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Marine Weather and Tides Livermore, 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 6:12AM

Sunset 8:13PM

Tuesday August 4, 2020 7:48 AM PDT (14:48 UTC)

Moonrise 8:18PM

Moonset 6:04AM

Illumination 100%

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 Livermore, CA

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

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FXUS66 KMTR 041134 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 434 AM PDT Tue Aug 4 2020

SYNOPSIS. A significant cooling trend is forecast today and Wednesday as an upper trough deepens over California. Patchy drizzle or light rain is likely at times through Wednesday, mainly near the coast and in the coastal hills, with the highest likelihood of measurable precipitation tonight and Wednesday morning. In addition, breezy conditions are forecast through Wednesday, with locally gusty west to northwest winds expected during the afternoon and evening hours. Modest warming is forecast late in the week and into the weekend, but temperatures will only bounce back to near seasonal averages.

DISCUSSION. As of 3:40 AM PDT Tuesday . Low clouds rapidly redeveloped near the ocean last evening and have been been spreading inland overnight as both the marine layer depth and onshore flow increase in response to an upper trough deepening just off the California coast. The trough is forecast to continue deepening through Wednesday. The primary impacts today and Wednesday will be much cooler temperatures, breezy to locally gusty onshore winds, and damp conditions as the deepening marine layer generates patchy drizzle or light rain near the coast and in the coastal hills.

Measurable precipitation has already occurred overnight in scattered coastal areas from Sonoma County south to San Mateo County, as well as an isolated location in the East Bay Hills. Most locations have only picked up a few hundredths, but nearly a tenth of an inch has accumulated in Montara on the San Mateo County Coast. The low resolution models such as the GFS are, as usual, mostly missing the marine layer precipitation and forecast little or no measurable rainfall over the next couple of days. The NAM is almost certainly forecasting unrealistically high amounts, by generating up to an inch of rain along the Big Sur Coast by late Wednesday. The local WRF model appears most reasonable, both in terms of location and amounts of precipitation. The WRF forecasts up to a third of an inch in western San Mateo County by late Wednesday, and generally a tenth of an inch or less elsewhere near the coast and in the coastal hills. Also, most of this precipitation is expected to fall tonight and Wednesday morning when moist low level flow will be at its maximum.

The combination of increased cloud cover, stronger onshore flow, and a cooler airmass aloft with the upper trough will result in significantly cooler temperatures today and Wednesday, especially inland. Highs today are forecast to be anywhere from 7 to 15 degrees cooler than Monday. Up to an additional 10 degrees of cooling is expected for the inland valleys on Wednesday. By Wednesday, high temperatures are forecast to be anywhere from 5 to 12 degrees cooler than normal.

Steep onshore surface pressure gradients over the next few days will mean breezy conditions, and locally gusty westerly winds are likely, especially through gaps in the terrain such as Altamont Pass in the East Bay, the San Bruno and Crystal Springs gaps in San Mateo County, and other areas where onshore winds are enhanced. Gusts in these areas are expected to be in the range of 30 to 40 mph, especially during the late afternoon and evening hours, and local gusts up to 50 mph are likely.

The upper trough is forecast to lift to the northeast on Thursday and Thursday night. This will result in a gradual warming trend from Thursday into the upcoming weekend. However, models maintain weak upper level troughing and so temperatures are only expected to warm back to around seasonal averages.

AVIATION. As of 4:34 AM PDT Tuesday . For 12z tafs. The marine layer depth is 1,000 to 1,400 feet per recent profiler data. VLIFR- IFR continues to move inland on onshore winds. Expect lowering vsbys and cloud ceilings due to stratus, fog and coastal drizzle. Partial clearing developing in the afternoon otherwise VLIFR-IFR tonight and Wednesday morning.

Vicinity of KSFO . IFR continuing to late morning then clearing. Onshore winds gusty in the afternoon though probably a bit less strong than those on Monday.

SFO Bridge Approach . Similar to SFO.

Monterey Bay Terminals . VLIFR-IFR ceilings continuing to late morning then clearing. VLIFR-IFR tonight and Wednesday morning. Onshore winds through the period occasionally to 15 knots in the afternoon.

MARINE. As of 2:13 AM PDT Tuesday . Moderately strong and gusty northwesterly winds will continue into the latter part of the week over much of the coastal waters as high pressure remains over the eastern Pacific. The strongest winds will be along the immediate coastline south of Point Sur and north of Point Reyes. Breezy onshore winds are also expected in the afternoons and evenings over the bays. These winds will generate steep fresh swells resulting in locally hazardous seas, especially for smaller vessels.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . SF Bay from 2 PM SCA . Mry Bay from 2 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm from 2 PM SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . Pt Reyes to Pigeon Pt 0-10 nm



PUBLIC FORECAST: Dykema AVIATION: Canepa MARINE: Blier

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
RTYC1 - 9414523 - Redwood City, CA	30 mi	54 min	WNW 4.1 G 5.1	60°F	74°F		1015.6 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA	33 mi	54 min	WNW 7 G 9.9	65°F			1012.8 hPa
AAMC1 - 9414750 - Alameda, CA	36 mi	54 min	WSW 8.9 G 13	57°F	69°F		1015.2 hPa
LNDC1	36 mi	54 min	SW 7 G 9.9	57°F			1015 hPa
PCOC1 - 9415144 - Port Chicago, CA	37 mi	54 min	SW 8.9 G 14	59°F	68°F		1013.5 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA	38 mi	54 min	S 9.9 G 13
UPBC1	39 mi	54 min	WNW 6 G 9.9
OKXC1 - 9414776 - Oakland (Berth 34), CA	39 mi	54 min	SSW 7 G 9.9	56°F			1015 hPa
OBXC1	39 mi	54 min		57°F				57°F
MZXC1 - 9415102 - Martinez-Amorco CA	39 mi	54 min	WNW 8.9 G 9.9	61°F	68°F		1013.9 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA	41 mi	54 min	SE 5.1 G 8.9	56°F			1013.8 hPa
PXSC1	42 mi	54 min		57°F				57°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA	43 mi	54 min	S 12 G 15	58°F			1015 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA	45 mi	54 min	WSW 8 G 11	60°F			1013.9 hPa
FTPC1 - 9414290 - San Francisco, CA	45 mi	54 min	S 5.1 G 7	55°F	62°F		1014.8 hPa
RCMC1 - 9414863 - Richmond, CA	46 mi	54 min	SSE 12 G 14	57°F	65°F		1014.5 hPa
SFXC1 - San Francisco Bay Reserve, CA	46 mi	63 min	W 8
TIBC1 - Tiburon Pier, San Francisco Bay, CA	46 mi	44 min	SE 4.1	58°F			1015 hPa

Wind History for Redwood City, CA

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Livermore, Livermore Municipal Airport, CA	11 mi	55 min	N 0	10.00 mi	Fair	59°F	55°F	87%	1014.3 hPa
San Jose / Reid / Hillv, CA	20 mi	61 min	N 0	10.00 mi	Clear	59°F	53°F	82%	1015.2 hPa
San Jose, San Jose International Airport, CA	21 mi	55 min	S 4	10.00 mi	A Few Clouds	60°F	54°F	80%	1014.9 hPa
Mountain View, Moffett Field, CA	24 mi	53 min	N 0	10.00 mi		61°F	57°F	88%	1015.2 hPa

Link to 5 minute data for KLVK

Wind History from LVK (wind in knots)

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Tide / Current Tables for Grant Line Canal (drawbridge), Old River, California

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Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, 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 (10,2,3,4)

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Ground Weather Radar Station San Francisco Bay Area, CA

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