Friday, July25, 2014 L-36.com


Marine Weather and Tides
Dillon Beach, CA

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6/17/2014 - I reported slow load times to NOAA and they quickly resolved the problem. Sorry for any inconvience. NOAA had some stuck processes on two servers. This was a problem on 5 to 10% of the requests.
6/10/2014 - Marine Zones updated. Some zones have changed. Edit your Marine Forecast section to check.

Sunrise 6:06AMSunset 8:28PM Friday July 25, 2014 8:56 AM PDT (15:56 UTC) Moonrise 4:12AMMoonset 6:29PM Illumination 2% Phase: Waning Crescent; Moon at 28 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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PZZ540 Point Arena To Point Reyes To 10 Nm- 822 Am Pdt Fri Jul 25 2014
.small craft advisory in effect through Saturday morning...
Today..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 5 to 7 ft at 9 seconds.
Tonight..NW winds 15 to 25 kt. Wind waves 3 to 6 ft. NW swell 3 to 5 ft at 9 seconds.
Sat..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 4 to 6 ft at 8 seconds.
Sat night..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 3 to 5 ft at 8 seconds.
Sun..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 8 seconds. Patchy fog after midnight.
Mon..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft. Patchy fog.
Tue..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 2 to 4 ft. Patchy fog.
PZZ500 822 Am Pdt Fri Jul 25 2014
Synopsis for the central california coast and bays including Monterey bay national marine sanctuaries.. Winds over the coastal waters will decrease today as the surface pressure gradient weakens. Light winds and seas will continue through the weekend except moderate northwest over the northern outer waters.

7 Day Forecast for Marine Location Near Dillon Beach, CA
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location: 38.25, -122.98     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 251138
afdmtr
area forecast discussion
national weather service san francisco bay area
438 am pdt Fri jul 25 2014

Synopsis Warm to hot weather today for most of the bay area as
high pressure builds and a thermal trough persists near the coast.

Some subtle cooling is possible on Saturday... Mainly near the
coast as a stronger seabreeze develops but warm to hot weather
will continue inland. No big changes through early next week as
high pressure continues with dry weather over the bay area and
continued seasonably warm temperatures away from the coast.

Discussion As of 3:15 am pdt Friday... Main weather story for
today will be warm to hot inland temperatures. The northerly
gradient is still 5 mb down the coast with sfo-wmc 3 mb offshore.

The coast is clear of clouds for the most part except some shallow
fog right along the coast. For example half moon bay and monterey
are both reporting 400 foot cloud decks that are forecast to mix
out quickly after sunrise. In general expect temperatures to warm
as much as 4 to 8 degrees above yesterdays readings. Already at
this hour many of the sites up in the hills are running as much as
10 to 20 degrees warmer than last night at this time. This is
occurring as the marine layer has compressed to under 1000 feet
with continued airmass warming and some adiabatic compression as
the thermal trough has shifted closer to the coast. In general not
expecting record highs today but a few sites could get close.

Record highs for late july near the coast are actually quite low
as were often mired under a persistent marine layer and strong
onshore winds. However since the offshore flow is only weak and a
seabreeze is expected believe we'll fall short of records at
places like sf city... Monterey and salinas. Meanwhile inland areas
will be hot with 100 degree heat forecast for the east bay
valleys... Santa clara valley and interior valleys of monterey/san benito.

All MOS data shows today as the peak of the heat with a few
degrees of cooling for Saturday. However for the most part that
may be splitting hairs as another hot day is in store for Saturday
away from the coast. Looking over the model data not seeing any
signs of a southerly wind reversal or anything that would bring
dramatic cooling on Saturday. However there is a subtle ripple in
the flow that shows up in the 500 mb fields off the coast by
Saturday afternoon. This may be just enough to enhance the stratus
field over the ocean. In addition the forecast onshore gradients
from sfo-sac are expected to increase by Saturday and usher in a
stronger seabreeze.

Day to day changes Sunday through Thursday are hard to pin down at
this time. For the most part expect temperatures to run near normal.

We will have to monitor monsoon potential but for now the models
keep any moisture over the sierra and northern mountains of the
state.

Aviation As of 04:30 am pdt Friday... Northerly gradient
continues to be moderate at over 5 mb sfo to acv. Shallow stratus
has formed along the coast affecting the mry bay terminals this
morning. The clouds should burn off fairly early given how thin
they are though the northwesterly component of the wind may help
push more clouds in to either of the terminals. OtherwiseVFR
today.

Vicinity of ksfo...VFR. Light NE winds possible late
morning... Turning west in the afternoon.

Ksfo bridge approach... Similar to ksfo.

Monterey bay area terminals... Ifr this morning. Should burn off by
mid morning however northwesterly flow could lead to later
clearing... Medium to low confidence on clearing time.

Marine As of 3:15 am pdt Friday... Winds over the coastal waters
will decrease today as the surface pressure gradient weakens.

Light winds and seas will continue through the weekend except
moderate northwest over the northern outer waters.

Climate Record high temperatures for Friday july 25th along
with the most recent date it occurred. * signifies there are
additional years the record was set.

