Tuesday, July27, 2021
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Marine Weather and Tides
Isleton, CA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
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 6:03AMSunset 8:22PM Monday July 26, 2021 11:54 PM PDT (06:54 UTC) Moonrise 9:32PMMoonset 7:46AM Illumination 91% Phase: Waning Gibbous; Moon at 18 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- 900 Pm Pdt Mon Jul 26 2021
.small craft advisory in effect from Tuesday afternoon through Tuesday evening...
Tonight..SW winds 15 to 20 kt, diminishing to 5 to 10 kt after midnight. Gusts up to 30 kt. A slight chance of showers and Thunderstorms.
Tue..SW winds 15 to 20 kt with gusts up to 25 kt. A slight chance of showers and Thunderstorms.
Tue night..SW winds 15 to 20 kt with gusts up to 30 kt.
Wed..SW winds 5 to 10 kt with gusts up to 30 kt.
Wed night..SW winds 5 to 10 kt with gusts up to 30 kt.
Thu..SW winds 5 to 10 kt with gusts up to 30 kt.
Thu night..SW winds 5 to 10 kt.
Fri..SW winds 10 to 15 kt.
Sat..SW winds 10 to 15 kt. Winds and wind waves higher in and near Thunderstorms.
PZZ500 900 Pm Pdt Mon Jul 26 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light to locally breezy northwest winds continue to drive the sea state at around 8 to 9 seconds along with a weak southerly swell. Wind gusts will increase Tuesday afternoon and into the evening through the golden gate gap into the san francisco bay. Locally generated steep wind waves may be hazardous for smaller vessels. Slight chance of showers and high based Thunderstorms remains over the waters through Tuesday morning. Any developing Thunderstorms may be accompanied by lightning and erratic winds. Chances for Thunderstorms diminish Tuesday afternoon.


7 Day Forecast for Marine Location Near Isleton, CA
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location: 38.13, -121.58     debug


Area Discussion for - Sacramento, CA
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FXUS66 KSTO 270540 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 1040 PM PDT Mon Jul 26 2021

SYNOPSIS. Widespread sprinkles, or light showers, possible through Tuesday. Mainly late day thunderstorm chances expected over the Sierra Nevada through the week. Cooler temperatures early this week before warming to above average again by mid-week.

DISCUSSION. The Evening Update: Appears this evening's CAMs have picked up on the decaying MCS over/near the Sierra Crest in our Tuolumne and Alpine Counties at press time that will spread mainly light showers or sprinkles over our CWA tonight and then working up to the north during the day on Tue. Folks in the Valley should not be surprised if they "smell rain" or experience some sprinkles/light showers. Looks as if the shower threat will end by around 1800 Tue (6 pm). Still does not appear there will be enough elevated instability for thunder. In fact the strongest forecast REF from the NAM 3km is forecast N of SAC early Tue morning with a dBZ in the low 30s which usually means a noticeable light shower.

The cloud tops of the MCS are warming quite rapidly so the thunder threat is most likely to remain over the higher elevations of the Sierra mainly S of Tahoe/Hwy 50. Chances are low that thunder will occur at the lower elevations of our CWA. In fact the HREF has about an 11% chance of Prob of REFL > 40 dBZ in the aforementioned area just N of SAC. The 20 pct probabilities are all outside of our CWA thru Tue.

As mentioned last nite, the cloud cover did a number on the max temps today, and the cloud cover will linger through most of the day up N, but will gradually erode/thin by the middle of the day over the Srn portion of the CWA where more solar insolation will warm it up into the mid 90s or so. Marine layer has already lowered slightly from yesterday and KSUU seems to have lost some onshore momentum already, so the warming in the Srn half of the Valley looks definite.

Next chance of thunder in our CWA should be over the Sierra again Wed afternoon. JHM

Previous Discussion. Monsoon moisture continues to build north into NorCal around a strong upper level ridge set up over the central part of the country. PWATs have pushed into the 0.60 to 1.10" range across the area and we will continue to see them increase overnight with them maxing out over an inch tomorrow morning into the afternoon. The building moisture has brought quite a bit of cloud cover today and even a few sprinkles across the region. Overall instability is limited over our area this afternoon but there is some along the and east of the Sierra Crest and that is where some more intense showers have developed along with some isolated thunderstorms. This trend will continue mainly along the Sierra crest from around I-80 south into the early evening.

The main feature we are keeping an eye on is a short wave trough currently in SoCal that is spinning around the ridge. This short wave trough will continue to track north into the overnight and tomorrow and will be accompanied by the higher moisture values. This will bring light shower chance to the entire area later tonight and will continue into tomorrow. The best chances will be over the higher elevations. Upper level instability will be limited and should keep activity mainly as showers. Some weak instability will begin to build in during the afternoon but even that looks to be limited given the cloud cover we will see with this. Overall the showers are not going to produce much rain given the amount of dry air under the mid-level moisture but a brief downpour can't be ruled out mainly over the higher elevations. The cloud cover will hold daytime highs down tomorrow with them running near average in southern areas to as much as 15 degrees below average in northern areas. The forcing will push north by tomorrow night with dry conditions setting back in and clearing skies.

