Wednesday, August21, 2019 L-36.com


Marine Weather and Tides
San Mateo, CA

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7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
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Sunrise 6:29AMSunset 7:55PM Wednesday August 21, 2019 12:50 PM PDT (19:50 UTC) Moonrise 10:21PMMoonset 11:05AM Illumination 63% 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- 839 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 839 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 San Mateo, CA
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location: 37.59, -122.31     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 211737
afdmtr
area forecast discussion
national weather service san francisco bay area
1037 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 09:10 am pdt Wednesday... The marine layer
struggled overnight and into this morning -- bringing clear to
mostly sunny conditions to most regions. A combination of being
partially mixed by a trough to the north and compressed by a
retrograding ridge aloft and to the south has kept marine stratus
mostly in check this morning. Satellite imagery shows mostly clear
skies across the sf bay area while the remnants of the compressed
marine layer otter eddy are bringing some low clouds to the
salinas valley and lip of the monterey bay.

For today and the coming days, a modest warming trend is forecast in
response to a retrograding ridge. Seasonal temperatures are expected
near the coast while inland areas could rise to 3 to 8 degrees above
normal. Coastal highs in the upper 60s to mid 70s are expected,
while areas in proximity to shorelines will rise to the upper 70s to
mid 80s. Extreme inland areas, such as the north east bay valleys,
southern santa clara valley, and inland monterey san benito counties
are forecast to hit the upper 80s to mid 90s. Some passing high
clouds are expected through the day, increasing the farther
northward you are and through the course of the day, as a
consequence of the low pressure trough digging southward later today
and into tonight. These high clouds could suppress temperatures in
the north bay by a few degrees which they will make up tomorrow.

Tomorrow will be similar to day but with less overall trough
influence -- fewer clouds, a compressed marine layer, and slightly
warmer temperatures inland, particularly for the extreme north
bay that will be under some cloud cover today.

No significant change is planned for the overnight forecast
package. Please see previous discussion for more detail on the
current forecast. Main forecast challenge of the day will be what
impacts, if any, we may see as the moist, unstable remnants of a
tropical depression potentially move over the area mid week next
week.

Previous 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. 850 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 10:37 am pdt Wednesday... For 18z tafs...

vfr expected today. Patchy low clouds persist over the monterey
bay. Northwest winds this evening will strengthen around 2000
feet agl creating some potential for low level wind shear but
magnitude too low to include in tafs at this time. These winds are
also likely to keep stratus development tonight reduced.

Vicinity of ksfo...VFR. West winds increasing after 21z to around
20kt with gusts near 30kt expected.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR today. Onshore winds 10-15 kt this
afternoon. Patchy ifr MVFR CIGS returning overnight tonight.

Marine As of 8:39 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
Tday Sca... Sf bay from 12 pm
sca... Mry bay from 12 pm
sca... Pigeon pt to pt pinos 0-10 nm from 12 pm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm from 12 pm
public forecast: drp
aviation: sims
marine: sims
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 8 mi51 min NNE 5.1 G 8 70°F 74°F1015.4 hPa (-1.1)
AAMC1 - 9414750 - Alameda, CA 13 mi57 min S 1.9 G 2.9 67°F 69°F1015.6 hPa
LNDC1 14 mi51 min WSW 4.1 G 6 69°F 1015 hPa (-0.6)
OBXC1 15 mi51 min 67°F 61°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 15 mi51 min WNW 4.1 G 5.1 68°F 1015 hPa (-0.7)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 15 mi57 min WSW 4.1 G 5.1
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi51 min N 1.9 G 2.9 65°F 1014.2 hPa (-0.4)
PXSC1 15 mi63 min 66°F 61°F
FTPC1 - 9414290 - San Francisco, CA 17 mi57 min WSW 7 G 11 65°F 64°F1015.6 hPa
46237 - San Francisco Bar, CA (142) 22 mi51 min 64°F3 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 22 mi51 min SW 11 G 13 66°F 1015.4 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 22 mi52 min SSE 8 67°F 1015 hPa
RCMC1 - 9414863 - Richmond, CA 24 mi51 min 66°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 30 mi31 min WNW 12 G 16 60°F 59°F1015.8 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 32 mi51 min W 5.1 G 7 73°F 1014.4 hPa (-0.7)
MZXC1 - 9415102 - Martinez-Amorco CA 32 mi57 min NW 13 G 15 74°F 72°F1014.1 hPa
UPBC1 33 mi51 min WNW 13 G 15
PCOC1 - 9415144 - Port Chicago, CA 35 mi51 min W 11 G 12 75°F 72°F1014.1 hPa (-1.0)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi57 min NW 11 G 15 76°F 1013.5 hPa
SFXC1 - San Francisco Bay Reserve, CA 45 mi66 min W 7 80°F 1014 hPa61°F
PRYC1 - 9415020 - Point Reyes, CA 45 mi51 min 59°F1015.7 hPa (+0.0)

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA3 mi1.9 hrsNW 910.00 miA Few Clouds73°F55°F53%1015.2 hPa
San Carlos Airport, CA5 mi2.1 hrsVar 510.00 miClear70°F59°F69%1015.9 hPa
Oakland, Metro Oakland International Airport, CA9 mi2 hrsSW 310.00 miA Few Clouds69°F57°F66%1015.5 hPa
Hayward, Hayward Air Terminal, CA11 mi1.9 hrsWSW 510.00 miFair71°F57°F61%1016.1 hPa
Half Moon Bay Airport, CA11 mi76 minNW 1010.00 miFair64°F57°F78%1016.3 hPa
Palo Alto Airport, CA13 mi2.1 hrsVar 410.00 miClear68°F57°F69%1015.6 hPa
Mountain View, Moffett Field, CA18 mi1.9 hrsVar 410.00 miFair74°F57°F56%1015.7 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Tide / Current Tables for Coyote Point Marina, San Francisco Bay, California
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Coyote Point Marina
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Wed -- 04:27 AM PDT     5.77 feet High Tide
Wed -- 06:30 AM PDT     Sunrise
Wed -- 10:24 AM PDT     1.67 feet Low Tide
Wed -- 12:05 PM PDT     Moonset
Wed -- 04:44 PM PDT     6.87 feet High Tide
Wed -- 07:54 PM PDT     Sunset
Wed -- 11:21 PM PDT     Moonrise
Wed -- 11:23 PM PDT     1.90 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.63.54.55.35.75.75.24.23.12.21.71.82.43.54.966.76.86.45.54.33.12.31.9

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
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Wed -- 02:31 AM PDT     1.11 knots Max Flood
Wed -- 05:50 AM PDT     -0.00 knots Slack
Wed -- 06:29 AM PDT     Sunrise
Wed -- 09:03 AM PDT     -1.11 knots Max Ebb
Wed -- 11:43 AM PDT     0.00 knots Slack
Wed -- 12:05 PM PDT     Moonset
Wed -- 02:45 PM PDT     1.20 knots Max Flood
Wed -- 06:06 PM PDT     -0.00 knots Slack
Wed -- 07:53 PM PDT     Sunset
Wed -- 09:33 PM PDT     -1.29 knots Max Ebb
Wed -- 11:21 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.61.11.10.80.4-0.1-0.5-0.9-1.1-0.9-0.40.10.71.11.210.60.1-0.4-0.9-1.2-1.2-0.8

Weather Map and Satellite Images
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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 (15,3,4,5)
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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.