Sf bay area

Location Temp/year
kentfield... ... ... ... ... 103/1975
san rafael... ... ... ... .. 98/1975
napa... ... ... ... ... ... ..101/1975
san francisco... ... ... .. 82/1973
sfo airport... ... ... ... . 91/1973
oakland (downtown)... ... 97/1973
oakland airport... ... ... 92/1973
livermore... ... ... ... ... 111/1980
moffett field... ... ... .. 90/2006
san jose... ... ... ... ... . 99/1975
gilroy... ... ... ... ... ... 109/2006
monterey bay area

Location Temp/year
monterey... ... ... ... ... . 83/2006
santa cruz... ... ... ... .. 97/1973
salinas... ... ... ... ... .. 85/1975
salinas airport... ... ... 87/1973
king city... ... ... ... ... 104/1973

Mtr watches/warnings/advisories
Tday Sca... Pt arena to pt reyes 10-60 nm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 10-60 nm
public forecast: rww
aviation/marine: ac
visit us at weather.Gov/sanfrancisco
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 17 mi67 min NNW 16 G 18 57°F 60°F7 ft1011.8 hPa (+1.2)
PRYC1 - 9415020 - Point Reyes, CA 18 mi39 min E 1.9 G 2.9 61°F 60°F1011.7 hPa
46214 - Point Reyes, CA (029) 33 mi61 min 58°F10 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi67 min NNW 3.9 G 3.9 59°F 8 ft
46237 - San Francisco Bar, CA (142) 37 mi45 min 64°F5 ft
RCMC1 - 9414863 - Richmond, CA 38 mi39 min SSW 1.9 G 2.9 65°F 68°F1011.6 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 40 mi39 min S 2.9 G 4.1 66°F 1012 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 40 mi39 min SW 5.1 G 6 66°F 1011.4 hPa
FTPC1 - 9414290 - San Francisco, CA 41 mi39 min WSW 5.1 G 7 63°F 65°F1012.1 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 44 mi39 min NE 1 G 2.9 65°F 1010.8 hPa
PXSC1 44 mi39 min 66°F 59°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 46 mi39 min Calm G 1.9 64°F 1011.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 46 mi39 min WSW 1 G 1.9
OBXC1 46 mi39 min 64°F 59°F
UPBC1 48 mi39 min WNW 6 G 8.9
MZXC1 - 9415102 - Martinez-Amorco CA 48 mi39 min WNW 8 G 8.9 67°F 70°F1011.2 hPa58°F
AAMC1 - 9414750 - Alameda, CA 49 mi39 min WNW 1 G 1.9 67°F 72°F1011.7 hPa
LNDC1 49 mi39 min N 1.9 G 4.1 66°F 1011.8 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Rosa (awos), CA20 mi64 minN 09.00 miFair62°F52°F70%1010.5 hPa
Petaluma Muni, CA20 mi62 minN 06.00 miFair61°F55°F83%1012.2 hPa
Novato/Gnoss Field Airport, CA24 mi62 minN 010.00 miFair63°F53°F73%1011.8 hPa

Wind History from O69 (wind in knots)
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Last 24hrS4SW3CalmW6NW3W10NW9
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NW10NW4NW3CalmCalmCalmCalmCalmCalmCalmNW3CalmN3CalmCalm
1 day agoCalmW5W5SW10W8W8
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W9W6W5NW3NW3NW3NW3NW5NW3CalmCalmCalmCalmCalm
2 days agoCalmW3W4NW6NW5W11
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W7W5NW6NW5NW3CalmCalmNW3W3CalmCalmCalmCalm

Tide / Current Tables for Tomales Bay entrance, California
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Tomales Bay Entrance
Click for Map
Fri -- 05:12 AM PDT     Moonrise
Fri -- 05:48 AM PDT     -0.46 feet Low Tide
Fri -- 06:08 AM PDT     Sunrise
Fri -- 12:28 PM PDT     3.85 feet High Tide
Fri -- 05:20 PM PDT     2.27 feet Low Tide
Fri -- 07:29 PM PDT     Moonset
Fri -- 08:27 PM PDT     Sunset
Fri -- 11:08 PM PDT     5.27 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.83.92.71.50.4-0.3-0.4-0.10.71.72.73.43.83.83.532.62.32.42.83.54.355.3

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Fri -- 02:40 AM PDT     -1.34 knots Max Ebb
Fri -- 05:12 AM PDT     Moonrise
Fri -- 06:09 AM PDT     Sunrise
Fri -- 06:35 AM PDT     0.00 knots Slack
Fri -- 09:46 AM PDT     1.11 knots Max Flood
Fri -- 12:47 PM PDT     -0.00 knots Slack
Fri -- 03:17 PM PDT     -0.67 knots Max Ebb
Fri -- 06:27 PM PDT     0.00 knots Slack
Fri -- 07:29 PM PDT     Moonset
Fri -- 08:27 PM PDT     Sunset
Fri -- 09:17 PM PDT     0.83 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.4-1-1.3-1.3-1.2-0.9-0.40.30.811.10.90.4-0.1-0.5-0.7-0.6-0.5-0.20.30.60.80.80.5

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for San Francisco/Monterey Bay Area, CA (11,2,3,4)
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Ground Weather Radar Station Sacramento, CA
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weather_mapweather_map weather_map

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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.