Wednesday, August21, 2019 L-36.com


Marine Weather and Tides
Milpitas, CA

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:27AMSunset 7:53PM Wednesday August 21, 2019 4:47 AM PDT (11:47 UTC) Moonrise 10:20PMMoonset 11:03AM Illumination 67% Phase: Waning Gibbous; Moon at 21 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- 256 Am Pdt Wed Aug 21 2019
.small craft advisory in effect from noon pdt today through this evening...
Today..S winds 5 to 10 kt, becoming sw 10 to 20 kt with gusts up to 30 kt this afternoon.
Tonight..SW winds 10 to 15 kt with gusts up to 25 kt.
Thu..SW winds 10 to 15 kt.
Thu night..SW winds 15 to 20 kt with gusts up to 25 kt.
Fri..SW winds 15 to 20 kt with gusts up to 25 kt.
Fri night..SW winds 10 to 15 kt.
Sat..SW winds 15 to 20 kt.
Sun..SW winds 15 to 20 kt.
PZZ500 256 Am Pdt Wed Aug 21 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light to moderate northwest winds will persist across the coastal waters through mid-week as high pressure sits over the eastern pacific and low pressure develops over central california. Locally gusty coastal jets are forecast south of point arena, pigeon point, and point sur that will create hazardous seas conditions for smaller vessels. Breezy afternoon and evening winds are also forecast over the san francisco bay as well as over the Monterey bay. Mixed seas will continue with shorter period northwest waves at around 8 to 10 seconds, a light longer period west swell, and a light southerly swell.


7 Day Forecast for Marine Location Near Milpitas, CA
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location: 37.44, -121.91     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 211053
afdmtr
area forecast discussion
national weather service san francisco bay area
353 am pdt Wed aug 21 2019

Synopsis High pressure over central and southern california
will kick off a warming trend through Thursday and will compress
the marine layer along the coast leading to significantly less
night and morning low clouds. Seasonable temperatures are forecast
through the upcoming weekend, along with continued dry conditions.

Discussion As of 3:53 am pdt Wednesday... An interesting
weather pattern is currently in place over the west coast with
california nuzzled between a ridge of high pressure to the east
and a ridge of high pressure to the west while a trough of low
pressure passes through the region. High pressure at the surface
presently centered over the four-corners region compressed the
marine layer along the coast resulted in little to no marine layer
overnight. Currently only a few patches of stratus are visible by
satellite over the coastal waters and locally inland over coastal
hills and peaks. Gradients have seen little change overnight with
the northerly gradients remaining around 3 mb while the onshore
gradient from sfo to wmc weakened slightly to around 2 mb.

Model guidance continues to depict a warming trend through
Thursday before temperatures plateau maintaining seasonably warm
temperatures across the region through the remainder of the week
and through the weekend. 500 mb temperatures will warm to around
22 c by this afternoon then cool on Thursday in response to the
trough aloft. However strong ridging at the surface appears to
counteract any cooling resulting in relatively little change
through the rest of the forecast period. Mostly clear skies will
also aid this warming trend to get off to an earlier start today
and Thursday.

Prev discussion As of 9:53 pm pdt Tuesday... The boundary layer
winds will turn more northerly on weds which will induce some
adiabatic warming. Model guidance suggests many of the north and
east bay valleys will warm into the upper 80s and lower 90s on
weds which will be as much as 10 degrees warmer than what was
observed on Tuesday.

One item to watch on weds night is some potentially gusty
northerly winds in the hills. 00z NAM has 20-30 kt winds at 925 mb
(around 2500 feet) from sonoma to monterey late weds afternoon
into weds night. Not expecting any wind advisories but could be a
brief fire weather concern.

Pattern looks to continue with above normal warming trend for
inland areas Thursday and Friday as the ridge builds over the
region with potential for the thermal trough to straddle the coast
at times keeping marine stratus to a minimum. Long range trends
remain warm and dry. Will be watching the tropical activity as it
heads north from baja next week. Current ECMWF would bring
remnants of our coast by about next Thursday... A long ways off.

Aviation As of 10:45 pm pdt Tuesday... Ft ord profiler shows a
marine layer developing at around 1000 feet as the airmass aloft
warms. This is in response to an upper level ridge over the
southwest expanding westward into california. Stratus has been
slow to develop tonight as a light northerly flow has developed
over the area. There is a small area inside the bay which could
spread out into oak and sfo. Still expecting stratus to reform
along the coast later tonight with the marine layer but confidence
is not high as the northerly flow could keep clouds reduced. The
northerly flow will increase on Thursday so there is less of a
chance for stratus Wednesday night.

Vicinity of ksfo... MVFR CIGS after 12z with bases around 1500 ft
possibly as low as 1000 ft. Confidence is not high as it could
stayVFR. Any CIGS will clear out by 17z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR ifr CIGS after 12z clearing after
17z.

Marine As of 2:56 am pdt Wednesday... .Light to moderate
northwest winds will persist across the coastal waters through
mid-week as high pressure sits over the eastern pacific and low
pressure develops over central california. Locally gusty coastal
jets are forecast south of point arena, pigeon point, and point
sur that will create hazardous seas conditions for smaller
vessels. Breezy afternoon and evening winds are also forecast over
the san francisco bay as well as over the monterey bay. Mixed
seas will continue with shorter period northwest waves at around
8 to 10 seconds, a light longer period west swell, and a light
southerly swell.

