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Marine Weather and Tides Hercules, 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.

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Sunrise 6:20AM

Sunset 8:08PM

Tuesday August 11, 2020 12:38 PM PDT (19:38 UTC)

Moonrise 11:31PM

Moonset 12:54PM

Illumination 46%

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.

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7 Day Forecast for Marine Location Near Hercules, CA

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Area Discussion for - San Francisco/Monterey Bay Area, CA

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FXUS66 KMTR 111743 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1043 AM PDT Tue Aug 11 2020

SYNOPSIS. A slight cooling trend will continue today, especially across the interior. Meanwhile, little change is anticipated near the coast with the typical ebb and flow of low clouds each night/morning. A warming trend is forecast to begin on Wednesday and continue through the end of the week and into the weekend.

DISCUSSION. as of 08:56 AM PDT Tuesday . Solid push of stratus across much of the inland valleys this morning. This forecaster had to run the wipers this morning on the way into the office. A quick look at automated gages also show a few buckets tips near Pt Reyes and some of the hills. Given solid marine layer push and decent onshore flow, dissipation of the low clouds will be slow in the morning. Therefore, today will be a few degrees cooler than Monday. No update this morning.

Weather topics for the afternoon forecast package will be fine tuning potential heat Thursday into the weekend and any convection concerns as tropical moisture drifts northward.

PREV DISCUSSION. As of 2:00 AM PDT Tuesday . Coastal profilers at both Bodega Bay and Fort Ord indicate a slight deepening of the marine layer over the past 24 hours. In addition, onshore surface pressure gradients have increased. These developments are in response to an upper trough settling into the Pacific Northwest and weakening the ridge over California a bit. This process will continue today and result in another 3 to 7 degrees of cooling, with most cooling expected across the interior.

As the upper trough to our north shifts to the east on Wednesday, surface high pressure will build off the northern California coast, resulting in a return to more typical northwesterly surface winds by Wednesday afternoon. These northwest winds may increase sufficiently by afternoon to sweep low clouds away from the coast north of the Golden Gate by late in the day. In addition, increasing north-to-south surface pressure gradients will limit onshore flow to some extent on Wednesday, which will result in the start of a warming trend for much of our area.

The warming trend is then expected to continue through the remainder of the week and into the upcoming weekend as an upper ridge over the Desert Southwest gradually expands west and northward across California. High temperatures in our warmest interior valleys will climb to around 100 by Friday, with additional warming possible over the weekend. Surface flow is forecast to remain onshore and thus coastal areas will experience less robust warming. But the marine layer will likely compress to a depth of less than 1000 feet by late in the week, allowing temperatures to warm into the 80s not all that far from the coast, while 90s will be common in the coastal valleys and hills by late in the week. Heat Risk is currently projected to remain mostly in the moderate category, but scattered areas of high Heat Risk are projected in the interior valleys and hills by Friday and on into the weekend.

Remnant moisture from Hurricane Elida is forecast to be drawn northward around the western periphery of the Desert Southwest high and across the southern portion of our forecast area by late Thursday and Thursday night. This moisture plume is then forecast to lift northward across much of the rest of our forecast area by early in the weekend. Additional moisture from a second tropical system may then arrive over our area by early next week. Models do not generate precipitation over our area from this moisture, and the model blend currently keeps thunderstorm chances at less than 10 percent. In any case, this moisture and any possible mid-level instability will need to be monitored closely due to the potential for significant impacts if dry lightning were to develop.

AVIATION. as of 10:40 AM PDT Tuesday . A deepening marine layer and increased onshore flow in the lower levels resulted further inland penetration of stratus this morning. Additionally, clearing has been slower to occur at coastal and North Bay terminals. Surface winds will increase and any remaining clouds will dissipate through the remainder of the morning with breezy W/NW winds into the afternoon and early evening. Persistent pattern is likely through Wednesday morning with low clouds spreading back inland overnight along with diminishing wind speeds.

Vicinity of KSFO . VFR. W/NW winds increasing to 12-15 kt this afternoon. Winds speeds diminish slightly overnight with increased confidence of MVFR/IFR ceilings developing around 12Z Wednesday.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . MVFR/IFR ceilings lingering over the terminals this morning yet should dissipate for a few hours this afternoon along with an increase W/NW winds. Winds again diminish this evening with high confidence of an early return of IFR/LIFR ceilings overnight.