The upper level ridge will slowly push east Wednesday into the end of the week which will bring a warming trend to the region and we will see highs push back into the triple digits across the Valley. A trough off the coast of CA will cut off the Delta flow also which will limit cooling in the Delta and Sacramento area. Widespread moderate heat risk is expected by Thursday. Monsoon moisture will remain in place but we will see a lack of forcing. This will keep thunderstorm chances to the Sierra during the afternoon and early evening mainly from about I-80 south. Gusty erratic winds and brief downpours will be possible with any thunderstorms we see this week.

-CJM

EXTENDED DISCUSSION (Friday THROUGH Monday). Interior NorCal remains situated between ridging over the Rockies and troughing over the Eastern Pacific through the extended. This should bring above normal temperatures that gradually cool towards the end of the period. Monsoonal moisture surge could cause a few thunderstorms to develop along the Sierra crest, mainly south of I-80.

AVIATION. VFR conditions at TAF sites next 24 hours. Local MVFR to IFR conditions in wildfire smoke, mainly over Plumas County. Isolated to scattered thunderstorms possible over the mountains. Scattered -SHRA developing over the foothills this evening then ISOLD to Scattered -SHRA over the Vly after 07Z. Local southerly wind gusts up to 20 kts from KSAC northward. Local southwesterly surface wind gusts 25-35 kts vicinity west Delta.

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 17 mi61 min NW 13 G 19 62°F 1013.3 hPa
SFXC1 - San Francisco Bay Reserve, CA 24 mi70 min W 8 61°F 1015 hPa54°F
PCOC1 - 9415144 - Port Chicago, CA 25 mi61 min W 14 G 16 61°F 68°F1014.2 hPa
UPBC1 29 mi61 min WNW 13 G 16
MZXC1 - 9415102 - Martinez-Amorco CA 30 mi61 min WNW 11 G 14 60°F 67°F1014.5 hPa
CQUC1 35 mi72 min 67°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 37 mi61 min SW 8 G 9.9 59°F 1014.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 44 mi61 min SW 7 G 8.9 59°F 1015.3 hPa
LNDC1 44 mi61 min NNE 5.1 G 7 59°F 1014.7 hPa
AAMC1 - 9414750 - Alameda, CA 45 mi61 min NNE 1.9 G 5.1 60°F 68°F1015.1 hPa
OBXC1 46 mi73 min 59°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 46 mi61 min NW 6 G 7 59°F 1014.7 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 46 mi61 min N 1.9 G 2.9
RCMC1 - 9414863 - Richmond, CA 46 mi61 min WSW 4.1 G 6 58°F 63°F1015 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 49 mi61 min W 4.1 G 5.1 58°F 1013.9 hPa
PXSC1 49 mi61 min 59°F 59°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 49 mi74 min SSE 7 56°F 1015 hPa

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fairfield / Travis Air Force Base, CA21 mi59 minWSW 1210.00 miOvercast63°F53°F68%1014.2 hPa
Stockton, Stockton Metropolitan Airport, CA23 mi60 minNW 710.00 miFair72°F49°F44%1013 hPa

Link to 5 minute data for KSUU

Wind History from SUU (wind in knots)
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Tide / Current Tables for Georgiana Slough entrance, Mokelumne River, California
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Georgiana Slough entrance
Click for Map
Tue -- 02:43 AM PDT     1.07 feet Low Tide
Tue -- 06:05 AM PDT     Sunrise
Tue -- 07:55 AM PDT     3.34 feet High Tide
Tue -- 09:51 AM PDT     Moonset
Tue -- 03:27 PM PDT     -0.13 feet Low Tide
Tue -- 08:19 PM PDT     Sunset
Tue -- 09:46 PM PDT     3.05 feet High Tide
Tue -- 10:59 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.91.51.11.11.422.73.23.33.22.72.11.30.70.2-0.1-0.10.41.11.92.52.932.8

Tide / Current Tables for West Island Lt .5 mi SE, San Joaquin River, California Current
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West Island Lt .5 mi SE
Click for Map
Tue -- 02:24 AM PDT     0.00 knots Slack
Tue -- 05:12 AM PDT     0.42 knots Max Flood
Tue -- 06:06 AM PDT     Sunrise
Tue -- 07:56 AM PDT     -0.00 knots Slack
Tue -- 09:52 AM PDT     Moonset
Tue -- 11:43 AM PDT     -0.91 knots Max Ebb
Tue -- 03:34 PM PDT     0.00 knots Slack
Tue -- 06:44 PM PDT     0.42 knots Max Flood
Tue -- 08:20 PM PDT     Sunset
Tue -- 09:47 PM PDT     -0.00 knots Slack
Tue -- 10:59 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.4-0.4-0.10.10.30.40.40.2-0-0.4-0.7-0.9-0.9-0.8-0.6-0.20.10.30.40.40.30.2-0.1-0.3

Weather Map
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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.
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