Saturday, August24, 2019 L-36.com


Marine Weather and Tides
Colma, CA

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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 6:31AMSunset 7:52PM Saturday August 24, 2019 5:59 PM PDT (00:59 UTC) Moonrise 12:00AMMoonset 2:09PM Illumination 30% Phase: Waning Crescent; Moon at 24 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- 238 Pm Pdt Sat Aug 24 2019
Tonight..SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight.
Sun..SW winds 10 to 15 kt with gusts up to 25 kt.
Sun night..SW winds 10 to 15 kt.
Mon..SW winds 10 to 15 kt with gusts up to 25 kt.
Mon night..SW winds 10 to 15 kt.
Tue..SW winds 10 to 15 kt.
Tue night..SW winds 10 to 15 kt.
Wed..SW winds 10 to 15 kt.
Thu..SW winds 10 to 15 kt.
PZZ500 238 Pm Pdt Sat Aug 24 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northerly winds will persist over the northern outer waters while light southwesterly winds will develop elsewhere through the weekend. Steep, short period northwesterly swell will continue to decrease through the weekend with periods becoming 8 seconds. Moderate period southerly swell will increase to 2 to 3 feet on Sunday and persist through early next week with light to moderate period northwesterly swell continuing through the period.


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 242337
afdmtr
area forecast discussion
national weather service san francisco bay area
437 pm pdt Sat aug 24 2019

Synopsis High pressure will bring a fairly seasonable weather
pattern to the bay area this weekend into early next week. The
marine layer will persist along the coast along with onshore flow
keeping temperatures warm near the coast and bays. Inland
temperatures will trend hotter as the strong high pressure builds.

Remnants of tropical storm ivo will pass offshore Tuesday and
Wednesday with increasing clouds and higher humidity developing.

Discussion As of 2:31 pm pdt Saturday... After an overcast
morning for many, goes-west visible imagery reveals mostly clear
skies for most land areas throughout the region this afternoon.

Locations along the immediate pacific coast are still experiencing
cloudiness, including coastal sonoma and marin counties, parts of
san francisco, coastal san mateo and points south through
monterey county. 1-minute imagery shows the low clouds pushing
through the golden gate from alcatraz to treasure island as the
onshore gradients from san franciso to sacramento are around 2
millibars.

A broad 594 dm ridge at 500 mb located off the california coast
continues to be the main synoptic feature for our area. This
morning's 12z upper air sounding at oakland measured the 500 mb
height at 593 dm, ranking climatologically for this day in the
99th percentile. Ordinarily this would start to raise concerns
about excessive heat; however, the temperature at 850 mb was only
21.4 deg c, ranking around the 75th percentile climatologically.

For comparison, earlier in august when much of the interior
recorded highs near or above 100 deg f, 850 mb temperatures were
in the 24-25 deg c range. These "cooler" temperatures at the low
levels combined with onshore flow will together prevent widespread
upper 90s to 100s from becoming realized for the interior. Highs
will instead warm to the 80s and some 90s this afternoon,
particularly in the region's hottest areas. Temperatures along the
immediate coast will hold in the upper 60s to 70s. Compared to
yesterday, high temperatures will likely be a few or several
degrees cooler.

Over the rest of the weekend and into early next week, 850 mb
temperatures are forecast to gradually warm as the ridge remains
just off the california coast. We'll likely see the marine layer
compress as well, which will generally prevent widespread the
inland intrusion of the morning stratus. Inland temperatures are
expected to warm day-to-day with widespread 90s more likely by
Monday. Locations such as pinnacles national park and the far
north bay near lake berryessa and cloverdale will likely be near
100 degrees. For late august, these values correspond to low to
moderate heat risks. Coastal communities will continue to benefit
from the marine-cooled air with little or no heat impacts
anticipated.

We're continuing to keep a close eye on tropical storm ivo,
presently located about 420 miles west of the southern tip of the
baja peninsula. Ivo is forecast to continue its northward
trajectory over the next several days, weakening as it encounters
cooler waters. Moisture from what will be the remnants of ivo will
advect towards california around the Tuesday-Wednesday timeframe.

Models generally keep the bulk of the moisture off the mainland
for most of Tuesday, but by late Tuesday and into Wednesday, the
latest runs of the ECMWF and GFS bring increased mid upper level
rhs and even some instability closer to home. The tail end of the
latest run of the NAM is beginning to capture our time frame of
interest, and over the next 24 hours, we should be able to get a
better idea with the potential for convection over our area. At a
bare minimum, we should expect increased mid high clouds as the
remnants approach the region. Stay tuned for more details...

Aviation As of 4:37 pm pdt Saturday... It'sVFR all locations
except along the coastline point sur to northern coastal sonoma
county there's almost, not quite, continuous MVFR-ifr CIGS vsbys
in stratus and fog. The 4 pm onshore pressure gradient sfo-sac is
2.4 mb, other directional pressure gradients have relaxed are
closer to balanced since Friday thus the overall wind field at
the surface is lighter today with the usual summer late day sea
breezes. Increasing coverage of MVFR-ifr tonight, conditions most
places nearest the coastline are forecast to lower to ifr
overnight. Conditions then lifting toVFR back to the coastline
late morning to afternoon Sunday.

Vicinity of ksfo...VFR, west wind near 15 knots until 03z. MVFR
cig developing by 14z then back toVFR by 17z Sunday.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR, west winds near 10 knots early in
the evening. Ifr CIGS returning by 03-04z. CIGS Sunday lift toVFR
by late morning.