MARINE. as of 10:40 AM PDT Tuesday . A 1028 mb high centered 1200 miles west of Cape Blanco will move slowly closer to the West Coast through late week while weakening as a low pressure system develops in the Gulf of Alaska. Northwest winds will increase today through Thursday before decreasing on Friday. Mixed seas will continue through the period with a short period northwest swell and a longer period southerly swell. Southerly swell will increase Tuesday and Wednesday.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . SF Bay from 2 PM



PUBLIC FORECAST: MM/Dykema AVIATION: RGass MARINE: RGass

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA	3 mi	51 min	SW 12 G 16	63°F			1014 hPa
UPBC1	9 mi	51 min	W 16 G 22
RCMC1 - 9414863 - Richmond, CA	9 mi	51 min			65°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA	9 mi	51 min	SW 8 G 11	61°F			1015.3 hPa
MZXC1 - 9415102 - Martinez-Amorco CA	9 mi	51 min	WSW 15 G 19	64°F	69°F		1013.9 hPa
PCOC1 - 9415144 - Port Chicago, CA	14 mi	51 min	W 20 G 24	65°F	70°F		1013.2 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA	15 mi	51 min	W 8 G 11	62°F			1014.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA	15 mi	51 min	W 9.9 G 11
OBXC1	15 mi	51 min		62°F				61°F
LNDC1	16 mi	51 min	W 6 G 11	63°F			1014.8 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA	16 mi	51 min	W 8 G 11	63°F			1013.9 hPa
PXSC1	16 mi	51 min		63°F				60°F
FTPC1 - 9414290 - San Francisco, CA	17 mi	51 min			63°F
AAMC1 - 9414750 - Alameda, CA	17 mi	51 min			69°F
SFXC1 - San Francisco Bay Reserve, CA	19 mi	114 min	W 15
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA	21 mi	51 min	NW 18 G 23	67°F			1012.6 hPa
46237 - San Francisco Bar, CA (142)	24 mi	69 min			59°F	4 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA	34 mi	39 min	SSE 7.8 G 12	56°F	57°F		1015.5 hPa (+0.8)	56°F
RTYC1 - 9414523 - Redwood City, CA	36 mi	51 min	NW 8.9 G 11	68°F	75°F		1014.7 hPa

Wind History for Point Potrero Richmond, CA

(wind in knots)    EDIT      (on/off)   Help

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-12 PM

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Last 24hr

S13 G18

SW14 G18

SW13 G17

S12 G18

SW11 G16

SW11 G14

SW9 G15

SW8 G15

SW9

SW6 G9

SW7 G10

SW11 G17

SW9 G12

SW10 G13

SW6 G10

SW8 G11

SW11 G15

SW9 G14

SW9 G12

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SW11 G14

SW9 G14

1 day ago

SW12 G16

SW15 G22

S16 G21

SW11 G14

SW11 G16

SW14 G19

S14 G17

S18

SW5 G9

SW7 G10

SW9 G15

SW14 G18

S18

SW17 G22

SW10 G16

S9 G13

SW10 G15

SW9 G13

SW10 G15

SW6

SW5 G8

S14 G18

S16

S14 G19

2 days ago

SW11 G15

SW11 G15

SW5 G11

SW11 G15

SW9 G12

S10 G13

S8 G11

S9

S10 G16

SW7 G12

SW9

S13 G17

SW12 G16

SW11 G15

SW11 G15

SW7 G10

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S4

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S5

S3

S8 G11

SW11 G14

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Concord, Buchanan Field, CA	13 mi	46 min	W 13	10.00 mi	Fair	74°F	55°F	52%	1012 hPa
Napa, Napa County Airport, CA	13 mi	45 min	SSW 12	10.00 mi	A Few Clouds	69°F	57°F	68%	1013.1 hPa
Novato / Gnoss Field, CA	16 mi	44 min	Var 7 G 13	10.00 mi	Fair	73°F	57°F	57%	1014.2 hPa
Oakland, Metro Oakland International Airport, CA	22 mi	46 min	NW 13	10.00 mi	A Few Clouds	71°F	57°F	61%	1014.6 hPa
Petaluma Municipal Airport, CA	23 mi	44 min	NW 7	10.00 mi	Overcast	68°F	60°F	78%	1014.9 hPa

Link to 5 minute data for KCCR

Wind History from CCR (wind in knots)

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Last 24hr

NW13

W10

W11 G20

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1 day ago

NW8

N8

NW12

SW12 G17

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W5

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Calm

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Calm

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2 days ago

NW9

NW13

W10

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W11

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W5

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NW4

Calm

NW3

Calm

5

3

N8

NW8

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Tide / Current Tables for Hercules, Refugio Landing, San Pablo Bay, California

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Tide / Current Tables for Davis Point, California Current

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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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East

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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 Sacramento, CA

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