Mtr watches warnings advisories
Tngt Sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pt reyes 0-10 nm
public forecast: cw
aviation: W pi
marine: st
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 17 mi47 min S 1.9 G 1.9 61°F 74°F1015.8 hPa (-0.5)
AAMC1 - 9414750 - Alameda, CA 31 mi53 min SW 9.9 G 12 61°F 70°F1015.6 hPa
LNDC1 31 mi47 min SW 5.1 G 8 61°F 1015 hPa (-0.4)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 33 mi47 min SW 8.9 G 11
OKXC1 - 9414776 - Oakland (Berth 34), CA 34 mi47 min SW 4.1 G 6 61°F 1015 hPa (-0.3)
OBXC1 34 mi47 min 61°F 59°F
PXSC1 36 mi47 min 61°F 57°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 36 mi47 min S 1 G 2.9 61°F 1014 hPa (-0.3)
FTPC1 - 9414290 - San Francisco, CA 39 mi53 min WNW 2.9 G 5.1 59°F 62°F1015.2 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 40 mi47 min S 5.1 G 7 63°F 1015.3 hPa (-0.3)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 41 mi47 min WNW 11 G 13 67°F 1013 hPa (-0.4)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 42 mi102 min WSW 5.1 59°F 1015 hPa
RCMC1 - 9414863 - Richmond, CA 43 mi53 min S 5.1 G 8 61°F 66°F1014.8 hPa
UPBC1 43 mi47 min WNW 6 G 8
PCOC1 - 9415144 - Port Chicago, CA 43 mi47 min SSW 5.1 G 9.9 62°F 71°F1014.1 hPa (-0.3)
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi47 min W 6 G 8 65°F 71°F1014.3 hPa (-0.4)
ELXC1 - Elkhorn Slough Reserve, CA 44 mi62 min Calm 56°F 1014 hPa55°F
46237 - San Francisco Bar, CA (142) 45 mi47 min 61°F4 ft
MLSC1 - Moss Landing, South Harbor, CA 45 mi53 min ESE 2.9 G 8 56°F 1015.7 hPa56°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 47 mi47 min SW 8 G 8.9 63°F 1014.2 hPa (-0.0)
46092 - MBM1 48 mi97 min NW 12 59°F 58°F1014.9 hPa (-0.7)

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose, San Jose International Airport, CA5 mi54 minN 010.00 miFair60°F57°F90%1015.2 hPa
Mountain View, Moffett Field, CA7 mi51 minN 010.00 miFair61°F53°F75%1015.7 hPa
Hayward, Hayward Air Terminal, CA19 mi53 minW 510.00 miFair61°F55°F81%1016 hPa
Livermore, Livermore Municipal Airport, CA19 mi54 minN 010.00 miFair58°F55°F90%1014.7 hPa
Oakland, Metro Oakland International Airport, CA24 mi54 minENE 310.00 miA Few Clouds59°F53°F81%1015.1 hPa

Link to 5 minute data for KSJC

Wind History from SJC (wind in knots)
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Last 24hrNW4NW6W5NW7W5N5N54N13
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G23
----------------SW3Calm
1 day ago--35--SE4SE4--Calm--N8NW10NW13NW14N14N14----------N5NW7NW5NW6
2 days ago------SE12SE13SE12SE12S12SE12S13S13S13S15S12S11S9S7S9--SE7--------

Tide / Current Tables for Coyote Creek, Tributary #1, San Francisco Bay, California
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Coyote Creek
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Wed -- 12:26 AM PDT     1.65 feet Low Tide
Wed -- 05:08 AM PDT     6.98 feet High Tide
Wed -- 06:28 AM PDT     Sunrise
Wed -- 12:03 PM PDT     Moonset
Wed -- 12:19 PM PDT     1.42 feet Low Tide
Wed -- 05:40 PM PDT     7.94 feet High Tide
Wed -- 07:52 PM PDT     Sunset
Wed -- 11:20 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.71.934.76.276.86.25.13.92.71.91.41.72.84.66.47.77.97.56.55.33.92.7

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
Wed -- 02:22 AM PDT     0.89 knots Max Flood
Wed -- 05:25 AM PDT     -0.00 knots Slack
Wed -- 06:29 AM PDT     Sunrise
Wed -- 09:44 AM PDT     -0.83 knots Max Ebb
Wed -- 11:41 AM PDT     0.00 knots Slack
Wed -- 12:04 PM PDT     Moonset
Wed -- 02:36 PM PDT     0.96 knots Max Flood
Wed -- 05:41 PM PDT     -0.00 knots Slack
Wed -- 07:52 PM PDT     Sunset
Wed -- 10:14 PM PDT     -0.97 knots Max Ebb
Wed -- 11:20 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.60.90.80.60.2-0.1-0.4-0.6-0.8-0.8-0.40.10.60.90.90.70.3-0.1-0.4-0.6-0.9-1-0.8

Weather Map and Satellite Images
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wmap_P
GOES 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.
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Wind Forecast for San Francisco/Monterey Bay Area, CA (7,2,3,4)
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Ground Weather Radar Station San Francisco Bay Area, CA
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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.