 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.32.52.52.21.81.51.51.72.22.83.23.332.62.11.50.90.50.30.10.20.40.91.5

Tide / Current Tables for Vulcan Island .5 mi E, San Joaquin River, California Current
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Vulcan Island .5 mi E
Click for Map
Mon -- 02:04 AM PDT     Moonset
Mon -- 02:45 AM PDT     -0.00 knots Slack
Mon -- 04:37 AM PDT     -0.14 knots Max Ebb
Mon -- 06:24 AM PDT     Sunrise
Mon -- 06:45 AM PDT     0.00 knots Slack
Mon -- 09:20 AM PDT     0.45 knots Max Flood
Mon -- 11:35 AM PDT     Moonrise
Mon -- 12:10 PM PDT     -0.00 knots Slack
Mon -- 03:41 PM PDT     -0.55 knots Max Ebb
Mon -- 07:45 PM PDT     Sunset
Mon -- 08:26 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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0.50.30.1-0-0.1-0.1-0.10.10.30.40.40.30-0.2-0.4-0.5-0.5-0.5-0.4-0.3-0.10.20.40.5

Weather Map
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wmap_P
GEOS Local Image of CentralWestCoast    EDIT
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.
Link to Loop

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