Sunday, July22, 2018 L-36.com


Marine Weather and Tides
Colma, CA

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What's New / NOTES
7/21/2018 Trying to make page Mobile Friendly

Sunrise 6:04AMSunset 8:27PM Sunday July 22, 2018 12:03 AM PDT (07:03 UTC) Moonrise 3:25PMMoonset 1:13AM Illumination 69% Phase: Waxing Gibbous; Moon at 9 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 854 Pm Pdt Sat Jul 21 2018
Tonight..W winds 10 to 20 kt...becoming nw up to 10 kt after midnight.
Sun..NW winds 10 to 20 kt with gusts up to 25 kt.
Sun night..W winds 5 to 15 kt.
Mon..W winds 10 to 20 kt with gusts up to 30 kt.
Mon night..W winds 10 to 20 kt with gusts up to 30 kt.
Tue..W winds 10 to 20 kt with gusts up to 30 kt.
Tue night..W winds 10 to 20 kt with gusts up to 30 kt.
Wed..W winds 5 to 15 kt.
Thu..W winds 5 to 15 kt.
PZZ500 854 Pm Pdt Sat Jul 21 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Mostly light winds are forecast to persist across the coastal waters through the remainder of the weekend. Northwesterly winds are then forecast to increase through much of the coming week. Two long period southerly swells will impact the region this weekend and early next week.

7 Day Forecast for Marine Location Near Colma, CA
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location: 37.68, -122.42     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 220538
afdmtr
area forecast discussion
national weather service san francisco bay area
1038 pm pdt Sat jul 21 2018

Synopsis Seasonable conditions will remain in place through
Monday. High pressure will build over the region for the middle
part of the week bringing hot temperatures to interior areas and
in the mountains.

Discussion As of 8:59 pm pdt Saturday... It was another warm,
but seasonal july day across the bay area, with observed high
temperatures ranging from the upper 60s lower 70s along the coast
to mid-upper 90s inland. Today's hot spot was at bradley, in
southern monterey county, with the raws hitting 101f at that
location. Expect very similar temperatures across the bay area on
Sunday. Tonight's 00z oak sounding continues to show the presence
of monsoonal moisture in the air, recording a pw value of 1.61",

06" shy of tying the daily MAX record the presence of this
moisture will keep low temperatures about 5 degrees above seasonal
normal tonight.

Visible satellite imagery shows almost a carbon copy of what was
occurring this time yesterday, with stratus low clouds hugging the
entire immediate coastline between sonoma county and monterey
county. And similar to last night, expect this stratus to push
inland into the adjacent valleys through sunrise Sunday.

No major changes were made to the forecast since this afternoon's
package. A heat advisory remains in effect between noon pdt
Tuesday and 9 pm pdt Wednesday for the following areas: east bay
hills, southern salinas valley, los padres national forest, santa
lucia mountains, and interior monterey san benito counties.

The previous discussion remains valid and is included below.

Prev discussion As of 01:57 pm pdt Saturday... A few clouds continue
to stream over the bay area and monterey bay regions this
afternoon as seen on visible satellite, while day time high temps
continue to warm to seasonable norms. Sunday and Monday will
continue to reflect normal july conditions with low clouds and fog
along the coast overnight and near normal temps across the region
each day. Monsoonal moistures remains to our east, mainly
impacting the sierras.

The area of forecast for this afternoons forecast package is the
heat that will creep into the area Tuesday through Thursday. 500
mb high pressure over the 4 corners region will drift to the west
the next couple days, then set up shop near the ca az border. As
it makes the shift the high pressure will strengthen to near 599
dam, ridging into the bay area region and causing subsidence in
the air column. As this pattern sets up looking for a quick heat
up on Tuesday and remaining into Thursday. Since our area of
responsibility will be on the edge of the heat dome, the main
areas of focus will be for the SE portion of monterey county, most
of san benito county, and the eastern portion of santa clara
county. It will also cook for the far NE portion of napa county
Tuesday and Wednesday. Onshore flow is expected to remain in place
and keep the remainder of the bay area only a little above
seasonal averages. We will be watching how the winds are shaping
up over the coming days. If the winds calm on Tuesday Wednesday
afternoon, effectively eliminating the onshore push, temps could
ramp up in the bay area core. Models are not indicating this
currently, but bears watching. With this synoptic scale pattern
change coming and the ridge bringing in 850 mb temps around 25c,
we went ahead and took the preemptive step of issuing a heat
advisory with significant lead time. The heat advisory will start
around 11 am on Tuesday and run through Wednesday at 9 pm. Due to
the warm airmass aloft, the overnight lows in the hills and
mountains will be rather high, likely in the 70s and low 80s.

Valleys will dip into the 50s and 60s, so the heat recovery
overnight will be for lower elevations. This is why the heat
advisory covers mainly elevated terrain. If models hold true, the
heat advisory may need to be extended into Thursday, as it looks
much like the setup taking place on Tuesday.

Friday will bring a noticeable change as the dome of high
pressure is forecast to shift to the east again due to low
pressure moving into the pac nw. This pattern will help to shift
the heat out and bring the region back into seasonable norms.

Overall... Typical july conditions Sunday Monday followed by an
interior heat up Tuesday through Thursday with a week punctuated
by a return to seasonal norms.

Aviation As of 10:40 pm pdt Saturday... For 06z tafs.

Conditions tonight similar to last night except slightly earlier
development of low ceilings at koak. Ifr ceilings likely to
develop at ksts by around 07z. Ksjc and klvk expected to remain
vfr overnight. Most difficult forecast is once again for ksfo
where low ceilings may develop, but most likely not until 12z.

Otherwise, expect clearing on Sunday to occur by 17z in most areas
with earlier return of low clouds likely on Sunday evening. Light
to moderate onshore winds.