Marine As of 4:06 pm pdt Saturday... Northerly winds will
persist over the northern outer waters while light southwesterly
winds will develop elsewhere through the weekend. Steep, short
period northwesterly swell will continue to decrease through the
weekend with periods becoming 8 seconds. Moderate period southerly
swell will increase to 2 to 3 feet on Sunday and persist through
early next week with light to moderate period northwesterly swell
continuing through the period.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm from 10 pm
public forecast: rowe
aviation: canepa
marine: sims
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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 mi60 min WSW 5.1 G 11 67°F 1012.9 hPa (-0.9)
PXSC1 9 mi60 min 67°F 60°F
AAMC1 - 9414750 - Alameda, CA 9 mi66 min W 7 G 8.9 67°F 72°F1014.4 hPa
FTPC1 - 9414290 - San Francisco, CA 9 mi66 min WSW 8 G 16 61°F 63°F1014.1 hPa
OBXC1 10 mi60 min 65°F 62°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 10 mi60 min WNW 9.9 G 12 63°F 1013.9 hPa (-0.9)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 10 mi60 min W 8.9 G 9.9
LNDC1 11 mi60 min NNW 6 G 8.9 67°F 1013.8 hPa (-0.9)
46237 - San Francisco Bar, CA (142) 14 mi60 min 61°F4 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 15 mi79 min SSW 8 69°F 1013 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 16 mi60 min S 11 G 14 65°F 1014 hPa (-0.9)
RTYC1 - 9414523 - Redwood City, CA 16 mi60 min NNW 12 G 14 69°F 76°F1014 hPa (-0.9)
RCMC1 - 9414863 - Richmond, CA 17 mi60 min 69°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 23 mi40 min SSW 3.9 G 5.8 60°F 60°F1015.1 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 27 mi60 min WSW 11 G 13 74°F 1012.4 hPa (-0.7)
UPBC1 29 mi66 min W 17 G 20
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi60 min WSW 11 G 14 81°F 74°F1012.3 hPa (-0.8)
PCOC1 - 9415144 - Port Chicago, CA 33 mi60 min W 12 G 15 83°F 72°F1012.3 hPa (-0.8)
PRYC1 - 9415020 - Point Reyes, CA 37 mi60 min 60°F1014.3 hPa (-0.8)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi60 min WNW 14 G 18 86°F 1011.5 hPa (-0.8)
SFXC1 - San Francisco Bay Reserve, CA 42 mi75 min WNW 13 87°F 1012 hPa60°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 mi2.1 hrsWNW 1610.00 miA Few Clouds71°F57°F61%1013.1 hPa
Oakland, Metro Oakland International Airport, CA11 mi2.1 hrsWNW 1310.00 miA Few Clouds73°F59°F62%1013.8 hPa
Half Moon Bay Airport, CA12 mi85 minSSW 57.00 miMostly Cloudy63°F59°F88%1014.9 hPa
San Carlos Airport, CA14 mi2.2 hrsNNW 910.00 miClear73°F59°F61%1013.5 hPa
Hayward, Hayward Air Terminal, CA16 mi2.1 hrsW 1010.00 miFair77°F61°F58%1014.1 hPa
Palo Alto Airport, CA21 mi3.2 hrsNNW 1110.00 miClear73°F60°F65%1013.9 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hr4NW8--------NW5--W3W4W6W6W3SW4NW3NW3NE4N6NW13NW16NW17NW16NW16NW18
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1 day agoW20W20W16----W12NW8----W7W6W8--W8W3NE3N5NE5NE4NE6NE8N5N6SW15
2 days agoW26
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W16----W8--W10W9NW8NW7NW8N6NW10NW18W22W19W21W20

Tide / Current Tables for Oyster Point Marina, San Francisco Bay, California (2)
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Oyster Point Marina
Click for Map
Sat -- 12:32 AM PDT     Moonrise
Sat -- 01:59 AM PDT     1.11 feet Low Tide
Sat -- 06:32 AM PDT     Sunrise
Sat -- 08:27 AM PDT     4.91 feet High Tide
Sat -- 01:52 PM PDT     3.21 feet Low Tide
Sat -- 03:08 PM PDT     Moonset
Sat -- 07:49 PM PDT     6.87 feet High Tide
Sat -- 07:50 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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21.31.11.422.93.84.54.94.94.64.13.73.33.23.54.1566.76.96.45.54.2

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
Sat -- 12:32 AM PDT     Moonrise
Sat -- 02:04 AM PDT     0.00 knots Slack
Sat -- 05:03 AM PDT     0.63 knots Max Flood
Sat -- 06:32 AM PDT     Sunrise
Sat -- 08:35 AM PDT     -0.00 knots Slack
Sat -- 10:57 AM PDT     -0.49 knots Max Ebb
Sat -- 01:28 PM PDT     0.00 knots Slack
Sat -- 03:08 PM PDT     Moonset
Sat -- 04:49 PM PDT     0.55 knots Max Flood
Sat -- 07:44 PM PDT     -0.00 knots Slack
Sat -- 07:50 PM PDT     Sunset
Sat -- 11:26 PM PDT     -1.09 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.7-0.4-00.30.50.60.60.40.2-0.1-0.4-0.5-0.3-0.10.10.30.50.50.40.2-0.1-0.5-0.8-1.1

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 (20,4,5,8)
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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.