Wednesday, August21, 2019 L-36.com


Marine Weather and Tides
El Granada, 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 6:29AMSunset 7:56PM Wednesday August 21, 2019 4:08 AM PDT (11:08 UTC) Moonrise 10:22PMMoonset 11:06AM 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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PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 256 Am Pdt Wed Aug 21 2019
.small craft advisory in effect from noon pdt today through late tonight...
Today..NW winds 15 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. W swell 2 to 4 ft at 11 seconds.
Tonight..NW winds 15 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 4 to 6 ft at 13 seconds.
Thu..NW winds 15 to 20 kt with gusts up to 25 kt. W swell 5 to 7 ft at 11 seconds and sw around 2 ft at 20 seconds.
Thu night..W winds 15 to 20 kt. W swell 6 to 8 ft at 10 seconds and sw around 2 ft at 18 seconds.
Fri..S winds 10 to 15 kt. W swell 5 to 7 ft at 10 seconds and sw around 2 ft at 18 seconds.
Fri night..S winds 5 to 10 kt. W swell 3 to 5 ft at 10 seconds and sw around 2 ft at 16 seconds.
Sat..W winds 5 to 10 kt. Wind waves 2 to 3 ft. W swell 2 to 4 ft and sw around 2 ft.
Sun..NW winds 5 to 10 kt. Wind waves 2 to 3 ft. W swell 2 to 3 ft and sw around 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 2 to 4 ft with a dominant period of 10 seconds. Across the bar...seas 3 to 5 ft with a dominant period of 10 seconds. Maximum ebb current of 1.6 kt at 09:07 am Wednesday and 2.1 kt at 09:07 pm Wednesday.
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 El Granada, CA
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location: 37.5, -122.48     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 14 mi51 min W 1.9 G 4.1 62°F 74°F1016 hPa
AAMC1 - 9414750 - Alameda, CA 21 mi57 min SW 6 G 8 61°F 70°F1015.6 hPa
FTPC1 - 9414290 - San Francisco, CA 21 mi57 min S 1 G 4.1 59°F 62°F1015.2 hPa
46237 - San Francisco Bar, CA (142) 21 mi39 min 61°F4 ft
PXOC1 - 9414311 - San Francisco (Pier 1), CA 21 mi51 min SW 1.9 G 1.9 61°F 1014.1 hPa
PXSC1 21 mi51 min 61°F 57°F
OBXC1 22 mi51 min 61°F 59°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 22 mi57 min SSW 4.1 G 6
LNDC1 23 mi51 min SSW 6 G 8 61°F 1015 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 23 mi51 min S 2.9 G 4.1 61°F 1015 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 26 mi29 min NW 12 G 16 59°F 57°F1015.7 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi64 min WSW 5.1 59°F 1015 hPa
RCMC1 - 9414863 - Richmond, CA 29 mi51 min 66°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi51 min SSW 6 G 8 62°F 1015.3 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 40 mi51 min SW 6 G 8 64°F 1014.2 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 41 mi57 min SSW 4.1 G 7 65°F 72°F1014.6 hPa
UPBC1 42 mi51 min W 4.1 G 5.1
PRYC1 - 9415020 - Point Reyes, CA 43 mi57 min 60°F1015.2 hPa
PCOC1 - 9415144 - Port Chicago, CA 45 mi57 min SSW 8 G 15 62°F 71°F1014.4 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 49 mi57 min WNW 11 G 16 66°F 1013.3 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA1 mi69 minN 010.00 miFair50°F50°F100%1016.3 hPa
San Francisco, San Francisco International Airport, CA10 mi73 minW 1010.00 miA Few Clouds63°F53°F70%1015.1 hPa
Oakland, Metro Oakland International Airport, CA20 mi76 minWNW 510.00 miA Few Clouds61°F55°F84%1015.3 hPa
Hayward, Hayward Air Terminal, CA22 mi75 minSW 310.00 miFair62°F55°F80%1016.1 hPa
Mountain View, Moffett Field, CA23 mi73 minN 010.00 miFair62°F54°F75%1015.8 hPa

Link to 5 minute data for KHAF

Wind History from HAF (wind in knots)
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Last 24hrNW3CalmNW4NW5NW4NW4W5NW6NW5NW11NW9
G14
NW8NW9NW10NW10------CalmCalmNE3--CalmCalm
1 day agoSE4S3SE3SE4S4S4S4S4S8S9S8SW5SW5SW4SW4SW3W4CalmCalmCalmCalmCalmCalmCalm
2 days agoS13S15S14S10
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SW6S9S9S8--S11S8--SW5W5S3

Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
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Wed -- 02:41 AM PDT     4.08 feet High Tide
Wed -- 06:30 AM PDT     Sunrise
Wed -- 08:44 AM PDT     1.72 feet Low Tide
Wed -- 12:06 PM PDT     Moonset
Wed -- 03:13 PM PDT     5.04 feet High Tide
Wed -- 07:54 PM PDT     Sunset
Wed -- 09:48 PM PDT     1.74 feet Low Tide
Wed -- 11:22 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.13.744.13.83.32.72.21.81.722.63.34.14.754.94.53.72.92.31.81.72

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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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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Other links: Northern Pacific     Contential US     Full GOES-East
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.