Vicinity of ksfo...VFR for most of period. Ifr ceilings may
develop between 12-16z but confidence is rather low. West winds
between 15-20 knots late afternoon and evening hours, otherwise
light winds.

Sfo bridge approach... Similar to sfo.

Monterey bay terminals... Ifr ceilings continuing through 17z
Sunday with occasional MVFR visibility. Early return of ifr
conditions on Sunday evening, likely by 00z. Light winds.

Marine As of 8:54 pm pdt Saturday... Mostly light winds are
forecast to persist across the coastal waters through the
remainder of the weekend. Northwesterly winds are then forecast to
increase through much of the coming week. Two long period
southerly swells will impact the region this weekend and early
next week.

Mtr watches warnings advisories
Tngt None.

Public forecast: bam bfg
aviation: dykema
marine: dykema
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PXOC1 - 9414311 - San Francisco (Pier 1), CA 8 mi34 min W 2.9 G 8.9 1016.7 hPa
FTPC1 - 9414290 - San Francisco, CA 9 mi40 min W 7 G 14 60°F 61°F1017.8 hPa
PXSC1 9 mi40 min 62°F 61°F
AAMC1 - 9414750 - Alameda, CA 9 mi40 min WNW 4.1 G 5.1 62°F 70°F1017.8 hPa
OBXC1 10 mi34 min 61°F 61°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 10 mi40 min W 7 G 8.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 10 mi34 min W 8 G 11 61°F 1017.7 hPa
LNDC1 11 mi34 min WNW 4.1 G 6 62°F 1017.6 hPa
46237 - San Francisco Bar, CA (142) 14 mi64 min 60°F4 ft
RTYC1 - 9414523 - Redwood City, CA 16 mi34 min NW 5.1 G 5.1 76°F1017.8 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 16 mi34 min SW 7 G 8.9 63°F 1017.7 hPa
RCMC1 - 9414863 - Richmond, CA 17 mi40 min WSW 7 G 9.9 61°F 65°F1017.3 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 23 mi24 min SW 3.9 G 3.9 60°F 59°F1018.4 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 27 mi34 min WSW 12 G 14 63°F 1016.7 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi34 min 69°F
PCOC1 - 9415144 - Port Chicago, CA 33 mi34 min WSW 18 G 22 70°F1016.2 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 33 mi74 min SSW 3.9 G 3.9 61°F 61°F6 ft1018.4 hPa (+1.3)
PRYC1 - 9415020 - Point Reyes, CA 37 mi34 min WSW 1 G 2.9 62°F1017.7 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi34 min NW 13 G 20 67°F 1015.3 hPa
SFXC1 - San Francisco Bay Reserve, CA 42 mi79 min W 11 64°F 1016 hPa58°F

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA5 mi68 minW 1110.00 miA Few Clouds62°F57°F84%1017.1 hPa
Oakland, Metro Oakland International Airport, CA11 mi71 minWNW 1010.00 miMostly Cloudy61°F59°F93%1017.4 hPa
Half Moon Bay Airport, CA12 mi64 minN 04.00 miFog/Mist59°F57°F94%1018.6 hPa
San Carlos Airport, CA14 mi64 minNNW 410.00 miFair64°F57°F78%1017.3 hPa
Hayward, Hayward Air Terminal, CA16 mi70 minNNW 710.00 miOvercast64°F57°F81%1018.3 hPa
Palo Alto Airport, CA21 mi3.3 hrsNW 1010.00 miClear72°F62°F73%1016.6 hPa

Wind History from SFO (wind in knots)
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Last 24hrNW10NW8NW7NW7NW7W5NW4NW3CalmNE5N7N8N7NW13NW16W18W21W21W19W14W16W13W16W11
1 day agoNW6W6W6W7W6W5CalmW4CalmNE6N7NE8N8N8N8CalmS8S145NW11NW13NW11NW11NW12
2 days agoW8NW8W8W6W5W4W4S3CalmNE3NE5N7N9N9NW16NW16NW15NW16
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Tide / Current Tables for South San Francisco, San Francisco Bay, California
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South San Francisco
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Sun -- 02:13 AM PDT     Moonset
Sun -- 03:46 AM PDT     0.51 feet Low Tide
Sun -- 06:05 AM PDT     Sunrise
Sun -- 10:16 AM PDT     5.31 feet High Tide
Sun -- 03:09 PM PDT     2.43 feet Low Tide
Sun -- 04:24 PM PDT     Moonrise
Sun -- 08:26 PM PDT     Sunset
Sun -- 09:20 PM PDT     7.28 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
42.51.30.70.50.91.82.83.94.85.35.24.53.62.82.42.63.44.45.66.77.27.16.4

Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current
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Sierra Point 1.3 mi ENE
Click for Map
Sun -- 12:24 AM PDT     -1.07 knots Max Ebb
Sun -- 02:13 AM PDT     Moonset
Sun -- 03:56 AM PDT     0.00 knots Slack
Sun -- 06:05 AM PDT     Sunrise
Sun -- 07:17 AM PDT     0.83 knots Max Flood
Sun -- 10:12 AM PDT     -0.00 knots Slack
Sun -- 01:08 PM PDT     -0.50 knots Max Ebb
Sun -- 03:42 PM PDT     0.00 knots Slack
Sun -- 04:24 PM PDT     Moonrise
Sun -- 06:53 PM PDT     0.70 knots Max Flood
Sun -- 08:26 PM PDT     Sunset
Sun -- 09:39 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.1-1-0.9-0.500.40.70.80.80.50.1-0.3-0.5-0.5-0.5-0.30.10.40.60.70.60.3-0.2-0.7

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 (3,6,7,8)
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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.